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TPS54290: Duty cycle Consideration

VenkataNarasimha Naru
Prodigy 130 points
Part Number: TPS54290

Hi,

We are planning to use TPS54290 in one of projects, it is dual output switching step down regulator and we would like generate 3.7V and 1.8V from 4.5V input using this regulator, just want check with you before proceeding further on design, would this regulator is capable to generate 3.7V@1A from 4.5V input. from the datasheet this device supports max duty cycle is 96% and we are presuming this regulator can generate 3.7V from 4.5V. can you please confirm on this.

Regards,

venkat

  • 0
    TI__Guru**** 191445 points
    Actually, it is the minimum maximum duty cycle of 90 % that should concern you. Nominal duty cycle for your design is 82.2 % but with FET losses it will be higher. I would recommend that you use the higher current (lower RDSon) CH2 for your 3.7 V output. Duty cycle at 1 A load should be about 86%