AT431
Preliminary Product Information
1.24V low-Voltage Adjustable Precision
Shunt Regulator
Features
․Low-Voltage
Operation: Down to 1.24V
․1%
Reference-Voltage Tolerance
․Adjustable
Output Voltage, Vo=Vref to 12V
․Low
Operational Cathode Current….50μA
․0.25Ω
Typical Output Impedance
․SOT-23
and TO-92 Packages
Description
The AT431 is low-voltage three-terminal
adjustable voltage reference with specified
thermal stability over applicable commercial
temperature ranges. Output voltage may be set to
any value between Vref (1.24V) and 12V with
two external resistors (see Figure 2).
When used with an optocoupler, the AT431 is
ideal voltage reference in isolated feedback
circuits for 1.8V to 12 V switching-mode power
supplies. This device has typical output
impedance of 0.20Ω. Active output circuitry
provides a very sharp turn-on characteristic,
making the AT431 excellent replacements for
low-voltage zener diodes in many applications,
including onboard regulation and adjustable
power supplies.
Application
․Linear Regulators
․Voltage Reference for Power Circuit
Block Diagram and Symbol
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email:
service@aimtron.com.tw
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AIMTRON [ AIMTRON TECHNOLOGY ]
