AS431 Datasheet, PDF (1/17 Pages) Alpha Industries – Precision Adjustable Shunt Regulator

Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
Features
AS431
The AS431 series ICs are three-terminal adjustable
shunt regulators with guaranteed thermal stability over
a full operation range. These ICs feature sharp turn-on
characteristics, low temperature coefficient and low
output impedance, which make them ideal substitutes
for Zener diodes in applications such as switching
power supply, charger and other adjustable regulators.
The output voltage of these ICs can be set to any value
between V_REF (2.5V) and the maximum cathode volt-
age (36V).
The AS431 precision reference is offered in two band-
gap tolerance: 0.4% and 0.8%.
· Programmable Precise Output Voltage from 2.5V
to 36V
· Very Accurate Reference Voltage: 0.15% Typical
· High Stability under Capacitive Load
· Low Temperature Deviation: 4.5mV Typical
· Low Equivalent Full-range Temperature Coeffi-
cient with 20PPM/^oC Typical
· Low Dynamic Output Resistance: 0.15Ω Typical
· Sink Current Capacity from 1mA to 100 mA
· Low Output Noise
· Wide Operating Range of -40 to 125^oC
Applications
These ICs are available in 4 Packages: TO-92, SOT-23-
3, SOT-23-5 and SOT-89 .
·
Charger
· Voltage Adapter
· Switching Power Supply
· Graphic Card
· Precision Voltage Reference
SOT-89
TO-92
Nov. 2005 Rev. 1. 1
SOT-23-3
SOT-23-5
Figure 1. Package Types of AS431
BCD Semiconductor Manufacturing Limited
1