RT9728A
120m, 1.3A Power Switch with Programmable Current Limit
General Description Features
zz z zz 10% Current Limit Accuracy @ 1.3A
The RT9728A is a cost effective, low voltage, single
zz z zz Adjustable Current Limit : 75mA to 1.3A (typ.)
P-MOSFET high side power switch IC for USB application
zz z zz Meets USB Current Limiting Requirements
with a programmable current limit feature. Low switch-on
zz z zz Operating Voltage Range : 2.5V to 5.5V
resistance (typ.120m) and low supply current (typ.
zz z zz Reverse InputOutput Voltage Protection
120A) are realized in this IC.The RT9728A can offer a
zz z zz Built-in Soft-Start
programmable current limit threshold between 75mA and
zz z zz 120m High Side MOSFET
1.3A (typ.) via an external resistor. The 10% current limit
zz z zz 120A Supply Current
accuracy can be realized for all current limit settings. In
zz z zz RoHS Compliant and Halogen Free
addition, a flag output is available to indicate fault
conditions to the local USB controller. Furthermore, the
Applications
chip also integrates an embedded delay function to prevent
z USB Bus/Self Powered Hubs
mis-operation from happening due to high inrush current.
z USB Peripheral Ports
The RT9728A is an ideal solution for USB power supply
z ACPI Power Distribution
and can support flexible applications since it is functional
z Battery Power Equipment
for various current limit requirements. It is available in
z 3G/3.5G Data Card, Set-Top Boxes
SOT-23-6 and WDFN-6L 2x2 packages.
Pin Configurations
Ordering Information
RT9728A (TOP VIEW)
Package Type
VOUT ILIM FAULT
E : SOT-23-6
QW : WDFN-6L 2x2
6 5 4
Lead Plating System
23
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with EN/EN
VIN GND
Halogen Free and Pb free)
SOT-23-6
H : Chip Enable High
L : Chip Enable Low
Note :
1 6
VOUT VIN
Richtek products are : 2 5
ILIM GND
FAULT 3 7 4 EN/EN
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
WDFN-6L 2x2
` Suitable for use in SnPb or Pb-free soldering processes.
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
DS9728A-04 January 2013 www.richtek.com
1
GNDRT9728A
Marking Information
RT9728AHGE RT9728ALGE
01= : Product Code 02= : Product Code
01=DNN 02=DNN
DNN : Date Code DNN : Date Code
RT9728AHGQW RT9728ALGQW
17 : Product Code 19 : Product Code
W : Date Code W : Date Code
17W 19W
RT9728AHZQW RT9728ALZQW
17 : Product Code 19 : Product Code
W : Date Code W : Date Code
17W 19W
Typical Application Circuit
VIN VOUT
V V
OUT
IN
C
IN
RT9728A
150F
10F
R
FAULT
100k
R
ILIM
ILIM
FAULT Signal FAULT
Chip Enable EN/EN GND
Functional Pin Description
Pin No.
Pin Name Pin Function
SOT-23-6 WDFN-6L 2x2
1 6 VIN Input Voltage.
5, Ground. The exposed pad must be soldered to a large PCB and
2 GND
7 (Exposed Pad) connected to GND for maximum power dissipation.
3 4 Chip Enable.
EN/EN
Active-Low Open-Drain Output. Asserted during over current,
4 3 FAULT
over temperature, or reverse-voltage conditions.
Current Limit Set Pin. External resistor used to set current limit
5 2 ILIM
threshold. Recommend 19.1k R 232k.
ILIM
6 1
VOUT Power Switch Output.
Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
www.richtek.com DS9728A-04 January 2013
2