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INA740B

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

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Data sheet

INA740B

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Product details

Continuous current (max) (A) 35 Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 62.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.3 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 Rating Catalog Operating temperature range (°C) -40 to 125
Continuous current (max) (A) 35 Common-mode voltage (max) (V) 85 Common-mode voltage (min) (V) -0.1 Input offset current (±) (max) (mA) 62.5 Input offset current drift (±) (typ) (µA/°C) 5 Gain error (%) 0.3 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 Rating Catalog Operating temperature range (°C) -40 to 125
VQFN (REM) 14 20 mm² 5 x 4
  • Low loss integrated shunt resistor
    • Internal resistance: 800 µΩ, T A = 25°C
    • Continuous current: ±35 A, T A = 25°C
    • Peak measurement capability: ±39.32 A
  • Wide common-mode range: –0.1 V to +85 V
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy: A/B Grade, maximum
    • Offset current: ±6.25 mA / ±62.5 mA
    • Offset drift: ±25 µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • System gain error drift: ±25 PPM/°C, typical
    • Common-mode rejection: ±0.125 / ±1.25 mA/V
  • Power monitoring accuracy: A/B Grade, maximum
    • ±0.85% / ±1.55% at 25°C, full scale
  • Energy and charge accuracy: A/B Grade, maximum
    • ±1.35% / ±2.05% at 25°C, full scale
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I 2C 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, T A = 25°C
    • Continuous current: ±35 A, T A = 25°C
    • Peak measurement capability: ±39.32 A
  • Wide common-mode range: –0.1 V to +85 V
  • High-resolution, 16-bit delta-sigma ADC
  • Current monitoring accuracy: A/B Grade, maximum
    • Offset current: ±6.25 mA / ±62.5 mA
    • Offset drift: ±25 µA/°C (A and B Grades)
    • System gain error: ±0.75% / ±1.25%
    • System gain error drift: ±25 PPM/°C, typical
    • Common-mode rejection: ±0.125 / ±1.25 mA/V
  • Power monitoring accuracy: A/B Grade, maximum
    • ±0.85% / ±1.55% at 25°C, full scale
  • Energy and charge accuracy: A/B Grade, maximum
    • ±1.35% / ±2.05% at 25°C, full scale
  • Input bias current: 2.5 nA (maximum)
  • Temperature sensor: ±1.5°C (maximum at 25°C)
  • Programmable conversion time and averaging
  • 2.94-MHz high-speed I 2C 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 INA740x 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 +85 V.

The INA740x 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 INA740x 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 INA740x 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 +85 V.

The INA740x 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 INA740x 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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Technical documentation

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* Data sheet INA740x 85 V, 16-Bit, Precision I2C Output Digital Power Monitor with EZShunt Technology datasheet PDF | HTML 07 Jul 2023
EVM User's guide INA740-INA741EVM, INA745-INA746EVM, INA780-INA781EVM User's Guide PDF | HTML 26 Jun 2023
Certificate INA740BEVM EU Declaration of Conformity (DoC) 19 May 2023

Design & development

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Evaluation board

INA740-INA741EVM — INA740 and INA741 evaluation module for EZShunt™ Digital Power Monitor with built-in shunt resistor

The INA740 and IN741 evaluation module (EVM) is a compact platform for evaluating the main features and performance of the INA740 or INA741 high-precision digital power monitors with EZShunt™ Technology across specified input current, common-mode voltage and temperature ranges. (...)

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IDE, configuration, compiler or debugger

ASC-STUDIO-INA740 — ASC Studio (SysConfig) for configuring all aspects of the INA740 current sensor

SysConfig can be used to help simplify configuration challenges and accelerate software development with the INA740 current sensor.
Supported products & hardware

Supported products & hardware

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Digital power monitors with integrated shunt resistor
INA740A — 85-V, 16-bit high-precision I²C-output digital power monitor with 800-µΩ EZShunt™ Technology INA740B — 85-V 16-bit I²C-output digital power monitor with 800-µΩ EZShunt™ Technology
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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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