AT431

www.DataSheet4U.com 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: [email protected] 1 AT431 Preliminary Product Information 1.24V Low-Voltage Adjustable Precision Shunt Re...