RT9728 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – The RT9728 is a cost effective

RT9728
120mΩ, 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.120mΩ) and low supply current (typ.
120μA) 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.
Features
 ±10% Current Limit Accuracy @ 1.3A
 Adjustable Current Limit : 75mA to 1.3A (typ.)
 Meets USB Current Limiting Requirements
 Operating Voltage Range : 2.5V to 5.5V
 Reverse Input − Output Voltage Protection
 Built-in Soft-Start
 120mΩ High Side MOSFET
 120μA Supply Current
 RoHS Compliant and Halogen Free
Applications
 USB Bus/Self Powered Hubs
 USB Peripheral Ports
 ACPI Power Distribution
 Battery Power Equipment
 3G/3.5G Data Card, Set-Top Boxes
Ordering Information
RT9728
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
(For RT9728GQW Only)
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)
Note :
***Empty means Pin1 orientation is Quadrant 1
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.
Pin Configurations
(TOP VIEW)
VOUT 1
ILIM 2
FAULT 3
6 _VIN
5 GND
7 4 EN
WDFN-6L 2x2
Marking Information
RT9728GQW
J0W
J0 : Product Code
W : Date code
RT9728ZQW
J0W
J0 : Product Code
W : Date Code
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS9728-05 October 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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