SNVAA16 May   2021 TPS548A28 , TPS548A29 , TPS548B28 , TPS54JA20 , TPS54JB20

 

  1.   Trademarks
  2. 1DC/DC Converters with Internal LDO
  3. 2DC/DC Converters with External Bias
  4. 3Efficiency and Power Loss Calculations
  5. 4Power Loss of Multi-Rail Point-of-Load System
  6. 5Summary

5 Summary

DC/DC converters with split-bias rail capability considerably reduce power losses when an external 5-V supply is readily available on the circuit board. Efficiency is increased by eliminating internal LDO losses and reducing RDS(on) conduction losses with a higher gate-drive voltage, especially at higher output current levels. The improvements are multiplied by the number of DC/DC converters on the circuit board.