SLVSGT2A June   2022  – December 2022 TPS22995H-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 = 3.3 V)
    7. 6.7 Electrical Characteristics (VBIAS = 1.5 V)
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  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 ON and OFF Control
      2. 8.3.2 Quick Output Discharge (QOD)
      3. 8.3.3 Adjustable Slew Rate
      4. 8.3.4 Thermal Shutdown
    4. 8.4 Device Functional Modes
  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. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, 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 VIN. This charge arrives in the form of inrush current. Use the equation below to calculate inrush current.

Equation 2. IINRUSH = CL × dVOUT/dt

where

  • CL is the output capacitance.
  • dVOUT is the change in VOUT during the ramp up of the output voltage when device is enabled.
  • dt is the rise time in VOUT during the ramp up of the output voltage when the device is enabled.
The TPS22995H-Q1 offers an adjustable rise time for VOUT, allowing the user to control the inrush current during turn-on. The appropriate rise time can be calculated using the design requirements and the inrush current equation as shown below.
Equation 3. 200 mA = 47uF × 5 V/dt

where

Equation 4. dt = 1175 us

The TPS22995H-Q1 has very fast rise times with RT pin grounded. The typical rise time is 147 μs at VBIAS = 5V, VIN = 5 V, RL = 100 Ω, and CL = 0.1 µF. This rise time results in an inrush current of 1.59 A. According to the rise time table, using RT = 10 kΩ results in a rise time of 1520 us, which limits the inrush current to 154 mA. Alternatively, the rise time equation can be used to determine the resistor need.