AT431 Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – Low-Voltage Adjustable Precision Shunt Regulator

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
Application
․Linear Regulators
․Voltage Reference for Power Circuit
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.
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: [phone] Fax: [phone]
WWW: http://www.aimtron.com.tw
2/8/2006 REV:1.1
Email: [e-mail]
1