G5139 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Boost White LED Driver with PWM Brightness Control in 2mm x 2mm TDFN Package

Global Mixed-mode Technology Inc.
G5139
Boost White LED Driver with PWM Brightness
Control in 2mm x 2mm TDFN Package
Features
„ 2.7V to 7V Input Voltage Range
„ 600kHz Operating Frequency
„ 38V 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
General Description
The G5139 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. Con-
stant frequency current mode PWM architecture re-
sults in low, predictable output noise. The G5139 in-
cludes cycle-by-cycle 700mA current limit to maximize
inductor current and over-temperature protection cir-
cuit. The over-voltage protection will be enabled when
VOUT exceeds 38V. The current of LED is set by a
resistor connected between FB and GND. The G5139
is available in TDFN2X2-6 package.
Ordering Information
ORDER
NUMBER
G5139RBBU
G5139RBBD
Note: RB : TDFN2X2-6
B : Bonding Code
U & D: Tape & Reel
MARKING
5139
5139
TEMP.
RANGE
-40°C to 85°C
-40°C to 85°C
PACKAGE
(Green)
TDFN2X2-6
TDFN2X2-6
Pin Configuration
Typical Application Circuit
G5139
FB 1
COMP 2
GND 3
Thermal
Pad
6 VIN
5 EN
4 LX
TDFN2X2-6
Note: Recommend connecting the Thermal Pad
to the Ground for excellent power dissipation.
V_IN=2.7V to 7V
C_IN
1µF
220nF
22µH
VIN
LX
COMP
G5139
PWM Dimming
EN
FB
GND
I=20mA ¹⁰
R1
V_OUT
C_OUT
1µF
Ver: 1.2
Nov 03, 2009
TEL: [phone]
http://www.gmt.com.tw
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