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1/22 www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. regulators ics for digit a l cam e ras and camc orders system switching regulator ic with built-in fet (5v) bd9355mw v desc ri ptio n 7 channel switching regulator controller for digit al camera that contains an internal fet. built in the function that dim a white led for back lig ht with a diming set signal from a microcomputer. f e atu r es 1) 1.5v minimum input operating 2) supplies power for the internal circuit by step-up converter(ch1). 3) ch1step-up converter, ch2 cross converter, ch3,4 step-down converter, ch5 inverting converter for ccd, ch6 boost converter for ccd, ch7 boost converter for led 4) all channels contain internal power mosfet and compensation. built-in over voltage protection (ovp) for ch1,2,7 5) operating frequency 2. 0mhz(ch3,4), 1mhz(ch1,2,5 7) 6) contains sequence control circuit for ch1 4. it is possible to select sequence ch1 ? ch3 ? ch4 ? ch2 and ch1 ? ch4 ? ch3 ? ch2 by seq_ctl pin 7) built-in discharge switch (ch2,3,4) and contains off sequence control circuit for ch1 4. ch1,3 turn off after ch2,4 output voltage discharged. 8) built-in short-circuit protection (scp) 9) ch1 have backgate control circuit ch6 have high side switches with soft start function. 10) thermally enhanced uqfn036v5050 package(5mm 0.4mm pitch) a p p lic ati o n s for digital camera a b s o lute maximum r a tings (ta=25 ) parameter symbol ratings unit maximum applied power supply voltage hx2bat,vccout -0.3 7 v maximum applied input voltage vhx1 4, 56 -0.3 7 v ( hx56 - lx5) voltage -0.3 15 v vlx6 -0.3 22 v vlx7 -0.3 30 v maximum output current iomaxhx1, lx1 2.2 a iomaxhx2 1.5 a iomaxhx3 1.2 a iomaxhx4 1.0 a iomaxhx56 1.5 a iomaxhs6l +1.2 a iomaxlx7,8 1.0 a power dissipation pd 0.88 (*1) w operating temperature topr -25 +85 storage temperature tstg -55 +150 maximum applied power supply voltage hx2bat,vccout +150 *1 should be derated by 7.04mw/ at ta=25 or more. when mounted on a gl ass epoxy pcb of 74.2mm74.2 mm1.6 mm no.11036eat15 downloaded from: http:///
technical note 2/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. o per ati ng c o n d i tio n parameter symbol ratings unit conditions min. typ. max. power supply voltage vbat 1.5 - 5.5 v vref terminal connection capacity cvref 0.047 0.1 0.47 f pwm7 input frequency range fpwm 20 - 100 khz driver ch1 nmos/pmos drain current idpl1 2.1 a ch2 hx2bat input current iin2 1.4 a ch3 pmos drain current idpl3 1.0 a ch4 pmos drain current idpl4 0.5 a ch5 pmos drain current idpl5 1.4 a ch6 hs6l input current idpl6 1.1 a ch6,7 nmos drain current idnl6,7 0.9 a output voltage setting range ch1 4.5 5.4 v ch2 ( ) 5.4 v use with the following range. ch3 1.0 4.4 v ch4 1.0 4.4 v ch5 -9.5 -1.5 v ch6 5.5 16 v use with vbat technical note 3/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. protective functions parameter scp ocp ovp conditions ch1 step-up synchronous rectification stop when shorted output ovp: vccoutmonitor ch2 step-up voltage. scp:inv monitor ch3 step-down synchronous rectification scp:inv monitor ch4 step-up synchronous rectification scp:inv monitor ch5 inverse di rectification scp: error amp output (internal node) monitor ch6 step-up di rectification scp: error amp output (internal node) monitor ch7 step-up back light ovp:vo7 monitor ov er cur r e n t pr ote ctiv e p a rt parameter symbol limits unit conditions min. typ. max. ch1 lx1 ocp detecting current iocp1 2.5 a ch2 hx2bat ocp detecting current iocp2 2.0 a ch3 hx3 ocp detecting current iocp3 1.2 a ch4 hx4 ocp detecting current iocp4 1.2 a ch5 lx5 ocp detecting current iocp5 1.8 a ch6 hs6l ocp detecting current iocp6h 1.5 a ch6 lx6 ocp detecting current iocp6l 1.2 a ch7 lx7 ocp detecting current iocp7 1.2 a rec o mm en de d m a xim u m l o a d c u rre nt vo (v) vin (v) io_max (ma) condition vo (v) vin (v) io_max (ma) condition ch1 boost 5.0 1.8 400 l=4.3h (toko:de4518c) c=22f r1=390 , r2=75k ch5 reversal -6.5 2.5 100 l=4.7h (toko:de2815) c=10f r1=156k , r2=30k cc=1000pf 2.5 750 3.6 100 3.6 850 4.2 100 4.2 850 5.0 100 ch2 boost/ step- down 3.2 1.8 300 l=4.7h (toko:de2815) c=10f r1=440 , r2=200k cc=12pf ch6 boost 13 2.5 30 l=4.7h (toko:de2815) c=10f r1=360k , r2=30k 2.5 600 3.0 40 3.6 600 4.2 50 4.2 600 5.0 50 ch3 step down 1.2 1.8 800 l=4.7h (toko:de2815) c=10f r1=300 , r2=600k ch7 boost (worth 3 light led) 11.4 1.8 25 l=4.7h (toko:de2815) c=4.7f 2.5 1000 2.5 40 3.6 1000 3.6 40 4.2 1000 4.2 40 ch4 step down 1.8 2.5 500 l=4.7h (toko:de2815) c=10f r1=300 , r2=240k ch7 boost (worth 4 light led) 14 2.5 30 l=4.7h (toko:de2815) c=4.7f 3.0 500 3.6 40 3.6 500 4.2 40 4.2 500 5.0 40 downloaded from: http:///
technical note 4/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. e l ectr ic al c h a r act e rist ics (unless specified, ta=25 , vccout=5.0v, vbat=3v, stb13 7=3v,upic8=2.5v) parameter symbol limits unit conditions min. typ. max. low-voltage input malfunction prevention circuit detecting voltage vstd1 - 2.3 2.4 v vccout monitor release voltage vstd2 2.3 2.5 2.7 v vccout monitor hysteresis width S vstd 100 200 300 mv short circuit protection scp detect time tscp 20 25 30 ms timer start threshold voltage vtcinv 0.38 0.48 0.58 v inv monitor ch2 4 start-up circuit frequency fstart 150 300 600 khz hx2bat=1.8v start-up hx2bat voltage vst1 1.5 - - v start-up ch soft start time tss1 1.8 3.0 5.3 msec oscillating circuit frequency ch3,4 fosc1 1.6 2.0 2.4 mhz frequency ch1,2,5-7 fo sc2 0.8 1.0 1.2 mhz max duty 1(step-up) dmax1 81 86 90 % max duty ch2 lx21 dmax21 - - 100 % max dutych2 lx22 dmax22 81 86 90 % max duty 3, 4(step-down) dmax34 - - 100 % max duty5,6,7 dmax567 81 86 90 % error amp input bias current iinv - 0 50 na inv1 7, non5=3.0v inv threshold 1 vinv1 0.79 0.80 0.81 v ch1,3,4 inv threshold 2 vinv2 0.99 1.00 1.01 v ch2,6 inv7 threshold 1 vinv71 570 600 630 mv pwm7, duty=100% inv7 threshold 2 vinv72 436 450 473 mv pwm7, duty=75% inv7 threshold 3 vinv73 223 240 257 mv pwm7, duty=40% inv7 threshold 4 vinv74 15 30 45 mv pwm7, duty=5% for inverting base bias voltage vref ch5 output voltage vout5 - 6.072 -6.000 -5.928 v non5, 15k , 72k line regulation dvli - 4.0 12.5 mv vccout=2.8 5.5v output current when shorted ios 0.2 1.0 - ma vref=0v soft start ch2,5,6 soft start time tss2,5,6 3.1 5.3 7.4 msec ch3,4 soft start time tss3,4 1.2 2.1 3.0 msec ch7 duty restriction time tdtc 5.0 8.2 11.8 msec (*) recommend resistor value over 20k ? between vref5 to non5, because vref5 current is under 100a. this product is not designed for normal operation with in a radioactive environment. downloaded from: http:///
technical note 5/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. e l ectr ic al c h a r act e rist ics (ta=25 , vccout=5.0v, hx,hx2bat=3.6v, stb1 6=3v,pwm7=2.5v) parameter symbol limits unit conditions min. typ. max. output driver ch1 high side sw on resistance ron1p - 100 150 m ? hx1=5v ch1 low side sw on resistance ron1n - 60 120 m ? vccout=5.0v ch2 lx21 high side sw on resistance ron21p - 120 180 m ? hx2bat=3.6v ch2 lx21 low side sw on resistance ron21n - 120 180 m ? vccout=5.0v ch2 lx22 high side sw on resistance ron22p - 120 180 m ? vout2=3.6v ch2 lx22 low side sw on resistance ron22n - 100 150 m ? vccout=5.0v ch3 high side sw on resistance ron3p - 150 230 m ? hx3=3.6v , vccout=5v ch3 low side sw on resistance ron3n - 120 180 m ? vccout=5.0v ch4 high side sw on resistance ron4p - 200 300 m ? hx4=3.6v, vccout=5v ch4 low side sw on resistance ron4n - 150 230 m ? vccout=5.0v ch5 pmos sw on resistance ron5p - 450 700 m ? hx56=3.6v ch6,7 nmos sw on resistance ron6,7n - 500 750 m ? vccout=5.0v ch6 load sw on resistance ron6p 150 230 m ? hx56=3.6v led pin sw on resistance rled - 2.0 3.0 ? vccout=5.0v discharge switch ch2 discharge sw on resistance rdsw2 - 500 1000 ? vccout=5.0v ch3 discharge sw on resistance rdsw3 - 500 1000 ? vccout=5.0v ch4 discharge sw on resistance rdsw4 - 500 1000 ? vccout=5.0v stb1 6 stb control voltage active vstbh1 1.5 - 5.5 v non active vstbl1 -0.3 - 0.3 v pull down resistance rstb1 250 400 700 k ? pwm7 pwm7 threshold vpwm7 1.1 1.5 1.9 v pull down resistance rpwm7 250 400 700 k ? ch7 delay time for shutdown toff7 200 300 - usec circuit current stand-by current vccout terminal istb1 - - 5 a hx terminal istb2 - - 5 a step-down cross- converter lx terminal istb3 - - 5 a step-up circuit current when start-up (hx2bat current when voltage supplied for the terminal) ist - 150 450 a hx2bat=1.5v circuit current (vccout current when voltage supplied for the terminal) icc2 - 5.0 9.7 ma inv1 7=1.2v , non5=-0.2v this product is not designed for normal operation with in a radioactive environment. downloaded from: http:///
technical note 6/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. ref e re nce data (1) fig.4 frequency ch3,4 te m p fig.3 frequency ch1,2,5 7 te m p fig.2 start-up circuit frequency te m p [] [] [] ] [] ] fig.5-1 ch134 base voltage temp fig.5-2 ch26 base voltage temp fig.5-3 ch5 base voltage te m p ? [%] [] ? [%] [] ? [%] [] fig.6 ch1 5.0v voltage boost efficiency io fig.7 ch2 3.2 voltage boost efficiency io fig.8 ch3 1.2v step-down efficiency-io [%] [] = = = = = [%] [] = = = = = [%] [] = = = = = fig.9 ch4 1.8v step-down efficiency-io fig.10 ch5 C6.5v inverting efficiency io fig.11 ch6 13v boost efficiency io [%] [] = = = = [%] [] = = = = [%] [] = = = = downloaded from: http:///
technical note 7/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. ref e re nce data (2) fig.12 ch7 3led efficiency input voltage [%] [] = = fig.14 ch1 start-up waveform (vbat=1.5v) fig.15 ch1 start-up waveform ( vbat=3.6v ) fig.16 ch2~ch4 start-up waveform ( seq ctl=l ) fig.17 ch2~ch4 start-up waveform (seq_ctl=h) fig.18 ch5 start-up waveform fig.19 ch6 start-up waveform fig.20 ch7 start-up waveform fig.21 ch1~4 waveform when off (seq_ctl=h/l common) fig.22 ch7 waveform when off stb1234 ch1 voltage boost 5v ch1 voltage boost 5v ch2 cross converter 3.2v stb1234 ch3 step down 1.2v ch4 step down 1.8v ch1 voltage boost 5v ch2 cross converter 3.2v ch3 step down 1.2v ch4 step down 1.8v stb5 stb6 ch5 inverting -6.5v ch6 voltage boost 13v ch7 4led pwm7 ch1 voltage boost 5v ch2 cross converter 3.2v ch4 step down 1.8v ch3 step down 1.2v pwm7 ch7 4led lx7 ch1 voltage boost 5v [] [] __ _ _ _ fig.13 ivccout-vbat ( recommended a pp lication ) downloaded from: http:///
technical note 8/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 28 29 30 31 32 33 34 35 36 bd9355mwv inv7 led pwm7 vo7 lx7 pgnd567 lx6 stb6 hs6l stb1234 hx3 lx3 pgnd34 lx4 hx4 hx1 lx1 pgnd1 1 2 3 4 5 6 7 8 9 hx56 lx5 vout2 lx22 pgnd2 lx21 hx2bat stb5 seq_ctl inv6 non5 vref5 vccout gnd inv2 inv1 inv4 inv3 b l oc k di ag ram fig.23 bd9355mwv top view p i n des cri p tio n pin no pin name i/o function note 24 vccout i ic power supply input part of controller power supply for low side driver 23 gnd o ground terminal 10,5,15,33 pgnd1,2,34,567 o ground for internal fet 25 vref5 o ch5 reference output 12 hx1 o step up output voltage terminal (contains backgate control) 17,7,13,1 hx3,2bat,4,56 i ch2-6 pch fet source terminal , fet driver power supply 11,16,14,2,34,32 lx1,3, 4,5,6,7 i/o terminal for connecting inductor 6 lx21 i/o terminal for connecting inductor for ch2 input 4 lx22 i/o terminal for connecting inductor for ch2 output 3 vout2 o ch2 dc/dc output 36 hs6l o output terminal for internal load switch 21,22,19,20,27,28 inv1,2,3,4,6,7 i error amp inverted input 26 non5 i error amp non-inverted input 18,8,35 stb1234,5,6 i on/off switch h: operating over 1.5v 30 pwm7 i ch7 on/off control, pwm dimming input 9 seq_ctl i sequence control terminal gnd:ch1 ch3 ch4 ch2 vccout:ch1 ch3 ch4 ch2 29 led i terminal for connecting led cathode 31 vo7 i ch7 dc/dc output downloaded from: http:///
technical note 9/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. a p p lic ati on ci rcu i t(1) fig.24 applied circuit diagram 1(lithium 1 cell) operation notes ? we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristic s when using it. in addition, when using it with the external circuits constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external components and rohms ic in terms of not only static characteristic but also transient characteristic. downloaded from: http:///
technical note 10/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. a p plic ation circuit (2) fig.25 applied circuit diagram 2(dry battery 2) operation notes ? we are confident that the above applied circuit diagram should be recommended, but please thoroughly confirm its characteristic s when using it. in addition, when using it with the external circuits constant changed, please make a decision that allows a sufficient margin in light of the fluctuations of external components and rohms ic in terms of not only static characteristic but also transient characteristic. downloaded from: http:///
technical note 11/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. t i mi ng c h art ( 1 ) seq_ctl=l (gnd) seq_ctl=h (vccout) fig.26 ch1 4 start-up sequence stb1234 vo1 tss4 vo3 vo2 vo4 tss3 tss2 stb1234 vo1 tss3 vo4 vo2 vo3 tss4 tss2 downloaded from: http:///
technical note 12/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. t i mi ng c h art ( 2 ) stb5, stb6 ch5 revercing output tss6 ch6 output tss7 tss5 typ5.3msec tss6 typ5.3msec fig.27 ch5,6 start-up sequence fig.28 ch7 start-up sequence pwm7 input pulse or high level error amp output voltage is clamped during soft start output voltage correspond to duty of input pulse dtc7(internal node of ic error amp output( internal node of ic vo7 en7 ch7 internal start-up signal t dtc typ. 8.2msec stand up by pwm7's rising edge t dtc downloaded from: http:///
technical note 13/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. t i mi ng c h art ( 3 ) fig.29 ch1 4 off sequence fig.30 ch5,6 off sequence fig.31 ch7 off sequence stb5,6 vo5 discharge by segmentation registance and io vo6 ch5, 6 off stb1234 vo2 (3v) 15% of setting voltage vo4 (1.8v) discharge by segmentation registance and io vo3 (1.0v) vo1 (5.0v) 15% of setting voltage discharge by 500 sw discharge by 500 sw discharge by 500 sw 15% of setting voltage ch7 off when pwm=l continued on about 300 sec ch7 off discharge by io input duty pwm7 en7 dtc7 vo7 t off typ. 300usec t off (wait time for ch7 off) downloaded from: http:///
technical note 14/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. ch 7 di mmi ng f unct io n fig..32 ch7 block diagram ch 7 o per atio n the output duty control signal for soft start starts rising by connecting terminals led and inv7 when inputting any duty for pw m7. and threshold voltage of erroramp being proportional to pwm7 duty is supplied by pwm7 input signal after start up , then inv7 output voltage being proportional to pwm7 duty is supplied as the result of negative feedback of dcdc converter. dtc7 rises up slower comparatively with oscillating frequency by fixed degree incline. oscillating duty is restricted by dtc7 signal which is inputted to pwm comparator therefore input rush current is prev ented to occur even output voltage of erroramp at start up time rises up rapidly. the time from st art up to reaching set current of led is depend on input voltage, a number of led , pwm7 duty , resistor to set the current of led. the time to reach set current of led will be long when input voltage is low , a number of led is big , set output current is big because of high duty under that condition. when you input l voltage into pwm7 pin during over 500 sec typ, switch between led and inv7 and switching turn off. ch7 heve over voltage protection(ovp).when vo7 pin is over 28vtyp,ovp stop ch7 function..ovp latch ch7 function and reset dy all stb=l. att enti o n of ch 7 st art-u p in case ch7 start up, please turn on stb1234 before ch7.ch7 can not start before ch1,2,3,4 osc 1mhz ss slope en7 vo7 vbat error amp buffer en7 vo7 led + - i/o + - shut down uvlo ovp shut down ovp latch en7 20k 100khz 10k for scp comp led inv7 pwm7 lx7 vo7 shut down uvlo 0.6vmax s q r vo7=28vtyp detect shut down uvlo en control logic curent mode control filter bandgap driver downloaded from: http:///
technical note 15/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. rec o mm en de d m e th od of sett in g at th e tim e of inv 7 o u tp ut vo lt a ge s e tti n g . if inv7 output setting value is made larger than previous setting value during all intervals but soft start interval (at the ti me of starting up), it is recommended that the value of voltage is increased step by step with the smallest possible width of step after fully evaluating the restriction at t he soft side that controls rush current and switching and the vision of brightness e tc. in terms of set application. pwm7 duty inv7 voltage value inv7 is output voltage that proportionate to pwm7 input pwm pulse duty and control led current by external resister for setting (between inv7 and gnd ). led current is decided by note1 formula. (note 1) led current = inv7 voltage / resistance r for led current setting pwm7 inputduty[%] inv7 output voltage [mv] 5 30 10 60 15 90 20 120 25 150 30 180 35 210 40 240 45 270 50 300 55 330 60 360 65 390 70 420 75 450 80 480 85 510 90 540 95 570 100 600 fig.33 pwm7 duty C inv7 terminal voltage downloaded from: http:///
technical note 16/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. b loc k e x pl anat io n 1. scp, timer latch it is a timer latch type of short-circuit protection circuit. for ch1,2, 6 8, the error amp output voltage is monitored, and detected when the feedback voltage deviates from control, for ch3 5, it is detected when the voltage of inv termi nal becomes lower than 60%, and in 25ms the latch circuit operates and the outputs of all the channels are fixed at off. in order to reset the latch circuit, please turn off all the st b terminals before turning them on once again or turning power supply on once again. 2. u.v.l.o it is a circuit to prevent malfunction at low voltage. it is to prevent malfunction of internal circuit at the time of rising or dropping to a lower value of power supply voltage. if the voltage of vccout terminal becomes lower than 2.3v, then the output of each dc/dc converter is reset to off, and scps timer latch & soft start circuit are reset. when cont rol is deviated from, the operat ion of ch1 at the time of start-up will be explained in start up osc mentioned later. 3. voltage reference (vref5) for the reference voltage circuit of ch5 inversion ch, the output voltage is 1.25v and outputted from vref5 terminal (25pin). according this voltage and the output volt age of ch5, the dividing resistance (resistor) is set and then the output voltage is set. if stb5 terminal is made to be h level at the time of start-up, then increase gradually t he voltage up to 1.25v. the inversion output of ch5 follows this voltage and performs the soft start. 0.1 f is recommended as the external capacitor. 4. osc it is an oscillation circuit the frequency of which is fixed by a built-in cr. the operating frequencies of ch3, 4 are set at 2mhz, and t he operating frequencies of ch1, 2, 5 are set at 1mhz. 5. erramp 1 7 it is an error amplifier to detect output signal and output pwm control signal. the reference voltages of erramp (error amplifier) of ch1, 3, 4 are internally se t at 0.8v, and the reference voltages of e rramp (error amplifier) of ch2,6 are set at 1.0v. the reference voltage of ch5 is set at gnd potential, and for ch7s erramp7, the maximum value of the reference voltage is set at 0.6v. in addition, each ch incorporates a built-in element for phase compensation. 6. errcomp, start up osc it is a comparator to detect the output vo ltage and control the start circuit, and also an oscillator that is turned on/off by this comparator and starts operating from 1.5v. the frequency of this oscillator is about 300 khz fixed internally. this oscillator stops operating if vcc terminal becomes more than 2.5v or the soft start time is exceeded. 7. current mode control block ch1, 3 7 adopt the pwm method based on current mode. for a current- mode dc/dc converter, fet at the main side of synchronous rectification is turned on when detecting the clock edge, and turned off by detecting the peak current by means of the current comparator. 8. cross control duty controller for ch2 cross converter. it have pwm co mparator that compare 1mhz slope and error amp output and logic circuit for control 4 fet on/off switching.. lx21 max on duty is 100%, lx21 max on duty is 86%. 9. back gate control pchfet backgate selector controller in ch1. pchfet have body di between backgate and source,drain ordina ry. this circuit intercept ch1 step up output voltage by cutting body di line at stb off and control soft start .ch1 softstart output voltage from 0v like a slope. 10. nch driver, pch driver internal nch, pch fet driver cmos inverter type output circuit. 11. load sw it is a circuit, mounte d in ch6, to control the load sw. hx56 terminal (1pin) is input terminal, and the hs6l terminals (36pin) are output terminals. this control circuit can prevent the rush current at the time of sw on because the soft start star ts functioning at the time of start-up. in addition, this load sw is provided wi th ocp function to prevent the ic from damage. ensure that the ic is used within load sws rated current when used normally. downloaded from: http:///
technical note 17/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. 12. on/off logic it is the voltage applied to stb terminal and can control the on/off of ch1 ch6. if the voltage more than 1.5v is applied, then it becomes on, but if open or 0v is applied, then it becomes off, furthermore, it all the channels are turned off, then the whol e ic will be in standby state. in addition, stb1, 2, 3, 4 stb6 terminals contain respectively a built-in pull-down resistor of about 400k ? . pwm7 is the input terminal of the start signal and the light control signal of ch7 . it becomes high if the voltage more than 2.1v is applied and becomes low if the voltage less than 0.4v is applied. in addition, pwm7 terminal contains a built-in pull-down resistor of about 400k ? . 13. soft start it is a circuit to apply the soft start to the output voltage of dc/dc converter and prevent the ru sh current at the start-up. soft start time varies with the channels. a. ch1 ???? reaches the target voltage in 3.0ms. b. ch3,4 ??? reach the target voltage in 2.1ms. c. ch2,5,6 ?? reach the target voltage in 5.3ms. d. ch7 ???? reach the target voltage in 8.2ms. 14. brightness controller ch7 have led brightness controller.inv7 is output voltage that proportionate to pwm7 input duty and control led current by external resister for setting (between inv7 and gnd ). 15. ovp comp7 in ch7, when led is open, inv7 become l and output volt age increase suddenly. if this condition continues, lx7 voltage increase and exceed break down voltage. ch7 heve over voltage protection (ovp).when vo7 pin is inputted over 28vtyp, ovp stop ch7 function..ovp la tch ch7 function and reset dy all stb=l downloaded from: http:///
technical note 18/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. se ttin g me th od o f ic p eri ph eral co mp on en t s (1) design of feedback resistor constant fig.34 feedback resistor setting method (a) ch1,3,4 setting the reference voltage of ch1,3,4 error amp is 0.8v. please refer to formula (1) in fig.33 for determining the output voltage. this ic incorporates built-in phase compensation. please re fer to applied circuit diagram for setting the values of r1 & r2 and ensure that the setting values of r1 & r2 are of the order of several hundred k ? . (b) ch5 setting the reference voltage of ch5s error amp is connected to gnd inside the ic. therefore, a high-accuracy regulator can be configured if setting by the feedback resistance between the outputs of vref and ch5 as shown in fig.33. please refer to formula (2) in fig.33 for determi ning the output voltage. r1 is recommended as more than 20k ? because the current capacity of vref5 is about 100 a. (c) ch2,6 setting the reference voltage of ch7s error amp is 1.0v. please refer to formula (3) in fig.33 for determining the output voltage. (d) ch7 setting led current is decided by fig.33 (4) formula. please decide r3 value for led current range. (2) points for attent ion in terms of pcb layout of base-plate for a switching regulator, in principle a large current transiently flows through the r oute of power supply C coil C output capacitor. ensure that the wiring impedance is lowered as much as possible by making the pattern as wide as possible and the layout as short as possible. interference of power supply noise with feedback terminals (inv1 7,non5) may cause t he output voltage to oscillate. ensure that the power supply noises interf erence is avoided by making the wiring between feedback resistor and feedback terminal as short as possible. vref vref 0.8v vout1,3,4 error amp r1 r2 inv vref5 error amp r1 r2 non reference voltage is connected to gnd inside ic vout5 vref 1.0v vout2 , 6 error amp r1 r2 inv vout7 error amp7 r3 inv7 0.6v at duty100% r2 ch1,3,4output voltage ch5 output voltage ch2,6 output voltage ch7 output voltage io= [a] ??? (4) r3 inv7 vo= 0.8 [v] ??? (1) r2 (r1+r2) vo= 1.25 [v] ??? (2) r1 r2 vo= 1.0 [v] ??? (3) (r1+r2) downloaded from: http:///
technical note 19/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. pi n e q u i va lent c i rc uit inv1 inv6 (error amplifiers inversion input) non5 (error amplifiers non-inversion input) vref5 (ch5 standard voltage output) stb1234 (operating when ch1 4 on/off switch is high) pwm7 (ch7 start signal, led modulated light signal input) stb5,6 (operating when ch5,6 on/off switch is high) inv vccout vccout non5 vccout vccout hx2bat stb1234 vccout stb vccout vref5 vccout vccout pwm7 downloaded from: http:///
technical note 20/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. fig.35 pin equivalent circuit hx1,2bat,3,4,vout2 (pch fet source terminal) lx1,21,22,3,4(nch,pch fet drain terminal) pgnd1,2,34 (output stage earthing terminal) lx6,7 (nch fet drain terminal) pgnd567 hs6h (pmos high side sw input terminal) hs6l (omos high side sw input terminal) inv7(ch7 error amplifiers inversion input) led(led cathode connection terminal) hx1,2bat(pch fet fet source terminal) lx1,21(nch,pch fet drain terminal) pgnd1,2 (output stage earthing terminal) vccout pgnd lx hx,vout2 hs6l lx5 hx567 lx6,7 pgnd567 vccout vccout led inv7 vccout hx1 lx1 lx21 hx2bat pgnd2 pgnd1 downloaded from: http:///
technical note 21/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. not e s for use 1) absolute maximum ratings although the quality of this product has been tightly controlled, deterioration or even destruction may occur if the absolute maximum ratings, such as for applied pressure and operati onal temperature range, are ex ceeded. furthermore, we are unable to assume short or open mode destruction conditions . if special modes which exceed the absolute maximum ratings are expected, physical safely precautions such as fuses should be considered. 2) gnd potential the potential of the gnd pin s hould be at the minimum potential during all oper ation status. in addition, please try to do not become electric potential below gnd for the terminal other than non5 in cluding the transient phenomenon in practice. please do not go down below 0.3v for the non5 terminal with transient phenomenon and the like when you use. 3) heat design heat design should consider tolerance dissipation (pd) during actual use and margins which should be set with plenty of room. 4) short-circuiting between terminals and incorrect mounting when attaching to the printed substrate, pa y special attention to the direction and proper placement of the ic. if the ic is attached incorrectly, it may be destroy ed. destruction can also occur when ther e is a short, which can be caused by foreign objects entering between outputs or an output and the power gnd. 5) operation in strong magnetic fields exercise caution when operating in strong magnet fields, as errors can occur. 6) about common impedance please do sufficient consideration for the wiring of power so urce and gnd with the measures such as lowering common impedance, making ripple as small as possible (making the wi ring as thick and short as possible, dropping ripple from l.c) and the like. 7) heat protection circuit (tsd circuit) this ic has a built-in temperature protecti on circuit (tsd circuit). the temperature protection circuit (tsd circuit) is only to cut off the ic from thermal runaway, and has not been de signed to protect or guarantee t he ic. therefore, the user should not plan to activate this circuit with continued operation in mind. 8) rush current at the time of power supply injection. because there are times when rush current flows instantaneously in internal logical uncertain state at the time of power source turning on with cmos ic, please pay attention to t he power source coupling capacity, the width of gnd pattern wiring and power source, and the reel. 9) ic terminal input this ic is a monolithic ic, and between each element there is a p+ isolation and p substrate for element separation. there is a p-n junction formed between this p-layer and each elements n-layer, which makes up various parasitic elements. for example, when resistance and transisto r are connected with a terminal as in fig.35: when gnd>(terminal a) at the resistance, or gnd>(terminal b) at the transistor (npn), the p-n junction operates as a parasitic diode. also, when gnd>(terminal b) at the transistor, a para sitic npn transistor operates by the n-layer of other elements close to the aforementioned parasitic diode. with the ics configuration, the production of parasitic elements by the relationships of the electrical potentials is inevitable. the operation of the parasitic elements can also inte rfere with the circuit operati on, leading to malfunction and even destruction. therefore, us es which cause the parasitic elements to oper ate, such as applying voltage to the input terminal which is lower than the gnd(p-substrate), should be avoided. f ig.. 36 simple structure of bipolar ic (sample) p board n p n n p + p + (terminal a) parasitic element resistance parasitic element transistor (npn) gnd p board n p n n p + p + (terminal b) b n e c gnd gnd (terminala) gnd parasitic element downloaded from: http:///
technical note 22/22 bd9355mw v www.rohm.com 201 1.03 - rev . a ? 2011 rohm co., ltd. all rights reserved. or der in g p a rt n u mb er b d 9 3 5 5 m w v - e 2 part no. part no. package mwv : uqfn036v5050 packaging and forming specification e2: embossed tape and reel (unit : mm) uqfn036v5050 0.08 s s 1pin mark 1 3628 27 19 9 18 10 0.02 +0.03 - 0.02 0.2 +0.05 - 0.04 c0.2 0.4 0.9 5.0 0.1 2.7 0.1 2.7 0.1 0.5 0.1 5.0 0.1 1.0max (0.22) ? 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 2500pcs e2 () direction of feed reel 1pin downloaded from: http:///
datasheet d a t a s h e e t notice - ge rev.002 ? 2014 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (specific applications), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, 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 any ro hms 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 designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohms products under any 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 - ge 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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