RT9703

1

DS9703-08 March 2007

www.richtek.com

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-MOSFET power switch, designed for power rail on/off

≈ 80mΩ 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

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-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

RoHS Compliant and 100% Lead (Pb)-Free

(TOP VIEW)

SOP-8

FLG

VOUT

VOUT

GND

EN

VIN

VIN

IP

2

3

4

5

8

7

6

Note :

RichTek Pb-free and Green products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

100%matte tin (Sn) plating.

RT9703

Package Type

S : SOP-8

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)