Advanced Monolithic Systems, Inc.

www.advanced-monolithic.com

Phone (925) 443-0722 Fax (925) 443-0723

AMS421

TYPICAL APPLICATIONS

LOW NOISE PRECISSION 1.000V REFERENCE

Low cost LDO using an External PNP

Maximum output current is (PNP Hfe)10mA. The transistor current rating and package depends of the application dropout.

The power dissipation for the PNP transistor is Iout (Vin-Vout). The package type should be selected according to the Power

dissipation.

2

+

-

0.5V

0.1µ

1

Q1

5

4

0.47µF

Co

GND

R1

I

R2

R1

1

V

V

REF

REF

OUT

+

⎟

⎠

⎞

⎜

⎝

⎛

+

=

1.5V to 15V

0.1µF

1

10K

1.000V

100K

0.47µF

100K

500 pF

2

Ref

4

5

+

-

0.5V