G5723B Datasheet, PDF (1/1 Pages) Global Mixed-mode Technology Inc – 1.4MHz 1A Synchronous Buck Converter with 600mA LDO Regulator

Global Mixed-mode Technology
1.4MHz 1A Synchronous
600mA LDO Regulator
Buck
G5723B
Converter with
Features
Buck Converter
„ 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
„ 1.4MHz 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
„ Dropout voltage typically 0.65V @ I_O = 600mA
„ Output current in excess of 600mA
„ Output voltage accuracy ±2%
„ Quiescent current, typically 0.3mA
„ Internal short circuit current limit
„ Internal over temperature protection
Applications
„ Digital Still and Video Cameras
„ MP3 Players
„ Portable Instruments
General Description
The G5723B consists of a synchronous step-down
DC/DC converter and a LDO regulator. The DC/DC
converter is operated on current mode architecture.
Switching frequency is set at 1.4MHz allowing the use
of small surface mount inductor and capacitor. The
internal synchronous switches increase efficiency and
eliminate the need for external Schottky diode.
Ordering Information
ORDER
NUMBER
G5723B-33F11U
G5723B-33F61U
Note:F1: SOP-8 (FD)
1: Bonding Code
U: Tape & Reel
MARKING
G5723B-33
G5723B-33
F6: MSOP-10 (FD)
Pin Configuration
VOLTAGE
3.3V
3.3V
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Green)
SOP-8 (FD)
MSOP-10 (FD)
Typical Application Circuit
G5723B
G5723B
EN1 1
AGND 2
FB1 3
AGND 4
9. PGND
Thermal
Pad
8 LX
EN1 1
7 IN1 ^{AGND 2}
FB1 3
6 OUT2
AGND 4
5 IN2
NC 5
Thermal
Pad
10 LX
9 PGND
8 IN1
7 OUT2
6 IN2
SOP-8 (FD)
MSOP-10 (FD)
Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.
V_IN
5V
C_IN1
2.2µF
C_IN2
1µF
R1
V_OUT1 = 0.6V × (1+ _R2 )
G5723B
IN1
LX
EN1
FB1
IN2
2.2µH
C_FB* (option)
R1
R2 _18K
18K
OUT2
AGND PGND
V_OUT2
COUT2
4.7µF
V_OUT1
1.2V
1A
C_OUT1
10µF
Ver: 0.1
Aug 23, 2012
TEL: [phone]
http://www.gmt.com.tw
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