G5719B Global Mixed-mode Technology 1MHz, 3A Synchronous Step-Down Regulator Features General Description The G5719B 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 G5719B 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 1MHz, 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. Output latch-off operation protects the step-down regulator from damage under short circuit and overvoltage conditions. High Efficiency: Up to 95% Low Quiescent Current: Only 50µA During Operation Internal Soft Start Function Output Current G5719BTB1U: 2A Continuous, 3A Peak G5719BRC1U: 3A Continuous 2.5V to 6V Input Voltage Range 1MHz 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 Power Good Output Short Circuit Latch-off Protection Output Overvoltage Latch-off Protection 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 OUTPUT VOLTAGE MARKING TEMP. RANGE PACKAGE (Green) G5719BT11U 519Bx Adjustable -40°C to +85°C SOT-23-5 G5719BTB1U 519Bx Adjustable -40°C to +85°C SOT-23-6 G5719BRC1U 519B Adjustable -40°C to +85°C TDFN2X2-8 Note: T1: SOT-23-5 TB: SOT-23-6 1: Bonding Code U: Tape & Reel RC: TDFN2X2-8 Pin Configuration Typical Application Circuit G5719B EN 1 5 VFB R 10k G5719B GND LX G5719B 2 3 4 VIN SOT-23-5 G5719B EN 1 6 VFB GND 2 5 PG LX 3 4 VFB 8 1 PG 2 VIN 3 GND 4 VIN 4~6V Thermal Pad Pad VIN GND 7 EN 6 LX 5 NC VIN PG 2.2µH LX CFB * (option) CIN 2.2µF CER TDFN2X2-8 VOUT = 0.6V • (1+ EN R1 R2 ) GND VFB VOUT 3.3V 2A COUT 10µF CER R1 R2 82k 18k VIN SOT-23-6 TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.5 Sep 25, 2013 1