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SGM3131 120ma 4-channel charge pump white led driver with low dropout current source 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 efficiency of li-ion battery 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 0.5ma to 30ma 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 2.7v to 5.5v. 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-step brightness control ? high efficiency by fractional conversion with 1 and 1.5 modes ? switching frequency: 1mhz ? regulated output current with 1% matching ? internal soft-start limits inrush current ? low input ripple and low emi ? over current and over temperature protected ? under voltage lockout with hysteresis ? operating temperature range: -40 to +85 ? available in green tqfn-33-16l package applications mobile phone, dsc, mp3 white led backlighting lcd display supply rev. a . 2 sg micro corp www.sg-micro.com
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 2 sg micro corp www.sg-micro.com package/ordering information model order number package description specified temperature range package option marking information SGM3131 SGM3131ytq16g/tr tqfn-33-16l -40 to +85 tape and reel, 3000 3131tq absolute maximum ratings supply voltage?????????..??? ?....-0.3v to 6.0v the other pins to gnd??????....?..??.?-0.3v to v in power dissipation, p d @ t a = +25 tqfn-33-16l??????????.?.?..?.???1.47w storage temperature ra nge?.???..?......-65 to +150 junction temperature?????.??..??????...160 operating temperature range????...?? -40 to +85 lead temperature (soldering 10 sec) ??????????????????????..?...260 esd susceptibility hbm???????????.?..?.?....?...?.??.. 2000v mm??????????.????..??.?..?..??.. 200v note: stresses beyond those listed 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 s pecifications 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 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 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 rela ted things if necessary without notice at any time. please contact sgmicro sales office to get the latest datasheet.
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 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 tqfn-3x3-16l c2p c1p led3 led1 led2 en gnd pin description pin name i/o function 1 iset i connect a resistor between this pin and gn d 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), an d connects to gpio pin of mcu. exposed pad gnd - exposed pad should be soldered to pcb board and connected to gnd.
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 4 sg micro corp www.sg-micro.com function 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
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 5 sg micro corp www.sg-micro.com electrical characteristics (v in = 3.6v, en = v in , t a = +25c, unless otherwise noted.) parameter symbol conditions min typ max units supply voultage and current input voltage range v in 2.7 5.5 v i q v in = 4.2v, 1 mode, en = 1, i set = 0 a 100 a v in = 4.2v, 1 mode, en= 1, i set = 20 a 200 a quiescent power supply current i q i out = 0ma, 1.5 mode 2 ma shutdown supply current i shdn en = gnd 1 a charge pump stage overvoltage limit v out ledx unconnected, v in = 4.2v 5.7 v startup time c out = 1 f, i ledx 0.9 i ledx-set 235 s soft-start duration 220 s switching frequency f 0.6 1 1.4 mhz efficiency v in = 3.25v, i ledx = 15ma each, v ledx =2.95v 88 % thermal shutdown temperature temperature rising 150 c hysteresis temperature 15 c input current llimit en = 1, i set = 100 a 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 = 80 a 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 ledx to i set current ratio k en = 1, i set = 80 a 230 260 280 voltage at ledx to gnd v source en = 1, i ledx = 30ma 400 mv enable en low time for shutdown 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 logic-high voltage v ih 1.2 v en threshold logic-low voltage v il 0.6 v
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 6 sg micro corp www.sg-micro.com typical performance characteristics
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 7 sg micro corp www.sg-micro.com typical performance characteristics 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
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 8 sg micro corp www.sg-micro.com typical application + pulse input c in 1 f 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 1 f c fly 1 f 10 11 9 12 figure 1. 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 1 f vin li-ion battery 13 iset r set 1 c1p c1n c2p c2n c fly 1 f c fly 1 f 10 11 9 12 figure 2. for 3-wleds application circuit
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 9 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 maintains 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 2.15v typically with a hysteresis 50mv. soft-start the SGM3131 employs a soft start feature to limit the inrush current. the soft-start circuit prevents the excessive inrush current and input voltage droop. the soft-start clamps the input current over a typical period of 200 s. mode decision the SGM3131 uses a smart mode selection method to decide the 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 SGM3131 supports up to 4 white leds. the four leds are connected from vout to pin 3, 4, 5 and 6 respectively (figure 1). 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 2 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. 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 table 1. r set values
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 10 sg micro corp www.sg-micro.com application information 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 ripple. 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 capacitors (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 30ma load over the entire input range of 2.7v to 5.5v, it is recommended to use a 1 f ceramic capacitor on the flying capacitors. brightness control the SGM3131 implements a pulse dimming method to control the brightness of white leds. users can easily configure the led current from 0.5ma to 30ma 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 dimming is showed in the figure 3. 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 30 s < t ready 0.5 s < t hi 0.5 s < t lo < 500 s 3ms < t shdn figure 3. brightness control by pulse dimming
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 11 sg micro corp www.sg-micro.com package outline dimensions tqfn-33-16l 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) dimensions in millimeters dimensions in inches symbol 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
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 12 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 tqfn-33-16l 13 12.40 3.35 3.35 1.13 4.00 4.00 2.00 12.00 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
120ma 4-channel charge pump white led SGM3131 driver with low dropout current source 13 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 13 386 280 370 5

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