SLVSEJ2A February   2018  – April 2018 TPSM84424

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Transient Response
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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 Switching Characteristics
    7. 6.7 Typical Characteristics (VIN = 12 V)
    8. 6.8 Typical Characteristics (VIN = 5 V)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Switching Frequency (RT)
      3. 7.3.3  Synchronization (CLK)
      4. 7.3.4  Output On/Off Enable (EN)
      5. 7.3.5  Input Capacitor Selection
      6. 7.3.6  Output Capacitor Selection
      7. 7.3.7  TurboTrans (TT)
        1. 7.3.7.1 Low-ESR Output Capacitors
        2. 7.3.7.2 Transient Response
          1. 7.3.7.2.1 Transient Waveforms (VIN = 12 V)
      8. 7.3.8  Undervoltage Lockout (UVLO)
      9. 7.3.9  Soft Start (SS/TR)
      10. 7.3.10 Sequencing (SS/TR)
      11. 7.3.11 Power Good (PGOOD)
      12. 7.3.12 Safe Start-up into Pre-Biased Outputs
      13. 7.3.13 Overcurrent Protection
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Shutdown Mode
  8. 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 Output Voltage Setpoint
        3. 8.2.2.3 Setting the Switching Frequency
        4. 8.2.2.4 Input Capacitors
        5. 8.2.2.5 Output Capacitors
        6. 8.2.2.6 TurboTrans Resistor
        7. 8.2.2.7 Application Waveforms
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 EMI
      1. 10.3.1 EMI Plots
    4. 10.4 Package Specifications
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Development Support
      1. 11.2.1 Custom Design With WEBENCH® Tools
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

Package Options

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

7.3.2 Switching Frequency (RT)

The switching frequency range of the TPSM84424 is 200 kHz to 1.6 MHz. The switching frequency can easily be set by connecting a resistor (RRT) between the RT pin and AGND. Use Equation 2 to calculate the RRT value for a desired frequency or simply select from Table 2.

The switching frequency must be selected based on the output voltage setting of the device and the operating input voltage. See Table 2 for the allowable output voltage range for a given switching frequency.

Equation 2. TPSM84424 SDRrtEq.gif

Table 2. VOUT Range vs Switching Frequency

SWITCHING FREQUENCY VIN = 5 V (±10%) VIN = 12 V (±5%) VIN = 15 V (±5%)
VOUT RANGE (V) VOUT RANGE (V) VOUT RANGE (V)
min max min max min max
250 kHz 0.6 0.9 0.6 0.8 0.6 0.8
300 kHz 0.6 0.9 0.6 0.9 0.7 0.9
350 kHz 0.6 1.0 0.7 1.0 0.8 1.0
400 kHz 0.6 1.2 0.7 1.2 0.9 1.2
450 kHz 0.6 1.8 0.8 1.5 1.0 1.5
500 kHz 0.6 2.0 0.9 1.8 1.1 1.8
550 kHz 0.6 2.2 1.0 2.0 1.2 2.0
600 kHz 0.6 2.5 1.1 2.5 1.4 2.3
650 kHz 0.6 3.0 1.2 2.7 1.5 2.5
700 kHz 0.6 3.5 1.3 3.0 1.6 2.8
750 kHz 0.6 3.5 1.4 3.3 1.7 3.0
800 kHz 0.7 3.5 1.5 3.6 1.8 3.3
900 kHz 0.7 3.5 1.6 4.0 2.0 4.0
1.0 MHz 0.9 3.5 1.8 6.0 2.2 4.8
1.1 MHz 1 3.5 2.0 9.0 2.5 6.0
1.2 MHz 1.1 3.5 2.2 9.0 2.7 8.0
1.3 MHz 1.1 3.5 2.3 9.0 2.9 10
1.4 MHz 1.2 3.5 2.4 9.0 3.1 10
1.5 MHz 1.3 3.5 2.6 9.0 3.3 10
1.6 MHz 1.4 3.5 2.8 9.0 3.5 10