View R1218N041ATR-F_6646616.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

r1218x series step-up dc/dc converter for white led backlight no.ea-166-080407 1 outline the r1218x series are pwm control type step-up dc/dc converter ics with low supply current. the r1218x is fully dedicated to drive white led with constant current. each of these ics consists of an nmos fet, an oscillator, a pwm comparator, a voltage reference unit, an error amplifier, an under voltage lockout circuit (uvlo), an over-voltage protection circuit (ovp), and so on. the r1218x can drive white leds with high efficiency with low supply current. a diode is built-in the r1218xxx1a, therefore it is possi ble to drive up to 4leds without an external diode. the r1218xxx2a, an external diode is necessary, however, up to 6 serial leds can be driven with the r1218xxx2a. constant current can be set with an external resistance value. dimming control is possible by pwm signal for ce pin. feedback voltage is 0.2v, therefore power loss by current setting resistance is small and efficiency is good. maximum duty cycle is internally fixed, typ. 91%. leds can be driven from low voltage. protection circuits are the current limit of lx peak current, the over volta ge limit of output, and the under voltage lockout function. packages are standard sot-23-6 and very tiny dfn(plp)1820-6. features ? input volt age.................................................. 1.8v to 5.5v ? built-in 400ma, 1.5 ? , 20v nch mosfet and diode (r1218xxx1a) ? built-in 400ma, 1.5 ? , 29v nch mosfet (r1218xxx2a) ? oscillator frequency (pwm control)............. 1.2mhz ? maximum duty cycle .................................... typ. 91% ? feedback voltage ......................................... typ. 0.2v ? uvlo threshold voltage .............................. typ. 1.6v (hysteresis typ. 0.1v) ? lx current limit pr otection............................. typ. 700ma ? over voltage protection (ovp) th reshold .... typ. 9. 5v (r1218x021a) typ. 14.0v (r1218x031a) typ. 18.5v (r1218x041a) typ. 23.0v (r1218x052a) typ. 27.5v (r1218x062a) ? led dimming control ..................................... by external pw m signal (frequency 200hz to 5khz) to ce pin by feedback voltage and filtered pwm signal (high frequency) ? packages ...................................................... sot-23-6 , dfn(plp)1820-6 application ? white led backlight for portable equipment
r1218x 2 block diagrams r1218xxx1a r1218xxx2a
r1218x 3 selection guide the ovp threshold voltage and the package for the ics can be selected at the user's request. the selection can be available by desig nating the part number as shown below; r1218xxxxx -xx -x part number a b c d code contents a designation of package type: n: sot-23-6 k: dfn(plp)1820-6 b designation of ovp threshold and with/without of built-in diode 021a: 9.5v with built-in diode 031a: 14.0v with built-in diode 041a: 18.5v with built-in diode 052a: 23.0v without built-in diode 062a: 27.5v without built-in diode c designation of taping type: ex. tr (refer to taping specificatio ns; for sot-23-6 and dfn(plp)1820-6) d designation of composition of plating: ? f : lead free plating (sot-23-6) none : au plating (dfn(plp)1820-6)
r1218x 4 pin configurations ? sot-23-6 ? dfn(plp)1820-6 6 5 4 1 2 3 (mark side) top view 6 54 123 bottom view 4 5 6 3 2 1 pin descriptions ? sot-23-6 ? dfn(plp)1820-6 pin no. symbol description pin no. symbol description 1 ce chip enable pin 1 ce chip enable pin 2 v out output pin 2 v fb feedback pin 3 v in power supply input pin 3 lx switching pin (open drain output) 4 lx switching pin (open drain output) 4 gnd ground pin 5 gnd ground pin 5 v in power supply input pin 6 v fb feedback pin 6 v out output pin ? tab in the parts have gnd level. (they are connected to the back side of this ic.) do not connect to other wires or land patterns.
r1218x 5 absolute maximum ratings (gnd = 0v) symbol item rating unit v in v in pin voltage 6.5 v v ce ce pin voltage ? 0.3 to v in + 0.3 v v fb v fb pin voltage ? 0.3 to v in + 0.3 v r1218xxx1a ? 0.3 to 22 v out v out pin voltage r1218xxx2a ? 0.3 to 32 v r1218xxx1a ? 0.3 to 22 v lx l x pin voltage r1218xxx2a ? 0.3 to 32 v i lx l x pin current 800 ma power dissipation (sot-23-6) * 420 p d power dissipation (dfn(plp)1820-6) * 880 mw topt operating temperature range ? 40 to 85 c tstg storage temperature range ? 55 to 125 c *) for power dissipation, please refer to package information to be described. absolute maximum ratings absolute maximum ratings are threshold limit values that must not be exceeded ever for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits.
r1218x 6 electrical characteristics ? r1218xxxxa top t = 2 5 c symbol item conditions min. typ. max. unit v in input voltage 1.8 5.5 v i dd supply current v in = 5.5v, v fb = 0v, lx at no load 0.5 1.0 ma i standby standby current v in = 5.5v, v ce = 0v 0 3.0 a v uvlo1 uvlo detector threshold v in falling 1.5 1.6 1.7 v v uvlo2 uvlo released voltage v in rising v uvlo1 + 0.1 1.8 v v ceh ce input voltage "h" v in = 5.5v 1.5 v v cel ce input voltage "l" v in = 1.8v 0.5 v r ce ce pull down resistance v in = 3.6v 600 1200 2200 k ? tshtdn ce shutdown delay time v in = 3.6v 10 ms v fb v fb voltage v in = 3.6v 0.19 0.20 0.21 v ? v fb / ? t opt v fb voltage temperature coefficient v in = 3.6v, ? 40 c < = < = c 150 ppm /c i fb v fb input current v in = 5.5v, v fb = 0v or 5.5v ? 0.1 0.1 a r on switch on resistance v in = 3.6v, i sw = 100ma 1.5 ? r1218xxx1a v lx = 20v 0 3.0 a i lxleak switch leakage current r1218xxx2a v lx = 29v 0 3.0 a i lxlim switch current limit v in = 3.6v 400 700 1000 ma vf diode forward voltage r1218xxx1a i diode = 100ma 0.8 v i diodeleak diode leakage current r1218xxx1a v out = 20v, v lx = 0v 10 a fosc oscillator frequency v in = 3.6v, v out = v fb = 0v 1.0 1.2 1.4 mhz maxduty maximum duty cycle v in = 3.6v, v out = v fb = 0v 86 91 % r1218x021a 8.5 9.5 10.5 r1218x031a 13.0 14.0 15.0 r1218x041a 17.0 18.5 20.0 r1218x052a 21.5 23.0 24.5 v ovp1 ovp detector threshold v in = 3.6v, v out rising r1218x062a 26.0 27.5 29.0 v r1218x021a v ovp1 ? 0.5 r1218x031a v ovp1 ? 0.75 r1218x041a v ovp1 ? 1.0 r1218x052a v ovp1 ? 1.25 v ovp2 ovp released voltage v in = 3.6v, v out falling r1218x062a v ovp1 ? 1.5 v
r1218x 7 typical applications r1218x041a r1218x062a c1 v in l x ce gnd 1 f l1 22 h c2 0.22 ? v out v fb c1 v in l x ce gnd 1 ? v out v fb ? led current setting led current can be set with feedback resistor(r1) i led = 0.2 / r1 ? led dimming control, softstart (1) led dimming control by pwm signal to ce pin led dimming control is possible by forcing pwm signal to ce pin. when the power-on or start up with ce pin, softstart func tion works, however, after that, if the ce pin is set as "l" and set ce pin "h" again during the shutdown delay time, softstart function is disabled and starts up fast to normal mode, therefore 200h z to 5khz pwm signal is standard. by the ce pin input, led turns on and off. average led current varies depending on the dut y cycle of ce input. too high frequency pwm signal is not effective because of its delay. ce v fb r1 dimming controle by ce pin input
r1218x 8 (2) dimming control by dc voltage led dimming control is also possible by using the dc voltage to v fb pin. led current is adjustable by dc voltage and resistors, r1 and r2 in the following figure. i led = (dc ? 0.2) / r2 ? 0.2 / r1 dc v fb r1 r2 dimming control by dc voltage (3) dimming control by feedback voltage and filtered pwm signal led dimming control is also possible by using the feedback voltage and filtered pwm signal. led current is adjustable according to the "h" level (v h ) and "l" level(v l ) of pwm signal and resistors, r1, r2, r3, and r4 in the figure5. v h v fb r3 r2 r1 r4 c3 v l dimming controle by filtered pwm signal duty = 0% to 100% pwm signal duty cycle can be used up to the maximum led current and minimum led current as in the next formulas. i ledmin = {0.2 ? r2 (v h ? 0.2) / (r3 + r4)} / r1 i ledmax = {0.2 ? r2 (v l ? 0.2) / (r3 + r4)} / r1 for example, supposed that the pwm signal level is set as 2.5v/0v, to adjust the led current range from 0ma to 20ma by the duty cycle, our recommendatio n external components values are, r1=10 ? , r2=5.1k ? , r3=51k ? , r4=5.1k ? or around. c3 should be set large enough to regard the pwm signal as adjustable dc voltage by the filter. in this method, higher frequency control than the frequency agains t the ce pin can be used for dimming control. for example, if the fr equency is 40khz, 0.1 f or more capacitor is our recommendation value as c3.
r1218x 9 ? selection of inductors the peak current of the inductor at normal mode can be calculated as next formula: i lx peak = 1.25 i led v out / v in + 0.5 v in (v out ? v in ) / (l v out fosc) when the start-up or dimming control by ce pin, transi ent current flows, the peak current must be equal or less than the current limit of the ic. the peak current should not beyond the rating current of the inductor. for example, for 4 serial led drive from v in = 3.6v, recommendation value of the inductor is 22 h or more. ? selection of capacitors set 1 f or more value bypass capacitor c1 between v in pin and gnd pin as close as posible. set 0.22 f or more capacitor c2 between v out and gnd pin. test circuits a v in ce gnd v fb v out l x r1218x series v in ce gnd v fb v out l x r1218x series oscilloscope supply current test circui t uvlo detector threshold, uvlo released voltage v in ce gnd v fb v out l x r1218x series oscilloscope v in ce gnd v fb v out l x r1218x series oscilloscope vfb voltage, oscillator frequency, ovp detector threshold, maximum duty test circuit ovp released voltage test circuit
r1218x 10 typical characteristics 1) efficiency vs. led current (2led) l:lqh32cn220 (topt=25 c) r1218x021a r1218x021a led current l led (ma) efficiency (%) 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =1.8v 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =3.6v led current l led (ma) efficiency (%) r1218x021a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =4.2v led current l led (ma) efficiency (%) 2). efficiency vs. led current (3led) l: lqh32cn220 (topt=25 c) r1218x031a r1218x031a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =2.7v led current l led (ma) efficiency (%) 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =3.6v led current l led (ma) efficiency (%)
r1218x 11 r1218x031a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =4.2v led current l led (ma) efficiency (%) 3) efficiency vs. led current (4 led ) l: lqh32cn220 (topt=25 c) r1218x041a r1218x041a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =2.7v led current l led (ma) efficiency (%) 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =3.6v led current l led (ma) efficiency (%) r1218x041a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =4.2v led current l led (ma) efficiency (%)
r1218x 12 4) efficiency vs. led current (6led) l: lqh32cn220, diode: crs02 (topt=25 c) r1218x062a r1218x062a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =2.7v led current l led (ma) efficiency (%) 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =3.6v led current l led (ma) efficiency (%) r1218x062a 012 8 41620 0 30 20 10 40 50 60 80 70 90 100 v in =4.2v led current l led (ma) efficiency (%) 5) pwm dimming control (2 led) v in =3.6v, r1=10 ? 5-1. duty vs. led current (topt=25 c) r1218x021a 5khz 1khz 200hz 060 40 20 80 100 duty (%) 0 7.5 5.0 2.5 10.0 12.5 15.0 20.0 17.5 22.5 25.0 led current l led (ma)
r1218x 13 5-2. output voltage waveform (topt=25 c) r1218x021a r1218x021a 0 2.4 1.6 0.8 3.2 ce input voltage v ce (v) 0 10 5 fosc=200hz 0 5 10 output voltage time (ms) output voltage v out (v) ce input voltage 0 0.12 0.08 0.04 0.16 0 10 5 fosc=5khz 0 5 10 ce input voltage v ce (v) output voltage time (ms) output voltage v out (v) ce input voltage 6) pwm dimming control (4 led) v in =3.6v, r1=10 ? 6-1. duty vs. led current (topt=25 c) r1218x041a 5khz 1khz 200hz 060 40 20 80 100 0 7.5 5.0 2.5 10.0 12.5 15.0 20.0 17.5 22.5 25.0 duty (%) led current l led (ma) 6-2. output voltage waveform (4 led) (topt=25 c) r1218x041a r1218x041a 0 2.4 1.6 0.8 3.2 0 20 10 fosc=200hz 0 5 10 ce input voltage v ce (v) output voltage time (ms) output voltage v out (v) ce input voltage 0 0.12 0.08 0.04 0.16 0 20 10 fosc=5khz 0 5 10 ce input voltage v ce (v) output voltage time (ms) output voltage v out (v) ce input voltage
r1218x 14 7) pwm dimming control (6 led) v in =3.6v, r1=10 ? 7-1. duty vs. led current (topt=25 c) r1218x062a 5khz 1khz 200hz 060 40 20 80 100 0 7.5 5.0 2.5 10.0 12.5 15.0 20.0 17.5 22.5 25.0 duty (%) led current l led (ma) 7-2. output voltage waveform (6 led) (topt=25 c) r1218x062a r1218x062a 0 2.4 1.6 0.8 3.2 0 20 10 fosc=200hz 0 5 10 ce input voltage v ce (v) output voltage time (ms) output voltage v out (v) ce input voltage 0 0.12 0.08 0.04 0.16 0 20 10 fosc=5khz 0 5 10 ce input voltage v ce (v) output voltage time (ms) output voltage v out (v) ce input voltage 8) v fb voltage vs. temperature 9) uvlo detector threshold/released voltage vs. temperature r1218x041a r1218x041a -40 25 0 -25 50 75 85 temperature topt ( c) v fb voltage v fb (v) v in =3.6v 0.185 0.210 0.205 0.200 0.215 0.195 0.190 -40 25 0 -25 50 75 85 temperature topt ( c) uvlo detector threshold uvlo1 (v) v in =3.6v 1.50 1.70 1.74 1.66 1.62 1.58 1.54 uvlo released uvlo detector
r1218x 15 10) oscillator frequency vs. temperature 11) maximum duty cycle vs. temperature r1218x041a r1218x041a -40 25 0 -25 50 75 85 oscillator frequency fosc (khz) v in =3.6v 1300 1350 1400 1250 1200 1150 1050 1100 1000 temperature topt ( c) -40 25 0 -25 50 75 85 maxduty (%) v in =3.6v 95 97 99 93 91 87 89 85 temperature topt ( c) 12) ovp detector threshold/released voltage vs. temperature 13) supply current vs. temperature r1218x041a r1218x041a ovp detector threshold ovp released voltage -40 25 0 -25 50 75 85 ovp detector threshold v ovp1 (v) v in =3.6v 19.0 19.5 20.0 20.5 18.5 18.0 17.0 17.5 16.5 temperature topt ( c) -40 25 0 -25 50 75 85 supply current i cc ( a ) v in =3.6v 200 240 280 320 360 160 120 40 80 0 temperature topt ( c) 14) l x current limit vs. temperature r1218x041a -40 25 0 -25 50 75 85 lx current limit ilim ( ma ) v in =3.6v 800 900 1000 700 600 400 500 300 temperature topt ( c)
r1218x 16 15) ovp transient response (topt=25 c) r1218x021a r1218x041a ovp voltage 060 40 20 80 100 time (ms) ovp detector threshold v ovp1 (v) 0 12.5 10.0 7.5 15.0 5.0 2.5 ovp voltage 060 40 20 80 100 0 25 20 15 10 5 time (ms) ovp detector threshold v ovp1 (v) r1218x062a 060 40 20 80 100 0 25 30 35 20 15 10 5 ovp voltage time (ms) ovp detector threshold v ovp1 (v) 16) efficiency dependence on inductors (4 led) r1218x041a (intemal diode type) lqh32cn220k53 lqh32cn100k53 glf2012t220k glf2012t100k 015 10 520 50 75 70 65 80 85 90 60 55 v in =3.6v led current l led (ma) efficiency (%)
package information pe-sot-23-6-0611 ? sot-23-6 (sc-74) unit: mm package dimensions 4 5 2 6 1 1.9 0.2 0.8 0.1 0 to 0.1 0.4 +0.1 ? 0.2 1.1 +0.2 ? 0.1 2.9 0.2 2.8 0.3 1.6 +0.2 ? 0.1 (0.95) (0.95) +0.1 ? 0.05 0.15 0.2 min. taping specification 5 64 2 13 2.0 0.05 4.0 0.1 0.3 0.1 1.5 +0.1 0 3.3 4.0 0.1 2.0max. tr user direction of feed 3.5 0.05 8.0 0.3 1.75 0.1 3.2 ? 1.1 0.1 taping reel dimensions reuse reel (eiaj-rrm-08bc) (1reel=3000pcs) 11.4 1.0 9.0 0.3 2 0.5 13 0.2 180 60 0 ? 1.5 +1 0 21 0.8
package information pe-sot-23-6-0611 power dissipation (sot-23-6) this specification is at mounted on board. power dissipation (p d ) depends on conditions of mounting on board. this specification is based on the measurement at the condition below: measurement conditions standard land pattern environment mounting on board (wind velocity=0m/s) board material glass cloth epoxy plactic (double sided) board dimensions 40mm 40mm 1.6mm copper ratio top side : approx. 50% , back side : approx. 50% through-hole 0.5mm 44pcs measurement result (topt=25 c,tjmax=125 c) standard land pattern free air power dissipation 420mw 250mw thermal resistance ja = (125 ? 25 c)/0.42w = 263 c/w 400 c/w 0 50 100 25 75 85 125 150 ambient temperature ( c) 0 200 100 300 400 420 500 600 power dissipation p d (mw) on board 40 40 power dissipation measurement board pattern ic mount area unit : mm recommended land pattern 0.7 max. 0.95 0.95 1.9 2.4 1.0 (unit: mm)
package information pe-dfn(plp)1820-6-071010 ? dfn(plp)1820-6 unit: mm package dimensions a b 1.80 2.00 0.05 0.05 4 index 0.6max. 0.05 m ab 0.20 0.1 0.25 0.1 1.0 0.1 0.25 0.1 1 3 4 6 0.5 0.3 0.1 1.6 0.1 0.1nom. bottom view attention: tabs or tab suspension leads in the parts have v dd or gnd level.(they are connected to the reverse side of this ic.) refer to pin discription. do not connect to other wires or land patterns. taping specification 1.5 +0.1 0 0.25 0.1 1.1max. 4.0 0.1 2.0 0.05 4.0 0.1 2.2 2.4 1.1 0.1 1.75 0.1 3.5 0.05 8.0 0.3 tr user direction of feed taping reel dimensions reuse reel (eiaj-rrm-08bc) (1reel=5000pcs) (r5323k,r5325k : 1reel=3000pcs) 2 0.5 21 0.8 11.4 1.0 9.0 0.3 60 ? +1 0 180 ? 0 ? 1.5 13 0.2 ?
package information pe-dfn(plp)1820-6-071010 power dissipation (dfn(plp)1820-6) this specification is at mounted on board. power dissipation (p d ) depends on conditions of mounting on board. this specification is based on the measurement at the condition below: measurement conditions standard land pattern environment mounting on board (wind velocity=0m/s) board material glass cloth epoxy plastic (double sided) board dimensions 40mm 40mm 1.6mm copper ratio top side : approx. 50% , back side : approx. 50% through-hole 0.54mm 30pcs measurement result (topt=25 c,tjmax=125 c) standard land pattern power dissipation 880mw thermal resistance ja = (125 ? 25 c)/0.88w = 114 c/w 0 50 100 25 75 85 125 150 ambient temperature ( c) 0 400 200 600 800 880 1000 power dissipation p d (mw) on board 1200 40 40 power dissipation measurement board pattern ic mount area unit : mm recommended land pattern 1.00 0.45 0.75 1.60 0.35 0.25 0.5 0.5 (unit: mm)
mark information me-r1218n-0610 r1218n series mark specification ? sot-23-6 (sc-74) 1 2 3 4 1 , 2 : product code (refer to part number vs. product code) 3 , 4 : lot number ? part number vs. product code product code part number 1 2 r1218n021a 2 a r1218n031a 2 b r1218n041a 2 c r1218n022a 2 d r1218n032a 2 e r1218n042a 2 f r1218n052a 2 g r1218n062a 2 h
mark information me-r1218k-071010 r1218k series mark specification ? dfn(plp)1820-6 1 2 3 4 5 6 1 to 4 : product code (refer to part number vs. product code) 5 , 6 : lot number ? part number vs. product code product code part number 1 2 3 4 r1218k021a y 0 0 1 r1218k031a y 0 0 2 r1218k041a y 0 0 3 r1218k022a y 0 0 4 r1218k032a y 0 0 5 r1218k042a y 0 0 6 r1218k052a y 0 0 7 r1218k062a y 0 0 8

▲Up To Search▲

Price & Availability of R1218N041ATR-F

	To Download R1218N041ATR-F Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .