SLVA477C December   2011  – September 2026 TLV62080 , TLV62085 , TLV62090 , TLV62130 , TLV62130A , TLV62150 , TLV62150A , TPS62000 , TPS62000-HT , TPS62002 , TPS62003 , TPS62004 , TPS62005 , TPS62006 , TPS62007 , TPS62008 , TPS62020 , TPS62021 , TPS62026 , TPS62040 , TPS62042 , TPS62043 , TPS62044 , TPS62046 , TPS62050 , TPS62051 , TPS62052 , TPS62054 , TPS62056 , TPS62060 , TPS62061 , TPS62063 , TPS62065 , TPS62067 , TPS62080 , TPS62080A , TPS62081 , TPS62082 , TPS62085 , TPS62086 , TPS62087 , TPS62088 , TPS62090 , TPS62090-Q1 , TPS62091 , TPS62092 , TPS62093 , TPS62097 , TPS62097-Q1 , TPS62100 , TPS62101 , TPS62102 , TPS62103 , TPS62110 , TPS62110-EP , TPS62110-HT , TPS62110-Q1 , TPS62111 , TPS62111-EP , TPS62112 , TPS62112-EP , TPS62113 , TPS62120 , TPS62122 , TPS62125 , TPS62130 , TPS62130A , TPS62131 , TPS62132 , TPS62133 , TPS62135 , TPS62136 , TPS62140 , TPS62140A , TPS62141 , TPS62142 , TPS62143 , TPS62150 , TPS62150A , TPS62151 , TPS62152 , TPS62153 , TPS62160 , TPS62161 , TPS62162 , TPS62163 , TPS62170 , TPS62171 , TPS62172 , TPS62173 , TPS62175 , TPS62177 , TPS62180 , TPS62200 , TPS62201 , TPS62202 , TPS62203 , TPS62204 , TPS62205 , TPS62207 , TPS62208 , TPS62220 , TPS62221 , TPS62222 , TPS62223 , TPS62224 , TPS62225 , TPS62227 , TPS62228 , TPS62230 , TPS62231-Q1 , TPS622314-Q1 , TPS62240 , TPS62242 , TPS62242-Q1 , TPS62243 , TPS62250 , TPS62260 , TPS62260-Q1 , TPS62261 , TPS62261-Q1 , TPS62262 , TPS62262-Q1 , TPS62263 , TPS62263-Q1 , TPS62270 , TPS62272 , TPS62273 , TPS62290 , TPS62290-Q1 , TPS62291 , TPS62293 , TPS62293-Q1 , TPS62300 , TPS62301 , TPS62302 , TPS62303 , TPS62304 , TPS62305 , TPS62320 , TPS62321 , TPS62350 , TPS62352 , TPS62353 , TPS62354 , TPS62355 , TPS62356 , TPS62360 , TPS62361B , TPS62362 , TPS62363 , TPS62366A , TPS62366B , TPS62400 , TPS62400-Q1 , TPS62401 , TPS62402 , TPS62402-Q1 , TPS62403 , TPS62404 , TPS62404-Q1 , TPS62406-Q1 , TPS62407-Q1 , TPS62410 , TPS62410-Q1 , TPS62420 , TPS62420-Q1 , TPS62421 , TPS62422-Q1 , TPS62423-Q1 , TPS62424-Q1 , TPS62510 , TPS62560 , TPS62561 , TPS62562 , TPS62590 , TPS62590-Q1 , TPS62601 , TPS62612 , TPS62615 , TPS62616 , TPS62619 , TPS62620 , TPS62621 , TPS62622 , TPS62623 , TPS62624 , TPS62625 , TPS62650 , TPS62650-Q1 , TPS62651 , TPS62660 , TPS62665 , TPS62671 , TPS62672 , TPS62674 , TPS62675 , TPS62679 , TPS62690 , TPS62693 , TPS62700 , TPS62730 , TPS62732 , TPS62733 , TPS62740 , TPS62750 , TPS62751 , TPS62800 , TPS62801 , TPS62802 , TPS62806 , TPS62807 , TPS62808 , TPS62821 , TPS62822 , TPS62823 , TPS62825 , TPS62826 , TPS62840 , TPS62870 , TPS62870-Q1 , TPS62871 , TPS62871-Q1 , TPS62872 , TPS62872-Q1 , TPS62873 , TPS62873-Q1 , TPS62874-Q1 , TPS62875-Q1 , TPS62876-Q1 , TPS62877-Q1 , TPS65000 , TPS65001 , TPS65010 , TPS65011 , TPS65012 , TPS65013 , TPS65014 , TPS65020 , TPS65021 , TPS65022 , TPS65023 , TPS650231 , TPS65050 , TPS65055 , TPS65070 , TPS65072 , TPS65073 , TPS650830 , TPS65086 , TPS65090 , TPS65137 , TPS65160 , TPS65160A , TPS65161 , TPS65161A , TPS65161B , TPS65162 , TPS65163 , TPS65167A , TPS65175 , TPS65175B , TPS65175C , TPS65177 , TPS65177A , TPS65180B , TPS65181B , TPS65182B , TPS65217 , TPS65218 , TPS65218D0 , TPS65640 , TPS65642 , TPS65642A , TPS65720 , TPS65721 , TPS65910 , TPS65911 , TPS65912 , TPSM8287A06 , TPSM8287A10 , TPSM8287A12 , TPSM8287A15 , TPSM8287B15 , TPSM8287B30

 

  1.   1
  2.   Abstract
  3. 1Basic Configuration of a Buck Converter
    1. 1.1 Necessary Parameters of the Power Stage
  4. 2Calculate the Maximum Switch Current
  5. 3Inductor Selection
  6. 4Rectifier Diode Selection
  7. 5Output Voltage Setting
  8. 6Input Capacitor Selection
  9. 7Output Capacitor Selection
  10. 8References
  11. 9Revision History
  12.   A Formulas to Calculate the Power State of a Buck Converter

6 Input Capacitor Selection

The minimum value for the input capacitor is normally given in the data sheet. This minimum value is necessary to stabilize the input voltage due to the peak current requirement of a switching power supply. The best practice is to use low-equivalent series resistance (ESR) ceramic capacitors. The dielectric material must be X5R or better. Otherwise, the capacitor loses much of its capacitance due to dc bias or temperature.

The value can be increased if the input voltage is noisy.