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datashee t product structure silicon monolithic integrated circuit this product is not designed for pr otection against radioactive rays 1/27 tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.com tsz22111 ? 14 ? 001 22 .jul.2013 rev.001 switching regulator with external fet 3.9 to 30v, 2ch synchronous rectification step-down controller BD9015KV-M bd9016kv-m general description the BD9015KV-M and bd9016kv-m are high perfor- mance synchronous rectificat ion switching controllers with wide input range and dual channel output. the synchronous rectification method comes with high efficiency making controller ideal for eco-designs(low power consumption) of numerous electronics. all channels have enable pins, soft start functionality and power good outputs. startup and shutdown can be controlled independently. an integrated pll circuit can be synchronized to an external 250khz to 600khz clock signal. features n channel mosfet direct drive synchronous rectification for increased efficiency acceptable low esr ceramic capacitor at output integrated pll circuit for external synchronization; 250khz to 600khz current mode control high side mosfet current sensing pre-bias functionality independent on/off control for all channels at max duty the oscillation frequency is slowed down to 1/5, reducing the input/ output voltage difference. low voltage and over voltage detection circuit at all outputs when the over voltage is detec ted, the l-side fet is off (BD9015KV-M). the l-side fet is on (bd9016kv-m). low side fet is on (bd9016kv-m) power good indicator pin (pgood) integrated overcurrent protection with self recovery. key specifications ? input voltage range: 3.9 v to 30 v ? output voltage range: 0.8 v to 10 v ? accurate voltage reference:1.5%(-40c to +105c) ? switching frequency: 250 khz to 550 khz ? shutdown current: 0 a (typ) ? operating temperature r ange: -40c to + 105 c package w (typ) x d (typ) x h (max) vqfp48c 9.00 mm x 9.00 mm x 1.60 mm applications car audio, car navigation lcdtv, pdptv, dvd, pc, etc.. typical application circuit figure 1. typical application circuit vqfp48c 5v/4a bd9015kv/ bd9016kv downloaded from: http:///
datasheet datasheet 2/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 pin configuration (top view) figure 2. pin configuration pin description pin no. symbol function pin no. symbol function 1 boot2 power supply for outh2 driver 25 pgood1 power good output pin 1 2 n.c. not connected 26 n.c. not connected 3 cl2 current detection setting pin 2 27 en1 output 1 on / off pin 4 n.c. not connected 28 en2 output 2 on / off pin 5 vcccl2 power supply for current detection 2 29 n.c. not connected 6 n.c. not connected 30 gnd ground pin 7 vcc power supply pin 31 n.c. not connected 8 vcccl1 power supply for current detection 1 32 n.c. not connected 9 n.c. not connected 33 rt/lpfc oscillation frequency setting / filter connection pin 10 cl1 current detection setting pin 1 34 sel external synchronization select pin 11 n.c. not connected 35 sync external synchronization pulse input pin 12 boot1 power supply for outh1 driver 36 pgood2 power good output pin 2 13 outh1 high side fet gate pin 1 37 n.c. not connected 14 sw1 high side fet source pin 1 38 ss2 soft start time setting pin 2 15 dgnd1 low side fet source pin 1 39 comp2 error amp output 2 16 outl1 low side fet gate pin 1 40 fb2 error amp input 2 17 vreg5a reg input for fet driver pin 41 n.c. not connected 18 n.c. not connected 42 extvcc external power supply input pin 19 n.c. not connected 43 n.c. not connected 20 n.c. not connected 44 vreg5 r eg output for fet driver pin 21 fb1 error amp input 1 45 outl2 low side fet gate pin 2 22 comp1 error amp output 1 46 dgnd2 low side fet source pin 2 23 ss1 soft start time setting pin 1 47 sw2 high side fet source pin 2 24 n.c. not connected 48 outh2 high side fet gate pin 2 downloaded from: http:///
datasheet datasheet 3/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 block diagram figure 3. block diagram 1 downloaded from: http:///
datasheet datasheet 4/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 description of blocks (1) error amplifier the error amplifier compares the output feedback voltage to t he 0.8v reference voltage and provides the comparison result as comp voltage, which is used to determine the switching dut y cycle. as at startup the so ft start is based on the ss pin voltage, the comp voltage is limited to the ss voltage. (2) oscillator an internal fixed current source sets the oscillation frequency with the help of a single resistor connected to the rt pin. the frequency can be set in the range between 250 khz to 550 khz by proper selection of the external resistor. the phase difference between the outputs is 180 to help reduce the input capacitor voltage ripple and power losses. also, in case the input/output voltage difference is small, the oscillation frequency is divided 5times from the set value. thi s increase the maximum duty cycle time and helps to reduce the input to output voltage drop. the maximum duty is determined by the following equation. also above equation is theory value. the maximum duty may be influenced by pcb layout, fet, inductor, etc. verification and confirmation with the actual application is recommended. (3) slope the slope block uses the clock produced by the oscillator to generate a saw-tooth wave and sends this wave to the pwm comparator. (4) pwm comp the pwm comparator determines the switching duty cycle by comparing the error amplifier comp voltage, with the saw-tooth signal from the slope block. the switching duty cycle is limited internally to a fixed maximum duty, and thus cannot become 100 %. (5)driver(drv, sw logic) this block receives the switching duty determined by th e pwm comp block and generates outh and outl signals which drive the external fets. also, the minimum on time of outh is designed 250ns at the minimum and the minimum off time is designed 400ns at the maximum. (6) reference voltage (vreg5) this block generates the internal reference voltage: 5 v. vreg5 requires an external capacitor. the fet driver supply input (vreg5a) also requires a capacitor. a ceramic capacitor with a value of 2 f or more with low esr matching the vreg5 and vreg5a pin is recommended. (7) external synchronization (sync, pll) the internal oscillator circuit can be synchronized with an external signal applied to the sync pin. this is done with the help of an internal pll circuit. in this situation the sel pin must pulled h. after applying a clock to the sync pin and pulling the sel pin h, the internal frequency will synchronize with the applied clock frequency. for synchronization, a clock with a frequency of 250 khz to 600 khz and duty of 20 % to 80 % must be used. note, the sel pin should be set to h before the en pin or it should be set to h after the soft start time. in case of using external synchronization, a lo w pass filter is required for the lpf / rt pin. (8) pgood pin this pin monitors the output vo ltage (fb voltage). if it is within 8.5 % (typ) of the nominal output volt age, pgood output is h. when outside the ra nge of 8.5% the pgood output is pulled l. the pgood pin is an open drain output so a pull up resistor is required when used. (9) overcurrent protection (ocp) the overcurrent protection is activated when the v cccl to cl voltage drop reaches or exceeds 90mv. once activated the outh duty will be limited and the output voltage lowered. (10) short circuit protection (scp) the short circuit protection is activated after the output voltage (fb voltage) drops below 91.5 % and the overcurrent protection is detected 256 times (all sw pulses). also, if the ov ercurrent protection is activat ed in a situation where the fb voltage is equal or less than 0.5 v, this will resemble an out put short and the short circuit protection will be activated. if the short circuit protection is activated, for a period of 1024 cycles of oscillation frequency, the output will be turned o ff and the ss and comp discharged. maximum duty = ( 1 C ( t off f osc ) / 5 ) 100 [%] t off : outh minimum off time (max=400ns) f osc: setting frequency downloaded from: http:///
datasheet datasheet 5/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 (11) overvoltage protection (ovp) BD9015KV-M, if the output voltage (fb voltage) rise s above 108.5 %, outh and outl will turn off. once the output returns to a normal state the chip will recover. however, in case of light load or if recovery takes time, the comp voltage will drop and recovery will be done with the mini mum duty cycle, which may lead to undershoot of the output. in case this undershoot becomes an application proble m, the output capacitor should be increased or the phase compensation rc constant should be adjusted. bd9016kv-m, if the output voltage (fb volta ge) rises above 108.5 %, only outh will turn off. outl continues to turn on and l-side fet will discharge the output capacitance. the on pul se width of outl is determined by pwm comp. if a short to vcc is considered the countermeasures needed ar e described in the operational notes at page 24. (12) under voltage lockout circuit (uvlo) if the vreg5 voltage drops below 3.6 v (typ) the uv lo is activated and the device will shut down. (13) thermal shutdown (tsd) if the chip temperature (tj) reaches or exceeds ca. 150 c the output is turned off. downloaded from: http:///
datasheet datasheet 6/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 absolute maximum ratings (1) pd should not be exceeded. (2) 8.8 mw / c reduction when ta 25 c if mounted on a glass epoxy board of 70 mm 70 mm 1.6 mm recommended operating ratings (ta=25 ) parameter symbol limits unit supply voltage 1 vcc, extvcc 3.9 to 30 (1) v supply voltage 2 vcccl1, 2, v cl1, 2 3 to vcc v boot1,2 sw1,2 voltage v boot1, 2 - sw1, 2 3.2 to vreg5 v output voltage v o 0.8 to 10 v oscillation frequency range f osc 250 to 550 khz synchronous frequency range f sync_in 250 to 600 khz (1) in case of using less than 6v, short vcc, extvcc and vreg5. note, this is the minimum value after 4.5v or higher has been supplied to the supply pin. parameter symbol limits unit vcc voltage vcc -0.3 to +35 (1) v extvcc voltage extvcc -0.3 to +35 (1) v vcccl1, 2 voltage vcccl1, 2 -0.3 to +35 (1) v cl1, 2 voltage v cl1, 2 -0.3 to vcccl1,2 v sw1, 2 voltage v sw1, 2 -1.5 to vcccl1,2 v boot1, 2 voltage v boot1, 2 -0.3 to +40 v boot1, 2 - sw1, 2 voltage v boot1, 2-sw1, 2 -0.3 to +7 v vreg5, 5a voltage vreg5, 5a -0.3 to +7 or extvcc v en1, 2 voltage v en1, 2 -0.3 to extvcc v ss1, 2 voltage v ss1, 2 -0.3 to vreg5 v fb1, 2 voltage v fb1, 2 -0.3 to vreg5 v comp1,2 voltage v comp1, 2 -0.3 to vreg5 v rt/lpfc voltage v rt / lpfc -0.3 to vreg5 v pgood1,2 voltage v pgood1, 2 -0.3 to +7 v sel voltage v sel -0.3 to +7 v sync voltage v sync -0.3 to +7 v power dissipation pd 1.1 (2) w operating temperature range topr -40 to +105 c storage temperature range ts t g -55 to +150 c junction temperature tjmax +150 c downloaded from: http:///
datasheet datasheet 7/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 electrical characteristics (unless otherwise specified: ta=25c, vcc=12v, extvcc=12v, vcccl1, vcccl2=12v, v en1 , v en2 =5v) parameter symbol limits unit conditions min. typ. max. circuit current i cc - 4 10 ma shutdown current i st - 0 1 a v en1 , v en2 = 0 v ta = -40 c to +105 c en pin threshold voltage v enth 1.00 2.15 2.70 v ta = -40 c to +105 c en pin pull down resistor r en 100 200 400 k ? v en1 , v en2 = 5 v vreg5 vreg5 output voltage vreg5 4.7 5.0 5.3 v i vreg5 = 6 ma uvlo uvlo operating voltage v uvlo 3.3 3.6 3.9 v vreg5 sweep down ta = -40 c to 105 c hysteresis voltage v uvlo_hys 200 400 600 mv vreg5 sweep up error amp block fb pin source current i fb 0 0.13 1.00 a v fb1 , v fb2 = 0.8 v ta = -40 c to +105 c reference voltage 1 v ref 1 0.792 0.800 0.808 v fb1, fb2 pin voltage reference voltage 2 v ref 2 0.788 0.800 0.812 v fb1, fb2 pin voltage ta = -40 c to +105 c oscillator block oscillation frequency f osc 270 300 330 khz rt = 200 k ? external synchronous frequency f sync - 500 - khz rt=200 k ? f sync_in = 500 khz ta = -40 c to +105 c sync pin threshold voltage v syncth 0.5 1.8 2.5 v ta = -40 c to +105 c sync pin pull down resistor r sync 125 250 500 k ? v sync = 5 v sel pin threshold voltage v selth 0.5 1.8 2.5 v ta = -40 c to +105 c sel pin pull down resistor r sel 125 250 500 k ? v sel = 5 v lpfc charge current i lpfcc 20 30 40 a v rt / lpfc = 1 v lpfc discharge current i lpfcdc 20 30 40 a v rt / lpfc = 1 v soft start block ss pin charge current i ss 5 10 15 a v ss1 , v ss2 = 1 v ta = -40 c to +105 c ss pin discharge current r ss 0.3 0.5 1.7 k ? v ss1 , v ss2 = 1 v vcc = 3 v maximum voltage v ss_max 2.05 2.25 2.45 v standby voltage v ss_stb 0 0.01 0.10 v vcc = 3 v ta = -40 c to +105 c * this product is not designed to be radiation-resistant. downloaded from: http:///
datasheet datasheet 8/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 electrical characteristics (unless otherwise specified: ta=25c, vcc=12v, extvcc=12v, vcccl1, vcccl2=12v, v en1 , v en2 =5v) parameter symbol limits unit conditions min. typ. max. driver block outh minimum on time t on - 130 - ns outh minimum off time t off - 200 - ns outh outl dead time t dethl - 35 - ns outl outh dead time t detlh - 35 - ns outh high side on resistor r on_hh - 2.5 - ? outh low side on resistor r on_hl - 1.7 - ? outl high side on resistor r on_lh - 2.5 - ? outl low side on resistor r on_ll - 1.1 - ? boot pin current consumption i boot - 1 - ma v boot = 17 v v sw1 , v sw2 = vcccl overcurrent protection block cl pin threshold voltage 1 v cl1 78 90 103 mv cl pin threshold voltage 2 v cl2 75 90 105 mv ta = -40c to +105c cl pin sink current i cl 7 20 40 a ta = -40c to +105c output short detection voltage v short 0.45 0.50 0.55 v fb1, fb2 pin voltage pgood block pgood on resistor r pgood 0.5 1.5 2.5 k ? v fb1 , v fb2 = 0 v ta = -40 c to +105 c pgood pin leakage current i pgood - 0 1 a v pgood = 5 v, v fb1 ,v fb2 = 0.8 v ta = -40 c to +105 c output overvoltage detection voltage v over 0.848 0.868 0.888 v fb1, fb2 pin voltage output low voltage detection voltage v low 0.712 0.732 0.752 v fb1, fb2 pin voltage * this product is not designed to be radiation-resistant. downloaded from: http:///
datasheet datasheet 9/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 typical performance curves 0 10 20 30 40 50 60 70 80 90 100 0.00.51.01.52.02.53.03.54.0 load current : [a] efficiency : [%] upper: 5v output below: 3.3v output 792 794 796 798 800 802 804 806 808 - 4 0- 2 00 2 04 06 08 01 0 0 ambient temperature : ta[] reference voltage : vfb[v] vcc = 12 v fosc = 350 khz ta = 25c figure 5. shutdown current figure 4. efficiency figure 6. curcuit current figure 7. reference voltage vs. temperature characteristics 0 2 4 6 8 10 - 4 0- 2 0 0 2 04 06 08 01 0 0 ambient temperature : ta[c] circuit current : lcc[a] 0 1 2 3 4 5 6 7 8 9 10 0 1 02 03 0 input voltage : vin[v] standby current : ist[a] downloaded from: http:///
datasheet datasheet 10/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 typical performance curves 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 -40 -20 0 20 40 60 80 100 ambient temperature : ta[] uvlo threshold voltage [v] 270 280 290 300 310 320 330 -40 -20 0 20 40 60 80 100 ambient temperature : ta[] osilating frequency fosc[khz] 80 85 90 95 100 - 4 0- 2 00 2 04 06 08 01 0 0 ambient temperature : ta[] cl threshold voltage : vswth[mv] rt = 200 k ? figure 8. cl pin threshold voltage vs. temperature characteristics figure 9. frequency vs. temperature characteristics return voltage figure 10. ss charge current vs. temperature characteristics figure 11. uvlo operation/return voltage vs. temperature characteristics 5 6 7 8 9 10 11 12 13 14 15 -40 -20 0 20 40 60 80 100 ambient temperature : ta[] charge current : iss[a] operation voltage downloaded from: http:///
datasheet datasheet 11/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 typical performance curves 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 ambient temperature : ta[] en threshold voltage ven[v] 0.0 0.1 0.2 0.3 - 4 0- 2 00 2 04 06 08 01 0 0 ambient temperature : ta[] fb output current : ifb[a] 0.6 0.7 0.8 0.9 1.0 - 4 0- 2 00 2 04 06 08 01 0 0 ambient temperature : ta[] output over/low sense voltage : [v] overvoltage detection low voltage detection 0.0 0.5 1.0 1.5 2.0 2.5 3.0 - 4 0- 2 00 2 04 06 08 01 0 0 ambient temperature : ta[] pgood on presistance : rpgood[k] figure 12. en threshold voltage vs. temperature characteristics figure 13. fb pin source current vs. temperature characteristics figure 14. pgood pin on resistance vs. temperature characteristics figure 15. output overvoltage / low voltage detection voltage vs. temperature characteristics ambient temperature : ta[c] ambient temperature : ta[c] ambient temperature : ta[c] ambient temperature : ta[c] pgood on resistance : pgood[k ? ] downloaded from: http:///
datasheet datasheet 12/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 timing chart startup operations pr otection operations pre-bias function figure 18. pre-bias functionality timing chart figure 16. startup operations timing chart figure 17. protection operations timing chart y i va% downloaded from: http:///
datasheet datasheet 13/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 selection of external components (1)setting the output l value the coil value significantly influences the output ripple current. as shown in the following equation, the larger the coil, and the higher the switching frequency, the lower the ripple current. the optimal output ripple current setting is ca. 30% of the maximum output current. i l = 0.3i o max [a] i l output ripple current, f switching frequency outputting a current in excess of the coil current rating will cause magnetic saturation of the coil and will decrease efficien cy. it is recommended to allow for sufficient margin to ensure that the peak current does not exceed the coil current rating. use low resistance (dcr, acr) coils to mi nimize coil loss and increase efficiency. (2)setting the output capacitor co value select the output capacitor with consideration to acceptable ripple voltage (vpp ). the following equation is used to determine the output ripple voltage. the output co setting needs to be kept within the allowable ripple voltage range. allow for a sufficient voltage ou tput margin in establishing the capacitor rating. low esr capacitors enable a lower output ripple voltage. also, to meet the re quirement for s etting the output startup time parameter within the soft start time range, take the conditions described in the f ollowing capacitance equa tion for output capacitors into consideration. t ss (i limit - i o ) t ss soft start time c o v o i limit over current detection limit note: non-optimal capacitance values may cause startup problems. especially in cases of extr emely large capacitance values, the possibility exists that the inrush current at startup will activate the overcurrent protection, thus not starting the output. t herefore, verification and conformation with the actual application is recommended. (3)setting the input capacitor (c in) the input capacitor serves to lower the output impedance of the power source connected to the input pin (vcc,vcccl,extvcc). increased power supply output impedance can cause input voltage (vcc) instability and may negatively impact oscillation and ripple rejection characteristics. therefore, it is necessary to place an input capacitor in close proximity to the vcc and gnd pins. select a low esr capacitor with the required ripple current capacity and the capability to withstand temperature changes without wide tolerance fluctuations. the ripple current i rms is determined by the following equation. also, be certain to ascertain the operating temperature, load range and mosfet conditions for the application in which the capacitor will be used since capacitor performance is heavily dependent on the appl ications power supply characteristics, pcb wiring pattern and mosf et gate-drain capacity. i l figure 19. output ripple current vcc - v o v o l vcc f i l = [a] vcc - v o v o i l vcc f l = [h] i l v o 1 c o vcc f v pp = i l r esr + [v] note. f switching frequency figure 20. input capacitor 1/f v o vcc - v o vcc i rms = i o [a] v o c o i l i o vcc l v o c o vcc l c in i o downloaded from: http:///
datasheet datasheet 14/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 (4)setting the output voltage (v o ) the output voltage is determined by the equation below. select a combination of r1 and r2 to obt ain the required voltage. note that a small resistor value leads to a drop in power efficiency and that a large resi stor value leads to an increase of th e offset voltage due to fb pin source current of 0.13a (typ). (5)setting the oscillation frequency (f osc ) the setting of the internal oscillation frequency is possible by use of the resistor value con necter to rt. the setting range is 250khz to 550khz. the correlation between the resistor value and the oscillation frequency is as shown in the table and figure 22. below. setting a resistor outside the range shown below may cause the swit ching to stop after witch operation is no longer guaranteed. note that in case the input/output voltage difference is small, the oscillation frequency is divided by 5, reducing the output voltage drop. the detail behavior is described in the description of oscillator on page 4. figure 22. rt resistor vs. oscillation frequency (6)setting the soft start time (t ss ) the soft start function is necessary to prevent inrush of coil current and output voltage overshoot at startup. the figure 23. shows the relation between soft start time and capacitance, which can be calculated by usin g the equation. 0 . 8 v ( t y p ) c ss t ss = [sec] i ss 10 a (typ) figure 23. capacitance vs. soft start time capacitance values between 0.01f and 0.1f are recommended. there is a possibility that an overshoot is generated in the output due to the phase compensation, out put capacitor, etc. therefore, verifi cation and confirmation with the actual application is recommended. use high accuracy components (x5r ) when implementing sequential startups involving other power sources. rt resistor oscillation frequency 180k ? 200k ? 220k ? 240k ? 270k ? 300k ? 250khz 300khz 350khz 400khz 480khz 550khz 100 200 300 400 500 600 700 150 200 250 300 350 rt resitance[k ] frequency[khz] 0.1 1 10 0.01 0.1 ss capacitance[ f] delay time[ms] figure 21. setting the output voltage v o = 0.8 r1 + r2 r2 downloaded from: http:///
datasheet datasheet 15/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 (7)setting the overcurrent detection value (i limit ) when the peak of the current in the coil exceeds the overcurren t detection value, overcurrent protection is activated. the dete ction value is determined by the resistor r cs connected between vcccl and cl and the cl pin threshold voltage (typ 90mv). it can be calculated using the formula below. 90mv i limit = [a] r cs when the overcurrent protection is activated, the output duty is limited to prevent an increase in output current. the overcurr ent protection is an auto-recovery type; when the output load returns to normal state, the output duty and output volta ge also return to the n ormal state. the voltage generated by the overcurrent detection resistor provides feedback to the internal slope and is also used in determi ning the switching duty. to prevent sub-harmonic oscillation at time of high duty cycles, the equat ion below needs to be satisfied. v o r cs duty 0.09 l f osc in case the equation above is not satisfied, revise the constants or settings. (8)selecting mosfet fet used nch mos ? v ds > vcc ? v gsm1 > v boot-sw ? v gsm2 > vreg5 ? allowable current > output current + ripple current value higher than the overcurrent protection value is recommended select a low on resistance mosfet for high efficiency note in case the input capacitance of the output fet is extremely large, the possibility exists that the ef ficiency decreases due to the shortening a dead time of the upper and lower output fet. for the input capacitance of the output fe t, a value of 1200pf or lower is recommended. as these characteristics are influenced by the pcb layout and the type of the components verification and confirmation with the actual application is recommended. (9)selecting schottky barrier diode ? reverse voltage v r > vcc ? allowable current > output current + ripple current value higher than the over cu rrent protection value is recommended. select a diode with a low forward voltage and fast recovery for high efficiency. o vercurrent i l figure 26. selecting mosfet figure 27. selecting schottky barrier diode figure 24. setting the overcurrent detection value figure 25. the point of detecting overcurrent v o c o vcc l i l vcccl cl r cs v o c o i l i o vcc l v ds v ds v gsm2 v gsm1 v o c o i l i o vcc l v r downloaded from: http:///
datasheet datasheet 16/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 (10)setting the phase compensation circuit negative feed back stability conditions are as follows. ? at time of unity gain (0db) the phase delay should be 135 ? or less. (i.e. the phase margin is 45 ? or higher) also, the crossover frequency (frequency of 0db) of the whole system is set to 1/10 of less of the switching frequency because dc/dc converter applications are sampled by the switching frequency. in summary, the characteristics that t he application target is as follows. ? at time of unity gain (0db), the phase delay should be 135 ? or less. (i.e. the phase margin is 45 ? or higher) ? fc is less than 1/10 of switching frequency the response is determined by the limitat ion of fc. therefore, the switching frequency is required to high in order to increase the response. the phase compensation is set by the capacitor and resist or which are connected in series to the comp pin. achieving stability by using the phase compensation is done by cancelling the fp1 and fp2 (error amp pole and power stage pole) of the regulation loop by use of fz1. fp1, fp2 and fz1 are determined in the following equations. also, by inserting a capacitor in c2, phase lead fz2 can be added. in the for mula above, g m is the error amp transconductance (400 a/v) and a v is the error amp voltage gain (200v/v). this setting is obtained by using a simplified calculation, ther efore, adjustment on the actual application may be required. also as these characteristics are influenced by the pcb layout, load conditions, etc. verification and confirmation with the actual application at time of ma ss production design is recommended. (11)setting the boot pin serial resistors (r boot ) by connecting resistors to the boot pin, it becomes possible to adjust the turn on delay and rise time at switching. placing the resistors also allows for the adjustment of the upper and lower fet dead time and is effective as noise countermeasure at time of switching. as shown in figure 29., place the resistor at r boot so as not to limit the charge current i charge of the capacitor c boot for the boot pin boost. in case the resistor r boot is large, the possibility exists that voltage drop is generated between the boot pin voltage is no longer guaranteed. therefore set r boot to no higher than 10 ? . (12)concerning switching pulse jitter and split there are cases in which, when the switching pulse duty is at ca. 50%, it is influenced by the other switching pulse resulting in jitter or split (small duty and large duty are alternately output) on/off the switching output. if the jitter and split cause a problem take the steps listed below. (a) serially place resister r cl to pin cl (b) place resister r outl to the lower gate. generally, the jitter and split are suppressed with r cl resister of 200 ? to 300 ? and r outl resister of 4.7 ? to 10 ? . however, as these characteristics are influenced by the pcb layout, used fet, etc. verification and confirmation with the actual application is recommended. fp2 = 1 2 c o r load fz1 = 1 2 c1 r1 fz2 = 1 2 c2 r2 figure 28. setting phase compensation circuit figure 29. setting the boot pin serial resistors figure 30. measures of jitter and split fp1 = g m 2 c1 a v vreg5 boot sw i boot i charge r boot c boot downloaded from: http:///
datasheet datasheet 17/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 frequency characteristic evaluation the dc/dc converters frequency characteristics (phase marg in, gain margin) can be measured by using a gain-phase analyzer or fra. 1 confirm that output does not oscillate in a closed loop with maximum load. 2 isolate and and insert vm (amplitude of ca. 20mvpp to 100mvpp). 3 measure (probe) the oscillation of to that of . the phase margin can also be measured with the load responsiveness. measure the variation in output voltage when instantaneously changing the load from no load to maximum load. if ringing occurs, the phase margin is insufficient. if no ringing occurs, the phase margin is sufficient. the actual phase margin can not be measured. figure 31. measurement of frequency characteristic phase margin is insufficient phase margin is enough output load maximum load output voltage t 0 downloaded from: http:///
datasheet datasheet 18/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 application circuit example application circuit is same both BD9015KV-M and bd9016kv-m parameter symbol spec example input voltage vcc 6v to 28v output voltage/ current v o 1 / i o 1 5v / 4a v o 2 / i o 2 3.3v /4a output ripple voltage v pp 20mvp-p switching frequency f osc 350khz operating temp. range ta -40c to 105c figure 32. reference circuit figure 37. efficiency v o 2=3.3v figure 38. output ripple voltage v o 2=3.3v figure 39. frequency characteristic v o 2=3.3v figure 40. load response v o 2=3.3v i o 2 : 2.0a/div @ dc 100s/div v o 2 : 10mv/div @ ac 2.0us/div vcc=12v i o 2=2.0a phase gain vcc=12v i o 2 step 0a to 4.0a tektronix mso5204 tektronix mso5204 nf fra5087 figure 33. efficiency v o 1=5v figure 34. output ripple voltage v o 1=5v figure 35. frequency characteristic v o 1=5v figure 36. load response v o 1=5v i o 1 : 2.0a/div @ dc v o 1 : 300mv/div @ ac 100s/div v o 1 : 10mv/div @ ac 2.0us/div vcc=12v i o 1=2.0a phase gain vcc=12v i o 1 step 0a to 4.0a tektronix mso5204 tektronix mso5204 nf fra5087 v o 2 : 200mv/div @ ac 0 10 20 30 40 50 60 70 80 90 100 01234 output current:io[a] efficiency[%] 0 10 20 30 40 50 60 70 80 90 100 01234 output current:io[a] efficiency[%] vcc=12v vcc=12v d1 and d2 are optional. if you use d1 and d2, efficiency increases from 1% to 3%. vcc=12v i o 2=4.0a vcc=12v i o 1=4.0a bd9015kv/ bd9016kv c in 1 c in 2 c in 3 c in 4 r cs 1 r cs 2 r cs 3 r cs 4 d1 d2 d3 d4 r cl1 r cl2 r boot1 r boot2 c in 5 c boot1 c boot2 l1 l2 c in 6 c vreg5a c vreg5 m1 m2 r outl1 r outl2 c o 1 c o 2 c o 3 c o 4 c o 5 c o 6 c1 c2 c ss1 c ss2 c5 c4 c3 r1 r2 r3 r4 r5 r6 r7 rt r pgood1 r pgood2 downloaded from: http:///
datasheet datasheet 19/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 these setting values are the reference. as these charac teristics may be influenced by the pcb layout pattern, used components, etc. verification and confirmation with the actual application is recommended. no package parameters part name(series) type manufacturer r1 1005 43k ,1%,1/16w mcr01 series chip resistor rohm r2 1005 8.2k ,1%,1/16w mcr01 series chip resister rohm r3 1005 5.6k ,1%,1/16w mcr01 series chip resistor rohm r4 1005 47k ,1%,1/16w mcr01 series chip resistor rohm r5 1005 15k ,1%,1/16w mcr01 series chip resistor rohm r6 1005 3.9k ,1%,1/16w mcr01 series chip resistor rohm r7 1005 1k ,1%,1/16w mcr01 series chip resistor rohm rt 1005 220k ,1%,1/16w mcr01 series chip resistor rohm r cl1 1005 300 ,1%,1/16w mcr01 series chip resistor rohm r cl2 1005 300 ,1%,1/16w mcr01 series chip resistor rohm r boot1 1005 10 ,1%,1/16w mcr01 series chip resistor rohm r boot2 1005 10 ,1%,1/16w mcr01 series chip resistor rohm r outl1 1005 4.7 ,1%,1/16w mcr01 series chip resistor rohm r outl2 1005 4.7 ,1%,1/16w mcr01 series chip resistor rohm r pgood1 1005 100k ,1%,1/16w mcr01 series chip resistor rohm r pgood2 1005 100k ,1%,1/16w mcr01 series chip resistor rohm r cs 1 2012 20m ,1%,1/3w ucr10 series chip resistor rohm r cs 2 2012 20m ,1%,1/3w ucr10 series chip resistor rohm r cs 3 2012 20m ,1%,1/3w ucr10 series chip resistor rohm r cs 4 2012 20m ,1%,1/3w ucr10 series chip resistor rohm c1 1005 100pf,ch,50v gcm series ceramic murata c2 1005 4700pf,r,50v gcm series ceramic murata c3 1005 100pf,ch,50v gcm series ceramic murata c4 1005 6800pf,r,50v gcm series ceramic murata c5 1005 4700pf,r,50v gcm series ceramic murata c ss1 1005 0.1uf,r,16v gcm series ceramic murata c ss2 1005 0.1uf,r,16v gcm series ceramic murata c boot1 1005 0.1uf,r,16v gcm series ceramic murata c boot2 1005 0.1uf,r,16v gcm series ceramic murata c vreg5a 1608 1uf,x7r,16v gcm series ceramic murata c vreg5 1608 1uf,x7r,16v gcm series ceramic murata c in 1 3225 4.7uf,x7r,50v gcm series ceramic murata c in 2 3225 4.7uf,x7r,50v gcm series ceramic murata c in 3 3225 4.7uf,x7r,50v gcm series ceramic murata c in 4 3225 4.7uf,x7r,50v gcm series ceramic murata c in 5 3216 1uf,x7r,50v gcm series ceramic murata c in 6 3216 1uf,x7r,50v gcm series ceramic murata c o 1 3225 22uf,x7r,16v gcm series ceramic murata c o 2 3225 22uf,x7r,16v gcm series ceramic murata c o 3 3225 22uf,x7r,16v gcm series ceramic murata c o 4 3225 22uf,x7r,16v gcm series ceramic murata c o 5 3225 22uf,x7r,16v gcm series ceramic murata c o 6 3225 22uf,x7r,16v gcm series ceramic murata d1 pmds average i = 3a max rb050l-40 schottky diode rohm d2 pmds average i = 3a max rb050l-40 schottky diode rohm d3 pmdu average i = 1a max rb160m-40 schottky diode rohm d4 pmdu average i = 1a max rb160m-40 schottky diode rohm m1 sop8 drain current = 9a max sp8k4 transistor rohm m2 sop8 drain current = 9a max sp8k4 transistor rohm l1 6.36 x 3.56 x 6.1mm 10h xal6060 series coil coilcraft l2 6.36 x 3.56 x 6.1mm 10h xal6060 series coil coilcraft downloaded from: http:///
datasheet datasheet 20/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 input filter for reference, lists the input filter circuits for emc measure to figure 41.. the type filter is 3 rd order lc filter. this is used when it is not su fficient to use only the decoupling capacitor. the type filter can behave good performance as emc filter by large attenuation characteristic. tvs(transient voltage suppressors) is used for primary protection of automotive battery power supply line. the general zener diode is insufficient because it is necessa ry to tolerate the high energy of load dump condition. the tvs is in below list is recommended. the reverse pola rity diode is required for protection when the power supply, such as battery, is connected in reverse by mistake. r e c o m m e n d a t i o n p a r t s v e n d e r l i s t show recommendation parts vender below. no part name(series) manufacturer l xal series coilcraft clf series tdk c cd series nichicon ud series nichicon tvs sm8 series vishay d s3a thru s3m series vishay no type manufacturer url c electrolytic capacitor nichicon www.nichicon.com c ceramic capacitor murata www.murata.com l coils coilcraft www.coilcraft.com l coils tdk www.global.tdk.com l coils sumida www.sumida.com d diodes vishay www.vishay.com d diodes/resister rohm www.rohm.com figure 41. filter circuit downloaded from: http:///
datasheet datasheet 21/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 power dissipation ic unit ic mounted on rohm standard board glass epoxy board of 70mm 70mm 1.6mm v qfp48c 0 0.2 0.4 0.6 0.8 1 1.2 0 25 50 75 100 125 150 ambient temperature: ta( ) power dissipation: pd w) 1.10w 0.75w figure 42. thermal derating characteristic ( c ) downloaded from: http:///
datasheet datasheet 22/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 i/o equivalence circuits downloaded from: http:///
datasheet datasheet 23/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 operational notes 1) absolute maximum ratings exceeding the absolute maximum rating for supply voltage, oper ating temperature or other parameters can result in damages to or destruction of the chip. in this event it also becomes impossible to determine the cause of the damage (e.g. short circuit, open circuit, etc). therefore, if any specia l mode is being considered with values expected to exceed the absolute maximum ratings, implementing physical safety measures, such as adding fuses, should be considered. 2) gnd electric potential keep the gnd pin potential at the lowest (minimum) potential under any operating condition. furthermore, excluding the sw pin, the voltage of all pin should never drop below t hat of gnd. in case there is a pin with a voltage lower than gnd implement countermeasures su ch as using a bypass route. 3) power dissipation should by any chance the power dissipation rating be exceed ed the rise in temperature of the chip may result in deterioration of the properties of the chip. therefore allow for sufficient margins to ensure use within the power dissipation rating. 4) input power supply concerning the input pins vcc, vcccl and extvcc, the lay out pattern should be as short as possible and free from electrical interferences. 5) electrical characteristics the electrical characteristics given in this specification may be influenced by conditions such as temperature, supply voltage and external components. transient characteristics should be sufficiently verified. 6) thermal shutdown (tsd) this ic incorporates and integrated thermal shutdown circuit to prevent heat damage to the ic. normal operation should be within the power dissipation rating, if however t he rating is exceeded for a continued period, the junction temperature(tj) will rise and the tsd circuit will be activate d and turn all output pins off. after the tj falls below the tsd threshold the circuits are automat ically restored to normal operation. note that the tsd circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no circumstances, should the tsd circuit be used in a set design or for any purpose other than protecting the ic from heat damage. 7) inter-pin shorting and mounting errors ensure that when mounting the ic on the pcb the direction and position are correct. incorrect mounting may result in damaging the ic. also, shorts caused by dust entering betw een the output, input and gnd pi n may result in damaging the ic. 8) in some applications, the vcc and pin potential might be reversed, possibly resulting in circuit internal damage or damage to the elements. for example, while the external ca pacitor is charged, the vcc shorts to the gnd. for the vreg5 output pin use a capacitor with a capacitance with less than 100 f. we also recommend using reverse polarity diodes in series or a bypass diode between all pins and the vcc pin. 9) operation in strong electromagnetic fields use caution when operating in the presence of strong electromagnetic fields, as this may cause the ic to malfunction. 10) in applications where the output pin is connected to a large inductive load, a counter-emf ( electromotive force) might occur at startup or shutdown. a diode should be added for protection. 11) testing on application boards the ic needs to be discharged after each test process as, wh ile using the application board for testing, connecting a capacitor to a low-impedance pin may cause stress to the ic. as a protection from static electricity, ensure that the assembly setup is grounded and take sufficient caution with tr ansportation and storage. also, make sure to turn off the power supply when connecting and disconnecting the inspection equipment. 12) gnd wiring pattern when both a small-signal gnd and a high c urrent gnd are present, single-point grounding (at the set standard point) is recommended. this in order to separate the small-si gnal and high current patterns and to ensure that voltage changes stemming from the wiring resistance and high curr ent do not cause any voltage change in the small-signal gnd. similarly, care must be taken to avoid wiring patte rn fluctuations in any connected external component gnd. downloaded from: http:///
datasheet datasheet 24/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 13) ss pin note that the ss pin will go into test mode when supplied with 5v or more. 14) this monolithic ic contains p+ isolation and p substr ate layers between adjacent elements in order to keep them isolated. p-n junctions are formed at the intersection of these p layers with t he n layers of other elements, creating a parasitic diode or transistor. relations between each potential may form as shown in the example below, where a resistor and transistor are connected to a pin: with the resistor, when gnd pin a, and with the transistor(npn), when gnd pin b: the p-n junction operates as a parasitic diode with the transistor (npn), when gnd pin b: the p-n junction operates as a parasitic transistor by interacting with the n layers of elements in proximity to the parasitic diode described above parasitic diodes inevitably occur in the structure of the ic . their operation can result in mutual interference between circuits and can cause malfunctions and, in turn, physical damage to or destruction of the chip. therefore do not employ any method in which parasitic diodes can operate such as applying a voltage to an input pin that is lower than the (p substrate) gnd. 15) vo short to vcc (bd9016kv-m) when the over voltage protection is activated by supplying volt age to vo from externally, for instance vo is shorted to vcc in application, the large current may appear in coil and l-side fet since the output capacitor is discharged by the over voltage protection. a reverse protecti on diode should be added for protection. the structure example of the ic downloaded from: http:///
datasheet datasheet 25/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 ordering information b d 9 0 1 x k v - m e 2 part numbe r bd9015kv or bd9016kv package kv: vqfp48c packaging and forming specification e2: embossed tape and reel marking diagram part number marking BD9015KV-M bd9015kv bd9016kv-m bd9016kv vqfp48c (top view) part number marking lot number 1pin mark downloaded from: http:///
datasheet datasheet 26/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 physical dimension tape and reel information package name vqfp48c 1pin mark direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tapequantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 1500pcs e2 () 1pin downloaded from: http:///
datasheet datasheet 27/27 BD9015KV-M bd9016kv-m tsz02201-0t1t0pb00040-1-2 ? 2013 rohm co., ltd. all rights reserved. www.rohm.co.jp tsz22111 ? 15 ? 001 22 .jul.2013 rev.001 revision history date revision changes 22.jul.2013 001 new release downloaded from: http:///
datasheet d a t a s h e e t notice - ss rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. if you intend to use our products in devices requiring extremely high reliability (such as medical equipment (note 1) , aircraft/spacecraft, nuclear power controllers, etc.) and whos e malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sales representative in advance. unless otherwise agreed in writ ing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses in curred by you or third parties arising from the use of any rohms products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are not designed under any special or extr aordinary environments or conditi ons, as exemplified below. accordingly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any rohms products under an y special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used; if flow soldering met hod is preferred, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
datasheet d a t a s h e e t notice - ss rev.002 ? 2014 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohms internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since our products might fall under cont rolled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with rohm representative in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. rohm shall not be in any way responsible or liable for infringement of any intellectual property rights or ot her damages arising from use of such information or data.: 2. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the information contained in this document. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice C we rev.001 ? 2014 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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