AS431 ADJUSTABLE PRECISION SHUNT REGULATORS Description Pin Assignments The AS431 is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full operation range. It features (Top View) (Top View) sharp turn-on characteristics, low temperature coefficient and low ANODE output impedance, which make it ideal substitute for Zener diode in 3 applications such as switching power supply, charger and other NC 1 5 ANODE adjustable regulators. 2 * (Note 4) The output voltage of AS431 can be set to any value between VREF CATHODE 4 3 REF 1 2 (2.5V) and the corresponding maximum cathode voltage (36V). REF CATHODE The AS431 precision reference is offered in two voltage tolerance: SOT23 SOT25 0.5% and 1.0%. Note 4: * Pin 2 is attached to substrate and must be connected to ANODE or This IC is available in 4 packages: TO92 (Ammo Packing), SOT23, open. SOT25 and SOT89. (Top View) (Top View) Features Programmable Precise Output Voltage from 2.5V to 36V High Stability under Capacitive Load Low Temperature Deviation: 4.5mV Typical Low Equivalent Full-range Temperature Coefficient with 1 2 3 1 2 3 20PPM/C Typical REF ANODE CATHODE REF ANODE CATHODE Sink Current Capacity from 1mA to 100mA SOT89 (Option 1) SOT89 (Option 2) Low Output Noise Wide Operating Range of -40 to +125C (Top View) Lead-Free Packages: SOT23, SOT25, TO92 (Ammo Packing), SOT89 3 CATHODE Totally Lead-Free RoHS Compliant (Notes 1 & 2) Lead-Free Packages, Available in Green Molding Compound: 2 ANODE SOT23, SOT25, TO92 (Ammo Packing), SOT89 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) 1 REF Halogen and Antimony Free. Green Device (Note 3) TO92 (Ammo Packing) Applications Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See AS431 Typical Applications Circuit Shunt Regulator High Current Shunt Regulator Current Source or Current Limit 2 of 20 AS431 May 2018 Diodes Incorporated www.diodes.com Document number: DS36599 Rev. 4 - 2