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IS31BL3229 integrated silicon solution, inc. ? www.issi.com 1 rev.a, 09/17/2012 8-led backlight driver october 2012 general description the IS31BL3229 with a smart charge-pump circuit is a parallel white-led driver with eight matched 20ma current outputs. it can supply a total output current of 160ma over an input voltage range of 2.7v to 5.5v. IS31BL3229 typically draws less than 1a when placed in shutdown, and 0.7ma when operating in the no-load and 1x mode condition. if any of the outputs are not used, leave the pin(s) unconnected. brightness can be controlled by simple-series-control techniques and external pwm signal. IS31BL3229 is available in qfn-20 (3mm 3mm). it operates from 2.7v to 5.5v over the temperature range of -40c to +85c. features ? supply voltage: 2.7v ~ 5.5v ? 1x, 1.5x operating mode ? fade in and fade out mode ? output current can be 25ma ? 32 current level and pwm intensity control ? low input current ripple, low emi ? 90% high efficiency ? no inductors, low noise operation ? over voltage protection on output ? built-in thermal protection ? automatic soft start ? built-in thermal protection ? qfn-20 ( 3mm 3mm ) package applications ? cell phone, smart phone, pda ? mp3, mp4, pmp ? white led backlighting typical application circuit figure 1 typical application circuit note 1: pwm pin should be pulled high if modulated by en pin only. en pin should be pulled high if modulated with pwm pin only. please refer to page 8 for detail information. note 2: the fade in and fade out mode is only available when shut down and enable the ic by en pin. note 3: d1 must be connected and others can be floating in less than 8 leds application. note 4: the ic should be placed far away from the mobile antenna in order to prevent the emi.
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 2 rev.a, 09/17/2012 pin configuration package pin configuration (top view) qfn-20 20 19 18 6 7 8 9 10 17 16 pwm rset opt gnd d8 d1 d2 out cp1 cn1 pin description no. pin description 1 nc no connection. 2 vcc power supply input, requires 0.1 f and 1 f capacitor connect between this pin and ground pin. 3 cp2 flying capacitor positive terminal 2. 4 cn2 flying capacitor negative terminal 2. 5 en shutdown and output current control pin. pull low to shutdown the ic. 6 pwm pwm control pin. adjust the led intensity by pwm duty cycle. pull low at least 128ms (typ.), the ic should be shutdown. 7 rset external resistor for bias current. ?? 1600 / 25 . 1 ? ? set max r i 8 opt option pin. floating to operating in fifo mode. pull low to disable fifo. 9 gnd ground. 10~17 d8~d1 white led channel 8~1. d1 must be connected and others can be floating in less than 8 leds application. 18 out charge pump output to drive load circuits, requires 1 f capacitor connected between this pin and ground pin. 19 cp1 flying capacitor positive terminal 1. 20 cn1 flying capacitor negative terminal 1. thermal pad connect to gnd.
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 3 rev.a, 09/17/2012 ordering information industrial range: -40c to +85c order part no. package qty/reel IS31BL3229-qfls2-tr qfn-20, lead-free 2500 copyright ? ? ? 2012 ? integrated ? silicon ? solution, ? inc. ? all ? rights ? reserved. ? issi ? reserves ? the ? right ? to ? make ? changes ? to ? this ? specification ? and ? its ? products ? at ? any ? time ? without ? notice. ? issi ? assumes ? no ? liability ? arising ? out ? of ? the ? application ? or ? use ? of ? any ? information, ? products ? or ? services ? described ? herein. ? customers ? are ? advised ? to ? obtain ? the ? latest ? version ? of ? this ? device ? specification ? before ? relying ? on ? any ? published ? information ? and ? before ? placing ? orders ? for ? products. ? integrated ? silicon ? solution, ? inc. ? does ? not ? recommend ? the ? use ? of ? any ? of ? its ? products ? in ? life ? support ? applications ? where ? the ? failure ? or ? malfunction ? of ? the ? product ? can ? reasonably ? be ? expected ? to ? cause ? failure ? of ? the ? life ? support ? system ? or ? to ? significantly ? affect ? its ? safety ? or ? effectiveness. ? products ? are ? not ? authorized ? for ? use ? in ? such ? applications ? unless ? integrated ? silicon ? solution, ? inc. ? receives ? written ? assurance ? to ? its ? satisfaction, ? that: ? a.) ? the ? risk ? of ? injury ? or ? damage ? has ? been ? minimized; ? b.) ? the ? user ? assume ? all ? such ? risks; ? and ? c.) ? potential ? liability ? of ? integrated ? silicon ? solution, ? inc ? is ? adequately ? protected ? under ? the ? circumstances ?
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 4 rev.a, 09/17/2012 absolute maximum ratings supply voltage, v cc - 0.3v ~ +6.0v voltage at any input pin - 0.3v ~ v cc +0.3v junction temperature, t jmax 150c storage temperature range, t stg - 65c ~ +150c operating temperature ratings, t a ? 40c ~ +85c note: stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress rating s only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the sp ecifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical characteristics v cc = 2.7v ~ 5.5v, t a = 25c, unless otherwise noted. typical value are t a = 25c, v cc = 3.6v. symbol parameter condition min. typ. max. unit v cc operation range 2.7 5.5 v i cc operating current 1x mode, no load 0.7 ma 1.5x mode, no load 2 i sd shutdown current v en = 0v 1 a i out output current 200 ma i led led current for each channel r set = 100k ? 20 ma i (d-match) current matching between any two outputs 1 % v th transition threshold (d1 pin) v d1 falling 180 mv v uvlo input under voltage lockout threshold v cc rising or falling. 100mv hysteresis 2.4 v v set bias voltage for rset pin 1.25 v v ovp over voltage protect 5.5 v t fi fade in time fifo mode (note 5) 400 ms t fo fade out time fifo mode (note 5) 400 ms r ds_on output resistor 1x mode: (v cc -v out )/i out 1 ? t otp over temperature protection (note 6) 160 c t hys over temperature protection hysteresis (note 6) 40 c charge pump characteristics t st soft-start time (note 6) 150 s f clk clock frequency (note 6) 1 mhz
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 5 rev.a, 09/17/2012 electrical characteristics (continue) v cc = 2.7v ~ 5.5v, t a = 25c, unless otherwise noted. typical value are t a = 25c, v cc = 3.6v. symbol parameter condition min. typ. max. unit en, pwm pin characteristics v il enable threshold low v cc = 2.7v 0.4 v v ih enable threshold high v cc = 5.5v 1.4 v t lo en low time (note 6) 0.5 75 s t hi en high time (note 6) 0.5 75 s t off en off time (note 6) 500 s t lat en latch time (note 6) 500 s f pwm input frequency for pwm pin 0.1 50 khz t off_pwm pwm off time (note 7) 128 ms note 5: typical value. note 6: guaranteed by design. note 7: as the pwm pin is pulled low at least 128ms, the IS31BL3229 will be shutdown.
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 6 rev.a, 09/17/2012 typical performance characteristic output current(ma) supply voltage(v) 0 5 10 15 20 25 2.7 33.5 44.5 5 v en =v pwm =3.6v r set = 100k ? figure 2 supply voltage vs. output current output current(ma) en level 0 2 4 6 8 10 12 14 16 18 20 14 8 121620242832 r set = 100k ? v pwm =v cc = 3.6v figure 4 en pin dimming efficiency(%) supply voltage(v) 0 10 20 30 40 50 60 70 80 90 100 2.7 3 3.5 4 4.5 5 v en =v pwm =3.6v v f = 3.2v i led = 20ma r set = 100k ? figure 3 supply voltage vs. efficiency duty cycle(%) output current(ma) 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 r set = 100k ? v en =v cc = 3.6v f pwm = 1khz figure 5 pwm pin dimming
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 7 rev.a, 09/17/2012 function block
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 8 rev.a, 09/17/2012 application information general description the IS31BL3229 with a smart charge-pump circuit is a parallel white-led driver with eight matched 20ma current outputs. charge pump the built-in charge pump converter switches on automatically to ensure constant current output when the voltage of channel 1 (v d1 ) is below the threshold voltage v th (180mv). the charge pump converter only needs three external components: supply decoupling capacitor, output bypass capacitor and flying capacitor. choose low esr capacitors to ensure the best operating performance and place the capacitors as close as possible to the IS31BL3229. output current setting the maximum current (i max ) of each led can be set by the extra resister r set follow the equation (1) below. ?? 1600 / 25 . 1 ? ? set max r i (1) for example, in figure 1, r set = 100k ? , so, ?? ma k i max 20 1600 100 / 25 . 1 ? ? ? ? the recommended minimum r set is 82k ? , then the maximum i max is 24ma. the recommended maximum r set is 110k ? , then the minimum i max is 18ma. functional description the led intensity can be modulated by pulse count or pwm signal. en dimming mode the current level magnitude is controlled by pulse count control (pcc wire) serial interface. the interface records rising edges of the en pin and decodes them into 32 different states. the 32 current level settings available are indicated in table 1. the pwm pin should be pulled to high if modulated by en pin only. pwm signal dimming mode the pwm pin of the IS31BL3229 can accept a pwm signal to implement led dimming by changing the pwm duty cycle. recommended pwm frequency is in the range of 100hz ~ 50khz. table 1 current level setting (typical) v cc = 3.6v, r set = 100k ? , pwm pin is high. pulse i led (ma/ch) pulse i led (ma/ch) pulse i led (ma/ch) 1 20.0 12 13.125 23 6.25 2 19.375 13 12.5 24 5.625 3 18.75 14 11.875 25 5 4 18.125 15 11.25 26 4.375 5 17.5 16 10.625 27 3.75 6 16.875 17 10 28 3.125 7 16.25 18 9.375 29 2.5 8 15.625 19 8.75 30 1.875 9 15 20 8.125 31 1.25 10 14.375 21 7.5 32 0.625 11 13.75 22 6.875 fade in and fade out mode by floating the opt pin the fade in and fade out mode enable. when the en pin is pulled high to enable the ic, led fade in. when the en pin is pulled low at last t off to shutdown the ic, led fade out. pulling opt pin low to disable this mode (figure 6). figure 6 fifo function timing control the en pin should be configured as the figure 7. t lat is the latch time. high level should be at last t lat to active the pulse signal. t off is the shutdown time. en pin is pulled low at last t off the ic will be shutdown. figure 7 en pin timing
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 9 rev.a, 09/17/2012 thermal protection the IS31BL3229 has a thermal protection circuit that will shut down the chip if the die temperature rises above the thermal limit until the temperature falls down. design note the decoupling capacitors should be placed close to the vcc pin. a 0.1 f ceramic and an 1 f capacitors are recommended. the flying capacitor should be placed close to the cn and cp pins. the output capacitor should be placed close to the out pin and the traces of out pin connected to the capacitor should be as possible as short and wide. trace width should be at least 0.75mm when the current reaches 1a. trace width should be at least 1.0mm for the power supply and the ground plane. the thermal pad and the gnd pin should connect directly to a strong common ground plane for heat sinking.
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 10 rev.a, 09/17/2012 classification reflow profiles profile feature pb-free assembly preheat & soak temperature min (tsmin) temperature max (tsmax) time (tsmin to tsmax) (ts) 150c 200c 60-120 seconds average ramp-up rate (tsmax to tp) 3c/second max. liquidous temperature (tl) time at liquidous (tl) 217c 60-150 seconds peak package body temperature (tp)* max 260c time (tp)** within 5c of the specified classification temperature (tc) max 30 seconds average ramp-down rate (tp to tsmax) 6c/second max. time 25c to peak temperature 8 minutes max. figure 8 classification profile
IS31BL3229 integrated silicon solution, inc. ? www.issi.com 11 rev.a, 09/17/2012 package information qfn-20 note: all dimensions in millimeters unless otherwise stated.

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