ZHCSIH0C December   2017  – June 2021 LP87702-Q1

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 说明（续）
  6. 6 Pin Configuration and 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 I2C Serial Bus Timing Parameters
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Descriptions
      1. 8.3.1  Step-Down DC/DC Converters
        1. 8.3.1.1 Overview
        2. 8.3.1.2 Transition Between PWM and PFM Modes
        3. 8.3.1.3 Buck Converter Load Current Measurement
      2. 8.3.2  Boost Converter
      3. 8.3.3  Spread-Spectrum Mode
      4. 8.3.4  Sync Clock Functionality
      5. 8.3.5  Power-Up
      6. 8.3.6  Buck and Boost Control
        1. 8.3.6.1 Enabling and Disabling Converters
        2. 8.3.6.2 Changing Buck Output Voltage
      7. 8.3.7  Enable and Disable Sequences
      8. 8.3.8  Window Watchdog
      9. 8.3.9  Device Reset Scenarios
      10. 8.3.10 Diagnostics and Protection Features
        1. 8.3.10.1 Voltage Monitorings
        2. 8.3.10.2 Interrupts
        3. 8.3.10.3 Power-Good Information to Interrupt, PG0, and PG1 Pins
          1. 8.3.10.3.1 PGx Pin Gated (Unusual) Mode
          2. 8.3.10.3.2 PGx Pin Operation in Continuous Mode
          3. 8.3.10.3.3 Summary of PG0, PG1 Gated, and Continuous Operating Modes
        4. 8.3.10.4 Warning Interrupts for System Level Diagnostics
          1. 8.3.10.4.1 Output Power Limit
          2. 8.3.10.4.2 Thermal Warning
        5. 8.3.10.5 Protections Causing Converter Disable
          1. 8.3.10.5.1 Short-Circuit and Overload Protection
          2. 8.3.10.5.2 Overvoltage Protection
          3. 8.3.10.5.3 Thermal Shutdown
        6. 8.3.10.6 Protections Causing Device Power Down
          1. 8.3.10.6.1 Undervoltage Lockout
      11. 8.3.11 OTP Error Correction
      12. 8.3.12 Operation of GPO Signals
      13. 8.3.13 Digital Signal Filtering
    4. 8.4 Device Functional Modes
      1. 8.4.1 Modes of Operation
    5. 8.5 Programming
      1. 8.5.1 I2C-Compatible Interface
        1. 8.5.1.1 Data Validity
        2. 8.5.1.2 Start and Stop Conditions
        3. 8.5.1.3 Transferring Data
        4. 8.5.1.4 I2C-Compatible Chip Address
        5. 8.5.1.5 Auto Increment Feature
    6. 8.6 Register Maps
      1. 8.6.1 Register Descriptions
        1. 8.6.1.1 LP8770_map Registers
  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 Application Components
          1. 9.2.2.1.1 Inductor Selection
          2. 9.2.2.1.2 Buck Input Capacitor Selection
          3. 9.2.2.1.3 Buck Output Capacitor Selection
          4. 9.2.2.1.4 Boost Input Capacitor Selection
          5. 9.2.2.1.5 Boost Output Capacitor Selection
          6. 9.2.2.1.6 Supply Filtering Components
      3. 9.2.3 Current Limit vs Maximum Output Current
      4. 9.2.4 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 第三方产品免责声明
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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8.3.10.5.3 Thermal Shutdown

The LP87702-Q1 has an overtemperature protection function that operates to protect itself from short-term misuse and overload conditions. The converters are disabled immediately (without switching ramp or shutdown delays), the TDIE_SD_INT bit is set to 1, the nINT signal is pulled low, and the device enters STANDBY when the junction temperature exceeds around 150°C. The nINT is cleared by writing 1 to the TDIE_SD_INT bit. If the temperature is above thermal shutdown level, the interrupt is not cleared. The host can read the status of the thermal shutdown from the TDIE_SD_STAT bit. Converters cannot be enabled as long as the junction temperature is above the thermal shutdown level or the thermal shutdown interrupt is pending.