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TPS54560B: Can TPS54560B replace LTC3864?

Rock Shao
Expert 2995 points
Part Number: TPS54560B
Other Parts Discussed in Thread: LM5085, TPS54560

Hi,

Can TPS54560B replace LTC3864?

Based on LTC3864 with 100% Duty Cycle Capability, I check the TPS54560B SPEC as the below,

It means TPS54560B also can work in Vin=Vout, and the output voltage will be stable?

Because our customer has a LAN by-pass circuit detects the output, so the output cannot drop voltage.ThanksLTC3864.pdf

Regards

Rock

  • 0
    TI__Mastermind 27470 points

    HI

    LTC3864 is a pfet controller, if you really need 100% duty, you can use LM5085.

    for TPS54560, if you an add a 5V at Boot to SW, it can work at 100%, otherwise, it will close to 100%, but when boot to SW voltage lower than its UVLO point, it will force the internal small low side fet on to charge the boot cap

    Thanks