G5723 Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – Synchronous Buck Converter with Low-Noise LDO Regulator

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: No External Resistor Network
Needed
„ 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
G5723-18P71U
G5723-30P71U
G5723-33P71U
Note: P7: MSOP-10
1: Bonding Code
U: Tape & Reel
Pin Configuration
MARKING
G5723G
G5723E
G5723F
VOLTAGE
1.8V
3.0V
3.3V
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
MSOP-10
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
V_IN
3.3~4.2V
BATTERY
C_IN1
2.2µF
C_IN2
1µF
R1
V_OUT1 = 0.6V × (1+ _R2 )
G5723
IN1
LX
EN1
FB1
IN2
EN2
OUT2
AGND PGND
2.2µH
C_FB* (option)
R1
R2 _18K
18K
V_OUT2
COUT2
4.7µF
V_OUT1
1.2V
600mA
C_OUT1
10µF
Ver: 0.4
Aug 30, 2010
TEL: [phone]
http://www.gmt.com.tw
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