SGM3135 3-channel low dropout low side white led driver general description the SGM3135 driver provides a simple solution for a matched current source for common anode led configuration. the SGM3135 can drive three leds or one led at three times the current. the factory preset current value is 20ma per channel. the SGM3135 requires only a 40mv dropout voltage at a 20ma load on each output to match the led brightness. the SGM3135 is available in green sot-23-6 package. it operates over an ambient temperature range of -40 to +85 . applications wireless handsets mp3, mp4, and pmp cellular phones portable communication devices digital cameras, camcorders pdas, palmtops, and handy terminals led/display back light driver leds for camera flash battery-powered equipment features support up to 3 leds low 40mv dropout at 20ma less than 5% led current matching simple led brightness control low shutdown current 2.5v to 5.5v supply voltage range low emi and switching noise enable/shutdown control operating temperature range: -40 to +85 available in green sot-23-6 package typical application led1 led2 led3 gnd en v in SGM3135 pwm v cc c in 0.1f rev. a. 2 sg micro corp www.sg-micro.com
3-channel low dropout low side white led driver 2 sg micro corp www.sg-micro.com SGM3135 package/ordering information model order number package description specified temperature range package option marking information SGM3135 SGM3135yn6g/tr sot-23-6 -40c to +85c tape and reel, 3000 s04xx note: order number and package mark ing are defined as the follow: order number SGM3135 x x g / tr package type green product tape and reel n6 sot-23-6 operating temperature range y -40 to +85 marking information for example: s049a (2009 year, the 1st month) s04 x x chip produce year ("9" = 2009, "a" = 2010 ) chip produce month ("a" = jan. "b" = feb. "l" = dec.) absolute maximum ratings v cc to gnd ?????.?????..???.?... -0.3v to 6v the other pins to gnd???? ??...???...... -0.3v to 6v storage temperature range...??.???....-65 to +150 junction temperature?????????????......150 operating temperature range?...??....??-40 to +85 power dissipation, p d @ t a = 25 sot-23-6???.???????.??.?..?????.. 0.5w package thermal resistance sot-23-6, ja ??????????..????..?.. 250 /w lead temperature (soldering 10 sec) ?????????????..??????????.. 260 esd susceptibility hbm???????????????...??????4000v mm?????????????..?...??.?????.400v note: stresses beyond those list ed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions 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. caution this integrated circuit can be damaged by esd if you don?t pay attention to esd protecti on. sgmicro recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. sgmicro reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. pl ease contact sgmicro sales office to get the latest datasheet.
3-channel low dropout low side white led driver 3 sg micro corp www.sg-micro.com SGM3135 pin configuration (top view) 1 3 2 6 4 5 led1 led2 led3 v cc gnd en s04xx sot-23-6 note: the location of pin 1 on the s04xx is determined by orienting the package marking as shown. pin description pin name function 1 v cc power input. 2 gnd ground. 3 en enable input. (active high). 4 led3 led3 output pin. connect to led3?s cathode. 20ma constant current output. led3 is high impedance when en is low. 5 led2 led2 output pin. connect to led2?s cathode. 20ma constant current output. led2 is high impedance when en is low. 6 led1 led1 output pin. connect to led1?s cathode. 20ma constant current output. led1 is high impedance when en is low.
3-channel low dropout low side white led driver 4 sg micro corp www.sg-micro.com SGM3135 electrical characteristics (v in = 3.7v, t a = +25c, unless otherwise noted.) parameter symbol conditions min typ max units operation voltage range v cc 2.5 5.5 v shutdown supply current i shdn v en < 0.4v 1 a led sink current i led 18 20 22 ma quiescent power supply current i q i led = 0 190 a led dropout voltage i led = 20ma, v led @ i ledn =90% i led 40 90 mv led current deviation matching d led -5 +5 % input high voltage at en v ih v en > v ih for enable ih 1.5 v input low voltage at en v il v en < v il for disable il 0.4 v otp 145 otp hysteresis 10
3-channel low dropout low side white led driver 5 sg micro corp www.sg-micro.com SGM3135 typical performance characteristics led current vs. input voltage 0 5 10 15 20 25 30 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) led current (ma) led1 led2 led3 supply current vs. supply voltage 0 50 100 150 200 250 1.5 2.5 3.5 4.5 5.5 supply voltage (v) supply current ( a) line transient response time (100s/div) v in = 3.2v to 3.7v v in i led 25ma 1v /div 0ma led current vs. temperature 10 15 20 25 30 -40 -15 10 35 60 85 temperature ( ) led current (ma)
3-channel low dropout low side white led driver 6 sg micro corp www.sg-micro.com SGM3135 typical performance characteristics
3-channel low dropout low side white led driver 7 sg micro corp www.sg-micro.com SGM3135 application information enable input drive en high to enable the device; drive en low to force led1, led2 and led3 into a high-impedance state. when driven high, en draws 190a to power the ic. driving en low longer than 3ms will disable the device and the typical supply current will be less than 1a. input uvlo the input operating voltage range of the SGM3135 is 2.5v to 5.5v. an input capacitor at the v cc pin could reduce ripple voltage. it is recommended to use a ceramic 0.1f or larger capacitance as the input capacitor. this ic provides an under-voltage lockout (uvlo) function to prevent it from unstable issue when startup. the uvlo threshold of input rising voltage is set at 2.1v typically with a hysteresis 0.11v. led brightness dimming control for controlling the led brightness, the SGM3135 can perform the dimming control by applying a pwm signal to en pin. when an external pwm signal is applied to the en pin, brightness of white led is adjusted by the duty cycle. the average led current is proportional to the pwm signal duty cycle. the magnitude of the pwm signal must be higher than the minimum level of enable input high level, in order to let the dimming control perform correctly. the suggested pwm frequency range is 20khz to 200hz.
3-channel low dropout low side white led driver 8 sg micro corp www.sg-micro.com SGM3135 package outline dimensions sot-23-6 e e1 e e1 b d a1 a2 a c l 0.2 2.59 0.99 0.95 0.69 recommended land pattern (unit: mm) dimensions in millimeters dimensions in inches symbol min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950 bsc 0.037 bsc e1 1.900 bsc 0.075 bsc l 0.300 0.600 0.012 0.024 0 8 0 8
3-channel low dropout low side white led driver 9 sg micro corp www.sg-micro.com SGM3135 tape and reel information note: the picture is only for reference. please make the object as the standard. key parameter list of tape and reel package type reel diameter reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p0 (mm) p1 (mm) p2 (mm) w (mm) pin1 quadrant sot-23-6 7 9.5 3.17 3.23 1.37 4.0 4.0 2.0 8.0 q3 reel width (w1) reel diameter reel dimensions tape dimensions direction of feed p2 p0 w p1 a0 k0 b0 q1 q2 q4 q3 q3 q4 q2 q1 q3 q4 q2 q1
3-channel low dropout low side white led driver 10 sg micro corp www.sg-micro.com SGM3135 carton box dimensions note: the picture is only for reference. please make the object as the standard. key parameter list of carton box reel type length (mm) width (mm) height (mm) pizza/carton 7 (option) 368 227 224 8 7 442 410 224 18
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