AT431
Low-Voltage Adjustable Precision
Shunt Regulator
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
1
Features
˙
Low-Voltage Operation: Down to 1.24V
˙
1% Reference-Voltage Tolerance
˙
Adjustable Output Voltage, Vo=Vref to 12V
˙
Low Operational Cathode Current….50μA
˙
0.25
Ω Typical Output Impedance
˙
SOT-23-3 , SOT-23-5 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 0.20
Ω. 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
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