Datasheet > G5312

G5312

更新时间： 2024-09-25 01:25:03

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描述
High Efficiency 8A Synchronous Buck Converter

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G5312 数据手册

G5312

Global Mixed-mode Technology

High Efficiency 8A Synchronous Buck Converter

Features

General Description

Ultra-High Efficiency

G5312 is a 8A, synchronous DC/DC buck converter

with integrated 20mΩ N-channel high-side MOSFET

and 20mΩ 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

G5312 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 G5312 is intended for the main power

supply of LCD TV, Notebook Computer, or other

low-voltage supplies as low as 0.75V. The G5312 is

available in QFN4X4-28 package.

Integrated 20mΩ 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 I_LIMIT)

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

ORDER

NUMBER

G5312QN1U

G5312QN2U

TEMP.

RANGE

PACKAGE

(Green)

MARKING

5312

-40°C to +85°C

QFN4X4-28

Note:QN: QFN4X4-28

1 & 2: Leadframe Code

U : Tape & Reel

Pin Configuration

ILIM

V+

ILIM

V+

AGND

V5V

PGND

V+

AGND

V+

AGND

V5V

PGND

V+

17 V+

G5312QN2U QFN4X4-28

G5312QN1U 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: 1.1

Oct 21, 2013

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