TLV431_06 Datasheet, PDF (1/31 Pages) Texas Instruments – LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS

TLV431, TLV431A, TLV431B
LOWĆVOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
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
D Typical Temperature Drift
− 4 mV (05C to 705C)
− 6 mV (–405C to 855C)
− 11 mV (–405C to 1255C)
SLVS139S − JULY 1996 − REVISED JANUARY 2006
D Low Operational Cathode Current . . .
80 µA Typ
D 0.25-Ω Typical Output Impedance
D Ultra-Small SC-70 Package Offers 40%
Smaller Footprint Than SOT-23-3
D 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
D (SOIC) PACKAGE
(TOP VIEW)
DBV (SOT-23-5) PACKAGE
(TOP VIEW)
DBZ (SOT-23-3) PACKAGE
(TOP VIEW)
CATHODE ¹
ANODE ²
ANODE ³
NC ⁴
8 REF
7 ANODE
6 ANODE
5 NC
NC 1
*2
CATHODE 3
5 ANODE
4 REF
REF 1
CATHODE 2
NC − No internal connection
* For TLV431, TLV431A: NC − No internal connection
* For TLV431B: Pin 2 is attached to Substrate and
must be connected to ANODE or
left open.
3 ANODE
PK (SOT-89) PACKAGE
(TOP VIEW)
DCK (SC-70) PACKAGE
(TOP VIEW)
ANODE
3 CATHODE
2 ANODE
1 REF
CATHODE 1
NC 2
REF 3
6 ANODE
5 NC
4 NC
NC − No internal connection
description/ordering information
LP (TO-92/TO-226) PACKAGE
(TOP VIEW)
CATHODE
ANODE
REF
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.
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Copyright  2006, Texas Instruments Incorporated
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