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sgm 3131 120 ma 4 - channel charge pump white led driver with low dropout current source january 201 3 C r ev . a . 2 sg micro corp www.sg- micro.com general description the SGM3131 is a high performance white led driver. it integrates current sources and automatic mode selection charge pump. the part maintains the high efficiency by utilizing a 1/ 1.5 fractional charge pump and low dropout current sources. the small equivalent 1 mode open loop resistance and ultra - low dropout voltage of current source extend the operating time of 1 mode and optimize the effi ciency of li -i on batter y in white led applications. the SGM3131 supports up to 4 white leds and regulates a constant current which the initial value can be set by an external resistor. the part implements a 4- bit dac for brightness control. users can easily configure the led current from 0.5 ma to 30 ma by a serial pulse. the dimming of white leds current can be achieved by applying a pulse signal to the en pin. there are totally 16 steps of current could be set by users. the operating voltage range is 2. 7 v to 5. 5 v. internal soft start circuitry effectively reduces the in - rush current while both start - up and mode transition. the load is disconnected from vin while shutdown and the shutdown current is less than 1 a. SGM3131 is available in green tqfn - 33 - 16l package. it operates over an ambient temperature range of - 40 to +85 . features input voltage range: 2.7v to 5.5v drives up to 4 leds at 30ma each led brightness control through single wire interface 16 -s tep brightness c ontrol high efficiency by fractional conversion with 1 and 1.5 modes switching frequency: 1mhz regulated output current with 1% matching internal soft -s tart limits inrush current low input ripple and low emi over -c urrent and over -t emperature protected under -v oltage lockout w ith hysteresis operating temperature range: - 40 to +85 a vailable in green tqfn - 33 - 16l package applications mobile phone, dsc, mp3 white led backlighting lcd display supply a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 2 january 201 3 sg micro corp www.sg- micro.com package/ordering information model package description specified temperature range ordering number package marking packing option SGM3131 tqfn - 33 -16l -40 to +85 SGM3131ytq16g/tr 3131tq xxxxx tape and reel, 3000 note: xxxxx = date code and vendor code. green (rohs & hsf): sg micro corp defines "green" to mean pb - free (rohs compatible) and free of halogen substances. if you have additional comments or questions, please contact your sgmicro representative directly. absolute maximum ratings supply voltage range ......................................... - 0.3v to 6 v the other pins to gnd ........................................ - 0.3v to v in power dissipation, p d @ t a = + 25 tqfn - 33 -16l ............................................................. 1.47w storage temperature range ....................... .-65 to +150 junction temperature ................................................. + 160 operating temperature range ....................... -40 to +85 lead temperature (soldering 10 sec ) ........................ + 260 esd susceptibility hbm ............................................................................. 2000v mm ................................................................................. 200v overstress caution stresses beyond those listed may cause permanent damage to the device. functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. esd sensitivity caution this integrated circuit can be damaged by esd if you dont pay attention to esd protection. 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 su btle 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. disclaimer sg micro corp reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 3 january 201 3 sg micro corp www.sg- micro.com pin configuration (top view) led4 vout 1 2 3 4 5 7 8 9 10 vin pgnd 6 11 12 13 14 15 16 n.c. iset agnd n.c. c2n c1n c2p c1p led3 led1 led2 en gnd tqfn - 3 3 - 16l pin description pin name i/o function 1 iset i connect a resistor between this pin and gnd to set the maximum current through the leds. 2, 16 n.c. - no internal connection. 3, 4, 5, 6 led4 led1 i current sink input. connect the cathode of the white leds to these inputs. 7 pgnd - power ground. 8 vout o connect the output capacitor and the anode of the leds to this pin. 9 c2p - positive terminal of bucket capacitor 2. 10 c1p - positive terminal of bucket capacitor 1. 11 c1n - negative terminal of bucket capacitor 1. 12 c2n - negative terminal of bucket capacitor 2. 13 vin i supply voltage input. 14 agnd - analog ground. 15 en i chip enable (active high), and connects to gpio pin of mcu. exposed pad gnd - exposed pad should be soldered to pcb board and connected to gnd. a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 4 january 201 3 sg micro corp www.sg- micro.com electrical characteristics (v in = 3.6v, en = v in , t a = + 25 , unless otherwise noted.) parameter symbol conditions min typ max units supply voultage and current input voltage range v in 2.7 5.5 v quiescent power supply current i q v in = 4.2v, 1 mode, en = 1, i set = 0a 100 a i q v in = 4.2v, 1 mode, en= 1, i set = 20a 200 a i out = 0ma, 1.5 mode 2 ma shutdown supply current i shdn en = gnd 1 a charge pump stage over -v oltage limit v out led x unconnected, v in = 4.2v 5. 7 v start -up time c out = 1f, i ledx 0.9 i led x-set 235 s soft -s tart duration 220 s switching frequency f 0.6 1 1.4 mhz efficiency v in = 3. 25 v, i led x = 15ma each, v led x = 2.95 v 88 % thermal shutdown temperature temperature rising 150 hysteresis temperature 15 input current limit en = 1, i set = 100a 270 ma current sinks recommended maximum current per current sink i ledx 3.2v v in 5.5v 30 ma current into each current sink when iset is shorted to gnd i ledx 3.0v v in 5.5v, iset shorted to gnd 40 ma current matching between any two outputs v ledx = 3.1v, t a = 25 -3 1 +3 % line regulation 3v < v in < 5.5v, v ledx = 3.1v, en = 1, i set = 80a 2 % reference voltage for current set v iset en = 1 580 600 620 mv recommended iset pin current range i set 2 130 a i led x to i set current ratio k en = 1, i set = 80a 230 260 280 voltage at led x to gnd v source en = 1, i ledx = 30ma 400 mv enable en low time for shut d own t shdn 3 ms en low time for dimming t lo 0.5 500 s en high time for dimming t hi 0.5 s en threshold logic - high voltage v ih 1.2 v logic - low voltage v il 0.6 v a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 5 january 201 3 sg micro corp www.sg- micro.com typical performance characteristics a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 6 january 201 3 sg micro corp www.sg- micro.com typical performance characteristics (continued) efficiency vs. input voltage 40 50 60 70 80 90 100 2.7 3.2 3.7 4.2 4.7 5.2 input voltage (v) efficiency (%) i ledx = 15ma v f = 2.95v i ledx = 25ma v f = 3.05v 5.5 led current regulation vs. input voltage 14 15 16 17 18 19 20 21 22 23 24 25 26 3.2 3.7 4.2 4.7 5.2 input voltage (v) led current (ma) 5.5 a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 7 january 201 3 sg micro corp www.sg- micro.com functional block diagram vin 1/1.5 charge pump uvlo ovp iset vout c1p c1n c2p c2n gate driver led1 led2 led3 led4 16 steps pulse dimming controller soft start shutdown delay gnd 1mhz osc en low dropout current source figure 1 . block diagram a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 8 january 201 3 sg micro corp www.sg- micro.com typical application circuit s + pulse input c in 1f led4 led3 led2 led1 SGM3131 vin en iset agnd pgnd vout li-ion battery c out 1f r set 13 15 8 1 14 3 4 5 6 7 c1p c1n c2p c2n c fly 1f c fly 1f 1011 9 12 figure 2. for 4 - wleds application circuit pulse input led4 led3 led2 led1 SGM3131 en agnd pgnd vout c out 1f 15 8 14 3 4 5 6 7 + c in 1f vin li-ion battery 13 iset r set 1 c1p c1n c2p c2n c fly 1f c fly 1f 1011 9 12 figure 3. for 3 - wleds application circuit a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 9 january 201 3 sg micro corp www.sg- micro.com application information the SGM3131 uses a fractional switched capacitor charge pump to power up to four white leds with a programmable current for uniform intensity. the part integrates current sources and automatic mode selection charge pump. it ma intains the high efficiency by utilizing a 1 /1.5 fractional charge pump and current sources. the small equivalent 1 mode open loop resistance and ultra - low dropout voltage of current source extend the operating time of 1 mode and optimize the efficiency in white led applications. input uvlo the input operating voltage range of the SGM3131 is 2. 7v to 5.5v. an input capacitor at the vin pin could reduce ripple voltage. it is recommended to use a ceramic 1 f 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. 15 v typically with a hysteresis 50mv. soft - start the SGM3131 employs a soft start feature to l imi t the inrush current. the soft -s tart circuit prevents the excessive inrush current and input voltage droop. the soft -s tart clamps the input current over a typical period of 200 s. mode decisio n the SGM3131 uses a smart mode selection method to decide t he working mode for optimizing the efficiency. mode decision circuit senses the output and led voltage for up/down selection. the SGM3131 automatically switches to 1.5 mode whenever the dropout condition is detected from the current source and returns to 1 mode whenever the dropout condition releases . led connection the sgm 3131 supports up to 4 white leds. the four leds are connected from v out to pin 3 , 4 , 5 and 6 respectively ( figure 2) . if the led is not used, the led pin can be connected to gnd or be floating. but the pin led1 is always required to be connected to led load. figure 3 shows the connection for 3 - wleds application . led current adjustment (iset) a resistor programs a reference current, which is current mirrored to set the led current. the 100% current (16/16) in each led is typically 260 times the current through the resistor at iset (see table 1). r set = led iset i v k v iset voltage from iset pin (0.6v) to gnd i led 100% current per led from ledx pin to gnd k ledx to iset current ratio (typically 260 ) the led current varies linearly from 0ma to i led ( 100%) by the single wire interface, totally 16 - step brightness dimming . table 1 . r set values set drive current ( 100% ) r set computation value (k ) standard resistor value ( k ) (1%) 30ma 5.2 5.1 25ma 6.24 6.19 20ma 7.8 7.68 10ma 15.6 15.4 5ma 31.2 30.9 a ll data sheet.com
120 ma 4 - channel charge pump white led sgm 3131 driver with low dropout current sourc e 10 january 201 3 sg micro corp www.sg- micro.com application information (continued) selecting capacitors to get the better performance of SGM3131 , the selection of peripherally appropriate capacitor and value is very important. these capacitors determine some parameters such as input/output ripple voltage, power efficiency, and maximum supply current by charge pump . to reduce the input and output ripple effectively, the low esr ceramic capacitors are recommended. for led driver applications, the input voltage ripple is more important than output rip ple. input ripple is controlled by input capacitor c in , increasing the value of input capacitance can further reduce the ripple. practically, the input voltage ripple depends on the power supply impedance. the flying capacitor s (c fly ) determine the supply current capability of the charge pump and to influence the overall efficiency of system. the lower value will improve efficiency, but it will limit the led's current at low input voltage. for 4 3 0ma load over the entire input range of 2. 7 v to 5.5v, it is recommended to use a 1 f ceramic capacitor on the flying capacitor s. brightness control the sgm 3131 implements a pulse dimming method to control the brightness of white leds. users can easily configure the led current from 0.5 ma to 3 0ma by a serial pulse. the dimming of white leds' current can be achieved by applying a pulse signal to the en pin. there are totally 16 steps of current could be set by users. the detail operation of brightness d imming is showed in the figure 4. en i ledx shutdown 100% 15/16 14/16 13/16 12/16 3/16 2/16 1/16 15/16 100% shutdown 0 1 2 3 4 5 14 15 0 1 30s < t ready 0.5s < t hi 0.5s < t lo < 500s 3ms < t shdn figure 4 . brightness c ontrol by p ulse d imming a ll data sheet.com
package informatio n tx00 0 81.000 sg micro corp www.sg - micro.com package outline dimensions tqfn -33-16l symbol dimensions in millimeters dimensions in inches min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a2 0.203 ref 0.008 ref d 2.900 3.100 0.114 0.122 d1 1.600 1.800 0.063 0.071 e 2.900 3.100 0.114 0.122 e1 1.600 1.800 0.063 0.071 k 0.200 min 0.008 min b 0.180 0.300 0.007 0.012 e 0.500 typ 0.020 typ l 0.300 0.500 0.012 0.020 top view bottom view side view a a2 a1 e e1 b l k d1 d e n1 n5 n16 1.7 1.7 0.7 2.2 3.6 0.5 0.24 recommended land pattern (unit: mm) a ll data sheet.com
package informatio n tx 1 0 000.0 00 sg micro corp www.sg- micro.com 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 dd0001 tqfn - 33 -16l 13 12.4 3.35 3.35 1.13 4.0 8 .0 2.0 12.0 q1 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 a ll data sheet.com
package informatio n tx 2 0 000 .000 sg micro corp www.sg- micro.com 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 dd0002 13 386 280 370 5 a ll data sheet.com

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