SLVSCS9D december   2014  – may 2023 TPS65263-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  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 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  Adjusting the Output Voltage
      2. 7.3.2  Enable and Adjusting UVLO
      3. 7.3.3  Soft-Start Time
      4. 7.3.4  Power-Up Sequencing
      5. 7.3.5  V7V Low-Dropout Regulator and Bootstrap
      6. 7.3.6  Out-of-Phase Operation
      7. 7.3.7  Output Overvoltage Protection (OVP)
      8. 7.3.8  PSM
      9. 7.3.9  Slope Compensation
      10. 7.3.10 Overcurrent Protection
        1. 7.3.10.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.10.2 Low-Side MOSFET Overcurrent Protection
      11. 7.3.11 Power Good
        1. 7.3.11.1 Adjustable Switching Frequency
      12. 7.3.12 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Serial Interface Description
      2. 7.4.2 I2C Update Sequence
    5. 7.5 Register Maps
      1. 7.5.1 VOUT2_SEL: Vout2 Voltage Selection Register (Address = 0x01H)
      2. 7.5.2 VOUT1_COM: Buck1 Command Register (offset = 0x03H)
      3. 7.5.3 VOUT2_COM: Buck2 Command Register (offset = 0x04H)
      4. 7.5.4 VOUT3_COM: Buck3 Command Register (offset = 0x05H)
      5. 7.5.5 SYS_STATUS: System Status Register (offset = 0x06H)
  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 Output Inductor Selection
        2. 8.2.2.2 Output Capacitor Selection
        3. 8.2.2.3 Input Capacitor Selection
        4. 8.2.2.4 Loop Compensation
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Receiving Notification of Documentation Updates
    2. 9.2 Support Resources
    3. 9.3 Trademarks
    4. 9.4 Electrostatic Discharge Caution
    5. 9.5 Glossary
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2.2 Output Capacitor Selection

The three primary considerations for selecting the value of the output capacitor are:

  • Output capacitor determines the modulator pole
  • Output voltage ripple
  • How the regulator responds to a large change in load current

The output capacitance must be selected based on the most stringent of these three criteria.

The desired response to a large change in the load current is the first criterion. The output capacitor needs to supply the load with current when the regulator cannot. This situation can occur if there are desired hold-up times for the regulator where the output capacitor must hold the output voltage above a certain level for a specified amount of time after the input power is removed. The regulator is also temporarily not able to supply sufficient output current if there is a large, fast increase in the current needs of the load such as a transition from no load to full load. The regulator usually needs two or more clock cycles for the control loop to see the change in load current and output voltage and adjust the duty cycle to react to the change. The output capacitor must be sized to supply the extra current to the load until the control loop responds to the load change. The output capacitance must be large enough to supply the difference in current for 2 clock cycles while only allowing a tolerable amount of droop in the output voltage. Equation 12 shows the minimum output capacitance necessary to accomplish this.

Equation 12. GUID-A0604FF8-F170-4351-BA0C-8C126CBD8462-low.gif

where

  • ΔIout is the change in output current
  • ƒsw is the regulators switching frequency
  • ΔVout is the allowable change in the output voltage

Equation 13 calculates the minimum output capacitance needed to meet the output voltage ripple specification.

Equation 13. GUID-DB04104D-6C89-4BFB-A40B-3E4CBDE0D910-low.gif

where

  • ƒsw is the switching frequency
  • Voripple is the maximum allowable output voltage ripple
  • Ioripple is the inductor ripple current

Equation 14 calculates the maximum ESR an output capacitor can have to meet the output voltage ripple specification.

Equation 14. GUID-13086ACD-0842-4A41-A6A5-B9198F4A925B-low.gif

Additional capacitance deratings for aging, temperature, and DC bias must be factored in, which increases this minimum value. Capacitors generally have limits to the amount of ripple current they can handle without failing or producing excess heat. The user must specify an output capacitor that can support the inductor ripple current. Some capacitor data sheets specify the root mean square (RMS) value of the maximum ripple current. Use Equation 15 to calculate the RMS ripple current the output capacitor needs to support.

Equation 15. GUID-7B75AA62-9CDC-448F-8853-557E97A3B708-low.gif