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Global Mixed-mode Technology - 3A Step-down DC/DC

Numéro de référence G5657
Description 3A Step-down DC/DC
Fabricant Global Mixed-mode Technology 
Logo Global Mixed-mode Technology 





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G5657 fiche technique
Global Mixed-mode Technology Inc.
3A Step-down DC/DC
G5657
Features
„ 3A Output Current
„ 0.15Ω Internal Power MOSFET Switch
„ Stable with Low ESR Output Ceramic Capaci-
tors
„ Up to 95% Efficiency
„ 25µA Shutdown Mode
„ Fixed 380kHz Frequency
„ Thermal Shutdown
„ Cycle-by-Cycle Over Current Protection
„ Wide 4.75V to 20V Operating Input Range
„ Output Adjustable from 0.92V to 12V
„ Available in SOP-8(FD) Package
Applications
„ PC Monitors
„ DSL Modems
„ Distributed Power Systems
„ Pre-Regulator for Linear Regulators
General Description
The G5657 is a monolithic step-down switch mode
regulator with a built in internal power MOSFET. It
achieves 3A continuous output current over a wide in-
put supply range with excellent load and line regulation.
Current mode operation provides fast transient re-
sponse ans eases loop stabilization.
Fault condition protection includes cycle-by-cycle cur-
rent limiting, output short circuit protection and thermal
shutdown. In shutdown mode the regulator draws 25µA
of supply current. Programmable soft-start overwrites
the internal soft-start for various requirement of output
power up ramp and minimizes the inrush supply current
at initial startup.
The G5657 requires a minimum number of readily
available standard external components. It is available
in a SOP-8 (FD) package.
Ordering Information
ORDER
NUMBER
G5657F11U
G5657F12U
Note: F1: SOP-8 (FD)
1 & 2: Bonding Code
U : Tape & Reel
Pin Configuration
MARKING
G5657
G5657A
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
SOP-8 (FD)
SOP-8 (FD)
Typical Application Circuit
G5657F11U
SS 1
8 EN
G5657F12U
NC 1
8 SS
NC 2
IN 3
Thermal
Pad
7 COMP IN 2
6 FB
LX 3
Thermal
Pad
7 EN
6 COMP
LX 4
5 GND GND 4
5 FB
SOP-8 (FD)
SOP-8 (FD)
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
VIN
4.75V~20V
CC2
optional
G5657
IN LX
10µF
OFF ON EN
COMP
CC GND
FB
SS
RC
10µH
D1
SS34 R1/62kΩ
R2/24kΩ
0.1µF
VOUT
3.3V/3A
22µF
MLCC
VIN
4.75V~20V
CC2
G5657
IN LX
10µF
OFF ON EN
COMP
CC GND
FB
SS
RC
10µH
D1
SS34 R1/62kΩ
R2/24kΩ
0.1µF
VOUT
3.3V/3A
0.1µF
100µF/220µF
Electrolytic
( )VOUT = 0.92V x
1+
R1
R2
Ver: 0.4
Aug 03, 2009
TEL: 886-3-5788833
http://www.gmt.com.tw
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