SBOS793C April 2017  – December 2017 INA181 , INA2181 , INA4181

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configurations and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagrams
    3. 8.3Feature Description
      1. 8.3.1High Bandwidth and Slew Rate
      2. 8.3.2Bidirectional Current Monitoring
      3. 8.3.3Wide Input Common-Mode Voltage Range
      4. 8.3.4Precise Low-Side Current Sensing
      5. 8.3.5Rail-to-Rail Output Swing
    4. 8.4Device Functional Modes
      1. 8.4.1Normal Mode
      2. 8.4.2Unidirectional Mode
      3. 8.4.3Bidirectional Mode
      4. 8.4.4Input Differential Overload
      5. 8.4.5Shutdown Mode
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Basic Connections
      2. 9.1.2RSENSE and Device Gain Selection
      3. 9.1.3Signal Filtering
      4. 9.1.4Summing Multiple Currents
      5. 9.1.5Detecting Leakage Currents
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
      3. 9.2.3Application Curve
  10. 10Power Supply Recommendations
    1. 10.1Common-Mode Transients Greater Than 26 V
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
    2. 12.2Documentation Support
      1. 12.2.1Related Documentation
    3. 12.3Related Links
    4. 12.4Receiving Notification of Documentation Updates
    5. 12.5Community Resources
    6. 12.6Trademarks
    7. 12.7Electrostatic Discharge Caution
    8. 12.8Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Features

  • Common-Mode Range (VCM): –0.2 V to +26 V
  • High Bandwidth: 350 kHz (A1 Devices)
  • Offset Voltage:
    • ±150 µV (Max) at VCM = 0 V
    • ±500 µV (Max) at VCM = 12 V
  • Output Slew Rate: 2 V/µs
  • Bidirectional Current-Sensing Capability
  • Accuracy:
    • ±1% Gain Error (Max)
    • 1-µV/°C Offset Drift (Max)
  • Gain Options:
    • 20 V/V (A1 Devices)
    • 50 V/V (A2 Devices)
    • 100 V/V (A3 Devices)
    • 200 V/V (A4 Devices)
  • Quiescent Current: 260 µA Max (INA181)

Applications

  • Motor Control
  • Battery Monitoring
  • Power Management
  • Lighting Control
  • Overcurrent Detection
  • Solar Inverters

Description

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in a 6-pin, SOT-23 package, the INA2181 is available in an 10-pin VSSOP package, and the INA4181 is available in a 20-pin TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
INA181SOT-23 (6)2.90 mm × 1.60 mm
INA2181VSSOP (10)3.00 mm × 3.00 mm
INA4181(2)TSSOP (20)6.50 mm × 4.40 mm
  1. For all available packages, see the package option addendum at the end of the data sheet.
  2. INA4181 is preview device.

Typical Application Circuit

INA181 INA2181 INA4181 ina181-front-page-diagram.gif