Datasheet Texas Instruments TLVH431A-Q1

TLVH431A-Q1
TLVH431B-Q1
SLVS906B – DECEMBER 2008 – REVISED MARCH 2011 www.ti.com LOW-VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATORS
Check for Samples: TLVH431A-Q1, TLVH431B-Q1 FEATURES 1 Qualified for Automotive Applications
Low-Voltage Operation: Down to 1.24 V
Reference Voltage Tolerances at 25В°C
– 0.5% for B Grade
– 1% for A Grade
Adjustable Output Voltage, VO = VREF to 18 V
Wide Operating Cathode Current Range:
100 ОјA to 70 mA
0.25-Ω Typical Output Impedance
–40°C to 125°C Specifications DESCRIPTION/ORDERING INFORMATION
The TLVH431 devices are low-voltage 3-terminal adjustable voltage references, with thermal stability specified
over the automotive temperature range. Output voltage can be set to any value between VREF (1.24 V) and 18 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 TLVH431 devices are ideal voltage reference in isolated feedback circuits
for 3-V to 3.3-V switching-mode power supplies. They have a typical output impedance of 0.25 Ω. Active output
circuitry provides a very sharp turn-on characteristic, making the TLVH431 an excellent replacement for
low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.
ORDERING INFORMATION (1)
TA –40В°C to 125В°C (1) …