AMS421A 查看數據表（PDF） - Advanced Monolithic Systems Inc

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AMS421A

0.5V SHUNT REGULATOR

Advanced Monolithic Systems Inc 

TYPICAL APPLICATIONS

1.5V ≤ VCC ≤ 15V

0.1µF

1

Ref

4

+

-

0.5V

2

1.5V to 15V

10K

5

VO

1.000V

0.47µF

100K

100K

500 pF

LOW NOISE PRECISSION 1.000V REFERENCE

AMS421

2.5V ≤ VCC ≤ 15V

0.1µ

1

4

+

-

0.5V

2

Q1

VO

R3

5

R1

0.47µF

Co

R2

GND

Low cost LDO using an External PNP

Set the VOUT according to the following equation:

VOUT = VREF⎜⎛1 + R1 ⎟⎞ + IREFR1

⎝ R2 ⎠

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.

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

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