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RT9181

150mA LDO Regulator with POG

Richtek Technology 

Preliminary

RT9181

150mA LDO Regulator with POG

General Description

The RT9181 is a low dropout voltage regulator with

an output 2% accuracy and supply a continuous

150mA current within operating range from a +3V to

+5.5V input. The power good function monitors the

output voltage and indicates by pulling low the power

good output (open drain).

The RT9181 requires a small output capacitor with

low ESR for stabilizing output voltage. The device

also minimizes output overshoot during power up.

The RT9181 uses an internal PMOS as the pass

device, which consumes 160µA supply current

independent of load and dropout conditions. The CE

pin controls the output and consumes no input bias

current. Other features include current limiting, over

temperature protection, and under voltage lockout.

Applications

z Processor Power-Up Sequencing

z Laptop, Notebook, and Palmtop Computers

Ordering Information

RT9181… …

Package type

B : SOT-25

Operating temperature range

C: Commercial standard

Features

z Low Dropout Voltage Regulator, Output 1.2V

z Up to 150mA Output Current

z Power Good (POG) Function

z Chip Enable/Shutdown Function

z Load Independent, Low Ground Current, 160µA

z Current Limiting and Thermal Protection

z Under Voltage Lockout (UVLO)

z Low Variation Due to Load and Line Regulation

z Output Stable with Low ESR Capacitors

z SOT-25 Package

Pin Configurations

Part Number

Pin Configurations

RT9181CB

(Plastic SOT-25)

5

4

123

TOP VIEW

1. VIN

2. GND

3. CE

4. POG

5. VOUT

Typical Application Circuit

VIN

VIN POG

CIN

1µF

CE VOUT

ON

GND

OF F

10K

POG

VOUT

C OU T

1µF

DS9181-00 February 2002

www.richtek-ic.com.tw

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