ZHCSLJ2B September   2020  – July 2021 TPS62868 , TPS62869

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Options
  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 InterfaceTiming Characteristics
    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 Power Save Mode
      2. 8.3.2 Forced PWM Mode
      3. 8.3.3 100% Duty Cycle Mode Operation
      4. 8.3.4 Start-up
      5. 8.3.5 Switch Current Limit and HICCUP Short-Circuit Protection
      6. 8.3.6 Undervoltage Lockout (UVLO)
      7. 8.3.7 Thermal Warning and Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Enable and Disable (EN)
      2. 8.4.2 Output Discharge
      3. 8.4.3 Start-Up Output Voltage and I2C Target Address Selection
        1. 8.4.3.1 TPS6286xxA Devices
        2. 8.4.3.2 TPS6286xxxC Devices
      4. 8.4.4 Select Output Voltage Registers (VID)
      5. 8.4.5 Power Good ( PG)
    5. 8.5 Programming
      1. 8.5.1 Serial Interface Description
      2. 8.5.2 Standard-, Fast-, and Fast-Mode Plus Protocol
      3. 8.5.3 HS-Mode Protocol
      4. 8.5.4 I2C Update Sequence
      5. 8.5.5 I2C Register Reset
    6. 8.6 Register Map
      1. 8.6.1 Target Address Byte
      2. 8.6.2 Register Address Byte
      3. 8.6.3 VOUT Register 1
      4. 8.6.4 VOUT Register 2
      5. 8.6.5 CONTROL Register
      6. 8.6.6 STATUS Register
  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 Setting The Output Voltage
        2. 9.2.2.2 Output Filter Design
        3. 9.2.2.3 Inductor Selection
        4. 9.2.2.4 Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 Typical Application – TPS6286x0A and TPS6286x0xC Devices
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Setting the Output Voltage
        2. 9.3.2.2 Output Filter Design
        3. 9.3.2.3 Inductor Selection
        4. 9.3.2.4 Capacitor Selection
      3. 9.3.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
      1. 11.2.1 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 第三方产品免责声明
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 支持资源
    4. 12.4 接收文档更新通知
    5. 12.5 Trademarks
    6. 12.6 术语表
    7. 12.7 Electrostatic Discharge Caution
  13. 13Mechanical, Packaging, and Orderable Information

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8.4.1 Enable and Disable (EN)

The device is enabled by setting the EN pin to a logic High. In shutdown mode (EN = Low), the internal power switches as well as the entire control circuitry are turned off, and all the registers are reset, except for the Enable Output Discharge bit. Do not leave the EN pin floating.

In shutdown mode (EN = Low), all registers cannot be read and written by the I2C interface.

The typical threshold value of the EN pin is 0.61 V for rising input signals, and 0.51 V for falling input signals.

The device is also enabled or disabled by setting the bit, Software Enable Device in CONTROL register while EN = High. After being disabled/enabled by this bit, the device stops switching and has a new start-up beginning with tRamp. There is no TDelay time and the registers are not reset.