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INA740B
  • INA740B
  • INA740B

INA740B

ACTIVE

85-V 16-bit I²C-output digital power monitor with 800-µΩ EZShunt™ Technology

Texas Instruments INA740B Product Info

1 April 2026 3

Parameters

Common-mode voltage (max) (V)

85

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 Accumulator, Integrated Power Monitor, Integrated Shunt, Low-side Capable, Standard precision

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Package

VQFN (REM)-14-20 mm² 5 x 4

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: (maximum)
    • Offset current: ±62.5mA
    • Offset drift: ±30µA/°C
    • System gain error: ±1.25%
    • Common-mode rejection: ±1.25mA/V
  • Power monitoring accuracy: (maximum)
    • ±1.6% at 25°C, full scale
  • Energy and charge accuracy: (maximum)
    • ±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)
  • 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: (maximum)
    • Offset current: ±62.5mA
    • Offset drift: ±30µA/°C
    • System gain error: ±1.25%
    • Common-mode rejection: ±1.25mA/V
  • Power monitoring accuracy: (maximum)
    • ±1.6% at 25°C, full scale
  • Energy and charge accuracy: (maximum)
    • ±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)

Description

The INA740B 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 +85V.

The INA740B 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 INA740B 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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