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Shunt voltage references

TLVH431A-Q1

ACTIVE

Automotive, low-voltage adjustable precision shunt regulator

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Data sheet

TLVH431A-Q1

ACTIVE
Data sheet Order now

Product details

VO (V) 1.24 Initial accuracy (max) (%) 1 VO adj (min) (V) 1.24 VO adj (max) (V) 18 Iz for regulation (min) (µA) 60 Reference voltage (V) adjustable Rating Automotive Temp coeff (max) (ppm/°C) 161 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 80
VO (V) 1.24 Initial accuracy (max) (%) 1 VO adj (min) (V) 1.24 VO adj (max) (V) 18 Iz for regulation (min) (µA) 60 Reference voltage (V) adjustable Rating Automotive Temp coeff (max) (ppm/°C) 161 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 80
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8
  • Qualified for Automotive Applications
  • Low-Voltage Operation: Down to 1.24 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for B Grade
    • 1% for A Grade
  • Adjustable Output Voltage, VO = VREF to 18 V
  • Wide Operating Cathode Current Range: 100 µA to 70 mA
  • 0.25- Typical Output Impedance
  • –40°C to 125°C Specifications
  • Qualified for Automotive Applications
  • Low-Voltage Operation: Down to 1.24 V
  • Reference Voltage Tolerances at 25°C
    • 0.5% for B Grade
    • 1% for A Grade
  • Adjustable Output Voltage, VO = VREF to 18 V
  • Wide Operating Cathode Current Range: 100 µA to 70 mA
  • 0.25- Typical Output Impedance
  • –40°C to 125°C Specifications

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 . 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.

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 . 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.
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Type Title Date
* Data sheet TLVH431A-Q1, TLVH431B-Q1 Low-Voltage Adjustable Precision Shunt Regulator . datasheet (Rev. B) 28 Mar 2011
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application brief Automotive LED Lighting with Adjustable Shunt References 17 Jul 2018

Design & development

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Simulation model

TLVH431 PSpice Transient Model

SLVM672.ZIP (19 KB) - PSpice Model
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Calculation tool

SHUNT-REFERENCE-CALC — Shunt Reference Selector and Design Calculator

This tool guides the user through the design process for the TLx431 and LM40x0 family of shunt voltage references. This calculator will recommend resistance and capacitance values to optimally meet the user's desired specifications.
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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