LM431A Datasheet, PDF (1/12 Pages) Fairchild Semiconductor – Programmable Shunt Regulator

LM431A/LM431B/LM431C
Programmable Shunt Regulator
www.fairchildsemi.com
Features
• Programmable Output Voltage to 36 Volts
• Low Dynamic Output Impedance 0.20 Typical
• Sink Current Capability of 1.0 to 100mA
• Equivalent Full-Range Temperature Coefficient of
50ppm/°C Typical
• Temperature Compensated for Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
Description
The LM431A/LM431B/LM431C are three terminal output
adjustable regulators with thermal stability over operating
temperature range. The output voltage can be set any value
between VREF (approximately 2.5 volts) and 36 volts with
two external resistors. These devices have a typical dynamic
output impedance of 0.2Ω Active output circuit provides a
sharp turn-on characteristic, making these devices excellent
replacement for Zener Diodes in many applications.
TO-92
Internal Block Diagram
1
1. Ref 2. Anode 3. Cathode
8-DIP
8-SOP
1
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
1
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
REFERENCE
REFERENCE (R)
2.5 Vref
ANODE
CATHODE (K)
ANODE (A)
©2003 Fairchild Semiconductor Corporation
CATHODE
Rev. 1.0.7