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

A Formulas to Calculate the Power State of a Buck Converter

Equation 15. TLV62080

VIN(max) = maximum input voltage
VOUT = output voltage
η = efficiency of the converter, e.g., estimated 85%

Equation 16. TLV62080

VIN(max) = maximum input voltage
VOUT = desired output voltage
D = duty cycle calculated in Equation 15
fS = minimum switching frequency of the converter
L = selected inductor value

Equation 17. TLV62080

ILIM(min) = minimum value of the current limit of the integrated switch (given in the data sheet)
ΔIL = inductor ripple current calculated in Equation 16

Equation 18. TLV62080

ΔIL = inductor ripple current calculated in Equation 16
IOUT(max) = maximum output current necessary in the application

Equation 19. TLV62080

VIN = typical input voltage
VOUT = desired output voltage
fS = minimum switching frequency of the converter
ΔIL= estimated inductor ripple current, see next paragraph

Equation 20. TLV62080

ΔIL = estimated inductor ripple current
IOUT(max) = maximum output current necessary in the application

Equation 21. TLV62080

IOUT(max) = maximum output current necessary in the application
D = duty cycle calculated in Equation 1

Equation 22. TLV62080

IF = average forward current of the rectifier diode
VF = forward voltage of the rectifier diode
D = duty cycle calculated in Equation 1

Equation 23. TLV62080

IFB = feedback bias current from data sheet

Equation 24. TLV62080
Equation 25. TLV62080

VFB = feedback voltage from the data sheet
IR1/2 = current through the resistive divider to GND, calculated in Equation 23
VOUT = desired output voltage

Equation 26. TLV62080

ΔIL = estimated inductor ripple current
fS = minimum switching frequency of the converter
ΔVOUT = desired output voltage ripple

Equation 27. TLV62080

ESR = equivalent series resistance of the used output capacitor
IOUT(max) = maximum output current of the application
ΔIL = inductor ripple current from Equation 16 or Equation 20

Equation 28. TLV62080

ΔIOUT = maximum output current change in the application
Vout = desired output voltage
VOS = desired output voltage change due to the overshoot