Ver: 0.7

Apr 01, 2013

TEL: 886-3-5788833

http://www.gmt.com.tw

1

G5309

Global Mixed-mode Technology

High Efficiency 10A Synchronous Buck Converter

Features

Ultra-High Efficiency

Integrated 8.5m

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

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

General Description

G5309 is a 10A, synchronous DC/DC buck converter

with integrated 20m

Ω N-channel high-side MOSFET

and 8.5m

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

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.

Ordering Information

ORDER

NUMBER

MARKING

TEMP.

RANGE

PACKAGE

(Green)

G5309QN1U

5309

-40°C to +85°C

QFN4X4-28

G5309QA1U

5309

-40°C to +85°C

QFN5X5-32

Note: QN: QFN4X4-28

QA: QFN5X5-32

1: Bonding Code

U : Tape & Reel

Pin Configuration

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

G5309 QFN5X5-32

1

ILIM

AGND

V5V

PGND

LX

LX

LX

LX

PGND

PGND

PGND

PGND

V+

V+

V+

V+

G5309 QFN4X4-28

2

3

4

5

6

7

8

17

18

19

20

21

22

23

24

AGND

V+

LX

8

7

6

5

4

3

2

1

17

18

19

20

ILIM

AGND

V5V

PGND

LX

LX

LX

LX

V+

V+

V+

V+

AGND

V+

LX

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

G5309 QFN5X5-32

1

ILIM

AGND

V5V

PGND

LX

LX

LX

LX

PGND

PGND

PGND

PGND

V+

V+

V+

V+

G5309 QFN4X4-28

2

3

4

5

6

7

8

17

18

19

20

21

22

23

24

AGND

V+

LX

8

7

6

5

4

3

2

1

17

18

19

20

ILIM

AGND

V5V

PGND

LX

LX

LX

LX

V+

V+

V+

V+

AGND

V+

LX