G5313 Global Mixed-mode Technology High Efficiency 6A Synchronous Buck Converter Features General Description G5313 is a 6A, synchronous DC/DC buck converter with integrated 20mΩ N-channel high-side MOSFET and 20mΩ N-channel low-side MOSFET. It uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The G5313 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. The G5313 is intended for the power supply of Notebook Computer, or other low-voltage supplies as low as 0.75V. The G5313 is available in QFN4X4-28 package. Ultra-High Efficiency Integrated 20mΩ at VDD=5V N-Channel MOSFET for Low Side Integrated 20mΩ at VDD=5V N-Channel MOSFET for High Side No Current-Sense Resistor (Lossless ILIMIT) Quasi-PWM with 100ns Load-Step Response 1% VOUT Accuracy Over Line and Load Programmable Switching Frequency 0.75V to 3.6V Adjustable Output Range 4.5V to 28V Adapter or Battery Input Range Integrated Boost Switch OVP & UVP Over Temperature Protection (non-latch) 3.3ms Soft-Start Power-Good Indicator Applications Notebook Computers I/O Supply Chipset/RAM Supply as Low as 0.75V Networking Power Supply Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5313QN1U 5313 -40°C to +85°C QFN4X4-28 Note: QN: QFN4X4-28 1: Bonding Code U : Tape & Reel TON EN BST NC 24 23 22 21 VCC OUT 25 FB 27 26 PGOOD 28 Pin Configuration ILIM 1 20 V+ AGND 2 19 V+ 18 V+ 17 V+ LX 8 LX LX PGND 15 7 PGND 16 6 LX PGND 14 LX PGND 13 5 PGND 12 LX PGND 11 4 9 3 LX 10 VDD PGND V+ AGND G5313 QFN4X4-28 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.6 Apr 01, 2013 1