Advanced
Monolithic
Systems
FEATURES
•
Trimmed 0.5% Tolerance
•
Wide Operating Current Range 0.1µA 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. 10µA
AMS421
0.5V SHUNT REGULATOR
RoHS compliant
APPLICATIONS
•
Battery Powered Systems
•
Switching Power Supplies
•
Isolated Power Supplies
•
Telecommunications
•
Error Amplifiers
•
Notebook/Personal Computer
•
Monitors/ VCR/ TV
•
Opto-isolator driver
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:
PIN CONNECTIONS
TOL.
±0.5%
±1.0%
±2.0%
Package
5 LEAD SOT-23
AMS421AM1
AMS421BM1
AMS421CM1
OPERATING
TEMP. RANGE
-40 to + 125°C
-40 to + 125°C
-40 to + 125°C
5L SOT-23
(M1)
VCC 1
GND 2
5 COLL
BLOCK DIAGRAM
V
CC
1
5
Ref
4
Co
N/C 3
4 REF
Top View
+
-
0.5V
2
GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
ADMOS [ ADVANCED MONOLITHIC SYSTEMS ]
