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G5723 Schematic ( PDF Datasheet ) - Global Mixed-mode Technology

Teilenummer G5723
Beschreibung Synchronous Buck Converter
Hersteller Global Mixed-mode Technology
Logo Global Mixed-mode Technology Logo 




Gesamt 5 Seiten
G5723 Datasheet, Funktion
Global Mixed-mode Technology Inc.
G5723
Synchronous Buck Converter with Low-Noise LDO
Regulator
Features
Buck Converter
„ High Efficiency: Up to 95%
„ Low Quiescent Current: Only 50µA During Op-
eration
„ Internal Soft Start Function
„ 600mA Output Current
„ 2.5V to 6V Input Voltage Range
„ 1.2MHz 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
LDO Regulator
„ Ultra Low Output Noise 30µV (rms)
„ Ultra Low 55µA No-Load Supply Current
„ Ultra Low Dropout 70mV @ 50mA Load
„ Guarantee 300mA Output Current
„ Fixed Mode: 3V
„ Max. Supply Current in Shutdown Mode < 1µA
„ Stable with Low Cost Ceramic Capacitors
„ Over Temperature Protected
„ RoHS Compliant
Applications
„ Digital Still and Video Cameras
„ MP3 Players
„ Portable Instruments
General Description
The G5723 consists of a synchronous step-down
DC/DC converter and a low-noise LDO regulator. The
DC/DC converter is operated on current mode archi-
tecture. Switching frequency is set at 1.2MHz allowing
the use of small surface mount inductor and capacitor.
The internal synchronous switches increase efficiency
and eliminate the need for external Schottky diode. It
is ideal for system powered by a 1-cell Li-ion battery.
Ordering Information
ORDER
NUMBER
G5723-30P71U
G5723-33P71U
Note: P7: MSOP-10
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G5723E
G5723F
VOLTAGE
3.0V
3.3V
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Pb free)
MSOP-10
MSOP-10
Typical Application Circuit
EN1 1
AGND 2
FB1 3
AGND 4
EN2 5
G5723
MSOP-10
10 LX
9 PGND
8 IN1
7 OUT2
6 IN2
VIN
3.3~4.2V
BATTERY
CIN1
2.2µF
CIN2
1µF
VOUT1 =
0.6V
(1+
R1
R2
)
G5723
IN1 LX
EN1
FB1
IN2
EN2 OUT2
AGND PGND
2.2µH
CFB* (option)
R1
R2 18K
18K
VOUT2
COUT2
4.7µF
VOUT1
1.2V
600mA
COUT1
10µF
Ver: 0.1
Jan 15, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
1





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