RT9728A
®
DS9728A-06 November 2013 www.richtek.com
1
©
Copyright 2013 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
±±
±±
±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
120m
ΩΩ
ΩΩ
Ω High Side MOSFET
120
μμ
μμ
μA Supply Current
RoHS Compliant and Halogen Free
120m
ΩΩ
ΩΩ
Ω, 1.3A Power Switch with Programmable Current Limit
General Description
The RT9728A 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 RT9728A 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 RT9728A 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
USB Bus/Self Powered Hubs
USB Peripheral Ports
ACPI Power Distribution
Battery Power Equipment
3G/3.5G Data Card, Set-Top Boxes
VOUT
ILIM
VIN
GND
4
23
56
FAULT
EN/EN
VOUT
ILIM
VIN
GND
5
4
1
2
3
6
GND
7
EN/ENFAULT
WDFN-6L 2x2
RT9728A
Package Type
E : SOT-23-6
QW : WDFN-6L 2x2
H : Chip Enable High
L : Chip Enable Low
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
