Ver: 1.2

May 17, 2005

TEL: 886-3-5788833

http://www.gmt.com.tw

5

G528/G528A

Global Mixed-mode Technology Inc.

Pin Description

PIN

G528

G528A

NAME

PIN FUNCTION

1

1

GND

Ground.

2,3

2,3

IN

Input Supply: Output MOSFET source, which also supplies IC's internal circuitry. Connect to

positive supply.

4

EN

Active-low switch enable input. A logic low turns on the switch.

4

EN

Active-High switch enable input. A logic High turns on the switch.

5

5

FLG

Open-Drain Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent, thermal

shutdown and UVLO.

6,7,8

6,7,8

OUT

Switch Output: Output MOSFET drain. Typically connect to switched side of load.

Typical Applications

Single-Port Self-Powered USB Hub Application

Function Block Diagrams

Upstream

V

100mA max.

VBUS

D+

D

－

GND

Data

GND

IN OUT

3.3 V USB Controller

VIN

ON/OFF

G528

OUT

GND

＋

USB

Port

Data

D+

GND

Ferrite

Beads

GND

150µF

G911

EN

0.1µF

VCC

V

BUS

100mA max.

D

D

－

GND

Data

GND

IN

OUT

VIN

ON/OFF

OUT

GND

＋

USB

Port

Data

V

BUS

D

-

Ferrite

Beads

1µF

GND

150µF

1µF

EN

0.1µF

OC

FLG

5.0V

10K

100K

IN

Upstream

V

100mA max.

VBUS

D+

D

－

GND

Data

GND

IN OUT

3.3 V USB Controller

VIN

ON/OFF

G528

OUT

GND

＋

USB

Port

Data

D+

GND

Ferrite

Beads

GND

150µF

G911

EN

0.1µF

VCC

V

BUS

100mA max.

D

D

－

GND

Data

GND

IN

OUT

VIN

ON/OFF

OUT

GND

＋

USB

Port

Data

V

BUS

D

-

Ferrite

Beads

1µF

GND

150µF

1µF

EN

0.1µF

OC

FLG

5.0V

10K

100K

IN

Upstream

V

100mA max.

VBUS

D+

D

－

GND

Data

GND

IN OUT

3.3 V USB Controller

VIN

ON/OFF

G528

OUT

GND

＋

USB

Port

Data

D+

GND

Ferrite

Beads

GND

150µF

G911

EN

0.1µF

VCC

V

BUS

100mA max.

D

D

－

GND

Data

GND

IN

OUT

VIN

ON/OFF

OUT

GND

＋

USB

Port

Data

V

BUS

D

-

Ferrite

Beads

1µF

GND

150µF

1µF

EN

0.1µF

OC

FLG

5.0V

10K

100K

IN

Clock

BandGap

Reference

UVLO

Thermal Sense

Overcurrent

Limiting

Gate Control

Current

Sense

CMP

IN

OUT

FLG

EN

GND

Clock

BandGap

Reference

UVLO

Thermal Sense

Overcurrent

Limiting

Gate Control

Current

Sense

CMP

IN

OUT

FLG

EN

GND