G5383A Global Mixed-mode Technology High Efficiency 4A Synchronous Buck Converter Features General Description G5383A is a 4A, synchronous DC/DC buck converter with integrated 30mΩ N-channel high-side MOSFET and 30mΩ 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 G5383A 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 built-in 5V LDO supports 10mA for internal circuits. The G5383A is intended for the power supply as low as 0.9V. The G5383A is available in QFN3X3-24 package. Ultra-High Efficiency Low Quiescent Current of 30µA Integrated 30mΩ at V5V=5V N-Channel MOSFET for Low Side Integrated 30mΩ at V5V=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 Adjustable Output Range from 0.9V 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 Fixed 5V, 10mA Linear Regulator Applications Networking Power Supply I/O Supply Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5383AQU1U 5383A -40°C to +85°C QFN3X3-24 Note: QU: QFN3X3-24 1: Bonding Code U : Tape & Reel FB TON BST V+ V+ 24 23 22 21 20 Pin Configuration 19 V+ 18 V+ 3 17 V+ PGOOD 4 16 LX EN 5 15 PGND PGND 6 14 PGND NC 7 13 PGND 10 11 12 PGND PGND LX LX V+ V+ 9 2 LX V5V 8 1 LX AGND G5383A QFN3X3-24 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Nov 27, 2013 1