Global Mixed-mode Technology Inc.
G5126
High Efficiency, Constant Current, Boost DC/DC
White-LEDs Drive
Features
Operating Voltage：2.7V to 5.5V
High Operating Frequency：1MHz
High Output Voltage：28V
Shutdown Current：<1µA
Over-Voltage Protection
Digital Dimming Control
Built-in Cycle-by-Cycle Current-Limiting
Soft-Start Function
0.2V Low Reference Voltage
Tiny SOT-23-6 Package
General Description
The G5126 boost converter contains a 0.7Ω internal
switch. The IC operates at constant frequency 1MHz,
allowing the use of tiny, low cost and low height in-
ductors and capacitors. The IC operates from a 2.7V
to 5.5V supply voltage. High inrush current at start-up
is eliminated using the soft-start function. Constant
frequency current mode PWM architecture results in
low, predictable output noise. The G5126 includes
cycle-by-cycle 850mA current limiting to maximum
inductor current and over-temperature protection cir-
cuit. The over-voltage protection will be enabled when
VOUT exceeds 28V. The current of LED is set by a
resistor connected between FB and GND. The G5126
is available in SOT-23-6 package.
Applications
LED Module
Compact Back Light Module
Constant Current Source
Ordering Information
ORDER
NUMBER
G5126TB1U
MARKING
5126x
TEMP.
RANGE
-40°C to 85°C
PACKAGE
(Pb free)
SOT-23-6
Note: TB: SOT-23-6
1 : Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
10µH
G5126
LX
1
6
IN
V
IN
=2.7V to 5.5V
C
IN
4.7µF
IN
LX
OVP
V
OUT
C
OUT
1µF
GND
2
5
OVP
EN
PWM Dimming
G5126
FB
GND
I=20mA
10
R1
G963
FB
3
4
EN
SOT-23-6
Ver: 0.5
Jan 11, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
