G5129

G5129
Global Mixed-mode Technology Inc.
Boost White LED Driver with PWM Brightness
Control in 2mm x 2mm TDFN Package
Features
General Description
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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.
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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