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Texas Instruments INA745x/INA745x-Q1 Digital Power Monitor

Texas Instruments INA745x/INA745x-Q1 I2C-Output Digital Power Monitor has an integrated current-sensing element and a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±39.32A with common-mode voltage support from –0.1V to +40V. The INA745x/INA745x-Q1 reports current, bus voltage, die temperature, power, energy, and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±2.5°C accurate over the junction temperature range.

The low offset and gain drift design of the Texas Instruments INA745x/INA745x-Q1 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. The device allows for selectable ADC conversion times from 50µs to 4.12ms and sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data. The INA745x-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Low-loss integrated shunt resistor
    • Internal resistance: 800µΩ, TA = 25°C
    • Continuous current: ±35A, TA = 25°C
    • Peak measurement capability: ±39.32A
  • Current monitoring accuracy: A/B Grade, maximum
    • Offset current: ±6.25mA/±62.5mA
    • Offset drift: ±30µA/°C (A and B Grades)
    • System gain error: ±0.75%/±1.25%
    • Common-mode rejection: ±0.125/±1.25mA/V
  • Power monitoring accuracy: A/B Grade, maximum
    • ±0.9%/±1.6% at 25°C, full scale
  • Energy and charge accuracy: A/B Grade, maximum
    • ±1.4%/±2.1% at 25°C, full scale
  • ±1.5°C (maximum at 25°C) temperature sensor
  • ±0.5% (maximum at 25°C) precision oscillator
  • Programmable conversion time and averaging
  • 2.94MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7V to 5.5V supply
    • Operational current: 640µA (typical)
    • Shutdown current: 5µA (maximum)

Applications

  • Power delivery
  • Grid infrastructure
  • Industrial battery packs
  • Test equipment
  • Telecom equipment
  • Enterprise servers

Datasheets

Functional Block Diagram

Block Diagram - Texas Instruments INA745x/INA745x-Q1 Digital Power Monitor

Related Development Tool

INA74xEVM/INA78xEVM Evaluation Modules (EVMs)

Texas Instruments INA74xEVM/INA78xEVM Evaluation Modules (EVMs)

Evaluates the main features & performance of the INA780, INA781, INA740, INA741, INA745, and INA746.

Learn Moretungkol sa Texas Instruments INA74xEVM/INA78xEVM Evaluation Modules (EVMs) View Productskaugnay ng Texas Instruments INA74xEVM/INA78xEVM Evaluation Modules (EVMs)
Inilathala: 2024-03-05 | Na-update: 2025-09-03