TI TLVH431AIDCKR

The TLVH431 and TLVH432 devices are low-voltage, 3-terminal adjustable voltage references with rated thermal stability over the applicable industrial and commercial temperature ranges. The output voltage can be set to any value between VREF (1.24V) and 18V using two external resistors. These devices have a lower operating voltage (1.24V) than the widely used TL431 and TL1431 shunt regulator references. When used with optocouplers, the TLVH431 and TLVH432 devices are ideal voltage references for isolated feedback circuits in 3V to 3.3V switch-mode power supplies. Their typical output impedance is 0.25Ω. The active output circuit provides very fast turn-on characteristics, so the TLVH431 and TLVH432 devices are well-suited to replace low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

• Low voltage operation: down to 1.24V
• Reference voltage tolerance at 25°C – Grade B: 0.5% – Grade A: 1% – Standard grade: 1.5%
• Adjustable output voltage, V₀ = VREF to 18V
• Wide operating cathode current range: 100μA to 70mA
• Typical output impedance 0.25Ω
• -40°C to +125°C specifications
• TLVH432 offers alternative pin configurations for SOT-23-3 and SOT-89 packages
• Ultra-compact SC-70 package — 40% smaller than SOT-23-3

• Adjustable voltage reference for data converters
• Secondary-side regulation in flyback SMPS
• Zener diode replacement with low leakage current
• Power rail voltage monitoring
• Comparator with integrated reference