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TPS74801: TPS74801 application for Vbias

Part Number: TPS74801

Hi Expert,

I have a request of TPS74801 application need you help to double check.

Customer spec, Vin= Vbias=3.3V, Vout = 1.8V and Iout=0.06A.

From datasheet recommend the Vbias need large than Vout+1.6V, and test condition at 1.5A output.

But check the customer spec, the output current only 0.06A.

So do you have any concern to the customer design? do you approve this design under very light load condition?

Due to customer will tape out tomorrow, so please help to feedback ASAP.

Regards,

Mark

  • Hi Mark,

    I am curious as to why they are using a 1.5A regulator for a 60mA load. 

    The datasheet also shows the following:

    This shows with 1.5V drop at 500mA your drop-out voltage is ~75mV at 125C. While these are typical and not worst-case curves, at a 60mA load, I suspect that they are OK. 

    We have many LDO's that can easily do this, I would like to hear why they want to use this one.