G5642 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 3A Buck Converter

Global Mixed-mode Technology
3A Buck Converter
G5642
Features
„ 4.75V to 20V Supply Voltage Operating Range
„ Fixed 500kHz Switching Frequency
„ Current-Mode Buck PWM Converter
„ Built-in P-Channel Power MOSFET
„ 3A Output Current
„ 1.2V Internal Reference
„ Shutdown Control
„ Thermal-Shutdown and Internal Soft Start
„ Cycle-by-Cycle Current-Limit
„ Short Circuit Protection
„ Under-Voltage Lockout Protection
„ RoHs Compliant
„ SOP-8 (FD) Package
Applications
„ Distributed Power Systems
„ Battery Charger
„ Palmtop Computers, PDAs
„ DSL Modems
Ordering Information
ORDER
NUMBER
G5642F11U
Note: F1: SOP-8 (FD)
1: Bonding Code
U : Tape & Reel
Pin Configuration
MARKING
G5642
General Description
The G5642 is a high efficiency, 3A buck converter with
a high-side low R_DS(ON) switch. It operates from 4.75V
to 20V input voltage range, and provides up to 3A con-
tinuous output current with the output voltage adjust-
able down to 1.2V. Whenever the load is light, the
G5642 automatically change the PWM operation
mode to PFM operation to minimize the power con-
sumption. Hence it is suitable for battery-powered de-
vices.
It uses a fixed switching frequency up to 500kHz.
When a short circuit is detected on the output, the de-
vice change switching frequency to 50kHz to protect
IC from damage.
The G5642 is available in a SOP-8 (FD) package.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
SOP-8 (FD)
Typical Application Circuit
IN 1
G5642
8 NC
EN 2
COMP 3
Thermal
Pad
7 LX
6 GND
FB 4
5 NC
SOP-8 (FD)
VIN
5V~18V
C_C2
optional
G5642
IN
LX
10µF
OFF _ON ^EN
COMP
FB
C_C
GND
R_C
L
D1
SS34
R1
R2
VOUT
COUT
MLCC
VIN
5V~18V
C_C2
optional
G5642
IN
LX
10µF
OFF _ON ^EN
COMP
FB
C_C
GND
R_C
L
D1
SS34
R1
R2
VOUT
0.1µF
COUT
Electrolytic
( ) ^R1
VOUT = 1.2V x 1 +
R2
* Refer to Table 1 & Table 2 for Component Selection
Ver: 0.9
Mar 06, 2012
TEL: [phone]
http://www.gmt.com.tw
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