SBOS401C July   2007  – April 2016 INA270A-Q1 , INA271A-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Output Voltage Range
    4. 8.4 Device Functional Modes
      1. 8.4.1 First- or Second-Order Filtering
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Basic Connection
      2. 9.1.2 Selecting RS
      3. 9.1.3 Accuracy Variations as a Result of VSENSE and Common-Mode Voltage
        1. 9.1.3.1 Normal Case 1: VSENSE ≥ 20 mV, VCM ≥ VS
        2. 9.1.3.2 Low VSENSE Case 1: VSENSE < 20 mV, -16 V ≤ VCM < 0; and Low VSENSE Case 3: VSENSE < 20 mV, VS < VCM ≤ 80 V
        3. 9.1.3.3 Low VSENSE Case 2: VSENSE < 20 mV, 0 V ≤ VCM ≤ VS
      4. 9.1.4 Transient Protection
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Shutdown
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 RFI and EMI
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

10 Power Supply Recommendations

The input circuitry of the INA27xA-Q1 can accurately measure beyond its power-supply voltage, VS. For example, the VS power supply can be 5 V, whereas the load power-supply voltage is up to 80 V. The output voltage range of the OUT terminal, however, is limited by the voltages on the power-supply pin.

10.1 Shutdown

The INA27xA-Q1 devices do not provide a shutdown pin; however, because they consume a quiescent current less than 1 mA, they can be powered by either the output of logic gates or by transistor switches to supply power. Driving the gate low shuts down the INA27xA-Q1. Use a totem-pole output buffer or gate that can provide sufficient drive along with 0.1-μF bypass capacitor, preferably ceramic with good high-frequency characteristics. This gate should have a supply voltage of 3 V or greater, because the INA27xA-Q1 requires a minimum supply greater than 2.7 V. In addition to eliminating quiescent current, this gate also turns off the 10-μA bias current present at each of the inputs.

NOTE

The IN+ and IN– inputs are able to withstand full common-mode voltage under all powered and under-powered conditions. Figure 22 shows an example of the shutdown circuit.
INA270A-Q1 INA271A-Q1 ai_shutdown_cx.gif Figure 22. INA27xA-Q1 Example Shutdown Circuit Schematic