G5699 Global Mixed-mode Technology Inc. Dual 1.4MHz, 1A Synchronous Step-Down Regulator General Description Features The G5699 is a dual channel 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 for each channel. The 2.7V to 5.5V input voltage range makes the G5699 ideally suited for single Li-Ion battery-powered applications. Both regulators have independent input and enable pins. 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. The G5699 is available in TDFN3X3-12 package. High Efficiency: Up to 95% Internal Soft Start Function Output Current Channel 1: 1A Channel 2: 1A 2.7V to 5.5V 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 G5699RQ1U 5699 Note: RQ: TDFN3X3-12 1: Bonding Code U: Tape & Reel Pin Configuration TEMP. RANGE PACKAGE (Green) -40°C~ +85°C TDFN3X3-12 MARKING Typical Application Circuit G5699 VIN1 VIN2 1 LX2 2 GND 3 G5699 G5625 Thermal Pad 12 EN2 11 NC2 10 FB2 FB1 4 9 GND NC1 5 8 LX1 EN1 6 7 VIN1 CIN1 4.7µF CER VIN1 EN1 2.2µH VOUT1 LX1 FB1 CFB1* (option) R1 COUT1 4.7µF CER R2 VIN2 CIN2 4.7µF CER TDFN3X3-12 2.2µH VIN2 LX2 EN2 FB2 CFB2* (option) VOUT2 R3 COUT2 4.7µF CER R4 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. VOUT1 = 0.6V • (1+ VOUT2 = 0.6V • (1+ R1 R2 R3 R4 ) ) * Refer to Table. 1 for Component Selection TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.5 Jul 23, 2009 1