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Texas Instruments ATL43xLI/ATL43xLI-Q1 Programmable Shunt Regulator

TTexas Instruments ATL43xLI/ATL43xLI-Q1 Programmable Shunt Regulator is a three-terminal adjustable shunt regulator with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5V) and 36V, with two external resistors. These devices have a typical output impedance of 0.3Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications. These applications include onboard regulation, adjustable power and switching power supplies. This device is a pin-to-pin alternative to the TL431LI and TL432LI, with a lower minimum operating current to help reduce system power consumption.

The Texas Instruments ATL432LI/ATL432LI-Q1 device has precisely the same functionality and electrical specifications as the ATL431LI/ATL431LI-Q1 device but has a different pinout for the DBZ package. The ATL431LI/ATL43xLI-Q1 device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grades, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range. The ATL43xLIxQ devices are characterized for operation from –40°C to +125°C.

Features

  • Reference voltage tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • 2.5V minimum typical output voltage
  • Vref to 36V adjustable output voltage 
  • Operation from −40°C to +125°C (Q temp)
  • Maximum temperature drift
    • 17mV (I Temp)
    • 27mV (Q Temp)
  • 0.3Ω typical output impedance
  • Sink-current capability
    • Imin = 0.1mA (max)
    • IKA = 15mA (max)
  • 0.4µA (max) reference input current IREF 
  • 0.3µA (max) deviation of reference input current over temperature, II(dev)

Applications

  • Adjustable voltage and current referencing
  • Secondary side regulation in flyback SMPS
  • Zener diode replacement
  • Voltage monitoring
  • Precision constant current sink/source
  • Comparator with integrated reference

Datasheets

Functional Block Diagram

Block Diagram - Texas Instruments ATL43xLI/ATL43xLI-Q1 Programmable Shunt Regulator

Associated Development Tool

Texas Instruments ATL431LIEVM Evaluation Module

An adjustable-voltage reference board that evaluates the ATL431LI device in a small X2SON package.

Learn Moreacerca de Texas Instruments ATL431LIEVM Evaluation Module View Productsrelacionado con Texas Instruments ATL431LIEVM Evaluation Module
Publicado: 2019-01-08 | Actualizado: 2023-05-24