SLUSBN5C August   2013  – February 2026 TPS53515

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  5V LDO and VREG Start-Up
      2. 6.3.2  Enable, Soft Start, and Mode Selection
      3. 6.3.3  Frequency Selection
      4. 6.3.4  D-CAP3 Control and Mode Selection
        1. 6.3.4.1 D-CAP3™ Control Mode
        2. 6.3.4.2 Sample and Hold Circuitry
        3. 6.3.4.3 Adaptive Zero-Crossing
      5. 6.3.5  Power-Good
      6. 6.3.6  Current Sense and Overcurrent Protection
      7. 6.3.7  Overvoltage and Undervoltage Protection
      8. 6.3.8  Out-of-Bounds Operation
      9. 6.3.9  UVLO Protection
      10. 6.3.10 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Auto-Skip Eco-mode Light Load Operation
      2. 6.4.2 Forced Continuous-Conduction Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Choose the Switching Frequency
        2. 7.2.2.2 Choose the Operation Mode
        3. 7.2.2.3 Choose the Inductor
        4. 7.2.2.4 Choose the Output Capacitor
        5. 7.2.2.5 Determine the Value of R1 and R2
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Thermal Performance
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.3 Frequency Selection

The TPS53515 device lets users select the switching frequency by using the RF pin. Table 6-1 lists the divider ratio and some example resistor values for the switching frequency selection. The 1% tolerance resistors with a typical temperature coefficient of ±100ppm/°C are recommended. If the design requires a tighter noise margin for more reliable SW-frequency detection, use higher performance resistors.

Table 6-1 Switching Frequency Selection
SWITCHING FREQUENCY
(fSW) (kHz)		RESISTOR
DIVIDER RATIO(1)
(RDR)		EXAMPLE RF FREQUENCY COMBINATIONS
RRF_H (kΩ)RRF_L (kΩ)
1000> 0.5571300
8500.461180154
7500.375200120
6000.297249105
5000.22924071.5
4000.1624947.5
3000.09625527
250< 0.04127011.5
(1) Resistor divider ratio (RDR) is described in Equation 1.

Equation 1. TPS53515

where

  • RRF_L is the low-side resistance of the RF pin resistor divider
  • RRF_H is the high-side resistance of the RF pin resistor divider