1/4 rev. c structure silicon monolithic integrated circuit product name dual output dc / dc converter ic built in synchronous rectifier, with i 2 c interface type BD91362MUV features ? output voltage 8bit adjustable setting with i 2 c interface (fb1=fb2=0.900 1.075v / 25mv step) ? output current 3.0a/1.0a ? high efficiency and fast transient response ? i 2 c compatible interface(device address '1100011') absolute maximum rating ta = 2 5 parameter symbol limit unit avcc voltage v cc -0.3 +7 * 1 v pvcc voltage pv cc -0.3 +7 * 1 v v dvdd voltage dv dd -0.3 +7 * 1 v bst voltage v bst -0.3 +13 v bst-sw voltage v bst - sw -0.3 +7 v en ? sw ? ith voltage ven -0.3 +7 v scl ?sda voltage vsda ,vscl -0.3 +7 v power dissipation 1 pd1 0.34 * 2 w power dissipation 2 pd2 0.70 * 3 w power dissipation 3 pd3 2.21 * 4 w power dissipation 4 pd4 3.56 * 5 w operating temperature range topr -40 +105 storage temperature range tstg -55 +150 operating junction temperature tjmax +150 * 1 pd, aso, and tj=150 should not be exceeded. * 2 ic only. * 3 1 layer, mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb (copper foil area : 10.29mm 2 ) * 4 4 layers, mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb (1 st ,4 th copper foil area :10.29mm 2 2 nd ,3 rd copper foil area : 5505mm 2 ) * 5 4 layers, mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb (copper foil area : 5505mm 2 ) , copper foil in each layers. operating conditions ta = - 4 0 +105 parameter symbol min. typ. max. unit vcc voltage v cc 2.7 5.0 5.5 v pvcc voltage pv cc 2.7 5.0 5.5 v v dvdd voltage dv dd * 6 1.8 2.5 v cc v en voltage ven 0 - v cc v scl.sda voltage vsda ,vscl 0 - dv dd v output voltage range* 7 v out 1.0 - 3.3* 8 v sw average output current i sw 1 - - 3.0* 9 a sw average output current i sw 2 - - 1.0* 9 a * 6 v dvdd < v cc , pv cc * 7 initial set of i2c interfece * 8 in case set output voltage 1.6v or more, vccmin.=vout+1.2v. * 9 pd and aso should not be exceeded. this product is not designed for protection against radioactive rays.
2/4 rev. c electrical characteristics unless otherwise specified , ta=25 v cc =pv cc =5.0v, dv dd =2.5v, en=v cc parameter symbol limit unit condition min. typ. max. standby current i stb - 0 20 a en=0v bias current i cc - 500 800 a en low voltage v enl - gnd 0.8 v standby mode en high voltage v enh 2.0 vcc - v active mode en input current i en - 2 10 a en=2v oscillation frequency f osc 0.8 1 1.2 mhz high-side fet on resistance r on h1 - 60 90 m r on h2 - 170 255 m low-side fet on resistance r on l1 - 55 83 m r on l2 - 130 195 m fb reference voltage1 fb1 0.985 1.0 1.015 v 1.5% fb reference voltage2 fb2 0.985 1.0 1.015 v 1.5% ith sink current 1 i thsi 1 10 18 - a vfb1=1.2v ith source current 1 i thso 1 10 18 - a vfb1=0.8v ith sink current 2 i thsi 2 10 18 - a vfb2=1.2v ith source current 2 i thso 2 10 18 - a vfb2=0.8v uvlo threshold voltage v uvlol 2.4 2.5 2.6 v vcc=5 0v uvlo release voltage v uvloh 2.425 2.55 2.7 v vcc=0 5v soft start time t ss 0.5 1 2 ms timer latch time t latch 0.5 1 2 ms scp/tsd on output short circuit threshold voltage v scp 1 - 0.5 0.7 v fb1=1.0 0v(initial) v scp 2 - 0.5 0.7 v fb2=1.0 0v(initial) digital i/o (scl,sda) input low voltage v il - gnd 0.2 dv dd v input high voltage v ih 0.8 dv dd dv dd - v inflow current i in - 0 10 a scl=sda=2.5v data output low voltage v ol - - 0.6 v i ol =6ma physical dimension fb1,fb2 0.900 v 0.925 v 0.950 v 0.975 v 1.000 v 1.025 v 1.050 v 1.075 v pin no pin name pin no pin name 1 pvcc1 13 gnd 2 bst 14 ith2 3 sw1 15 fb2 4 sw1 16 ith1 5 sw1 17 fb1 6 pgnd1 18 vcc 7 pgnd1 19 scl 8 pgnd1 20 sda 9 pgnd2 21 dv dd 10 sw2 22 n.c 11 pvcc2 23 pvcc1 12 en 24 pvcc1 vqfn024v4040 (unit:mm) pin no., pin name fb reference voltage (initial) *fb1,fb2 change after 10usec(max) pass from setting the voltage by i2c interface *the time of 1step for fb1,fb2(25mv shift) take 5usec(max). *the time that output voltage reaches the setting value is 0.06msec(max). sw adj r1 r2 setting the output voltage the output voltage is set by the external resistor divider and is calculated as vout=(r2/r1+1) v fb ??? v fb fb pin feedback voltage (1.0v typ) it? s possible to adjust t he output voltage by r1 and r2. (the vout must be set from 1.0v to 3.3v. to c o n t r o l i 2 c bus,the vout can be set 0.9 3.475v) resistance r1 P 10k is recommended. please confirm the ripple voltage, if you can use the resistance more than 100k . v out lot no. 9 1 3 6 2
3/4 rev. c block diagram ? application circuit i2c - bus control map byte 1 is device address:[1100011] byte 2 is data bit, from bit5 to bit7 set fb2[2:0] , fr om bit1 to bit3 set fb1[2:0]. bit0 and bit4 input ?0? . the mode of this ic is write mode only . regsel register (write), initial value : 00h byte bit7 bit6 bit5 bit 4 bit 3 bit 2 bit 1 bit 0 1 device address[6:0] r/w 2 fb1[2:0] 0 fb2[2:0] 0 registre r/w bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 regsel w fb1[2:0] 0 fb2[2:0] 0 0 0 0 0 0 0 0 0 bit [7:5]: fb1[2:0] set ch1 output voltage ?000? 1.000v(initial) ?001? 0.925v ?010? 0.950v ?011? 0.975v ?100? 0.900v ?101? 1.025v ?110? 1.050v ?111? 1.075v bit [3:1]: fb2[2:0] set ch2 output voltage ?000? 1.000v(initial) ?001? 0.925v ?010? 0.950v ?011? 0.975v ?100? 0.900v ?101? 1.025v ?110? 1.050v ?111? 1.075v sw1 ith1 ith2 fb2 fb1 soft start1 slope1 r s q osc vref scp/ tsd scp2 soft start2 slope2 r s q scp1 clk2 gm amp current comp gm amp current comp clk1 clk2 pgnd2 sw2 gnd pv cc 2 pgnd1 pvcc pv cc 1 bst v cc current sense/ protect + driver logic current sense/ protect + driver logic vout2 fb2 vin vout1 fb1 vin i 2 c master dv dd sd a scl i 2 c i/f en selector uvlo dv dd
4/4 rev. c notes for use (1) absolute maximum ratings we are careful enough for quality control about this ic. so, t here is no problem under normal operation, excluding that it exce eds the absolute maximum ratings. however, this ic might be destroyed when the absolute maximum ratings, such as impressed voltages or the opera ting temperature range, is exceeded, and whether the destruction is short circuit m ode or open circuit mode cannot be specified. take into consi deration the physical countermeasures for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed. (2) gnd potential make setting of the potential of the gnd terminal so that it wi ll be maintained at the minimum in any operating state. furtherm ore, check to be sure no terminals are at a potential lower than the gnd voltage except for sw, pgnd, gnd terminals including an actual electric transient. (3) thermal design do not exceed the power dissipation (pd) of the package specif ication rating under actual operation, and design enough tempera ture margins. (4) short circuit mode between terminals and wrong mounting in order to mount the ic on a set pcb, pay thorough attention to the direction and offset of the ics. erroneous mounting can de stroy the ic. furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the gnd terminal, the ic can destroy (5) operation in strong electromagnetic field be noted that using the ic in the strong electromagnetic radiation can cause operation failures. (6) aso(area of safety operation.) do not exceed the maximum aso and the absolute maximum ratings of the output driver. (7) tsd(thermal shut-down) circuit the thermal shutdown circuit (tsd circuit) is built in this pro duct. when ic chip temperature becomes higher, the thermal shutd own circuit operates and turns output off. the guarantee and protection of ic are not pur pose. therefore, do not use this ic after tsd circuit opera tes, nor use it for assumption that operates the tsd circuit. (8) gnd wiring pattern use separate ground lines for control signals and high current pow er driver outputs. because these high current outputs that fl ows to the wire impedance changes the gnd voltage for control signal. therefore, each ground terminal of ic must be connected at the one point on the set circuit board. as for gnd of external parts, it is similar to the above-mentioned. (9) operation in supply voltage range functional circuit operation is guaranteed within operat ion ambient temperature, as long as it is within operation supply voltage range. the electrical characteristics standard value cannot be guaranteed. however, there is no drastic variati on in these values, as long as it is within operation supply voltage range. (10) we are confident in recommending the above application circuit example, but we ask that you carefully check the characteri stics of this circuit before using it. if using this circuit after modifying other external circuit constants, be careful to ensure adequate margins for var iation between external devices and this ic, including not only static characteristics but also tr ansient characteristics. if switching noise is high, insert t he low pass filter between vcc pin and pvcc pin, insert the schottky barrier diodes between sw pin and pgnd pin. (11) overcurrent protection circuit the overcurrent protection circuit is built in the output. if the protection circuit operates more than for specific hours (whe n the load is short.), the output will be latched in off. the output returns when en is turned on or uvlo is released again. these protection circuits are effect ive in the destruction prevention by broken accident. do not use in continuous circuit operation. (12) selection of inductor it is recommended to use an inductor with a series resistance element (dcr) 0.1 or less. note that use of a high dcr inductor will cause an inductor loss, resulting in decreased output voltage. should this conditi on continue for a specified period (soft start time + timer lat ch time), output short circuit protection will be activated and output will be latched off. when using an inductor over 0.1 , be careful to ensure adequate margins for variation between external devices and this ic, including transient as well as static characteristics. (13) dv dd the operating voltage range for dv dd is 1.8v~3.6v. the ic may not operate normally when the voltage is below than 1.8v. therefore, a stabile power supply is required to ensure the supply voltage is within the dv dd operating voltage range. when i2c is not been used, dv dd must be shorted to vcc. please be noticed that the output voltage fr om this ic can not be supplied to the dv dd .
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