SLVSFS5A October   2021  – November 2021 TPSM63603

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
    6. 6.6  System Characteristics
    7. 6.7  Typical Characteristics
    8. 6.8  Typical Characteristics: VIN = 12 V
    9. 6.9  Typical Characteristics: VIN = 24 V
    10. 6.10 Typical Characteristics: VIN = 36 V
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Range
      2. 7.3.2  Adjustable Output Voltage (FB)
      3. 7.3.3  Input Capacitors
      4. 7.3.4  Output Capacitors
      5. 7.3.5  Switching Frequency (RT)
      6. 7.3.6  Output ON/OFF Enable (EN/SYNC) and VIN UVLO
      7. 7.3.7  Frequency Synchronization (EN/SYNC)
      8. 7.3.8  Spread Spectrum
      9. 7.3.9  Power Good Monitor (PG)
      10. 7.3.10 Adjustable Switch-Node Slew Rate (RBOOT/CBOOT)
      11. 7.3.11 Internal LDO, VCC Output, and VLDOIN Input
      12. 7.3.12 Overcurrent Protection (OCP)
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
  8. 8 Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1: 3-A Synchronous Buck Regulator for Industrial Applications
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Output Voltage Setpoint
          3. 8.2.1.2.3 Switching Frequency Selection
          4. 8.2.1.2.4 Input Capacitor Selection
          5. 8.2.1.2.5 Output Capacitor Selection
          6. 8.2.1.2.6 Other Connections
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2: Inverting Buck-Boost Regulator with a –5-V Output
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Output Voltage Setpoint
          2. 8.2.2.2.2 IBB Maximum Output Current
          3. 8.2.2.2.3 Switching Frequency Selection
          4. 8.2.2.2.4 Input Capacitor Selection
          5. 8.2.2.2.5 Output Capacitor Selection
          6. 8.2.2.2.6 Other Connections
        3. 8.2.2.3 Application Curves
        4. 8.2.2.4 EMI
          1. 8.2.2.4.1 EMI Plots
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
      1. 10.2.1 Package Specifications
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.5 Switching Frequency (RT)

The switching frequency range of the TPSM63603 is 200 kHz to 2.2 MHz. The switching frequency can easily be set by connecting a resistor (RRT) between the RT pin and AGND. Use Equation 5 to calculate the RRT value for a desired frequency or simply select from Table 7-4. Note that a resistor value outside of the recommended range can cause the device to shut down. This prevents unintended operation if RT pin is shorted to ground or left open. Do not apply a pulsed signal to this pin to force synchronization. If synchronization is needed, refer to Section 7.3.7.

The switching frequency must be selected based on the output voltage setting of the device. See Table 7-4 for RRT resistor values and the allowable output voltage range for a given switching frequency for common input voltages.

Equation 5.
Table 7-4 Switching Frequency Versus Output Voltage (IOUT = 3 A)
FSW (kHz) RRT (kΩ) VIN = 5 V VIN = 12 V VIN = 24 V VIN = 36 V
VOUT RANGE (V) VOUT RANGE (V) VOUT RANGE (V) VOUT RANGE (V)
MIN MAX MIN MAX MIN MAX MIN MAX
200 66.5 1.0 2.0 1.0 2.0 1.0 1.5 1.0 1.5
400 33.2 1.0 3.0 1.0 4.0 1.0 3.3 1.2 3.0
600 22.1 1.0 3.5 1.0 6.0 1.5 6.0 1.8 5.0
800 16.5 1.0 3.5 1.0 7.0 1.5 9.0 2.5 7.0
1000 13.0 1.0 3.0 1.0 8.0 2.0 12.0 3.0 10.0
1200 10.7 1.0 3.0 1.5 9.0 2.5 13.0 3.5 14.0
1400 9.09 1.0 3.0 1.5 9.5 3.0 14.0 4.0 16.0
1600 8.06 1.0 3.0 1.5 9.0 3.0 15.0 4.5 16.0
1800 6.98 1.0 3.0 2.0 9.0 3.5 16.0 5.0 16.0
2000 6.34 1.2 2.5 2.0 9.0 4.0 16.0 5.5 16.0
2200 5.626 1.2 2.5 2.0 9.0 4.5 16.0 6.0 16.0