SLYS041A March   2020  – March 2021 INA381-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Wide Input Common-Mode Voltage Range
      2. 7.3.2 Precise Low-Side Current Sensing
      3. 7.3.3 High Bandwidth and Slew Rate
      4. 7.3.4 Alert Output
      5. 7.3.5 Adjustable Overcurrent Threshold
      6. 7.3.6 Comparator Hysteresis
    4. 7.4 Device Functional Modes
      1. 7.4.1 Alert Modes
        1. 7.4.1.1 Transparent Output Mode
        2. 7.4.1.2 Latch Output Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Select a Current-Sensing Resistor
        1. 8.1.1.1 Select a Current-Sensing Resistor: Example
      2. 8.1.2 Increase Comparator Hysteresis
      3. 8.1.3 Operation With Common-Mode Transients Greater Than 26 V
      4. 8.1.4 Input Filtering
    2. 8.2 Typical Applications
      1. 8.2.1 Bidirectional Window Comparator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Solenoid Low-Side Current Sensing
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.2.1 Design Requirements

Table 8-7 lists the parameters of an application design using the INA381-Q1 and ALERT functionality to create a low-side current-sense amplifier with less than a 20-µs system shutdown.

Table 8-7 Design Parameters
DESIGN PARAMETERSEXAMPLE VALUE
Power-supply voltage5 V
Low-side current sensingVCM = 0 V
Mode of operationUnidirectional
Maximum current sense threshold4.0 A
ALERT response time< 20 µs
ALERT pin modeTransparent
RSENSE resistor5 mΩ
Gain option200 V/V