ZHCST55A September   2023  – November 2023 TPS22999

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Electrical Characteristics (VBIAS = 5.5 V)
    6. 5.6  Electrical Characteristics (VBIAS = 3.4 V)
    7. 5.7  Electrical Characteristics (VBIAS = 2.3 V)
    8. 5.8  Switching Characteristics
    9. 5.9  Timing Diagrams
    10. 5.10 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 ON and OFF Control
      2. 6.3.2 Regulated Inrush Current
      3. 6.3.3 Integrated Quick Output Discharge
      4. 6.3.4 Thermal Shutdown
      5. 6.3.5 Power-Good (PG) Signal
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 接收文档更新通知
    2. 8.2 支持资源
    3. 8.3 Trademarks
    4. 8.4 静电放电警告
    5. 8.5 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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7.2.2 Detailed Design Procedure

When the switch is enabled, the switch charges up the output capacitance from 0 V to the set value (1.8 V in this example). This charge arrives in the form of inrush current. As the inrush current is controlled by the device, the time to fully charge up a capacitor can be calculated with the following formula:

tcharge=VIN / Iinrush × CL

where:

  • CL is the output capacitance.
  • Iinrush is the inrush current limited internally by the device
  • VIN is the input voltage

The TPS22999 offers an internally set inrush current limit (0.9-A typical with 3.4-V VBIAS), which allows the customer to calculate the time to fully charge up a load capacitance.

Equation 1. tcharge = 1.8 V / 0.9 A × 60 μF
Equation 2. tcharge = 130 µs

With TPS22999, the time to charge up a 60-μF capacitor to 1.8-V VIN voltage is 130-µs typical at 3.4-V VBIAS voltage.