SNVSCN6 December   2023 TLVM365R1 , TLVM365R15

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  Enable, Shutdown, and Start-Up
      2. 7.3.2  Adjustable Switching Frequency (With RT)
      3. 7.3.3  Power-Good Output Operation
      4. 7.3.4  Internal LDO, VCC UVLO, and VOUT/FB Input
      5. 7.3.5  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      6. 7.3.6  Output Voltage Selection
      7. 7.3.7  Soft Start and Recovery from Dropout
        1. 7.3.7.1 Soft Start
        2. 7.3.7.2 Recovery from Dropout
      8. 7.3.8  Current Limit and Short Circuit
      9. 7.3.9  Thermal Shutdown
      10. 7.3.10 Input Supply Current
    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 Minimum On-time Operation
        4. 7.4.3.4 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  External UVLO
        9. 8.2.2.9  Power-Good Signal
        10. 8.2.2.10 Maximum Ambient Temperature
        11. 8.2.2.11 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
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    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

Package Options

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

7.4.3.1 CCM Mode

The following operating description of the TLVM365R1x refers to Section 7.2 and to the waveforms in Figure 7-10. The TLVM365R1x operates in AUTO mode while lightly loaded. Regardless of the light load operation configuration, the converter operates in CCM when the load current is greater than half the inductor ripple current.

In CCM, the TLVM365R1x supplies a regulated output voltage by turning on the internal high-side (HS) and low-side (LS) switches with varying duty cycle (D). During the HS switch on-time, the SW pin voltage, VSW, swings up to approximately VIN, and the inductor current, iL, increases with a linear slope. The HS switch is turned off by the control logic. During the HS switch off-time, tOFF, the LS switch is turned on. Inductor current discharges through the LS switch, which forces the VSW to swing below ground by the voltage drop across the LS switch. The converter loop adjusts the duty cycle to maintain a constant output voltage. Duty cycle is defined by the on-time of the HS switch over the switching period:

Equation 3. D = TON / TSW

In an ideal buck converter where losses are ignored, duty cycle is proportional to the output voltage and inversely proportional to the input voltage:

Equation 4. D = VOUT / VIN
GUID-0950EE8A-DA5F-48A7-859F-1DC8148600EB-low.svgFigure 7-10 SW Voltage and Inductor Current Waveforms in Continuous Conduction Mode (CCM)