Global Mixed-mode Technology Inc. G5920/G5921 Ultra Low-Dropout, Constant-Current White LED Bias Features General Description Ultra Low 150mV Dropout at 20mA 0.6% High Accuracy Current Matching 20mA Full Scale Current 32 Level Linear Current Brightness Control PWM Brightness Control 2.5V to 5.5V Supply Voltage Range SOT-23-6 Package (G5920) MSOP-8 Package (G5921) The G5920/G5921 is a high performance ultra lowdropout constant current bias supply for white LEDs. It can be used as an alternative to the simple ballast resistors in conventional parallel white LEDs applications. Each white LED bias current is matching to 0.6%. For dimming control, an enable input pin is controlled by processor GPIO output pulses for 32 level linear current. Using a low frequency PWM waveform to this enable input pin also controls the average LED current which is proportional to the PWM duty. Applications Mobile Phones White LED backlighting The G5920/G5921 is suitable for single cell Li-ion battery power device that using low forward voltage white LEDs. The white LEDs can be powered directly from battery without extra external components. This takes an advantage of highest efficiency and creates no EMI problem. Ordering Information ORDER NUMBER ORDER NUMBER (Pb free) MARKING TEMP. RANGE PACKAGE G5920TB1U G5921P8U G5920TB1Uf G5921P8Uf 5920x 5921x -40°C to 85°C -40°C to 85°C SOT-23-6 MSOP-8 Note:TB : SOT23-6 P8: MSOP-8 U: Tape & Reel Pin Configuration Typical Application Circuit G5920 G5920 Linear Current Dimming LED2 1 6 LED1 GND 2 5 VCC LED1 EN LED2 LED3 GND 4 EN LED3 3 VCC 0.1µF SOT-23-6 G5921 G5920 PWM Dimming LED2 1 8 GND LED1 2 7 LED4 LED2 VCC 3 6 LED3 LED3 N.C. 4 5 EN EN GND LED1 VCC 0.1µF MSOP-8 VBAT VBAT TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 1 Global Mixed-mode Technology Inc. G5920/G5921 Absolute Maximum Ratings VCC to GND……………………………….-0.3V to +7.0V EN, LED1, LED2, LED3 to GND..…-0.3V to VCC+0.3V Operating Temperature Range….…….……-40 to 85°C Junction Temperature…………………..…………125°C Storage Temperature……………………-65°C to 150°C Reflow Temperature (soldering, 10sec)…...……260°C Stress beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device. Electrical Characteristics VCC = VEN = 3.6V, TA = 25°C PARAMETER CONDITION MIN TYP MAX UNIT Input Voltage Range VCC 2.5 --- 5.5 V Quiescent Current IQ --- 180 230 µA Shutdown Current IQ(OFF), VEN = 0V -1 --- +1 µA Input Voltage UVLO Threshold VUVLO --- 2 --- V Output Current Max ILED 18 20 22 mA Output Current Line Regulation VLED = 0.5V~2V -0.5 --- +0.5 %/V Current Matching VLED = 0.5V -4 ±0.6 +4 % LED Pin Voltage Dropout VLED(DROP), 90% Max ILED --- --- 0.15 V EN Pin Input Voltage High VIH 2 --- --- V EN Pin Input Voltage Low VIL --- --- 0.8 V EN Pin Input Current IEN -1 --- +1 µA EN Pin Off Timeout TOFF 40 80 200 µS EN Pin End of Pulse Timeout TEOP 40 80 200 µS EN Pin Pulse High Time THIGH 5 --- 30 µS EN Pin Pulse Low Time TLOW 5 --- 30 µS TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 2 G5920/G5921 Global Mixed-mode Technology Inc. Typical Performance Characteristics VCC =VEN =3.6V, VLED=0.5V, T=25°C, unless otherwise noted. PWM Diming Waveform Linear Dimming Waveform I Vbat=4.2V Vbat=4.2V EN EN ILED(20mA/div) ILED(20mA/div) VLED VLED Linear Dimming Waveform II Input Voltage UVLO Vbat=4.2V EN ILED(20mA/div) VLED Quiescent Current vs. VCC Quiescent Current vs. Temperature 250 Quiescent Current IQ(µA) Quiescent Current IQ(µA) 250 200 150 100 50 200 150 100 50 0 0 -50 -25 0 25 50 75 2.5 100 3 3.5 4 4.5 5 VCC(V) Temperature (°C) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 3 G5920/G5921 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) ILED vs. VCC ILED vs. Temperature 20.04 20.01 20 19.99 20 19.98 ILED(mA) ILED (mA) 19.96 19.92 19.97 19.96 19.95 19.94 19.88 19.93 19.92 19.84 19.91 2.5 19.8 -50 -25 0 25 50 Temperature (°C) 75 3 3.5 4 VCC(V) 100 4.5 5 1.7 2 ILED vs. VLED ILED vs. Code 20.20 25 20.15 20.10 20.05 15 ILED(mA) ILED(mA) 20 10 20.00 19.95 19.90 5 19.85 19.80 0 0 10 20 30 0.5 40 0.8 Code 1.4 VLED (V) Current Match vs. Vcc Current Match vs. Temperature 1.0 1.0 LED1 LED1 0.5 Current Match (%) Current Match(%) 1.1 LED2 0.0 LED3 -0.5 0.5 LED2 0.0 LED3 -0.5 -1.0 -1.0 -50 -25 0 25 50 Temperature (°C) 75 2.5 100 3 3.5 4 VCC (V) 4.5 5 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 4 G5920/G5921 Global Mixed-mode Technology Inc. Typical Performance Characteristics (continued) Current Match vs. Code Current Match vs. VLED 1.0 4 LED1 2 LED2 Current Match (%) Current MAtch(%) 3 LED1 1 0 -1 LED3 -2 0.5 LED2 0.0 LED3 -0.5 -3 -4 -1.0 0 5 10 15 20 25 30 35 0.5 Code 0.75 1 1.25 1.5 VLED (V) 1.75 2 ILED vs. Vbat 25 LED using NICHIA 20 ILED(mA) Code=0 15 Code=8 10 Code=16 5 Code=24 0 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 5 Vbat(V) Recommend Minimum Footprint SOT-23-6 MSOP-8 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 5 G5920/G5921 Global Mixed-mode Technology Inc. Pin Descriptions PIN G5920 SOT-23-6 G5921 MSOP-8 NAME FUNCTION 1 2 1 8 LED2 GND LED2 bias current input. Ground. 3 4 6 5 LED3 EN LED3 bias current input. Enable Dimming control. 5 6 3 2 7 VCC LED1 LED4 Power supply. LED1 bias current input. LED4 bias current input. 4 N.C. Not Connected. Block Diagram VBAT 0.1µF LED1 VCC EN LED2 LED3 Current Control GND TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 6 Global Mixed-mode Technology Inc. G5920/G5921 Function Description G5920/G5921 LED pins act as well matched current source driving LED diode to ground. An EN pin is used to turn on and turn off G5920/G5921. When applying a lower frequency (less than 2kHz) PWM waveform to EN pin, the average LED current will be duty*20mA(typical). Refer to Fig.1 ON duty EN TEOP TEOP TOFF ILED ON duty 20mA (Code=0) Fig.1 Turn ON to PWM dimming LED current, typically 20mA. Whenever input N negative pulses to the EN pin, it will get a LED current corresponding to Code N. In this manner, LED current will changed from previous value to new value after the last pulse for typical 80µs (TEOP). Please refer to Fig.2 If the application is not suitable to apply such a low frequency PWM dimming waveform, this EN pin can be negatively pulsed to set continuous LED current. When no negative pulse is input to EN pin (Code=0), the internal register will latched to set the maximum THIGH EN TEOP TLOW TOFF N negative pulses Code N 31 ILED LED current corresponding to Code N Fig.2 Turn ON and config Code N TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 7 G5920/G5921 Global Mixed-mode Technology Inc. Package Information C D L E H θ1 e1 e A A2 A1 b SOT-23-6 (TB) Package Note: 1. Package body sizes exclude mold flash protrusions or gate burrs 2. Tolerance ±0.1000 mm (4mil) unless otherwise specified 3. Coplanarity: 0.1000mm 4. Dimension L is measured in gage plane SYMBOL MIN DIMENSIONS IN MILLIMETER NOM MAX A A1 A2 1.00 0.00 0.70 1.10 ----0.80 1.30 0.10 0.90 b C 0.35 0.10 0.40 0.15 0.50 0.25 D E 2.70 1.40 2.90 1.60 3.10 1.80 e ----- 1.90(TYP) ----- e1 H L θ1 ----2.60 0.37 0.95 2.80 ------ ----3.00 ----- 1º 5º 9º TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 8 G5920/G5921 Global Mixed-mode Technology Inc. C E E1 L D θ 12° (4X) A2 y e A A1 b MSOP-8 (P8) Package Note: 1. Package body sizes exclude mold flash and gate burrs 2. Dimension L is measured in gage plane 3. Tolerance 0.10mm unless otherwise specified 4. Controlling dimension is millimeter converted inch dimensions are not necessarily exact. 5. Followed from JEDEC MO-137 SYMBOL A A1 A2 b C D E E1 e L y θ MIN. DIMENSION IN MM NOM. MAX. MIN. DIMENSION IN INCH NOM. MAX. 0.81 0.00 0.76 0.28 0.13 2.90 4.80 2.90 ----0.40 ----0º 1.02 ----0.86 0.30 0.15 3.00 4.90 3.00 0.65 0.53 --------- 1.22 0.20 0.97 0.38 0.23 3.10 5.00 3.10 ----0.66 0.10 6º 0.032 0.000 0.030 0.011 0.005 0.114 0.189 0.114 ----0.016 ----0º 0.040 ----0.034 0.012 0.006 0.118 0.193 0.118 0.026 0.021 --------- 0.048 0.008 0.038 0.015 0.009 0.122 0.197 0.122 ----0.026 0.004 6º Taping Specification Feed Direction SOT- 23-6 Package Orientation PACKAGE Q’TY/REEL SOT-23-6 3,000 ea MSOP-8 2,500 ea Feed Direction Typical MSOP Package Orientation GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Preliminary Feb 03, 2005 9