G5129 Global Mixed-mode Technology Inc. Boost White LED Driver with PWM Brightness Control in 2mm x 2mm TDFN Package Features General Description The G5129 boost converter contains a 0.46Ω internal switch. The IC operates at constant frequency 600 kHz, allowing the use of tiny, low cost and low height inductors and capacitors. The IC operates from a 2.7V to 7V supply voltage. High inrush current at start-up is eliminated using large compensation capacitor. Constant frequency current mode PWM architecture results in low, predictable output noise. The G5129 includes cycle-by-cycle 700mA current limit to maximize inductor current and over-temperature protection circuit. The over-voltage protection will be enabled when VOUT exceeds 26V. The current of LED is set by a resistor connected between FB and GND. The G5129 is available in TDFN2X2-6 package. 2.7V to 7V Input Voltage Range 600kHz Operating Frequency 26V High Output Voltage Over-Voltage Protection 5kHz to 100kHz PWM Brightness Control Built-in Cycle-by-Cycle Current Limit 0.2V Low Reference Voltage TDFN2X2-6 Package Applications Cellular Phone LED Module Compact Back Light Module Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5129RBBU G5129RBBD 5129 5129 -40°C to 85°C -40°C to 85°C TDFN2X2-6 TDFN2X2-6 Note: RB : TDFN2X2-6 B: Bonding Code U & D: Tape & Reel Pin Configuration Typical Application Circuit 22µH VOUT VIN=2.7V to 7V G5129 FB 1 COMP 2 GND 3 Thermal Pad CIN 1µF 6 VIN 5 EN 4 LX VIN COUT 1µF LX COMP 220nF G5129 FB EN PWM Dimming TDFN2X2-6 GND I=20mA Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. 10 R1 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.2 Nov 03, 2009 1