SLCS142H December   2003  – May 2025 LM2901-Q1 , LM2901AV-Q1 , LM2901B-Q1 , LM2901V-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings for  LM2901B-Q1
    2. 5.2  Absolute Maximum Ratings for LM2901x-Q1
    3. 5.3  ESD Ratings
    4. 5.4  Recommended Operating Conditions for LM2901B-Q1
    5. 5.5  Recommended Operating Conditions for LM2901x-Q1
    6. 5.6  Thermal Information
    7. 5.7  Electrical Characteristics for LM2901B-Q1
    8. 5.8  Switching Characteristics for LM2901B-Q1
    9. 5.9  Electrical Characteristics for LM2901x-Q1
    10. 5.10 Switching Characteristics for LM2901x-Q1
    11. 5.11 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram Schematic (Each Comparator)
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
      1. 6.4.1 Voltage Comparison
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Input Voltage Range
        2. 7.2.2.2 Minimum Overdrive Voltage
        3. 7.2.2.3 Output and Drive Current
        4. 7.2.2.4 Response Time
      3. 7.2.3 Application Curves
      4. 7.2.4 Application Information Disclaimer
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Related Links
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3 Feature Description

The comparator consists of a PNP darlington pair input, allowing the device to operate with very high gain and fast response with minimal input bias current. The input Darlington pair creates a limit on the input common mode voltage capability, allowing the comparator to accurately function from ground to VCC– 2V over temperature. On the non-B devices, a clamp was added around Q3 to mimic the both inputs above input voltage range behavior of the original classic silicon.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN sinks current when the negative input voltage is higher than the positive input voltage and the offset voltage. The VOL is resistive and scales with the output current. Please see the "Output Low Voltage vs. Output Sinking Current" graphs for VOL values with respect to the output current.