SNOSD87A July   2021  – February 2022 LM74501-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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Input Voltage
      2. 8.3.2 Charge Pump
      3. 8.3.3 Enable
      4. 8.3.4 Gate Driver
      5. 8.3.5 SW (Battery Voltage Monitoring)
      6. 8.3.6 Gate Discharge Timer
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Full Conduction Mode
      3. 8.4.3 VDS Clamp
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Reverse Battery Protection
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Design Considerations
        2. 9.2.2.2 MOSFET Selection
        3. 9.2.2.3 Gate Discharge Timer Capacitor Selection (CT)
        4. 9.2.2.4 Charge Pump VCAP, Input and Output Capacitance
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

5 Pin Configuration and Functions

GUID-20210621-CA0I-FL1V-L6HS-P74MGXMC3VZP-low.gifFigure 5-1 DDF Package8-Pin SOT-23(LM74501-Q1 Top View)
Table 5-1 LM74501-Q1 Pin Functions
PINI/O(1)DESCRIPTION
NO.NAME
1GATEOGate drive output. Connect to the gate of the external N-channel MOSFET.
2SOURCEIConnect to the source of the external N-channel MOSFET. This pin also acts as the input supply for the device.
3VCAPOCharge pump output. Connect to an external charge pump capacitor.
4SWIVoltage sensing disconnect switch terminal. SOURCE and SW are internally connected through a switch when EN is high. A resistor ladder from this pin to GND can be used to monitor battery voltage. When EN is pulled low, the switch is OFF, disconnecting the resistor ladder from the battery line, thereby cutting off the leakage current.
5GNDGGround pin
6ENIEnable pin. Can be connected to SOURCE for always ON operation.
7N.CNANo connect. Keep this pin floating.
8DRAINIConnect to the drain of the external N-channel MOSFET.
(1) I = Input, O = Output, G = GND