G5698 Global Mixed-mode Technology Inc. 1.2MHz, 1.2A Synchronous Step-Down Regulator General Description Features The G5698 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 G5698 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 1.2MHz, 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 95% Low Quiescent Current: Only 50µA During Operation Internal Soft Start Function 1.2A 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 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) G5698ADJRE1U 5698A Adjustable -40°C~ +85°C TDFN3X3-10 For other output voltage, please contact us at [email protected] Note: RE: TDFN3X3-10 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5698 G5698 EN 1 NC 2 VIN 3 GND 4 VFB 5 10 Thermal Pad PGND 9 NC 8 NC 7 LX 6 NC 2.2µH V IN 5V LX VIN C FB * (option ) C IN 2.2µF CER EN Note: Recomm end connectin g the Therma l Pad to the GND or let it ke ep floa ti ng. V OUT = 0 .6 V • (1+ R1 R2 C OUT 10µF CER VFB GND TDFN3X3-10 V OUT 3.3V 1.2A R1 R2 80k 18k ) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.3 Aug 30, 2010 1