Advanced Monolithic Systems, Inc.

www.advanced-monolithic.com

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

Advanced

AMS421

Monolithic

0.5V SHUNT REGULATOR

Systems

RoHS compliant

FEATURES

APPLICATIONS

• Trimmed 0.25% Tolerance

• Battery Powered Systems

• Wide Operating Current Range 0.1µA to 10mA

• Switching Power Supplies

• Low Reference Input Current 1.5nA

• Isolated Power Supplies

• Low Dynamic Output Impedance

• Telecommunications

• Low Output Noise

• Error Amplifiers

• Nominal Temperature Range to 125°C

• Notebook/Personal Computer

• Temperature-Compensated: 50ppm/°C

• Monitors/ VCR/ TV

• Low supply current: typ. 10µA

• Optoisolator driver

GENERAL DESCRIPTION

The AMS421 is a four-terminal adjustable open collector shunt regulator with guaranteed temperature stability over the entire

The AMS421 features 0.25% initial tolerance, low dynamic output impedance and operates over a wide current range. Due to

the sharp turn-on characteristics this device is an excellent replacement for Zener diodes in many applications.

AMS421 is available 5 pin SOT-23 packages.

ORDERING INFORMATION:

PIN CONNECTIONS

TOL.

Package

5 LEAD SOT-23

OPERATING

TEMP. RANGE

±0.25%

AMS421AM1

-40 to + 125°C

±0.5%

AMS421BM1

-40 to + 125°C

±1.0%

AMS421CM1

-40 to + 125°C

BLOCK DIAGRAM

5L SOT-23

(M1)

VCC

COLL

N/C

REF

GND

1

2

5

3

4

Top View

1

GND

2

Ref

4

5

+

-

0.5V

Co