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G5383: DescriptionHigh Efficiency 8A Synchronous Buck Converter; File Size99KB，2 Pages; ManufacturerGlobal Mixed-mode Technology; Websitehttp://www.gmt.com.tw

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G5383 Overview

High Efficiency 8A Synchronous Buck Converter

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Global Mixed-mode Technology

G5383

General Description

G5383 is a 8A, synchronous DC/DC buck converter

with integrated 30mΩ N-channel high-side MOSFET

and 15mΩ 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

G5383 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 10mA for internal

circuits. The G5383 is intended for the power supply

as low as 0.9V. The G5383 is available in QFN3X3-24

package.

High Efficiency 8A Synchronous Buck Converter

Features

Ultra-High Efficiency

Low Quiescent Current of 30µA

Integrated 15mΩ 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 I

LIMIT

)

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

G5383QU1U

Note: QU: QFN3X3-24

1: Bonding Code

U : Tape & Reel

MARKING

5383

TEMP.

RANGE

-40°C to +85°C

PACKAGE

(Green)

QFN3X3-24

Pin Configuration

TON

BST

V+

AGND

V5V

V+

PGOOD

PGND

V+

PGND

V+

PGND

G5383 QFN3X3-24

Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation.

PGND

Ver: 0.4

Nov 27, 2013

TEL: 886-3-5788833

http://www.gmt.com.tw

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