L431 Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – 2.5V Low-Voltage Adjustable Precision Shunt Regulator

NIKO-SEM
2.5V Low-Voltage Adjustable
Precision Shunt Regulator
L431
GENERAL DESCRIPTION
The L431 is a three-terminal adjustable shunt
regulator utilizing an accurate 2.5V band-gap
reference. The output voltage can be set to any
value between 2.5V (V_REF) to 29V with two
external resistors as shown in the typical
application circuit. The device exhibit a wide
operating current range of 0.4 to 100 mA with a
typical dynamic impedance of 0.25Ω. The cha-
racteristics of these reference make it exce-
llent replacements for zener diodes in many
applications such as digital voltmeters, power
supplies, and op amp circuitry. The 2.5V volt
reference makes it convenient to obtain a
stable reference from 5.0V logic supplies.
The L431 shunt regulator is available in three
voltage tolerances (0.5%, 1.0% and 2%) and
three package options (TO-92, SOT-23-3,
SOT-23-5 and SOIC-8).
FEATURES
z Internal amplifier with 70 mA capability
z Programmable output voltage to 29V
z 0.25Ωtypical output impedance
z Pin to pin compatible with TL431, LM431
, SC431 & AS431
z Trimmed band-gap design 0.5%, 1.0%
and 2% with three package options
z Low cost solution
APPLICATIONS
z Linear regulator controller
z Precision voltage reference
z Switching power supplies
z Battery operating equipment
z Instrumentation
z PCs, Computer disk drives
SYMBOL & BLOCK DIAGRAM
Cathode (K)
Reference (R)
Anode (A)
SYMBOL
Reference
(R)
+
-
2.5 Vref
Cathod
(K)
Anode (A)
FUNCTIONAL BLOCK DIAGRAM
1
JAN-08-Y02