SBOS775C September   2016  – March 2019 INA302 , INA303

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Bidirectional Current Sensing
      2. 7.3.2 Out-of-Range Detection
      3. 7.3.3 Alert Outputs
        1. 7.3.3.1 Setting Alert Thresholds
          1. 7.3.3.1.1 Resistor-Controlled Current Limit
            1. 7.3.3.1.1.1 Resistor-Controlled Current Limit: Example
          2. 7.3.3.1.2 Voltage-Source-Controlled Current Limit
        2. 7.3.3.2 Hysteresis
    4. 7.4 Device Functional Modes
      1. 7.4.1 Alert Operating Modes
        1. 7.4.1.1 Transparent Output Mode
        2. 7.4.1.2 Latch Output Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Selecting a Current-Sensing Resistor (RSENSE)
        1. 8.1.1.1 Selecting a Current-Sensing Resistor: Example
      2. 8.1.2 Input Filtering
      3. 8.1.3 Using the INA30x With Common-Mode Transients Greater Than 36 V
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 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 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2 Detailed Design Procedure

To achieve bidirectional monitoring, drive the reference pin halfway between the supply with a resistor divider buffered by an op amp, as shown in Table 5. To reduce the current draw from the supply, use 100-kΩ resistors to create the divide-by-two voltage divider. The TLV313-Q1 is selected to buffer the voltage divider because this device can operate from a single-supply rail with low IQ and offset voltage. To minimize the response time of the ALERT2 output, a 100-kΩ pullup resistor was added from the DELAY pin to the VS pin. Select values for RSENSE, RLIMIT2, and RLIMIT1 based on the desired current-sense levels and trip thresholds using the information in the Resistor-Controlled Current Limit and Selecting a Current-Sensing Resistor (RSENSE) sections. For this example, the values of RLIMIT1 and RLIMIT2 were selected so that the positive and negative overcurrent thresholds are the same. Table 5 shows the alert output of the INA303 application circuit with the capability to detect both positive and negative overcurrent conditions.

Table 5. Bidirectional Overcurrent Output Status

OVERCURRENT PROTECTION (OCP) STATUS OUTPUT
Positive overcurrent detection (OCP+) 0
Negative overcurrent detection (OCP–) 0
Normal operation (no OCP) 1