AN431AN-ATRE1 Diodes Incorporated

A Product Line of Diodes Incorporated AN431 ADJUSTABLE PRECISION SHUNT REGULATORS Description Pin Assignments The AN431 series ICs are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. These (Top View) ICs feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for ANODE Zener diodes in applications such as switching power supply, charger and other adjustable regulators. 3 The output voltage of these ICs can be set to any value between VREF (2.5V) and the maximum cathode voltage (36V). The AN431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. 1 2 These ICs are available in SOT-23 package. CATHODE REF Features SOT-23 Programmable Precise Output Voltage from 2.5V to 36V High Stability under Capacitive Load Applications Low Temperature Deviation: 4.5mV Typical Low Equivalent Full-range Temperature Coefficient with Charger o 20PPM/ C Typical Voltage Adapter Low Dynamic Output Resistance: 0.15 Typical Switching Power Supply Sink Current Capacity from 1mA to 100mA Graphic Card Low Output Noise Precision Voltage Reference o Wide Operating Range of -40 to +125 C Lead-Free Packages: SOT-23 Totally Lead-Free RoHS Compliant (Notes 1 & 2) Lead-Free Packages, Available in Green Molding Compound: SOT-23 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated AN431 Typical Applications Circuit (Cont.) V IN V OUT R1 R4 V =(1+R2/R3)*V R2 OUT REF V REF AN431 R3 High Current Shunt Regulator R2 V I IN OUT R1 I =V /R2+I OUT REF KA AN431 Current Source or Current Limit V AZ1117 V IN OUT R1 Adjust 5V, 1A 8.2K R2 250 AN431 R3 250 Precision 5V 1A Regulator 2 of 13 AN431 April 2015 Diodes Incorporated www.diodes.com Document number: DS37414 Rev. 3 - 2