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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 (#) 1 Comparators (#) 0 Features Low-side Capable, Small WCSP Package Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

DSBGA (YFD) 6 1 mm² .8 x 1.21 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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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
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 articles How current-sense amplifiers monitor satellite health Feb. 08, 2021
Technical articles Why current and magnetic sensing matters for wireless earbud design Nov. 10, 2019
User guide INA191EVM User's Guide (Rev. A) Apr. 10, 2019
Technical articles The need for current sensing in optical modules for 100G and beyond Mar. 15, 2019
Application note Precision, Low-Side Current Measurement (Rev. B) Mar. 06, 2019
Application note External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) Feb. 19, 2019
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018

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
25
Description
This is a small module with 5 completely independent boards that can be broken off by the user. Five identical boards (15A rating) can be used for the five device gain variants. Each board provides test points for VS, GND, OUT and ENABLE. Additionally, boards are compatible with 1206 to 0603 shunt (...)
Features
This is a small module with 5 completely independent boards that can be broken off by the user. Five identical boards (15A rating) can be used for the five device gain variants. Each board provides test points for VS, GND, OUT and ENABLE. Additionally, boards are compatible with 1206 to 0603 shunt (...)

Design tools & simulation

SIMULATION MODEL Download
SLYM110A.ZIP (62 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLYM111A.TSC (186 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLYM112.ZIP (30 KB) - PSpice Model
SIMULATION MODEL Download
SLYM113.ZIP (29 KB) - PSpice Model
SIMULATION MODEL Download
SLYM114.ZIP (29 KB) - PSpice Model
SIMULATION MODEL Download
SLYM115.ZIP (30 KB) - PSpice Model
SIMULATION MODEL Download
SLYM116.ZIP (30 KB) - PSpice Model
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
CALCULATION TOOL Download
SBOR020A.ZIP (525 KB)

Reference designs

REFERENCE DESIGNS Download
Current Shunt Monitor with Transient Robustness Reference Design
TIDA-00302 This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
DSBGA (YFD) 6 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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