G5126 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – High Efficiency, Constant Current, Boost DC/DC White-LEDs Drive

Global Mixed-mode Technology
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
„ SOT-23-6 & TDFN2X2-8 Package
Applications
„ LED Module
„ Compact Back Light Module
„ Constant Current Source
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 & TDFN2X2-8 package.
Ordering Information
ORDER
NUMBER
G5126TB1U
G5126RC1U
Note: TB: SOT-23-6 RC: TDFN2X2-8
1 : Bonding Code
U: Tape & Reel
MARKING
5126x
5126
Pin Configuration
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
(Green)
SOT-23-6
TDFN2X2-8
Typical Application Circuit
G5126
G5126
LX 1
GND 2
FB 3
G963
6 IN
VCC 1
NC 2
5 OVP
OVP 3
4 EN
EN 4
Thermal
Pad
8 LX
7 PGND
6 VSS
5 FB
SOT-23-6
TDFN2X2-8
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
V_IN=2.7V to 5.5V
C_IN
4.7µF
10µH
IN
LX
OVP
G5126
PWM Dimming
EN
FB
GND
I=20mA ¹⁰
R1
C_OUT
1µF
Ver: 0.7
Mar 01, 2013
TEL: [phone]
http://www.gmt.com.tw
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