TL431, TL431A
ADJUSTABLE PRECISION SHUNT REGULATORS
SLVS005J – JULY 1978 – REVISED JULY 1999
D
D
D
D
D
D
Equivalent Full-Range Temperature
Coefficient . . . 30 ppm/°C
0.2-Ω Typical Output Impedance
Sink-Current Capability . . . 1 mA to 100 mA
Low Output Noise
Adjustable Output Voltage . . . V
ref
to 36 V
Available in a Wide Range of High-Density
Packages
D PACKAGE
(TOP VIEW)
CATHODE
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
P OR PW PACKAGE
(TOP VIEW)
description
The TL431 and TL431A are three-terminal
adjustable shunt regulators with specified thermal
stability over applicable automotive, commercial,
and military temperature ranges. The output
voltage can be set to any value between V
ref
(approximately 2.5 V) and 36 V with two external
resistors (see Figure 17). These devices have a
typical output impedance of 0.2
Ω.
Active output
circuitry provides a very sharp turn-on
characteristic, making these devices excellent
replacements for Zener diodes in many
applications, such as onboard regulation,
adjustable power supplies, and switching power
supplies.
The TL431C and TL431AC are characterized for
operation from 0°C to 70°C, and the TL431I and
TL431AI are characterized for operation from
–40°C to 85°C.
CATHODE
NC
NC
NC
1
2
3
4
8
7
6
5
REF
NC
ANODE
NC
NC – No internal connection
PK PACKAGE
(TOP VIEW)
REF ANODE CATHODE
LP PACKAGE
(TOP VIEW)
CATHODE
ANODE
REF
KTP PACKAGE
(TOP VIEW)
CATHODE
ANODE
ANODE
REF
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
©
1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
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