G5309 致新代理商 GMT DC-DC系列负载点（同步准PWM降压转换器）

General Description
G5309 is a 10A, synchronous DC/DC buck converter with integrated 20mΩ N-channel high-side MOSFETand 8.5mΩ 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 G5309 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 20mA for internal circuits. The G5309 is intended for the main power supply of LCD TV, Notebook Computer, or other low-voltage supplies as low as 0.75V. The G5309 is available in QFN4X4-28 and QFN5X5-32 package.

Features
Ultra-High Efficiency
Integrated 8.5mΩat Vcc=5V N-Channel MOSFET for Low Side
Integrated 20mΩat 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
Adjustable Output Range from 0.75V
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, 20mA Linear Regulator

Applications
LCD Monitor/LCD TV
Notebook Computers
I/O Supply
Chipset/RAM Supply as Low as 0.75V
Networking Power Supply

Ordering Information