Global Mixed-mode Technology Inc.
G5138
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：40V
Shutdown Current：<1µA
Over-Voltage Protection
Digital Dimming Control
Built-in Cycle-by-Cycle Current-Limiting
Soft-Start Function
0.3V Low Reference Voltage
SOT-23-6 & TSOT-23-6 Package
General Description
The G5138 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 G5138 includes
cycle-by-cycle 1.2A current limiting to maximum in-
ductor current and over-temperature protection circuit.
The over-voltage protection will be enabled when
VOUT exceeds 40V. The current of LED is set by a
resistor connected between FB and GND. The G5138
is available in SOT-23-6 & TSOT-23-6 package.
Applications
LED Module
Compact Back Light Module
Constant Current Source
Ordering Information
ORDER
NUMBER
G5138TB1U
G5138TP1U
MARKING
5138x
5138x
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
(Pb free)
SOT-23-6
TSOT-23-6
Note: TB: SOT-23-6 TP: TSOT-23-6
1 : Bonding Code
U: Tape & Reel
Pin Configuration
Typical Application Circuit
22µH
G5138
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
G5138
FB
GND
I=20mA
15
R1
PWM Dimming
FB
3
4
EN
SOT-23-6/TSOT-23-6
Ver: 0.1
Jun 11, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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