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TLV431, TLV431A, TLV431B

SLVS139V – JULY 1996 – REVISED JANUARY 2015

TLV431x Low-Voltage Adjustable Precision Shunt Regulator

1 Features

2 Applications

1

•

•

Adjustable Voltage and Current Referencing

•

•

Secondary Side Regulation in Flyback SMPSs

•

Reference Voltage Tolerances at 25°C

•

Zener Replacement

•

Voltage Monitoring

–

0.5% for TLV431B

•

Comparator with Integrated Reference

–

1% for TLV431A

–

1.5% for TLV431

3 Description

•

Typical Temperature Drift

The TLV431 device is a low-voltage 3-terminal

–

4 mV (0°C to 70°C)

adjustable voltage reference with specified thermal

–

6 mV (–40°C to 85°C)

stability over applicable industrial and commercial

temperature ranges. Output voltage can be set to any

–

11 mV (–40°C to 125°C)

•

Low Operational Cathode Current, 80 µA Typ

external resistors (see Figure 20). These devices

•

0.25-

Ω Typical Output Impedance

operate from a lower voltage (1.24 V) than the widely

used TL431 and TL1431 shunt-regulator references.

•

Ultra-Small SC-70 Package Offers 40% Smaller

Footprint Than SOT-23-3

When used with an optocoupler, the TLV431 device

•

See TLVH431 and TLVH432 for:

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

–

Additional SOT-89 Package

impedance of 0.25

Ω. Active output circuitry provides

–

Multiple Pinouts for SOT-23-3 and SOT-89

a very sharp turn-on characteristic, making them

Packages

excellent replacements for low-voltage Zener diodes

in many applications, including on-board regulation

•

On Products Compliant to MIL-PRF-38535,

and adjustable power supplies.

All Parameters Are Tested Unless Otherwise

Noted. On All Other Products, Production

Device Information(1)

Processing Does Not Necessarily Include Testing

PART NUMBER

PACKAGE (PIN)

BODY SIZE (NOM)

of All Parameters.

SOT-23 (3)

2.90 mm x 1.30 mm

SOT-23 (5)

2.90 mm x 1.60 mm

TLV431x

SC70 (6)

2.00 mm x 1.25 mm

TO-92 (3)

4.30 mm × 4.30 mm

SOIC (8)

4.90 mm x 3.90 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

4 Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.