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Product details

Parameters

Common mode voltage (Max) (V) 40 Common mode voltage (Min) (V) -0.2 Input offset (+/-) (Max) (uV) 12 Input offset drift (+/-) (Typ) (uV/C) 0.01 Gain (V/V) 100, 200, 25, 50, 500 Gain error (%) 0.3 Gain error drift (+/-) (Max) (ppm/°C) 7 CMRR (Min) (dB) 120 Bandwidth (kHz) 45, 37, 35, 32, 27 Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 1.7 Iq (Max) (mA) 0.09 Number of channels (#) 2 Comparators (#) 0 Features Low-side Capable, Ultra precise Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Features

  • Low power:
    • Low supply voltage, VS: 1.7 V to 5.5 V
    • Low shutdown current: 100 nA (maximum)
    • Low quiescent current: 43 µA at 25 °C (typical)
  • Low input bias currents: 100 pA (typical) (enables microamp current measurement)
  • Bidirectional current measurement (INA2191)
  • Accuracy:
    • ±0.25% max gain error (A2 to A5 devices)
    • 7-ppm/°C gain drift (maximum)
    • ±12 µV (maximum) offset voltage
    • 0.13-µV/°C offset drift (maximum)
  • Wide common-mode voltage: –0.2 V to +40 V
  • Gain options:
    • INAx191A1: 25 V/V
    • INAx191A2: 50 V/V
    • INAx191A3: 100 V/V
    • INAx191A4: 200 V/V
    • INAx191A5: 500 V/V
  • Packages:
    • INA191: 0.895-mm2 DSBGA
    • INA2191: 1.79-mm2 DSBGA

All trademarks are the property of their respective owners.

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Description

The INAx191 is a low-power, voltage-output, current-shunt monitor (also called a current-sense amplifier) that is commonly used for overcurrent protection, precision-current measurement for system optimization, or in closed-loop feedback circuits. This device can sense drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage. The low input bias current of the INAx191 permits the use of larger current-sense resistors, and thus provides accurate current measurements in the µA range. Five fixed gains are available: 25 V/V, 50 V/V, 100 V/V, 200 V/V, or 500 V/V. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement, and allows for smaller sense resistors with lower power loss while still providing accurate current measurements.

The INAx191 operates from a single 1.7-V to 5.5-V power supply, drawing a maximum of 65 µA of supply current when enabled and only 100 nA when disabled. The device is specified over the operating temperature range of –40 °C to +125 °C, and offered in a DSBGA-6 (INA191) and DSBGA-12 (INA2191) packages.

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Similar but not functionally equivalent to the compared device:
INA190 ACTIVE 40V, bi-directional, ultra-precise current sense amplifier w/picoamp IB & ENABLE Single-channel with similar performance
INA191 ACTIVE 40V, ultra-precise current sense amplifier with ENABLE and picoamp IB in WCSP Single-channel with similar performance

Technical documentation

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Type Title Date
* Datasheet INAx191 40-V, Bidirectional, Ultra-Precise Current Sense Amplifier With picoamp IB and ENABLE in WCSP Package datasheet (Rev. B) Jan. 29, 2021
Technical article How current-sense amplifiers monitor satellite health Feb. 08, 2021
User guide INA2191EVM User's Guide Jan. 19, 2021
Technical article A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Technical article System trade-offs for high- and low-side current measurements Jun. 01, 2017
Technical article Why should you care about overcurrent protection in your system? Jun. 16, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
59
Description

This module is designed to evaluate the dual-channel, high-input impedance current sense amplifier device INA2191. The evaluation module (EVM) includes on-board sockets and pads for easy and complete configuration and testing. Headers and jumpers make for quick setting of the device's reference (...)

Features
  • Pins are easily measured with test points
  • Pads, headers, and sockets allow for custom and convenient device interfacing for user specific applications
  • Quick-fit connectors make for a strong connection to a load when testing the device with a shunt resistor and loads of several amps

Design tools & simulation

SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI 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 (...)
document-generic User guide

CAD/CAE symbols

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Ordering & quality

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