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TLVH432

ACTIVE

1.5% low-voltage wide-operating current adjustable precision shunt regulator (reverse pinout)

Product details

VO (V) 1.24 Initial accuracy (max) (%) 1.5 VO adj (min) (V) 1.24 VO adj (max) (V) 18 Iz for regulation (min) (µA) 60 Reference voltage (V) adjustable Rating Catalog Temp coeff (max) (ppm/°C) 138 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 80
VO (V) 1.24 Initial accuracy (max) (%) 1.5 VO adj (min) (V) 1.24 VO adj (max) (V) 18 Iz for regulation (min) (µA) 60 Reference voltage (V) adjustable Rating Catalog Temp coeff (max) (ppm/°C) 138 Operating temperature range (°C) -40 to 125 Iout/Iz (max) (mA) 80
SOT-23 (DBZ) 3 6.9204 mm² 2.92 x 2.37 SOT-89 (PK) 3 18.4275 mm² 4.5 x 4.095
  • Low-voltage operation: down to 1.24 V
  • Reference voltage tolerances at 25°C
    • 0.5% for B grade
    • 1% for A grade
    • 1.5% for standard grade
  • Adjustable output voltage, VO = VREF to 18 V
  • Wide operating cathode current range: 100 µA to 70 mA
  • 0.25-Ω typical output impedance
  • –40°C to +125°C 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
  • Low-voltage operation: down to 1.24 V
  • Reference voltage tolerances at 25°C
    • 0.5% for B grade
    • 1% for A grade
    • 1.5% for standard grade
  • Adjustable output voltage, VO = VREF to 18 V
  • Wide operating cathode current range: 100 µA to 70 mA
  • 0.25-Ω typical output impedance
  • –40°C to +125°C 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 TLVH431 and TLVH432 devices 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 VREF (1.24 V) and 18 V with two external resistors (see Figure 7-2). 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 and TLVH432 devices 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 Ω. Active output circuitry provides a very sharp turn-on characteristic, making the TLVH431 and TLVH432 devices excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

The TLVH432 device is identical to the TLVH431 device, but is offered with different pinouts for the 3-pin SOT-23 and SOT-89 packages.

The TLVH431 and TLVH432 devices 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 VREF (1.24 V) and 18 V with two external resistors (see Figure 7-2). 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 and TLVH432 devices 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 Ω. Active output circuitry provides a very sharp turn-on characteristic, making the TLVH431 and TLVH432 devices excellent replacements for low-voltage Zener diodes in many applications, including on-board regulation and adjustable power supplies.

The TLVH432 device is identical to the TLVH431 device, but is offered with different pinouts for the 3-pin SOT-23 and SOT-89 packages.

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Technical documentation

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Type Title Date
* Data sheet TLVH431, TLVH432 Low-Voltage Adjustable Precision Shunt Regulators datasheet (Rev. M) PDF | HTML 26 Jan 2023
Application note Optimization of a Shunt Reference for Flyback Converters PDF | HTML 18 Oct 2023
Application note Using the TL431 for Undervoltage and Overvoltage Detection (Rev. A) 11 Dec 2019
Selection guide 431 Device Nomenclature (Rev. B) 18 Sep 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note Setting the shunt voltage on an adjustable shunt regulator 01 Sep 2011
More literature SLL Precision Reference Product Clip 23 Feb 2006

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ATL431EVM-001 — ATL431 adjustable shunt regulator evaluation module

The ATL431EVM-001 evaluation module (EVM) features the functionality and adjustability of the ATL431 by letting you program the cathode voltage with various resistor values. You can also set the cathode current using the various resistors in series with the supply. (...)

User guide: PDF
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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 (...)
Reference designs

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This reference design demonstrates a buck converter using UCC28881 that converts a 120Vac input to a 3.3Vdc output. The use of a coupled inductor helps maintain a longer on-time while achieving an extreme conversion ratio for a non-isolated topology. Like other buck topologies, this design makes a (...)
Test report: PDF
Reference designs

PMP9208 — 65W (130W Surge) Flyback Power Supply for Laptop Adapter Apps w/85-265VAC Input Reference Design

The PMP9208 is a power adapter reference design for 19.5V output, constant voltage / constant current, 65W flyback power supply with 130W surge capability. Primary side regulation eliminates feedback opto-coupler and provides 1% regulation down to no-load. Average efficiency of > 89% and no load (...)
Test report: PDF
Schematic: PDF
Package Pins Download
SOT-23 (DBZ) 3 View options
SOT-89 (PK) 3 View options

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