SLVSE31C January   2018  – July 2018 TPSM84209

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application
      2.      Efficiency vs Output Current
  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 Typical Characteristics (VIN = 5 V)
    7. 6.7 Typical Characteristics (VIN = 12 V)
    8. 6.8 Typical Characteristics (VIN = 24 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  Input Capacitor Selection
      3. 7.3.3  Undervoltage Lockout (UVLO)
      4. 7.3.4  Output Capacitor Selection
      5. 7.3.5  Feed-Forward Capacitor
      6. 7.3.6  Operating Range
      7. 7.3.7  Output Current Rating
      8. 7.3.8  Enable (EN)
      9. 7.3.9  Internal Soft Start
      10. 7.3.10 Safe Start-Up Into Prebiased Outputs
      11. 7.3.11 Light Load Efficiency / Eco-Mode
      12. 7.3.12 Voltage Dropout
      13. 7.3.13 Overcurrent Protection
      14. 7.3.14 Output Overvoltage Protection (OVP)
      15. 7.3.15 Thermal Performance
      16. 7.3.16 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Eco-Mode Operation
      3. 7.4.3 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 Input Capacitors
        4. 8.2.2.4 Output Capacitors
        5. 8.2.2.5 Enable Control
      3. 8.2.3 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 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

7.3.4 Output Capacitor Selection

The minimum amount of required output capacitance for the TPSM84209 varies depending on the output voltage and whether or not a feed-forward capacitor, CFF, is used (see Feed-Forward Capacitor for more information on CFF). Table 4 lists the minimum output capacitance for several output voltage ranges when not using CFF. The required output capacitance must be comprised of all ceramic capacitors or a combination of ceramic and polymer-type capacitors. The effects of temperature and capacitor voltage rating must be considered when selecting capacitors to meet the minimum required capacitance.

When adding additional output capacitance, ceramic capacitors or a combination of ceramic and polymer-type capacitors can be used. The required capacitance above the minimum is determined by actual transient deviation requirements. See Table 5 for a preferred list of output capacitors by vendor.

Table 4. Minimum Required Output Capacitance

VOUT RANGE (V) Minimum Required COUT
MIN MAX
1.2 < 1.5 188 µF (4 x 47 µF ceramic)(1)
1.5 < 2.5 141 µF (3 x 47 µF ceramic)(1)
2.5 < 5 94 µF (2 x 47 µF ceramic)
5 6 47 µF (1 x 47 µF ceramic)
(1) The minimum required output capacitance can also be made up of 1 x 47 µF ceramic + 1 x 100 µF polymer-type capacitor.

Table 5. Recommended Output Capacitors(1)

VENDOR SERIES PART NUMBER CAPACITOR CHARACTERISTICS
WORKING VOLTAGE (V) CAPACITANCE(1)
(µF)		 ESR(2)
(mΩ)
TDK X5R C3225X5R1C106K 16 10 2
Murata X5R GRM32ER61C106K 16 10 2
TDK X5R C3225X5R1C226M 16 22 2
Murata X5R GRM32ER61C226K 16 22 2
TDK X5R C3225X5R1A476M 10 47 2
Murata X5R GRM32ER61C476K 16 47 3
TDK X5R C3225X5R0J107M 6.3 100 2
Murata X5R GRM32ER60J107M 6.3 100 2
Murata X5R GRM32ER61A107M 10 100 2
Kemet X5R C1210C107M4PAC7800 16 100 2
Panasonic POSCAP 6TPE100MI 6.3 100 18
Panasonic POSCAP 6TPF220M9L 6.3 220 9
Panasonic POSCAP 6TPE220ML 6.3 220 12
(1) Specified capacitance values.