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TPS74801: TPS74801 usage

Izumi Maruyama
Intellectual 1350 points
Part Number: TPS74801

Hello support team,

 

I would like to know what voltage need to feed the BIAS terminal to be get good performance.

 

The requirement is:

VIN=3.3V, VOUT=2.5V, IOUT=1.5A

 

In case of VBIAS=5V, VBIAS-VOUT=2.5V then difference is more than 1.6V.

 

Also in case of VBIAS= 3.3V, VBIAS-VOUT=0.8V then difference is small.

 

Which one is expected operation. If needed I can feed 5V to the BIAS terminal.

 

Your answer would be very appreciated.

 

Best regards,

Izumi Maruyama

  • 0
    TI__Guru 55940 points

    Hi Izumi,

    In order to achieve a regulated output voltage, both the Vin dropout and Vbias dropout requirements must be met.

    We recommend that customers design to the maximum specifications; therefore, in order to achieve regulation with an output voltage of 2.5 V, we recommend that Vbias be at least 4.1 V (Vout + Vdo_bias = 2.5 V + 1.6 V = 4.1 V).

    Very Respectfully,

    Ryan