ZHCSO25A December   2021  – May 2022 LM74502 , LM74502H

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  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 (VCAP)
      3. 8.3.3 Gate Driver (GATE, SRC)
        1. 8.3.3.1 Inrush Current Control
      4. 8.3.4 Enable (EN/UVLO)
      5. 8.3.5 Overvoltage Protection (OV)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Conduction Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    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 Overvoltage Protection
        4. 9.2.2.4 Charge Pump VCAP, Input and Output Capacitance
      3. 9.2.3 Application Curves
    3. 9.3 Input Surge Stopper Using LM74502, LM74502H
      1. 9.3.1 VS Capacitance, Resistor R1 and Zener Clamp (DZ)
      2. 9.3.2 Overvoltage Protection
      3. 9.3.3 MOSFET Selection
    4. 9.4 Fast Turn-On and Turn-Off High Side Switch Driver Using LM74502H
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 接收文档更新通知
    2. 12.2 支持资源
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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5 Pin Configuration and Functions

Figure 5-1 DDF Package8-Pin SOT-23LM74502, LM74502H Top View
Table 5-1 LM74502, LM74502H Pin Functions
PINI/O(1)DESCRIPTION
NO.NAME
1EN/UVLOIEN/UVLO Input. Connect to VS pin for always ON operation. Can be driven externally from a micro controller I/O. Pulling the pin low below V(ENF) makes the device enter into low Iq shutdown mode. For UVLO, connect an external resistor ladder from input supply to EN/UVLO to ground.
2GNDGGround pin
3N.C

—

No connection
4VCAPOCharge pump output. Connect to external charge pump capacitor.
5VSIInput power supply pin to the controller. Connect a 100-nF capacitor across VS and GND pins.
6GATEOGate drive output. Connect to gate of the external N-channel MOSFET.
7OV

I

Adjustable overvoltage threshold input. Connect a resistor ladder from input supply to OV pin to ground. When the voltage at OV pin exceeds the overvoltage cutoff threshold then the GATE is pulled low. GATE turns ON when the OV pin voltage goes below the OVP falling threshold. Connect OV pin to ground when OV feature is not used.

8SRC

I

Source pin. Connect to common source point of external back-to-back connected N-channel MOSFETs or the source pin of the high side switch MOSFET.

(1) I = Input, O = Output, G = GND