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Digital power monitors with integrated shunt resistor
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INA745A

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40-V, 16-bit high-precision I²C-output digital power monitor with 800-μΩ EZShunt™ Technology

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Data sheet

INA745A

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Product details

Continuous current (max) (A) 35 Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 6.25 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 16 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, Integrated Power Monitor, Integrated Shunt, Low-side Capable Rating Catalog Operating temperature range (°C) -40 to 125
Continuous current (max) (A) 35 Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 6.25 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.1 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 2.7 Iq (max) (mA) 1 Digital interface I2C Resolution (Bits) 16 Features Alert Function, Bidirectional, Digital Temp Monitor, High precision, Integrated Power Monitor, Integrated Shunt, Low-side Capable Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (REL) 14 15 mm² 5 x 3
  • Low loss integrated shunt resistor
    • Internal resistance: 800 µΩ, TA = 25°C
    • Continuous current: ±35 A, TA = 25°C
    • Peak measurement capability: ±39.32 A
  • Current monitoring accuracy: A/B Grade, maximum
    • Offset current: ±6.25 mA / ±62.5 mA
    • Offset drift: ±30 µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • Common-mode rejection: ±0.125 / ±1.25 mA/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
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7-V to 5.5-V supply:
    • Operational current: 640 µA (typical)
    • Shutdown current: 5 µA (maximum)
  • Low loss integrated shunt resistor
    • Internal resistance: 800 µΩ, TA = 25°C
    • Continuous current: ±35 A, TA = 25°C
    • Peak measurement capability: ±39.32 A
  • Current monitoring accuracy: A/B Grade, maximum
    • Offset current: ±6.25 mA / ±62.5 mA
    • Offset drift: ±30 µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • Common-mode rejection: ±0.125 / ±1.25 mA/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
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I2C interface with 16 pin-selectable addresses
  • Operates from a 2.7-V to 5.5-V supply:
    • Operational current: 640 µA (typical)
    • Shutdown current: 5 µA (maximum)

The INA745x is a digital power monitor with an integrated current sensing element along with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±39.32 A with common-mode voltage support from –0.1 V to +40 V.

The INA745x 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 INA745x 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 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.

The INA745x is a digital power monitor with an integrated current sensing element along with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±39.32 A with common-mode voltage support from –0.1 V to +40 V.

The INA745x 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 INA745x 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 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
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* Data sheet INA745x 40 V , 16 -Bit, Precision I2C Output Digital Power Monitor with EZShunt Technology datasheet (Rev. A) PDF | HTML 19 Dec 2023
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
EVM User's guide INA740-INA741EVM, INA745-INA746EVM, INA780-INA781EVM User's Guide (Rev. A) PDF | HTML 22 Dec 2023

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