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

致新G5309

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

Part Number	Vin (V)min.	Vin (V)max.	IOUT(A)	FSW (k Hz)	FB (V)	HSRON (mΩ)	LSRON(mΩ)	Note	Package
G5309	4.5	28	10	ADJ	0.75	20	8.5	With 5V Supply, EN, PGOOD	QFN4X4-28

High Efficiency 10A Synchronous Buck Converter

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