G5640 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 2.5A Buck Converter

Global Mixed-mode Technology Inc.
2.5A Buck Converter
G5640
Features
„ 4.75V to 20V Supply Voltage Operating Range
„ Fixed 500kHz Switching Frequency
„ Current-Mode Buck PWM Converter
„ Built-in P-Channel Power MOSFET
„ 2.5A 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
„ SOP-8 Package
Applications
„ Distributed Power Systems
„ Battery Charger
„ Palmtop Computers, PDAs
„ DSL Modems
Ordering Information
ORDER
NUMBER
G5640P11U
Note: P1: SOP-8
1: Bonding Code
U : Tape & Reel
Pin Configuration
MARKING
G5640
General Description
The G5640 is a high efficiency, 2.5A 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
2.5A continuous output current with the output voltage
adjustable down to 1.2V. Whenever the load is light,
the G5640 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 G5640 is available in a SOP-8 package.
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Green)
SOP-8
Typical Application Circuit
IN 1
EN 2
COMP 3
FB 4
G5640
SOP-8
8 NC
7 LX
6 GND
5 NC
VIN
5V~18V
C_C2
optional
G5640
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
G5640
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: 0.8
May 25, 2010
TEL: [phone]
http://www.gmt.com.tw
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