GMT G5640

G5640
Global Mixed-mode Technology Inc.
2.5A Buck Converter
General Description
Features
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The G5640 is a high efficiency, 2.5A buck converter
with a high-side low RDS(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 consumption. Hence it is suitable for battery-powered devices.
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
It uses a fixed switching frequency up to 500kHz.
When a short circuit is detected on the output, the device change switching frequency to 50kHz to protect
IC from damage.
Applications
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The G5640 is available in a SOP-8 package.
Distributed Power Systems
Battery Charger
Palmtop Computers, PDAs
DSL Modems
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Green)
G5640P11U
G5640
-40°C to +85°C
SOP-8
Note: P1: SOP-8
1: Bonding Code
U : Tape & Reel
Pin Configuration
Typical Application Circuit
G5640
VIN
5V~18V
CC2
optional
G5640
IN
1
8
NC
EN
2
7
LX
COMP
3
6
GND
FB
4
5
10µF
OFF ON EN
COMP
GND
CC
SOP-8
CC2
optional
D1
SS34
R1
VOUT
COUT
MLCC
FB
R2
RC
G5640
VIN
5V~18V
NC
L
LX
IN
IN
10µF
OFF ON EN
COMP
CC
GND
L
LX
D1
SS34
VOUT
R1
0.1µF
R2
COUT
Electrolytic
FB
RC
VOUT = 1.2V x ( 1 +
R1
R2
)
* Refer to Table 1 & Table 2 for Component Selection
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.8
May 25, 2010
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