G5380B datasheet, PDF - EEWORLD Datasheet

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G5380B: DescriptionHigh Efficiency 8A Synchronous Buck Converter for 3.3V System Power; File Size67KB，2 Pages; ManufacturerGlobal Mixed-mode Technology; Websitehttp://www.gmt.com.tw

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G5380B Overview

High Efficiency 8A Synchronous Buck Converter for 3.3V System Power

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Global Mixed-mode Technology

G5380B

General Description

G5380B is a 8A, synchronous DC/DC buck converter

with integrated 20mΩ 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

G5380B 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 3.3V LDO supports 80mA for in-

ternal circuit with automatic bootstrapping to DC/DC

converter output. The G5380B is intended for the 5V

system power supply of Notebook Computer. The

G5380B is available in QFN4X4-28 package.

High Efficiency 8A Synchronous Buck Converter for

3.3V System Power

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 I

LIMIT

)

Quasi-PWM with 100ns Load-Step Response

1% VOUT Accuracy Over Line and Load

Programmable Switching Frequency

3.0V to 3.6V Adjustable Output Range

5.5V 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 3.3V, 80mA Bootstrapped Linear Regulator

Applications

Notebook Computers

I/O Supply

Networking Power Supply

Ordering Information

ORDER

NUMBER

G5380BQN1U

Note:QN: QFN4X4-28

1: Bonding Code

U : Tape & Reel

MARKING

5380B

TEMP.

RANGE

-40°C to +85°C

PACKAGE

(Green)

QFN4X4-28

PGOOD

LDO3

Pin Configuration

ENL

OUT

ON3

TON

BST

AGND

V+

VCC

VCLK

PGND

V+

PGND

G5380B QFN4X4-28

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

PGND

Ver: 0.3

Oct 21, 2013

TEL: 886-3-5788833

http://www.gmt.com.tw

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