ZHCSKC9B July   2019  – November 2019 LP3470A

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      基本工作电路
      2.      LP3470A 典型电源电流
  4. 4 修订历史记录
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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 Timing Requirements
    7. 7.7 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 RESET Time-Out Period
      2. 8.3.2 RESET Output
      3. 8.3.3 Pull-up Resistor Selection
      4. 8.3.4 VCC Transient Immunity
    4. 8.4 Device Functional Modes
      1. 8.4.1 RESET Output Low
      2. 8.4.2 RESET Output High
  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
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 接收文档更新通知
    2. 12.2 支持资源
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 Glossary
  13. 13机械、封装和可订购信息

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

8.3.3 Pull-up Resistor Selection

The RESET output structure of the LP3470A is an open-drain N-channel MOSFET switch. A pull-up resistor (Rpull-up) must be connected to VCC to keep the output logic high when RESET is not asserted.

Connect the pull-up resistor to the desired pull-up voltage source and RESET can be pulled up to any voltage up to 10 V independent of the VCC voltage. To ensure proper voltage levels, give some consideration when choosing the pull-up resistor values. Rpull-up must be large enough to limit the current through the output within the recommended operating conditions. The pull-up resistor value determines the actual VOL, the output capacitive loading, and the output leakage current (ILKG(OD)). A typical pull-up resistor value of 20 kΩ is sufficient in most applications.