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SGM3144 6-channel pwm dimming charge pump white led driver general description the SGM3144 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 SGM3144 supports up to 6 white leds and regulates a constant current which the initial value can be set by an internal resistor. the part implements pwm dimming to adjust the brightness of led. users can easily configure the led current from 0ma to 27ma by a digital pwm signal. SGM3144 can be turned off by en pin. 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 SGM3144 is available in green tqfn-33-16l package and is rated over the -40c to +85c temperature range. features ? input voltage range: 2.7v to 5.5v ? drives up to 6 leds at 27ma each ? pwm dimming ? high efficiency by fractional conversion with 1 and 1.5 modes ? switching frequency: 0.93mhz ? regulated output current with 4.8% matching ? internal soft-start limits inrush current ? low input ripple and low emi ? over-current and over-temperature protection ? under-voltage lockout with hysteresis ? available in green tqfn-33-16l package applications mobile phone, dsc, mp3 white led backlighting lcd display supply rev. a . 1 sg micro corp www.sg-micro.com
6-channel pwm dimming SGM3144 charge pump white led driver 2 sg micro corp www.sg-micro.com package/ordering information model order number package description specified temperature range package option marking information SGM3144 SGM3144ytq16g/tr tqfn-33-16l -40 to +85 tape and reel, 3000 3144tq absolute maximum ratings v in to gnd????????...??.??.....?.?.. -0.3v to 6v 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?????????.?????...150 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 related things if necessary without notice at any time. please contact sgmicro sales office to get the latest datasheet.
6-channel pwm dimming SGM3144 charge pump white led driver 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 led5 led6 agnd en c2n c1n tqfn-33-16l c2p c1p led3 led1 led2 pwm gnd pin description pin name i/o function 1, 2, 3, 4, 5, 6 led6 led1 i current sink input. connect the cathode of the white leds to these inputs. 7 pgnd - power ground. 8 vout o output voltage source. 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 pwm i pwm dimming pulse. duty cycle = 0%, i out = 0ma; duty cycle = 100%, i out = 27ma. 16 en i enable or disable SGM3144. logic high to enable chip, logic low to disable chip. for normal operation, suggest connecting to vin only after the vin has settled if the vin ramping up is slow. exposed pad gnd - exposed pad should be soldered to pcb board and connected to gnd.
6-channel pwm dimming SGM3144 charge pump white led driver 4 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 voltage and current input voltage range v in 2.7 5.5 v i q v in = 4.2v, 1 mode, i ledx = 0ma 155 240 a quiescent power supply current i q 1.5 mode, i ledx = 0ma 1.35 ma shutdown supply current i shdn en = gnd, v in = 4.2v 0.01 2.5 a charge pump stage over-voltage limit v out 5.4 v start-up time c out = 1 f, i ledx 0.9 i ledx-set 280 s soft-start duration 150 s switching frequency f 0.7 0.93 1.25 mhz efficiency at 1 mode before switching to 1.5 mode 90 % shutdown temperature temperature rising 140 shutdown temperature hysteresis 10 input current limit 300 ma current sinks recommended maximum current per current sink i ledx 3.2v v in 5.5v 24 27 30 ma current matching between any two outputs v ledx = 3.2v, i ledx = 27ma -4.8 1 4.8 % line regulation 3.3v < v in < 5.5v, v ledx = 3.2v 1.4 % voltage at led x to gnd v source v in = 4.2v 550 mv pwm and en logic pwm low time for dimming t lo 0.5 s pwm high time for dimming t hi 4 s logic-high voltage v ih 1.2 v threshold logic-low voltage v il 0.4 v threshold of switching between 1 and 1.5 mode 1 mode to 1.5 mode v ledx = 3.2v 3.48 v 1.5 mode to 1 mode v ledx = 3.2v 3.65 v
6-channel pwm dimming SGM3144 charge pump white led driver 5 sg micro corp www.sg-micro.com typical performance characteristics efficiency vs. input voltage 55 65 75 85 95 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 input voltage (v) efficiency (%) v led = 3.2v quiescent current vs. temperature 0.10 0.12 0.14 0.16 0.18 0.20 -55 -35 -15 5 25 45 65 85 105 temperature ( ) quiescent current (ma) v in = 4.2v
6-channel pwm dimming SGM3144 charge pump white led driver 6 sg micro corp www.sg-micro.com typical performance characteristics led current vs. temperature 25.0 25.5 26.0 26.5 27.0 27.5 28.0 -55 -35 -15 5 25 45 65 85 105 temperature ( ) led current (ma) v in = 3.6v led current regulation vs. input voltage 0 9 18 27 36 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 input voltage (v) led current (ma) 5.5 v led = 3.2v switching frequency vs. temperature 0.80 0.85 0.90 0.95 1.00 1.05 1.10 -55 -35 -15 5 25 45 65 85 105 temperature ( ) switching frequency (mhz) led current vs. pwm duty cycle 0 5 10 15 20 25 30 0 20406080100 duty cycle (%) led current (ma) pwm = 1khz pwm = 10khz pwm = 32khz pwm = 50khz
6-channel pwm dimming SGM3144 charge pump white led driver 7 sg micro corp www.sg-micro.com function block diagram 1/1.5 charge pump low dropout current source & pwm control vin vout c1p c1n c2p c2n led1 led2 led3 led4 en led5 led6 pwm soft-start 0.93mhz osc uvlo ovp
6-channel pwm dimming SGM3144 charge pump white led driver 8 sg micro corp www.sg-micro.com typical application li-ion battery + c in 1 f led4 led3 led2 led1 c1p c1n c2p c2n SGM3144 vin en agnd pgnd vout c out 1f 13 8 16 14 7 led5 led6 6 5 4 3 2 1 enable c1 1 f c2 1 f 10 11 912 pwm 15 pwm dimming control figure 1. for 6-wleds application circuit
6-channel pwm dimming SGM3144 charge pump white led driver 9 sg micro corp www.sg-micro.com application information the SGM3144 uses a fractional switched capacitor charge pump to power up to 6 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 SGM3144 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 30mv. soft-start the SGM3144 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 150 s. mode decision the SGM3144 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 SGM3144 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. chip enable and shutdown when en is in ?high? status, SGM3144 will enter into active status. when en is in ?low? status and SGM3144 will enter into shutdown status. over-voltage protection the SGM3144 equips over-voltage protection function. when led1 is open, the output voltage will be clamped to 5.4v. led connection the SGM3144 supports up to 6 white leds. the 6 leds are connected from vout to pin 1, 2, 3, 4, 5 and 6 respectively. figure 1 shows the connection for 6-wleds application. led1 to led6 are controlled by en pin. the SGM3144 internal current source reference circuit bases feedback from current sensed on the led1 output. for best operation, the only requirement for this type of application is the output led1 should always be connected to the load circuit. ? the other led pins (led2, 3, 4, 5 & 6) can be left floating if those white leds are not used. led dimming control interface an internal resistor sets the maximum led current to be 27ma. one pwm signal at pwm pin can dim the brightness of led from 0ma to 27ma. when duty cycle = 0%, the current is 0ma; when duty cycle = 100%, the current is 27ma. selecting capacitors to get the better performance of SGM3144, 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 ripp le 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 c1 and c2 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 6 27ma 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 capacitor c1 and c2.
6-channel pwm dimming SGM3144 charge pump white led driver 10 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
6-channel pwm dimming SGM3144 charge pump white led driver 11 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
6-channel pwm dimming SGM3144 charge pump white led driver 12 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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