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Technical content

Features

„ Ultra-High Efficiency „ Low Quiescent Current of 40µA „ Integrated 17mΩ at VCC=5V N-Channel MOSFET for Low Side „ Integrated 20mΩ at VCC=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 „ 4.5V to 5.5V Adjustable Output Range „ 6V to 28V Adapter or Battery Input Range „ Noiseless Pulse-skipping Mode (25kHz min) „ VCLK Output „ Integrated Boost Switch „ OVP & UVP „ Over Temperature Protection (non-latch) „ 3.3ms Soft-Start „ Power-Good Indicator „ Fixed 5V, 80mA Bootstrapped Linear Regulator

Applications

„ Notebook Computers „ I/O Supply „ Networking Power Supply General Description G5380 is a 8A, synchronous DC/DC buck converter with integrated 20m Ω N-channel high-side MOSFET and 17mΩ N-channel low-side MOSFET. It uses con- stant on-time control scheme to handle wide in- put/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while main- taining a relatively constant switching frequency. The G5380 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in tradi- tional current-mode PWMs. Single-stage buck conver- sion allows these devices to directly step down high-voltage batteries for the highest possible effi- ciency. The built-in 5V LDO supports 80mA for internal circuit with automatic bootstrapping to DC/DC con- verter output. The G5380 is intended for the 5V sys- tem power supply of Notebook Computer. The G5380 is available in QFN4X4-28 package.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5380QN1U 5380 -40 °C to +85°C QFN4X4-28 Note: QN: QFN4X4-28 1: Bonding Code U : Tape & Reel Pin Configuration Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. 16 21 20AGND VCC VCLK PGND PGND PGND PGND PGND PGND PGND LX LX LX LX LX BST TON ON5 OUT FB PGOOD LDO5 ENL LX G5380 QFN4X4-28 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. 16 21 20AGND VCC VCLK PGND PGND PGND PGND PGND PGND PGND LX LX LX LX LX BST TON ON5 OUT FB PGOOD LDO5 ENL LX G5380 QFN4X4-28