RT9728C

®

DS9728C-00 October 2015

www.richtek.com

1

©

Copyright 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Ordering Information

Note :

Richtek products are :



RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.



Suitable for use in SnPb or Pb-free soldering processes.

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 RT9728C 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 RT9728C 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. In

addition, 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 RT9728C 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

SOT-23-6 and WDFN-6L 2x2 packages.

Pin Configurations

(TOP VIEW)

SOT-23-6

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/3.5GData Card, Set-Top Boxes

WDFN-6L 2x2

RT9728C

Package Type

E : SOT-23-6

QW : WDFN-6L 2x2

H : Chip Enable High

Lead Plating System

G : Green (Halogen Free and Pb Free)

VOUT

ILIM

VIN

GND

5

4

1

2

3

6

7

EN

FAULT

VOUT ILIM

VIN GND

4

23

5

6

FAULT

EN