SNOSD36A August   2017  – December 2017 LPV821

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Low-Side, Always-On Current Sense
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions: LPV821 DBV
    2.     Pin Functions: LPV822 DSG (Preview)
  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 Operating Voltage
      2. 8.3.2 Input
      3. 8.3.3 Internal Offset Correction
      4. 8.3.4 Input Offset Voltage Drift
    4. 8.4 Device Functional Modes
      1. 8.4.1 EMI Performance and Input Filtering
      2. 8.4.2 Driving Capacitive Load
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Low-Side Current Measurement
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 General Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
    2. 12.2 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.1 Low-Side Current Measurement

This single-supply, low-side, current-sensing solution shown in Figure 40 detects load currents up to 1 A. This design uses the LPV821 because of its low offset voltage and rail-to-rail input and output. The LPV821 in the main signal path is configured as a difference amplifier and a second LPV821 provides a buffered bias voltage to allow transition of signal below and above the bias level for bi-direction current sensing. The low offset voltage and offset drift of the LPV821 facilitate excellent dc accuracy for the circuit.

LPV821 LS_Current_sense.gifFigure 40. Low-Side Current Measurement