AN431 Datasheet, PDF (1/13 Pages) BCD Semiconductor Manufacturing Limited – ADJUSTABLE PRECISION SHUNT REGULATORS

A Product Line of
Diodes Incorporated
AN431
ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The AN431 series ICs are three-terminal adjustable shunt regulators
with guaranteed thermal stability over a full operation range. These
ICs feature sharp turn-on characteristics, low temperature coefficient
and low output impedance, which make them ideal substitutes for
Zener diodes in applications such as switching power supply, charger
and other adjustable regulators.
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%.
These ICs are available in SOT-23 package.
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
20PPM/^oC Typical
 Low Dynamic Output Resistance: 0.15Ω Typical
 Sink Current Capacity from 1mA to 100mA
 Low Output Noise
 Wide Operating Range of -40 to +125^oC
 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)
Pin Assignments
(Top View)
ANODE
3
1
CATHODE
2
REF
SOT-23
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) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
R3
V_IN
R1
V_REF
R2
V_OUT
AN431 ^{VOUT=(1+R1/R2)*VREF}
AN431
Document number: DS37414 Rev. 3 - 2
Shunt Regulator
1 of 13
www.diodes.com
April 2015
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