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G5725 Datasheet(PDF) 1 Page - Global Mixed-mode Technology Inc

Part # G5725
Description  1MHz 1A Synchronous Step-Down Regulator
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Manufacturer  GMT [Global Mixed-mode Technology Inc]
Direct Link  http://www.gmt.com.tw
Logo GMT - Global Mixed-mode Technology Inc

G5725 Datasheet(HTML) 1 Page - Global Mixed-mode Technology Inc

  G5725 Datasheet HTML 1Page - Global Mixed-mode Technology Inc G5725 Datasheet HTML 2Page - Global Mixed-mode Technology Inc  
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Ver: 1.0
May 04, 2012
TEL: 886-3-5788833
http://www.gmt.com.tw
1
G5725
Global Mixed-mode Technology
1MHz 1A Synchronous Step-Down Regulator
Features
High Efficiency: Up to 93%
Low Quiescent Current: Only 50µA During Op-
eration
Internal Soft Start Function
1A Output Current
2.5V to 6V Input Voltage Range
1MHz Switching Frequency
No Schottky Diode Required
100% Duty Cycle in Dropout Operation
0.6V Reference Allows Low Output Voltages
<1µA Shutdown Current
Current Mode Operation for Excellent Line and
Load Transient Response
Over Temperature Protected
RoHS Compliant
Applications
Cellular Telephones
Personal Information Appliances
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
Digital Still and Video Cameras
MP3 Players
Portable Instruments
General Description
The G5725 is a high efficiency monolithic synchronous
buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 50µA and drops to <1µA in shutdown. The 2.5V
to 6V input voltage range makes the G5725 ideally
suited for single Li-Ion battery-powered applications.
100% duty cycle provides low dropout operation, ex-
tending battery run time in portable systems. Switching
frequency is internally set at 1MHz, allowing the use of
small surface mount inductors and capacitors. The
internal synchronous switch increase efficiency and
eliminates the need for an external Schottky diode.
Built-in soft start function eliminates in-rush current
that could damage the system.
Pin Configuration
Typical Application Circuit
VFB
VIN
SOT-23-5/TSOT-23-5
5
4
1
EN
2
3
GND
LX
G5725
VIN
LX
EN
VFB
GND
G5725
C
IN
2.2µF
CER
V
IN
4~6V
1
43
5
2.2µH
C
FB
R1
82k
R2
18k
C
OUT
10µF
CER
V
OUT
3.3V
300mA
* (option)
V
OUT = 0.6V × (1+
)
R1
R2
2
VFB
VIN
SOT-23-5/TSOT-23-5
5
4
1
EN
2
3
GND
LX
G5725
VIN
LX
EN
VFB
GND
G5725
C
IN
2.2µF
CER
V
IN
4~6V
1
43
5
2.2µH
C
FB
R1
82k
R2
18k
C
OUT
10µF
CER
V
OUT
3.3V
300mA
* (option)
V
OUT = 0.6V × (1+
)
R1
R2
V
OUT = 0.6V × (1+
)
R1
R2
2


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