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G5121 Datasheet(PDF) 1 Page - Global Mixed-mode Technology Inc |
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G5121 Datasheet(HTML) 1 Page - Global Mixed-mode Technology Inc |
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1 / 10 page  Ver: 1.3 Nov 13, 2006 TEL: 886-3-5788833 http://www.gmt.com.tw 1 G5121 Global Mixed-mode Technology Inc. Fixed Frequency White LED Step-Up Converter Features Inherently Matched LED Current High Efficiency: 87% Drives Up to Five LEDs from 2.5V Supply 24V Internal Power Switch Fast 1MHz Switching Frequency Uses Tiny 1mm Tall Inductors Requires Only 1µF Output Capacitors 19.5V Over Voltage Protection SOT-23-6 and TSOT-23-6 Package Applications White LED Backlight Display for PDA Pocket PC Smart Phones Handheld Devices Cellular Phones General Description The G5121 is a step-up DC/DC converter specifically designed to drive up to 5 series white LEDs with con- stant current. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminates the need for ballast resistors. The G5121 switches at 1MHz, allowing the use of tiny ex- ternal components. A low 0.254V feedback voltage minimizes power loss in the current setting resistor for high efficiency. The OVP pin monitors the output volt- age and turns off the converter whenever the LEDs are open. The G5121 is available in low profile SOT-23-6 and TSOT-23-6 package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Pb free) G5121TB1U 5121x -40°C ~ +85°C SOT-23-6 G5121TP1U 5121x -40°C ~ +85°C TSOT-23-6 Note:TB: SOT23-6 TP: TSOT-23-6 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit VCC SHDN SOT-23-6/TSOT-23-6 6 4 1 SW 2 3 GND FB 5 OVP VCC SW SHDN FB GND G5121 L1 V IN 2.7V to 4.2V D1 OVP 5 LEDs PWM Dimming Waveform RS C1 4.7µF/6.3V 4.7µH C2 1µF/25V C1:TAIYO YUDEN, JMK212BJ475KD C2:TAIYO YUDEN, TMK316BJ105KD G5121 VCC SHDN SOT-23-6/TSOT-23-6 6 4 1 SW 2 3 GND FB 5 OVP VCC SW SHDN FB GND G5121 L1 V IN 2.7V to 4.2V D1 OVP 5 LEDs PWM Dimming Waveform RS C1 4.7µF/6.3V 4.7µH C2 1µF/25V C1:TAIYO YUDEN, JMK212BJ475KD C2:TAIYO YUDEN, TMK316BJ105KD G5121 |
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