1.24V Adjustable Shunt Regulator

B431L
























Pin Connection


Description

Th 431L is a three terminal adjustable shunt regulator with
thermal stability of 50ppm/°C. The output voltage can be
adjusted to any value from 1.24V (V
REF
) to 16V with two
external resistors. These devices have a typical output
impedance of 0.05Ω. Active output circuitry provides a very
sharp turn-on characteristics and making the device excellent
replacement for zener diodes in many applications. The B431L
is an ideal voltage reference in an isolated feedback circuit for
3.0V switch mode power supplies

The B431L shunt regulator is available with three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package options
(SOT-23-3, TO-92, 8SOIC). This allows the designer the
opportunity to select the optimum combination of cost and
performance for their application.
Features

• Low voltage operation (down to 1.24V)
• Wide operating current……80µA to 100mA
• Trimmed bandgap design………….. ± 0.5%
• Low Dynamic Output Impedance…....0.05Ω
• Wide temperature range…... -40°C to +85°C
• Available in ….….SOT-23-3, TO-92 , 8SOIC
• Pin-to-Pin Replacement …………….SC431L
Applications

• Switching Power Supplies
• Adjustable Power Supplies
• Linear Regulators
• Battery Powered Equipment
• Monitors, TV, VCR
• Instrumentation
SOT-23-3 (K3)
Bay Linear
Inspire the Linear Power

Anode
TO-92 (Z)
132

Bay Linear, Inc 2418 Armstrong Street, Livermore, CA 94550 Te



Top View
BAY
CathodeRef
Bottom View
Ref
Anode
Cathode
Ordering Information








Package Tolerance
0.5% 1% 2%
TO-92 B431LAZ B431LBZ B431LCZ
SO-8 B431LAM B431LBM B431LCM
SOT-23 B431LAK3 B431LBK3 B431LCK3
e B
l: (925) 606-5950, Fax: (925) 940-9556 www.baylinear.com