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LM76003: Maximum Drop-out Voltage

Part Number: LM76003

Hi team,

Could you please help provide (or make reasonable estimation) of maximum dropout voltage under below conditions: 

  • Vout = 4V
  • Iout = 3A
  • Fsw = 500kHz

  • Hi Yu:

    for dropout voltage, it can be used as below formula:

    Vo=Vin*Dmax-Rds_HS*Io*Dmax-Rds_LS*Io*(1-Dmax)-Rdc_Ind*Io

    Io : load current

    Rds_HS: high side rdson

    Rds_LS: low side rdson

    Rds_Ind: Rdson of inductor

    Dmax: Max duty , for LM76003 is 98.9% as typical max duty

    Thanks