TLVH431A

* Low-Voltage Operation . . . Down to 1.24 V
* Reference Voltage Tolerances at 25
- 0.5% for B Grade
- 1% for A Grade
- 1.5% for Standard Grade
* Adjustable Output Voltage, V_O= V_REF to 18 V
*Wide Operating Cathode Current Range . . .55 A to 80 mA
* 0.25- Typical Output Impedance
* -40to 125 Specifications
* TLVH432 Provides Alternative Pinouts for SOT-23-3 and SOT-89 Packages
* Ultra-Small SC-70 Package Offers 40% Smaller Footprint Than SOT-23-3

The TLVH431A are low-voltage 3-terminal adjustable voltage references 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 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 TLVH431A are ideal voltage references in isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. They have a typical output impedance of 0.25. Active output circuitry provides a very sharp turn-on characteristic, making the TLVH431 and TLVH432 excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

The TLVH431A is identical to the TLVH431, but is offered with different pinouts for the SOT23-3 and SOT-89 packages.