RT9728

1

DS9728-05

October 2014

www.richtek.com

©

Copyright

2014 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Ordering Information

Features

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±±±±±10% Current Limit Accuracy @ 1.3A

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Adjustable Current Limit : 75mA to 1.3A (typ.)

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Meets USB Current Limiting Requirements

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Operating Voltage Range : 2.5V to 5.5V

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Reverse Input

−−−−− Output Voltage Protection

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Built-in Soft-Start

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120m

Ω

Ω

Ω

Ω

Ω High Side MOSFET

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120

μμμμμA Supply Current

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RoHS Compliant and Halogen Free

120m

Ω

Ω

Ω

Ω

Ω, 1.3A Power Switch with Programmable Current Limit

General Description

The RT9728 is a cost effective, low voltage, single

P-MOSFET high side power switch IC for USB application

with a programmable current limit feature. Low switch-on

resistance (typ.120m

Ω) and low supply current (typ.

120

μA) are realized in this IC.The RT9728 can offer a

programmable current limit threshold between 75mA and

1.3A (typ.) via an external resistor. The

±10% current limit

accuracy can be realized for all current limit settings.

Besides, a flag output is available to indicate fault

conditions to the local USB controller. Furthermore, the

chip also integrates an embedded delay function to prevent

mis-operation from happening due to high inrush current.

The RT9728 is an ideal solution for USB power supply

and can support flexible applications since it is functional

for various current limit requirements. It is available in

WDFN-6L 2x2 package.

Pin Configurations

(TOP VIEW)

WDFN-6L 2x2

VOUT

ILIM

GND

5

4

1

2

3

6

7

EN

VIN

FAULT

Applications

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USB Bus/Self Powered Hubs

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USB Peripheral Ports

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ACPI Power Distribution

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Battery Power Equipment

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3G/3.5G Data Card, Set-Top Boxes

Marking Information

J0 : Product Code

W : Date code

J0 : Product Code

W : Date Code

RT9728ZQW

RT9728GQW

J0W

J0W

Note :

***Empty means Pin1 orientation is Quadrant 1

Richtek products are :

ments of IPC/JEDEC J-STD-020.

RT9728

Package Type

QW : WDFN-6L 2x2 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Pin 1 Orientation

***

(2) : Quadrant 2, Follow EIA-481-D

(For RT9728GQW Only)