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AP431/AP431A
ADJUSTABLE PRECISION SHUNT REGULATOR
AP431/AP431A
Document number: DS31002 Rev. 15 - 2
1 of 16
www.diodes.com
June 2010
© Diodes Incorporated
Features
• Precision reference voltage
• AP431: 2.495V ± 1%
• AP431A: 2.495V ± 0.5%
• Sink current capability: 200mA
• Minimum cathode current for regulation: 300μA
• Equivalent full-range temp coefficient: 30 ppm/oC
• Fast turn-on response
• Low dynamic output impedance: 0.2Ω
• Programmable output voltage to 36V
• Low output noise
• Lead Free packages: SOT25, SC59, SC59R, SOT89-3L
and TO92-3L
• SOT23, SOT23R, SOT25, SC59, SC59R, SOP-8L,
SOT89-3L, TO92-3L: Available in “Green” Molding
Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Description
The AP431 and AP431A are 3-terminal adjustable precision
shunt regulators with guaranteed temperature stability over
the applicable extended commercial temperature range.
The output voltage may be set at any level greater than
2.495V (V
REF
) up to 36V merely by selecting two external
resistors that act as a voltage divider network. These
devices have a typical output impedance of 0.2Ω. Active
output circuitry provides very sharp turn-on characteristics,
making these devices excellent improved replacements for
Zener diodes in many applications.
The precise (+/-) 1% Reference voltage tolerance of the
AP431/AP431A make it possible in many applications to
avoid the use of a variable resistor, consequently saving
cost and eliminating drift and reliability problems associated
with it.
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
+
+
R2
R1
V
OUTVIN
VOUT = (1+R1/R2)VREF
Precision Regulator
C
in Cout
AP431
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