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AP432/AP432A
ADJUSTABLE PRECISION SHUNT REGULATOR
AP432/AP432A
Document number: DS31003 Rev. 17 - 2
1 of 14
www.diodes.com
April 2011
© Diodes Incorporated
Descriptions
The AP432 and AP432A are 3-terminal adjustable precision
shunt regulators with guaranteed stable temperature over the
applicable extended commercial temperature range. The
output voltage may be set at any level greater than 1.24V
(V
REF
) up to 20V 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
AP432/AP432A 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.
Features
• Precision reference voltage
o AP432 : 1.24V ± 1%
o AP432A : 1.24V ± 0.5%
• Sink current capability: 200mA
• Minimum cathode current for regulation: 150μA
• Equivalent full-range temp coefficient: 30 ppm/°C
• Fast turn-on response
• Low dynamic output impedance: 0.2Ω
• Programmable output voltage to 20V
• Low output noise
• Lead Free packages: SOT25, SC59, SC59R,
SOT89-3L and TO92-3L
• SOT23, SOT23R, SOT25, SC59, SC59R, SOP-8L,
SOT89-3L and TO92-3L: Available in “Green” Molding
Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
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
AP432
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