SLVSGT0 December   2022 TPS22997

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 (VBIAS = 5 V)
    9. 6.9  Switching Characteristics (VBIAS = 3.3 V)
    10. 6.10 Switching Characteristics (VBIAS = 1.5 V)
    11. 6.11 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 Adjustable Slew Rate
      3. 8.3.3 Adjustable Quick Output Discharge
      4. 8.3.4 Thermal Shutdown
      5. 8.3.5 Power Good (PG) Signal
    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. 9.2.3 Application Performance Plots
    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

8.3.2 Adjustable Slew Rate

A capacitor to GND on the CT pin sets the slew rate, and the higher the capacitance the lower the slew rate. The voltage on the CT pin can be as high as 15 V; therefore, the minimum voltage rating for the CT capacitor must be 30 V for optimal performance. Rise times for VBIAS = 5 V are shown below.

CT Capacitor

VIN = 5 V

VIN = 3.3 V

VIN = 1.8 V

VIN = 1.2 V

VIN = 0.8 V

0 pF

165 µs

126 µs

86 µs

66 µs

51 µs

220 pF

309 µs

221 µs

137 µs

99 µs

74 µs

1000 pF

819 µs

554 µs

319 µs

222 µs

160 µs

4700 pF

3260 µs

2170 µs

1210 µs

829 µs

575 µs

The following equation can be used to estimate the rise time for different VIN and CT capacitors at VBIAS = 5 V.

Equation 1. tR = (0.1302 VIN + 0.0063) × CT + 27.797 VIN + 30.54

Where:

  • tR = Rise time in µs

  • VIN = Input voltage in V

  • CT = CT capacitance in pF