Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
The AS431 is a three-terminal adjustable shunt regula-
tor with guaranteed thermal stability over a full opera-
tion range. It features sharp turn-on characteristics, low
temperature coefficient and low output impedance,
which make it ideal substitute for Zener diode in appli-
cations such as switching power supply, charger and
other adjustable regulators.
The output voltage of AS431 can be set to any value
between V
REF
(2.5V) and the corresponding maximum
cathode voltage (36V).
The AS431 precision reference is offered in two volt-
age tolerance: 0.5% and 1.0%.
This IC is available in 4 packages: TO-92 (bulk or
ammo packing), SOT-23, SOT-23-5 and SOT-89.
AS431
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 Coeffi-
cient with 20PPM/
o
C Typical
Sink Current Capacity from 1mA to 100mA
Low Output Noise
Wide Operating Range of -40 to 125
o
C
Applications
·
·
·
·
·
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
SOT-89
TO-92(Bulk Packing)
TO-92(Ammo Packing)
SOT-23
SOT-23-5
Figure 1. Package Types of AS431
Dec. 2012 Rev. 2. 6
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
