TLV431, TLV431A, TLV431B
LOW VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
SLVS139R − JULY 1996 − REVISED SEPTEMBER 2005
D
Low-Voltage Operation . . . V
REF
= 1.24 V
D
Adjustable Output Voltage, V
O
= V
REF
to 6 V
D
Reference Voltage Tolerances at 255C
− 0.5% for TLV431B
− 1% for TLV431A
− 1.5% for TLV431
Typical Temperature Drift
− 4 mV (05C to 705C)
− 6 mV (–405C to 855C)
− 11 mV (–405C to 1255C)
D (SOIC) PACKAGE
(TOP VIEW)
D
Low Operational Cathode Current . . .
D
D
D
D
80
µA
Typ
0.25-Ω Typical Output Impedance
Ultra-Small SC-70 Package Offers 40%
Smaller Footprint Than SOT-23-3
See TLVH431 and TLVH432 for
− Wider V
KA
(1.24 V to 18 V) and I
K
(80 mA)
− Additional SOT-89 Package
− Multiple Pinouts for SOT-23-3 and SOT-89
Packages
DBZ (SOT-23-3) PACKAGE
(TOP VIEW)
DBV (SOT-23-5) PACKAGE
(TOP VIEW)
CATHODE
ANODE
ANODE
NC
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
NC
*
CATHODE
1
2
3
5
4
ANODE
REF
REF
CATHODE
1
3
2
ANODE
NC − No internal connection
* For TLV431, TLV431A: NC − No internal connection
* For TLV431B: Leave open or connect to ANODE
DCK (SC-70) PACKAGE
(TOP VIEW)
LP (TO-92/TO-226) PACKAGE
r
(TOP VIEW)
PK (SOT-89) PACKAGE
(TOP VIEW)
3
CATHODE
ANODE
REF
ANODE
2
1
CATHODE
NC
REF
1
2
3
6
5
4
ANODE
NC
NC
CATHODE
ANODE
REF
NC - No internal connection
description/ordering information
The TLV431 is a low-voltage 3-terminal adjustable voltage reference with specified thermal stability over
applicable industrial and commercial temperature ranges. Output voltage can be set to any value between V
REF
(1.24 V) and 6 V with two external resistors (see Figure 2). These devices operate from a lower voltage
(1.24 V) than the widely used TL431 and TL1431 shunt-regulator references.
When used with an optocoupler, the TLV431 is an ideal voltage reference in isolated feedback circuits for 3-V
to 3.3-V switching-mode power supplies. These devices have a typical output impedance of 0.25
Ω.
Active
output circuitry provides a very sharp turn-on characteristic, making them excellent replacements for
low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.
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.
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.
Copyright
2005, Texas Instruments Incorporated
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
1
TI [ TEXAS INSTRUMENTS ]
