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Digital power monitors with integrated shunt resistor
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INA745B-Q1

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AEC-Q100, 40-V 16-bit I²C-output digital power monitor with 800-µΩ EZShunt™ Technology

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Data sheet

INA745B-Q1

ACTIVE
Data sheet Order now

Product details

Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Continuous current (max) (A) 35 Input offset current (±) (max) (mA) 62.5 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, Integrated Power Monitor, Integrated Shunt, Low-side Capable, Standard precision Rating Automotive Operating temperature range (°C) -40 to 125
Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.1 Continuous current (max) (A) 35 Input offset current (±) (max) (mA) 62.5 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, Integrated Power Monitor, Integrated Shunt, Low-side Capable, Standard precision Rating Automotive Operating temperature range (°C) -40 to 125
VQFN (REL) 14 15 mm² 5 x 3
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • 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
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • 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)
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • 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
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Precision oscillator: ±0.5% (maximum at 25°C)
  • 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)

The INA745x-Q1 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 ±39.32A with common-mode voltage support from –0.1V to +40V.

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

The INA745x-Q1 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 ±39.32A with common-mode voltage support from –0.1V to +40V.

The 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 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 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-Q1 AEC-Q100, 40V , 16 -Bit, Precision I2C Output Digital Power Monitor With EZShunt Technology datasheet (Rev. A) PDF | HTML 03 Oct 2025
Functional safety information INA74X-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 08 May 2025
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024

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