G5310 Global Mixed-mode Technology High Efficiency 10A Synchronous Buck Converter Features General Description G5310 is a 10A, synchronous DC/DC buck converter with integrated 20mΩ N-channel high-side MOSFET and 8.5mΩ 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 G5310 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 G5310 is intended for the power supply of Notebook Computer, or other low-voltage supplies as low as 0.75V. The G5310 is available in QFN4X4-28 and QFN5X5-32 package. Ultra-High Efficiency Integrated 8.5mΩ 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) G5310QN2U 5310 -40°C to +85°C QFN4X4-28 G5310QA1U 5310 -40°C to +85°C QFN5X5-32 Note: QN: QFN4X4-28 QA: QFN5X5-32 1,2: Bonding Code U : Tape & Reel AGND 2 VDD 3 PGND 4 LX 5 LX 6 LX LX 25 NC 26 BST 28 TON 27 EN 30 VCC 21 29 OUT 24 V+ 20 V+ ILIM 19 V+ AGND 2 18 V+ VDD 3 22 V+ 17 V+ PGND 4 21 V+ V+ AGND 31 FB BST NC 22 32 PGOOD TON EN 23 25 24 VCC OUT 26 PGOOD FB 28 1 1 AGND 23 V+ V+ LX 5 20 PGND LX 6 19 PGND 7 LX 7 18 PGND 8 LX 8 17 PGND 15 16 PGND PGND PGND 13 14 PGND 9 LX 11 16 PGND 12 15 PGND PGND 14 PGND PGND 13 PGND 10 12 PGND LX 11 PGND 9 LX LX 10 LX LX ILIM 27 Pin Configuration G5310 QFN5X5-32 G5310 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: 0.5 Apr 01, 2013 1