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TPS62480: TPS62480 comparaison with N-MOS High-Drive Buck

Alex Missler
Prodigy 40 points
Part Number: TPS62480
Other Parts Discussed in Thread: TPS62867

Hi,

I want to evaluate a dual phase Buck Converter done with TPS62480 against a Discrete N-MOS H-D Buck.

The Design of the Discrete Buck is the following : 

Vin = 3.7V, 

PWM = 0-3.3V, 100kHz, duty-cycle ~0.5

The design has been done by a fellow engineer so I don't fully understand it. Especially the use of a NMOS for the High-Drive side and the supposedly "bootstrap" to drive it. 

From my calculation, the inductor seems to be too low, causing current ripples of about 0.9 A. Can someone confirm if this circuit can perform as a Buck ? 

  • 0
    TI__Guru*** 148160 points

    Hi Alex,

    It's not clear what you need.  I suggest talking to whoever drew that circuit to understand the purpose of it.

    Instead of the older TPS62480, we have single phase devices that offer higher efficiency and smaller size, such as TPS62867.

    Thanks,

    Chris