G5723B Global Mixed-mode Technology 1.4MHz 1A Synchronous Buck Converter with 600mA LDO Regulator Features Applications Buck Converter High Efficiency: Up to 93% Low Quiescent Current: Only 50µA During Operation 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 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. LDO Regulator Dropout voltage typically 0.65V @ IO = 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 Ordering Information ORDER NUMBER MARKING VOLTAGE TEMP. RANGE PACKAGE (Green) G5723B-33F11U G5723B-33F61U G5723B-33 G5723B-33 3.3V 3.3V -40°C to +85°C -40°C to +85°C SOP-8 (FD) MSOP-10 (FD) Note:F1: SOP-8 (FD) 1: Bonding Code F6: MSOP-10 (FD) U: Tape & Reel Pin Configuration Typical Application Circuit G5723B G5723B EN1 G5723B 8 1 LX 9. PGND AGND 7 2 FB1 3 AGND 4 Thermal Pad SOP-8 (FD) VIN 5V IN1 6 OUT2 5 IN2 EN1 1 AGND 2 FB1 3 10 Thermal Pad CIN1 2.2µF LX 9 PGND 8 IN1 AGND 4 7 OUT2 NC 5 6 IN2 IN1 2.2µH LX CFB * (option) VOUT1 1.2V 1A COUT1 10µF EN1 FB1 R1 R2 18K 18K IN2 CIN2 1µF OUT2 AGND MSOP-10 (FD) PGND VOUT2 COUT2 4.7µF R1 VOUT1 = 0.6V × (1+ ) R2 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Aug 23, 2012 1