1 Features

? Qualified for automotive applications

? AEC-Q100 qualified with the following results:

– Device temperature grade 1: -40°C to 125°C

ambient operating temperature range

? Low-voltage operation, VREF = 1.24V

? Adjustable output voltage, VO = VREF to 6V

? Reference voltage tolerances at 25°C

– 0.5% for TLV431B

– 1% for TLV431A

? Typical temperature drift

– 11mV (–40°C to 125°C)

? Low operational cathode current, 80μA typical

? 0.25Ω Typical output impedance

? See TLVH431 and TLVH432 for:

– Wider VKA (1.24V to 18V) and IK (80mA)

– Multiple pinouts for SOT-23-3 and SOT-89

packages

2 Applications

? Adjustable voltage and current referencing

? Secondary side regulation in flyback SMPSs

? Zener replacement

? Voltage monitoring

? Comparator with integrated reference

3 Description

The TLV431 device 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

1.24V on stand alone mode or any value between

VREF (1.24V) and 6V with two external resistors (see

Figure 6-2). These devices operate from a lower

voltage (1.24V) than the widely used TL431 and

TL1431 shunt-regulator references.

When used with an optocoupler, the TLV431 device

is a voltage reference in isolated feedback circuits

designed for 3V to 3.3V switching-mode power

supplies. These devices have a typical output

impedance of 0.25Ω. 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.