SNVSCI2B February   2023  – February 2024 TLVM23615 , TLVM23625

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  Switching Frequency (RT)
      7. 7.3.7  Power-Good Output Operation
      8. 7.3.8  Internal LDO, VCC and VOUT/FB Input
      9. 7.3.9  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      10. 7.3.10 Soft Start and Recovery from Dropout
        1. 7.3.10.1 Recovery from Dropout
      11. 7.3.11 Overcurrent Protection (Hiccup Mode)
      12. 7.3.12 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 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.2 Output Voltage Selection

The TLVM236x5 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 TLVM236x5 has an adjustable output voltage range from 1.0 V to 6 V. To ensure that the power module regulates to the desired output voltage, the typical minimum value for the parallel combination of RFBT and RFBB is 5 kΩ while the typical maximum value is 10 kΩ 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 1 V – 1
Equation 3. R F B T ≤ 10   k Ω × V O U T 1 V

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.

GUID-086C6E25-2FA6-4E37-A8FE-391B9E9A9480-low.svg 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)
1.0 10 400 300
1.2 2 500 200
1.5 4.99 500 160
1.8 8.06 600 120
2.0 10 600 100
2.5 15 750 65
3.0 20 750 50
3.3 23.2 800 40
5.0 40.2 1000 25
(1) RFBB = 10 kΩ