MP20045

Low Noise, 1A

Linear Regulator

MP20045 Rev. 1.0

www.MonolithicPower.com

1

10/13/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP20045 is a low-dropout linear regulator

supplies up to 1A current with 140mV dropout

voltage. The output voltage is set externally

which ranges from 1.5V to 5V by operating from

+2.5V to +5.5V input or can be preset internally

from 1.5V to 5V.

An internal PMOS pass element is used to

allow a low 110µA ground current, making the

MP20045 suitable for battery-power devices.

Other features include low-power shutdown,

short-circuit

and

thermal

protection.

The

MP20045 is available in 8-pin QFN (3mm x

3mm) and SOIC8E packages.

FEATURES

• Up to 1A Output Current

• Low 140mV Dropout at 1A

• Low 110µA Ground Current

• Fixed Output Versions Ranging from 1.5V to

5V and Adjustable Versions

• Open Drain Power-Good Status Output

• 56dB PSRR at 1kHz

• Current Limiting and Thermal Protection

• 3mm×3mm QFN8 and SOIC8E Packages

APPLICATIONS

• Notebook Computers

• Cordless Telephones

• Cellular Phones

• Modems

• Hand-Held Instruments

• PDA and Palmtop Computers

“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP20045

2.2

VOUT

VIN

EN

FB

R3

100k

PG

MP20045

R1

R2

2.2

C3(Optional)

0.1nF

VOUT

VIN

EN

FB

R3

100k

PG

1

OUT

2

V

=

(1+

)Volts

R

1.5

R

×

Fixed Version

Adjustable Version