Preliminary
RT9703
80mΩ, 3A Smart Universal Power Switch with Flag
General Description
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:
The RT9703 is a low voltage, high performance single
N-Channel MOSFET power switch, designed for power
≈
rail on/off control with low RDS(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.
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
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 30µAmaking this
device ideal for portable battery-operated equipment.
ꢀ 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
The RT9703 is available in SOP-8 package requiring
minimum board space and smallest components.
ꢀ ACPI Power Distribution
Ordering Information
ꢀ PCI Bus Power Switching
ꢀ Motherboard & Notebook PCs
ꢀ PC Card Hot Swap Application
RT9703
Package Type
S : SOP-8
Operating Temperature Range
C : Commercial Standard
Pin Configurations
(TOP VIEW)
FLG
VOUT
VOUT
GND
8
7
6
5
IP
2
3
4
VIN
VIN
CE
SOP-8
DS9703-00 September 2003
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