Diodes AS431I User Manual
As431i, Description, Features
AS431I
Document number: DS36816 Rev.
2 - 2
1 of 16
January 2014
© Diodes Incorporated
AS431I
A Product Line of
Diodes Incorporated
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
Description
The AS431I 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 AS431I can be set to any value between V
REF
(2.5V) and the corresponding maximum cathode voltage (36V).
The AS431I is offered in two grade initial voltage tolerance at +25
o
C,
0.5%, and 1%.
This IC is available in 3 packages: TO-92 (bulk or ammo packing),
SOT-23 and SOT-89.
Features
Programmable Precise Output Voltage from 2.5V to 36V
High Stability Under Capacitive Load
Low Minimum Cathode Current for Regulation: 10µA (Typ.), 50µA
(Max.)
Low Temperature Deviation: 4.5mV Typical
Sink Current Capacity from 50µA to 100mA
Low Output Noise
Wide Operating Range: -40 to +125
o
C
Applications
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
Pin Assignments
(Top View) (Top View) (Top View)
(SOT-23/ N Package) (SOT-89 (Option 1/ R Package) (SOT-89 (Option 2/ R Package)
1
2
3
REF ANODE CATHODE
CATHODE
ANODE
REF
3
2
1
1
2
3
REF ANODE CATHODE