SLVSC71B December   2013  – March 2020 TPS22966-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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: VBIAS = 5 V
    6. 6.6 Electrical Characteristics: VBIAS = 2.5 V
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
      1. 6.8.1 Typical AC Scope Captures at TA = 25ºC, CT = 1 nF
  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 Quick Output Discharge
      2. 8.3.2 ON/OFF Control
      3. 8.3.3 Adjustable Rise Time
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Input Capacitor (Optional)
      2. 9.1.2 Output Capacitor (Optional)
      3. 9.1.3 VIN and VBIAS Voltage Range
      4. 9.1.4 Safe Operating Area (SOA)
    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. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Support Resources
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.2 Detailed Design Procedure

When the switch is enabled, the output capacitors must be charged up from 0 V to the set value (3.3 V in this example). This charge arrives in the form of inrush current. Inrush current can be calculated using Equation 2:

Equation 2. Inrush Current = C × dV/dt

where

  • C = output capacitance
  • dV = output voltage
  • dt = rise time

The TPS22966-Q1 offers adjustable rise time for VOUT. This feature allows the user to control the inrush current during turnon. The appropriate rise time can be calculated using Table 3 and the inrush current equation.

Equation 3. 400 mA = 22 μF × 3.3 V/dt
Equation 4. dt = 181.5 μs

To ensure an inrush current of less than 400 mA, choose a CT value that will yield a rise time of more than 181.5 μs. See the oscilloscope captures in for an example of how the CT capacitor can be used to reduce inrush current.