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PDF G5644 Data sheet ( 特性 )

部品番号 G5644
部品説明 2.5A Buck Converter
メーカ Global Mixed-mode Technology
ロゴ Global Mixed-mode Technology ロゴ 

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G5644 Datasheet, G5644 PDF,ピン配置, 機能
Global Mixed-mode Technology Inc.
2.5A Buck Converter
G5644
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
„ 0.8V 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
Pin Configuration
General Description
The G5644 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 0.8V. Whenever the load is light,
the G5644 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 G5644 is available in a SOP-8 package.
Ordering Information
ORDER
NUMBER
MARKING
G5644P11U
G5644
Note: P1: SOP-8
1: Bonding Code
U : Tape & Reel
TEMP.
RANGE
-40°C to +85°C
PACKAGE
(Pb free)
SOP-8
Typical Application Circuit
IN 1
EN 2
COMP 3
FB 4
G5644
SOP-8
8 NC
7 LX
6 GND
5 NC
V IN
5 V~18V
CC2
opt io nal
G5644
IN
10µ F
OFF ON
CC
1.5nF
RC
20kΩ
EN
COMP
GND
LX
FB
4. 7µ H
D1
SS34 R1/3kΩ
R2/ 12 kΩ
VOUT
1V / 2. 5A
47 µF
MLCC
V IN
5 V~18V
CC2
1 0p F
G5644
IN LX
10µ F
OFF ON EN
CC
47 0pF
COMP
GND
RC
60kΩ
FB
( )R1
V OUT = 0 .8 V x
1+
R2
4. 7µ H
D1
SS34 R1/3kΩ
R2/ 1 2kΩ
VOUT
1V / 2. 5A
0 .1 µF
100 µF/ 22 0µ F
Electr olytic
Ver: 0.1
Sep 05, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
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