1

RT9703

Preliminary

DS9703-00 September 2003

Features

Pin Configurations

Applications

80m

Ω

Ω

Ω

Ω

Ω, 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

Ω 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 30

µA 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

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

Adjustable Current Limiting Up To 3.5A

Built-In (Typically 80m

Ω

Ω

Ω

Ω

Ω) N-Channel MOSFET

Reverse Current Flow Blocking (no body diode) i.e.

Output Can Be Forced Higher Than Input (Off-State)

Low Supply Current:

30

µµµµµA Typical at Switch On State

Less Than 1

µµµµµA 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

(TOP VIEW)

SOP-8

FLG

VOUT

VOUT

GND

CE

VIN

VIN

IP

2

3

4

5

8

7

6

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