Diodes AZ431A User Manual
Az431-a, Description, Applications
AZ431-A
Document number: DS36721 Rev.
4
– 2
1 of 21
January 2014
© Diodes Incorporated
AZ431-A
A Product Line of
Diodes Incorporated
ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The AZ431-A is a three-terminal adjustable shunt regulator with
guaranteed thermal stability over a full operation range. It features
sharp turn-on characteristics, low temperature coefficient and low
output impedance, which make it ideal substitute for Zener diode in
applications such as switching power supply, charger and other
adjustable regulators.
The output voltage of AZ431-A can be set to any value between V
REF
(2.5V) and the corresponding maximum cathode voltage (36V).
The AZ431-A precision reference is offered in two voltage tolerance:
0.4% and 0.8%.
This IC is available in 4 packages: TO92 (bulk or ammo packing),
SOT23, SOT25 and SOT89.
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
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/
o
C Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to +125
o
C
Lead-Free Packages: TO92, SOT23, SOT25, SOT89
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Lead-
Free Packages, Available in “Green” Molding Compound:
TO92, SOT23, SOT25, SOT89
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 r 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.
Pin Assignments
(Top View) (Top View) (Top View)
(SOT23/ N Package) (SOT89 Option 1/ R Package) (SOT89 Option 2/ R Package)
3
2
1
ANODE
REF
CATHODE
1
2
3
REF
ANODE
CATHODE
1
2
3
REF
ANODE
CATHODE