SLVS543J − AUGUST 2004 − REVISED DECEMBER 2005
TL431, TL431A, TL431B
TL432, TL432A, TL432B
ADJUSTABLE PRECISION SHUNT REGULATORS
TL431, TL431A, TL431B . . . LP (TO-92/TO-226) PACKAGE
(TOP VIEW)
TL431A, TL431B . . . DCK (SC-70) PACKAGE
(TOP VIEW)
CATHODE
ANODE
REF
CATHODE
NC
REF
1
2
3
6
5
4
ANODE
NC
NC
NC − No internal connection
TL431 . . . KTP (PowerFLEXE/TO-252) PACKAGE
(TOP VIEW)
ANODE
CATHODE
ANODE
REF
description/ordering information
The TL431 and TL432 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 TL432 has exactly the same functionality and
electrical specifications as the TL431, but has different pinouts for the DBV, DBZ, and PK packages.
Both the TL431 and TL432 devices are offered in three grades, with initial tolerances (at 25°C) of 0.5%, 1%,
and 2%, for the B, A, and standard grade, respectively. In addition, low output drift vs temperature ensures good
stability over the entire temperature range.
The TL43xxC devices are characterized for operation from 0°C to 70°C, the TL43xxI devices are characterized
for operation from −40°C to 85°C, and the TL43xxQ devices are characterized for operation from −40°C to
125°C.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
