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Analog current-sense amplifiers

INA191

ACTIVE

40V, ultra-precise current sense amplifier with ENABLE and picoamp IB in WCSP

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Data sheet

INA191

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 12 Input offset drift (±) (typ) (µV/°C) 0.01 Features Low-side Capable, Small WCSP Package, Ultra precise Rating Catalog Voltage gain (V/V) 25, 50, 100, 200, 500 CMRR (min) (dB) 132 Bandwidth (kHz) 27, 33, 35, 37, 45 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 1.7 Iq (max) (mA) 0.085 Number of channels 1 Comparators (#) 0 Gain error (%) 0.25, 0.35 Gain error drift (±) (max) (ppm/°C) 7 Slew rate (V/µs) 0.3 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -0.2 Input offset (±) (max) (µV) 12 Input offset drift (±) (typ) (µV/°C) 0.01 Features Low-side Capable, Small WCSP Package, Ultra precise Rating Catalog Voltage gain (V/V) 25, 50, 100, 200, 500 CMRR (min) (dB) 132 Bandwidth (kHz) 27, 33, 35, 37, 45 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 1.7 Iq (max) (mA) 0.085 Number of channels 1 Comparators (#) 0 Gain error (%) 0.25, 0.35 Gain error drift (±) (max) (ppm/°C) 7 Slew rate (V/µs) 0.3 Operating temperature range (°C) -40 to 125
DSBGA (YFD) 6 1.4000000000000001 mm² 1.4000000000000001 x 1
  • Low power:
    • Supply voltage, V S: 1.7 V to 5.5 V
    • Shutdown current: 100 nA (max INA191)
    • Quiescent current: 43 µA at 25 °C (INA191)
  • 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-mm 2 DSBGA
    • INA2191: 1.79-mm 2 DSBGA
  • Low power:
    • Supply voltage, V S: 1.7 V to 5.5 V
    • Shutdown current: 100 nA (max INA191)
    • Quiescent current: 43 µA at 25 °C (INA191)
  • 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-mm 2 DSBGA
    • INA2191: 1.79-mm 2 DSBGA

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 INA191 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.

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 INA191 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

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* Data sheet INAx191 40-V, Bidirectional, Ultra-Precise Current Sense Amplifier With picoamp IB and ENABLE in WCSP Package datasheet (Rev. C) PDF | HTML 02 Aug 2021
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Technical article Why current and magnetic sensing matters for wireless earbud design PDF | HTML 11 Nov 2019
Technical article The need for current sensing in optical modules for 100G and beyond PDF | HTML 15 Mar 2019
Application brief Precision, Low-Side Current Measurement (Rev. B) 06 Mar 2019
Application brief External current sense amps vs integrated onboard amplifiers for current sensing (Rev. B) 19 Feb 2019

Design & development

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

Evaluation board

INA191EVM — INA191 evaluation module

This is a small module with five completely independent boards that can be broken off by the user. Five identical boards (15-A 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 (...)
User guide: PDF
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Simulation model

INA191 TINA-TI Reference Design (Rev. A)

SLYM111A.TSC (186 KB) - TINA-TI Reference Design
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Simulation model

INA191 TINA-TI Spice Model (Rev. A)

SLYM110A.ZIP (62 KB) - TINA-TI Spice Model
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Simulation model

INA191A1 PSpice Model

SLYM114.ZIP (29 KB) - PSpice Model
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Simulation model

INA191A2 PSpice Model

SLYM113.ZIP (29 KB) - PSpice Model
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Simulation model

INA191A3 PSpice Model

SLYM116.ZIP (30 KB) - PSpice Model
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Simulation model

INA191A4 PSpice Model

SLYM115.ZIP (30 KB) - PSpice Model
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Simulation model

INA191A5 PSpice Model

SLYM112.ZIP (30 KB) - PSpice Model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

Supported products & hardware

Supported products & hardware
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Calculation tool

CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware

Supported products & hardware
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
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Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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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Simulation tool

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 (...)
User guide: PDF
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Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

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 (...)

Design guide: PDF
Schematic: PDF
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