RT9703 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – 80mΩ, 3A Smart Universal Power Switch with Flag

Preliminary
RT9703
80mΩ, 3A Smart Universal Power Switch with Flag
General Description
The RT9703 is a low voltage, high performance single
N-Channel MOSFET power switch, designed for power
rail on/off control with low R_DS(ON) ≈_dd80mΩ and full
protection functions. The RT9703 equipped with a charge
pump circuitry to drive the internal MOSFET switch and a
flag output is available to indicate fault conditions against
large di/dt which may cause the supply to fall out of
regulation. In order to fit different application, an IP pin is
offered for current limit point setting, a resistor from IP to
ground sets the current limit for the switch.
Additional features include soft-start to limit inrush current
during plug-in, thermal shutdown to prevent catastrophic
switch failure from high-current loads, under-voltage
lockout (UVLO) to ensure that the device remains off
unless there is a valid input voltage present, a precision
resistor-programmable output current limit up to 3.5A.
Besides, the lower quiescent current as 30µA making this
device ideal for portable battery-operated equipment.
The RT9703 is available in SOP-8 package requiring
minimum board space and smallest components.
Ordering Information
RT9703
Package Type
S : SOP-8
Operating Temperature Range
C : Commercial Standard
Features
Adjustable Current Limiting Up To 3.5A
Built-In (Typically 80mΩ) N-Channel MOSFET
Reverse Current Flow Blocking (no body diode) i.e.
Output Can Be Forced Higher Than Input (Off-State)
Low Supply Current:
30µA Typical at Switch On State
Less Than 1µA Typical at Switch Off State
Guaranteed 3A Continuous Load Current
Wide Input Voltage Ranges: 2V to 5.5V
Open-Drain Fault Flag Output
Hot Plug-In Application (Soft-Start)
1.7V Typical Under-Voltage Lockout (UVLO)
Thermal Shutdown Protection
Smallest SOP-8 Package Minimizes Board Space
Applications
LCD Monitor, LCD-TV
USB Power Module for ADSL
Information Appliance and Set-Top Box
Battery-Powered Equipment
Hot-Plug Power Supplies
ACPI Power Distribution
PCI Bus Power Switching
Motherboard & Notebook PCs
PC Card Hot Swap Application
Pin Configurations
(TOP VIEW)
FLG
VOUT
2
VOUT
3
GND
4
8
IP
7
VIN
6
VIN
5
CE
SOP-8
DS9703-00 September 2003
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