1 Features

• Qualified for automotive applications

• AEC-Q100 test guidance with the following:

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

ambient operating temperature range

• Reference voltage tolerance at 25°C:

– 1% (A Grade)

– 0.5% (B Grade)

• Typical temperature drift:

– 14 mV (Q Temp)

• Low output noise

• 0.2-Ω Typical output impedance

• Sink-current capability: 1 mA to 100 mA

• Adjustable output voltage: VREF to 36 V

2 Applications

• Adjustable voltage and current referencing

• Secondary side regulation in flyback SMPSs

• Zener replacement

• Voltage monitoring

• Comparator with integrated reference

3 Description

The TL431LI-Q1 / TL432LI-Q1 are pin-to-pin

alternatives to TL431-Q1 / TL432-Q1. TL43xLI-Q1

offers better stability, lower temperature drift

(VI(dev)), and lower reference current (Iref) for

improved system accuracy.

The TL431-Q1 is a three-pin adjustable shunt

regulator with specified thermal stability over

applicable automotive temperature ranges. The

output voltage can be set to any value from VREF

(approximately 2.5 V) to 36 V, with two external

resistors (see Figure 28). This device has a typical

output impedance of 0.2 Ω. Active output circuitry

provides a sharp turnon characteristic, making this

device an excellent replacement for Zener diodes in

many applications, such as onboard regulation,

adjustable power supplies, and switching power

supplies.

The TL432-Q1 has exactly the same functionality and

electrical specifications as the TL431-Q1 device, but

has a different pinout for the DBZ package.