L431L Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – 1.24V Low-Voltage Adjustable Precision Shunt Regulator

NIKO-SEM
1.24V Low-Voltage Adjustable
Precision Shunt Regulator
L431L
GENERAL DESCRIPTION
The L431L is a three-terminal adjustable shunt
regulator utilizing an accurate 1.24V band gap
reference. The output voltage can be set to any
value between 1.24V (V_REF) to 18V with two
external resistors as shown in the typical
application circuit. The device exhibit a wide
operating current range of 0.2 to 100 mA with a
typical dynamic impedance of 0.25Ω. Active
output circuitry provides a very sharp turn-on
characteristic, making the L431L excellent re-
placements for low-voltage zener diodes in
many applications, including on-board regulat-
ion and adjustable power supplies.
When used with an opto-coupler, the L431L is
ideal voltage reference in isolated feedback
circuits for 3.3V switching-mode power supplies.
The L431L shunt regulator is available in two
voltage tolerances (0.5% & 1.0%) and three
package options (TO-92, SOT-23-3 and SO-8).
FEATURES
z Internal amplifier with 100 mA capability
z Programmable output voltage to 18V
z 0.25Ω typical output impedance
z Pin to pin compatible with TLV431A,
TS431, SC431L & AS432
z Trimmed bandgap design 0.5% & 1.0%
with three package options
z Low output noise
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)
Reference
(R)
+
-
1.24 Vref
Cathod
(K)
Anode (A)
SYMBOL
Anode (A)
FUNCTIONAL BLOCK DIAGRAM
1
APR-25-2002