SNVSCB1E December   2022  – September 2026 TPSM33615 , TPSM33625

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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. 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  Output Voltage Selection
      3. 7.3.3  Input Capacitors
      4. 7.3.4  Output Capacitors
      5. 7.3.5  Enable, Start-Up, and Shutdown
      6. 7.3.6  External CLK SYNC (with MODE/SYNC)
        1. 7.3.6.1 Pulse-Dependent MODE/SYNC Pin Control
      7. 7.3.7  Switching Frequency (RT)
      8. 7.3.8  Power-Good Output Operation
      9. 7.3.9  Internal LDO, VCC and VOUT/FB Input
      10. 7.3.10 Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      11. 7.3.11 Spread Spectrum
      12. 7.3.12 Soft Start and Recovery from Dropout
        1. 7.3.12.1 Recovery From Dropout
      13. 7.3.13 Overcurrent Protection (Hiccup Mode)
      14. 7.3.14 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
        1. 7.4.3.1 CCM Mode
        2. 7.4.3.2 Auto Mode – Light-Load Operation
          1. 7.4.3.2.1 Diode Emulation
          2. 7.4.3.2.2 Frequency Reduction
        3. 7.4.3.3 FPWM Mode – Light-Load Operation
        4. 7.4.3.4 Minimum On-Time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Choosing the Switching Frequency
        3. 8.2.2.3  Setting the Output Voltage
        4. 8.2.2.4  Input Capacitor Selection
        5. 8.2.2.5  Output Capacitor Selection
        6. 8.2.2.6  VCC
        7. 8.2.2.7  CFF Selection
        8. 8.2.2.8  Power-Good Signal
        9. 8.2.2.9  Maximum Ambient Temperature
        10. 8.2.2.10 Other Connections
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
      3. 9.1.3 Device Nomenclature
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.2 Output Voltage Selection

Adjustable Output Voltage Variants

The TPSM336x5 output voltage can be set by two external resistors, RFBT and RFBB. Connect RFBT between VOUT at the regulation point and the FB pin. Connect RFBB between the FB pin and AGND.

The TPSM336x5 has an adjustable output voltage range from 1.0V to 15V. To confirm that the power module regulates to the desired output voltage, the typical minimum value for the parallel combination of RFBT and RFBB is 5kΩ while the typical maximum value is 10kΩ as shown in Equation 3. Equation 2 and Equation 3 can be used as a starting point to determine the value of RFBT. Reference Table 7-1 for a list of acceptable resistor values for various output voltages.

Equation 1. 5   k Ω   <   R F B T | | R F B B   ≤ 10   k Ω
Equation 2. R F B T k Ω = R F B B k Ω × V O U T   V 1V – 1
Equation 3. R F B T ≤ 10   k Ω × V O U T 1V

For adjustable output options, an addition feedforward capacitor, CFF, in parallel with the RFBT can be needed to optimize the transient response. See CFF Selection for additional information.

TPSM33615 TPSM33625 Setting Output Voltage for Adjustable Output Variant Figure 7-2 Setting Output Voltage for Adjustable Output Variant
Table 7-1 Standard RFBT Values, Recommended FSW and Minimum COUT
VOUT (V) RFBT (kΩ) (1) RECOMMENED FSW (kHz) COUT(MIN) (µF) (EFFECTIVE) VOUT (V) RFBT (kΩ) (1) RECOMMENED FSW (kHz) COUT(MIN) (µF) (EFFECTIVE)
1.0 10 400 300 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 13 120 2200 5
3.0 20 750 50 15 140 2200 4
(1) RFBB = 10kΩ