G5728B Global Mixed-mode Technology 1.4MHz 1A Synchronous Step-Down Regulator General Description Features The G5728B 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 G5728B ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. Switching frequency is internally set at 1.4MHz, 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. 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 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 Ordering Information ORDER NUMBER MARKING OUTPUT VOLTAGE (V) TEMP. RANGE PACKAGE (Green) G5728BT11U 578Bx Adjustable -40°C~ +85°C SOT-23-5 G5728BTO1U 578Bx Adjustable -40°C~ +85°C TSOT-23-5 G5728B-12TO1U 578Dx 1.2 -40°C~ +85°C TSOT-23-5 G5728BU51D 578B Adjustable -40°C~ +85°C WDFN2X2-6 Note: T1: SOT-23-5 TO:TSOT-23-5 U5:WDFN2X2-6 1: Bonding Code U&D: Tape & Reel Pin Configuration Typical Application Circuit G5728B G5728B EN 1 GND 2 LX 3 VIN 4~6V G5728B 5 4 VFB VIN LX VIN 3 2.2µH CFB (option) VFB 1 GND 2 VIN 7 GND 3 6 EN 5 LX 4 GND CIN 2.2µF CER 1 EN VFB GND 2 VOUT = 0.6V × (1+ SOT-23-5/TSOT-23-5 4 WDFN2X2-6 R1 R2 VOUT 3.3V 300mA COUT 10µF CER 5 R1 R2* 82k 18k ) * R2≦20kΩ for stability consideration. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.7 Jul 12, 2013 1 G5728C Global Mixed-mode Technology 1.4MHz 1A Synchronous Step-Down Regulator General Description Features The G5728C is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The 2.5V to 6V input voltage range makes the G5728C ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. Switching frequency is internally set at 1.4MHz, 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. High Efficiency: Up to 93% 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 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 Ordering Information ORDER NUMBER MARKING OUTPUT VOLTAGE TEMP. RANGE PACKAGE (Green) 578Cx Adjustable -40°C~ +85°C TSOT-23-5 G5728CTO1U Note: TO:TSOT-23-5 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5728C G5728C EN 1 GND 2 LX 4 VIN 4~6V 5 4 2.2µH CFB (option) 1 EN VFB GND VIN 2 TSOT-23-5 3 VFB CIN 2.2µF CER 3 LX VIN VOUT = 0.6V × (1+ R1 R2 VOUT 3.3V 300mA COUT 10µF CER 5 R1 R2* 82k 18k ) * R2≦20kΩ for stability consideration. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.1 Aug 17, 2012 1