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INA250

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36V, bi-directional, precision current sense amplifier w/int. shunt resistor

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36V, bi-directional, precision current sense amplifier w/int. shunt resistor

INA250

ACTIVE
Data sheet Order now

Product details

Parameters

Common mode voltage (Max) (V) 36 Common mode voltage (Min) (V) 0 Input offset (+/-) (Max) (uV) 100mA, 50mA, 30mA, 20mA Input offset drift (+/-) (Typ) (uV/C) 250uA/C Gain (V/V) 2000mV/A, 200mV/A, 500mV/A, 800mV/A Gain error (%) 0.3 Gain error drift (+/-) (Max) (ppm/°C) 45 CMRR (Min) (dB) 100 Bandwidth (kHz) 50 Supply voltage (Max) (V) 36 Supply voltage (Min) (V) 2.7 Iq (Max) (mA) 0.35 Number of channels (#) 1 Comparators (#) 0 Features Bi-directional, Integrated Shunt, Low-side Capable Rating Catalog Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 open-in-new Find other Current sense amplifiers analog output

Features

  • Precision Integrated Shunt Resistor:
    • Shunt Resistor: 2 mΩ
    • Shunt Resistor Tolerance: 0.1% (Max)
    • 15 A Continuous from –40°C to 85°C
    • 0°C to 125°C Temperature Coefficient:
      10 ppm/°C
  • High Accuracy:
    • Gain Error (Shunt and Amplifier): 0.3% (Max)
    • Offset Current: 50 mA (Max, INA250A2)
  • Four Available Gains:
    • INA250A1: 200 mV/A
    • INA250A2: 500 mV/A
    • INA250A3: 800 mV/A
    • INA250A4: 2 V/A
  • Wide Common-Mode Range: –0.1 V to 36 V
  • Specified Operating Temperature: –40°C to 125°C
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Description

The INA250 is a voltage-output, current-sensing amplifier family that integrates an internal shunt resistor to enable high-accuracy current measurements at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, low- or high-side current-shunt monitor that allows an external reference to be used to measure current flowing in both directions through the internal current-sensing resistor sensor. The integration of the precision current-sensing resistor provides calibration equivalent measurement accuracy with ultra-low temperature drift performance and ensures an optimized Kelvin layout for the sensing resistor is always obtained.

The INA250 family is available in four output voltage scales: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A. This device is fully tested and specified for continuous currents up to 10 amps at the maximum temperature of 125°C. The INA250 operates from a single 2.7-V to 36-V supply and draws a maximum of 300 µA of supply current. All INA250 gain versions are specified over the extended operating temperature range (–40°C to 125°C), and are available in a TSSOP-16 package.

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Technical documentation

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Type Title Date
* Datasheet INA250 36-V, Low- or High-Side, Bidirectional, Zero-Drift Current-Shunt Monitor with Precision Integrated Shunt Resistor datasheet (Rev. B) Dec. 18, 2015
More literature Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Application notes Precision, Low-Side Current Measurement (Rev. B) Mar. 06, 2019
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Application notes Integrating a Current Sense Resistor With a Current Sense Amplifier (Rev. B) Jul. 20, 2018
Selection guides Current Sense Amplifiers (Rev. D) Apr. 04, 2018
Application notes Integrated-Resistor Current Sensors Simplify PCB Design Jun. 30, 2017
Application notes Benefits of Intergated Low Inductive Shunt for PWM Applications Jun. 17, 2017
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
User guides INA250EVM User Guide (Rev. A) Dec. 03, 2015
Technical articles How to get started with current sense amplifiers – part 3 Jul. 09, 2015
User guides 30-A Range Bidirectional Current Shunt Monitor Design Guide Jun. 30, 2015
User guides INA250EVM User Guide Mar. 12, 2015

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

INA250 is a family of current shunt monitor with integrated shunt. The INA250EVM (INA250AxEVM) is intended to provide basic functional evaluation of INA250A1, INA250A2, INA250A3 and INA250A4 devices in the family. The fixture layout is not intended to be a model for the target circuit, nor is it (...)

Features
  • INA250EVM consists of one PCB with an option to cut out four individual PCBs one for each of the four devices (INA250A1, INA250A2, INA250A3 and INA250A4).
  • Ease of access to all device pins.
  • Optional input filter.
  • Banana jack terminals on IN+ and IN- pins for ease of connection.

 

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Design tools & simulation

SIMULATION MODELS Download
SBOM963.ZIP (33 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBOM964.TSC (612 KB) - TINA-TI Reference Design
SIMULATION TOOLS 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

Reference designs

REFERENCE DESIGNS Download
High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30A Range Bidirectional Current Shunt Monitor Reference Design
TIDA-00614 — This verified design can accurately measure current across a range of 30 A on a bus that carries up to 36-V common mode voltage over a range of -40°C to +85°C.  This design can measure current from 0 A to 30 A with a grounded reference or -30 A to 0 A with a 16-V reference.  The (...)
document-generic Schematic document-generic User guide
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
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CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options

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Training series

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Videos

Getting Started with Current Sense Amplifiers, Session 16: Benefits of Integrated Precision Shunt Resistor

Discusses how to integrating a precision shunt resistor will enhance the system implementation

Posted: 15-Jan-2016
Duration: 04:18

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