Ver: 0.3

Oct 16, 2013

TEL: 886-3-5788833

http://www.gmt.com.tw

1

G5380

Global Mixed-mode Technology

High Efficiency 8A Synchronous Buck Converter for

5V System Power

Features

Ultra-High Efficiency

Low Quiescent Current of 40µA

Integrated 17m

Ω at VCC=5V N-Channel

MOSFET for Low Side

Integrated 20m

Ω at VCC=5V N-Channel

MOSFET for High Side

Quasi-PWM with 100ns Load-Step Response

1% VOUT Accuracy Over Line and Load

Programmable Switching Frequency

4.5V to 5.5V Adjustable Output Range

6V 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 5V, 80mA Bootstrapped Linear Regulator

Applications

Notebook Computers

I/O Supply

Networking Power Supply

General Description

G5380 is a 8A, synchronous DC/DC buck converter

with integrated 20m

Ω N-channel high-side MOSFET

and 17m

Ω 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

G5380 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 80mA for internal

circuit with automatic bootstrapping to DC/DC con-

verter output. The G5380 is intended for the 5V sys-

tem power supply of Notebook Computer. The G5380

is available in QFN4X4-28 package.

Ordering Information

ORDER

NUMBER

MARKING

TEMP.

RANGE

PACKAGE

(Green)

G5380QN1U

5380

-40°C to +85°C

QFN4X4-28

Note: QN: QFN4X4-28

1: Bonding Code

U : Tape & Reel

Pin Configuration

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

8

7

6

5

4

3

2

1

17

18

19

20

AGND

V+

V+

V+

V+

V+

VCC

VCLK

PGND

LX

LX

LX

V+

LX

G5380 QFN4X4-28

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

8

7

6

5

4

3

2

1

17

18

19

20

AGND

V+

V+

V+

V+

V+

VCC

VCLK

PGND

LX

LX

LX

V+

LX

G5380 QFN4X4-28