1/4 rev. a structure silicon monolithic integrated circuit type step-down switching regulator integrated high side switc h product series BD9070FP features ? integrated fet 1ch step-down switching regulato r ? 1ch high side switch ? over voltage protection which can be variable by external resisters ? over current protection for switching regulator ? over current protection for high side switch ? thermal shut down circuit ? under voltage lock out circuit ? over current detection flag pin for high side switch absolute maximum ratings ta 25 parameter symbol limits unit supply voltage v in 36 v sw pin voltage v sw v in v output sw current i sw 2.1 1 a en, sync pin voltage v en / sync v in v rt, fb, inv pin voltage v rt , v fb , v inv 7 v vdd input voltage v dd 15 v hsdsw control voltage hsdctl v dd v hsdsw flag voltage hsdflg 6 v over voltage protection detection terminal ovpdet 6 v power dissipation pd 1.45 2 w operating temperature range topr -40 +105 storage temperature range ts t g - 5 5 +150 maximum junction temperature tjmax 150 1 however ,do not exceed pd. 2 pd derated at 5.52mw/ for temperature above ta=25 , mounted on a double layer pcb 70mm70mm1.6mm. (with thermal vias / copper area 70mm70mm) operating conditions however it does not guarantee the electric characteristic . parameter symbol min. max. unit recommend supply voltage v in 7 35 recommend supply voltage 2 v dd 2.7 5.5 v high side switch current i hsw - 0.7 a output switch current i sw - 2 a oscillator frequency f osc 50 500 khz external synchronous frequency f sync f osc 500 3 khz 3 however, do not exceed osc1.5. the product is not designed for protection against radioactive rays
2/4 rev. a electrical characteristics ( unless otherwise specified ta = 2 5 ,v in =13.2v,v en =5v,v dd =5v,hsdctl=5v ) parameter symbol limits unit condition min. typ. max. entire device stand-by current i stb - 0 10 ua v en = 0v operation current io - 4.3 9 ma io=0a,rt=51k ? ,inv=0.7v switch leakage current io leak - 0 30 ua v in =35v,v en =0v dc/dc reference voltage1 v ref 1 0.784 0.800 0.816 v v fb =v inv reference voltage2 v ref 2 0.784 0.800 0.816 v v in =10 16v,v fb =v inv input bias current i b -1 - - ua v inv =0.6v switching frequency1 f osc 1 240 300 360 khz rt=51k ? switching frequency2 f osc 2 238.5 300 361.5 khz v in =10 16v,rt=51k ? synchronous frequency f sync 495 500 505 khz rt=51k ? ,en/sync=500khz, duty=50% over current protection operation output current i olimit 2.1 4 - a output on voltage v enon 2.6 - - v output off voltage v enoff - - 0.8 v sink current i en - 35 90 ua v en =5v over voltage detection voltage v ovp 0.95 1.00 1.05 v over voltage hysteresis voltage v ovp hys - 50 - mv high side switch dc characteristic on resistance r on - 110 150 m ? io=10ma leakage current i leak - 0 10 ua hsdctl=0v over current limit threshold level ith lim 0.7 1.0 1.3 a flg output resistance r fl - 305 450 ? ifl=1ma flg output leakage current if ll - 0 1 ua vflg=5v control terminal hsd ctl input voltage h ctlh 2.0 - vdd v hsd ctl input voltage l ctll - - 0.8 v hsd ctl input current ictl -1.0 0.01 1.0 ua hsd ctl=0v or 5v ac characteristic output rise time t on 1 - 0.8 6 ms r l =20 ? output turn on delay time t on 2 - 1.1 10 ms r l =20 ? output fall time t off 1 - 2.7 20 us r l =20 ? output turn off delay time t off 2 - 19 40 us r l =20 ? over current blanking time t blank 6 8 10 ms r t =51k ? ,en/sync=400khz t on / t off time
3/4 rev. a block diagram physical dimentions ? marking uvlo tsd slop e pw m er r vre g vre g osc vre f vre g uvl o tsd syn c vin en/sync rt inv fb soft start vreg uvlo,tsd ovp,ocp,sc p r s drv logic drv vreg ovp ovp ocp ocp pvi n vreg pvi n ovp pvin batt cin1 sw vdd vdd hsdsw hsdsw fl g charge pump vdd ocd vdd control logic vreg hsd ctl uvlo tsd gn d pgnd vre g vre g cin3 rt c1 c3 r3 vre g vre g vreg vregb batt cin2 cb r1 r2 r4 c2 r5 r6 hsd uvlo hsd uvlo vreg hsd uvlo scp scp l1 c0 pin no. ? pin name function function 1 vregb fet driver drive power supply pin 14 n.c. non-connect (unused) pin 2 v in input power supply pin 15 vdd high side switch input pin 3 n.c. non-connect (unused) pin 16 vdd high side switch input pin 4 n.c. non-connect (unused) pin 17 ovp over voltage protection detection pin 5 pgnd ground pin 18 inv error amp input pin 6 gnd ground pin 19 fb error amp output pin 7 rt switching frequency setting pin 20 n.c. non-connect (unused) pin 8 en/sync dc/dc on/off pin external synchronous pulse input pin 21 sw dc/dc output pin 9 hsdctl high side switch on/off pin 22 sw dc/dc output pin 10 flg high side switch over current fl ag pin 23 n.c. non-connect (unused) pin 11 n.c. non-connect (unused) pin 24 pv in input power supply pin 12 hsdsw high side switch output pin 25 pv in input power supply pin 13 hsdsw high side switch output pin refer to the technical note about the details of the application. ? lo no. hsop25 unit mm BD9070FP
4/4 rev. a notes for use 1 absolute maximum range absolute maximum ratings are those values beyond which the life of a device may be destroyed we cannot be defined the failure m ode, such as short mode or open mode. therefore physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum rating s is considered. 2 operation supply voltage range the circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within operation supply voltage range. the standard electrical characteristic values are guaranteed at the te st circuit voltage of vin=13.2v. they cannot be guaranteed at other voltages in the operating range of 7v-35v. however, the variation will be small. 3 grounding it is recommended that every capacitor (bypass and another capa citors) is grounded to the ground pin using single-point connect ions. 4 input supply voltage input supply pattern layout should be as short as possible. 5 vin terminal for reduce the influence of switching noise, bypass capacitor is connected between vin and gnd. (over 2 f) 6. soft start the soft start block provides a function to prevent from the overshoot of the outpu t voltage vo through gradually increasing th e normal rotation input of the error amplifier when power supply turns on to gradu ally increase the switching duty. the soft start time is set to 5 msec (typ.). 7 fb terminal the fb terminal is for phase margin of the dc/dc system. a capacitor and a resistor or an only capacitor placed between the fb terminal and the inv terminal. the values of the capacitor and the resistor shall be adjusted according to the output current and the output capacit or value. the output may be oscillating if the value of capacitor is not sufficient, also the transient response may become insufficient if the value is too large. therefore, the value of the capacitor and the resistor shall be adequately set up based on the condition of the temperature, and so on. since the fb terminal also detects output short condition compulsorily applying an external voltage ont o the fb terminal must not be performed because it may acti vate the timer latch protection circuit. 8 electromagnetic fields the ic is susceptible to strong electromagnetic fields and may cause malfunction. therefore, caution should be used when placin g it on the pcb. 9 adjacent pin short mistake fitting use caution when orienting and positioning the ic for mounting on printed circuit boards. improper mounting may result in damag e to the ic. 10 application design when designing the external circuit, chose parts in condition of the enough margin that not only steady state but also transien t characteristics contain. 11 over output current protection it is recommend not to use that continuously operates the protection circuit (for instance, always the load that greatly exceed s the output current ability is connected or the output is short-circuited, etc.) in these protection circuits by an effective one to the destructio n prevention due to broken accident. 12. short circuit protection (scp) the short circuit protection operates when the output falls on 70% or less after the over current protection operates. when the short-circuit protection operates, the output voltage is turned off, and the average output current is limited between 1024 pulses of the sending freque ncy. when the input is turned on, this protection is off before setting voltage. 13 temperature protection (thermal down) circuit this ic has a built-in temperature protection circuit to prevent from the thermal destruction of the ic. as described above, be sure to use this ic within the power dissipation range. should a condition exceeding the power dissipation range continue, the chip temperature tj will ri se to activate the temperature protection circuit, thus turning off the output powe r element. then, when the tip temperature tj falls, the circuit will be automatically reset. furthermore, if the temperature protection circuit is ac tivated under the condition exceeding the maximum junction tempe rature, do not attempt to use the temperature protection circuit for set design.
5/4 rev. a version ? ? ? rev0.0.1 2007/05/11
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