RT9742 Datasheet, PDF (1/19 Pages) Richtek Technology Corporation – The RT9742 is a cost-effective

®
RT9742
70mΩ/55mΩ, 3A/2A/1.5A/1A High-Side Power Switches
with Flag
General Description
The RT9742 is a cost-effective, low-voltage, single
N-MOSFET high-side Power Switch IC for USB application.
Low switch-on resistance and low supply current are
realized in this IC.
The RT9742 integrates an over-current protection circuit,
a short fold back circuit, a thermal shutdown circuit and
an under-voltage lockout circuit for overall protection.
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
miss-operation from happening due to inrush-current. The
RT9742 is an ideal solution for USB power supply and
can support flexible applications since it is available in
TSOT-23-5, TSOT-23-5 (FC) and SOT-23-3 package.
Features
 70mΩ/55mΩ (typ.) N-MOSFET Switch
 Operating Range : 2.7V to 6V
 Reverse Blocking Current
 Under Voltage Lockout
 Deglitched Fault Report (FLG)
 Thermal Protection with Fold-back
 Over Current Protection
 Short Circuit Protection
Applications
 USB Peripherals
 Notebook PCs
Pin Configurations
VIN EN/EN
5
4
2
3
VOUT GND FLG
TSOT-23-5 / TSOT-23-5 (FC)
(TOP VIEW)
VOUT
EN
5
4
2
3
VOUT GND VIN
TSOT-23-5
(For RT9742M Only)
GND
3
2
VIN
VOUT
SOT-23-3
Simplified Application Circuit
Supply Voltage
2.7V to 6V
Chip Enable
VIN
FLG
C_IN
RT9742
EN/EN ^VOUT
GND
USB Controller
Over-Current
C_OUT
V_BUS
D+
D-
GND
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS9742-00 July 2015
Data
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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