
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
Trimmed 0.5% Tolerance
Wide Operating Current Range 0.1
μ
A to 10mA
Low Reference Input Current 1.5nA
Low Dynamic Output Impedance
Low Output Noise
Nominal Temperature Range to 125
°
C
Temperature-Compensated: 50ppm/
°
C
Low supply current: typ. 10
μ
A
GENERAL DESCRIPTION
The AMS421 is a four-terminal adjustable open collector shunt regulator with guaranteed temperature stability over the entire
range of operation. The output voltage can be set to any value between 0.5V (V
REF
) and 15V by adding two external resistors.
The AMS421 features 0.5% 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:
APPLICATIONS
Battery Powered Systems
Switching Power Supplies
Isolated Power Supplies
Telecommunications
Error Amplifiers
Notebook/Personal Computer
Monitors/ VCR/ TV
Opto-isolator driver
PIN CONNECTIONS
5L SOT-23
(M1)
TOL.
Package
5 LEAD SOT-23
AMS421AM1
AMS421BM1
AMS421CM1
OPERATING
TEMP. RANGE
±
0.5%
±
1.0%
±
2.0%
BLOCK DIAGRAM
4
-40 to + 125°C
-40 to + 125°C
-40 to + 125°C
VCC
COLL
N/C
REF
GND
1
2
5
3
4
Top View
V
CC
1
GND
2
Ref
5
+
-
0.5V
Co