SLVSGL3 April   2022 TPSM63603E

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics
    6. 7.6  System Characteristics
    7. 7.7  Typical Characteristics
    8. 7.8  Typical Characteristics — VIN = 12 V
    9. 7.9  Typical Characteristics — VIN = 24 V
    10. 7.10 Typical Characteristics — VIN = 36 V
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Input Voltage Range
      2. 8.3.2  Adjustable Output Voltage (FB)
      3. 8.3.3  Input Capacitors
      4. 8.3.4  Output Capacitors
      5. 8.3.5  Switching Frequency (RT)
      6. 8.3.6  Output ON and OFF Enable (EN/SYNC) and VIN UVLO
      7. 8.3.7  Frequency Synchronization (EN/SYNC)
      8. 8.3.8  Spread Spectrum
      9. 8.3.9  Power-Good Monitor (PG)
      10. 8.3.10 Adjustable Switch-Node Slew Rate (RBOOT and CBOOT)
      11. 8.3.11 Internal LDO, VCC Output, and VLDOIN Input
      12. 8.3.12 Overcurrent Protection (OCP)
      13. 8.3.13 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Active Mode
  9. 9 Applications and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design 1 — 3-A Synchronous Buck Regulator for Industrial Applications
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 9.2.1.2.2 Output Voltage Setpoint
          3. 9.2.1.2.3 Switching Frequency Selection
          4. 9.2.1.2.4 Input Capacitor Selection
          5. 9.2.1.2.5 Output Capacitor Selection
          6. 9.2.1.2.6 Other Connections
        3. 9.2.1.3 Application Curves
        4. 9.2.1.4 Design 2 — Inverting Buck-Boost Regulator with a –5-V Output
          1. 9.2.1.4.1 Design Requirements
          2. 9.2.1.4.2 Detailed Design Procedure
            1. 9.2.1.4.2.1 Output Voltage Setpoint
            2. 9.2.1.4.2.2 IBB Maximum Output Current
            3. 9.2.1.4.2.3 Switching Frequency Selection
            4. 9.2.1.4.2.4 Input Capacitor Selection
            5. 9.2.1.4.2.5 Output Capacitor Selection
            6. 9.2.1.4.2.6 Other Connections
            7. 9.2.1.4.2.7 EMI
              1. 9.2.1.4.2.7.1 EMI Plots
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
      1. 11.2.1 Package Specifications
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design With WEBENCH® Tools
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.2 Adjustable Output Voltage (FB)

The TPSM63603E has an adjustable output voltage range of 1 V to 16 V. Setting the output voltage requires two resistors, RFBT and RFBB (see Figure 8-2). Connect RFBT between VOUT, at the regulation point, and the FB pin. Connect RFBB between the FB pin and AGND (pin 10). The recommended value of RFBB is 10 kΩ. The value for RFBT can be calculated using Equation 1. Table 8-1 lists the standard resistor values for several output voltages and the recommended switching frequency. The minimum required output capacitance for each output voltage is also included in Table 8-1. The capacitance values listed represent the effective capacitance, taking into account the effects of DC bias and temperature variation.

Equation 1.
Figure 8-2 FB Resistor Divider
Table 8-1 Standard RFBT Values, Recommended fSW and Minimum COUT
VOUT (V) RFBT (kΩ)(1) Recommended fSW (kHz) COUT(MIN) (µF) (Effective) VOUT (V) RFBT (kΩ)(1) Recommended fSW (kHz) COUT(MIN) (µF) (Effective)
1.0 Short 400 300 3.3 23.2 800 40
1.2 2 500 200 5.0 40.2 1000 25
1.5 4.99 500 160 7.5 64.9 1300 20
1.8 8.06 600 120 10 90.9 1500 15
2.0 10 600 100 12 110 2000 5
2.5 15 750 65 15 140 2200 4
3.0 20 750 50 16 150 2200 3
(1) RFBB = 10 kΩ

Note that higher feedback resistances consume less DC current, which is mandatory if light-load efficiency is critical. However, RFBT larger than 1 MΩ is not recommended because the feedback path becomes more susceptible to noise. High feedback resistance generally requires more careful layout of the feedback path. It is important to keep the feedback trace as short as possible while keeping the feedback trace away from the noisy area of the PCB. For more layout recommendations, see Section 11.