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Original question:

TPS720-Q1: VBIAS always has to be greater than Vout by 1.4V even if a novel feature is not required where the output of the...

TPS720-Q1: Max VBIAS current

Kazuhiko Hirano
Genius 13088 points
Part Number: TPS720-Q1

Hello,

 

My customer is using TPS72029 as follows.

Vin =3.3V

Vout = 2.9V

Iout(max) = 100mA.

They also plan to put 5V for VBIAS pin and plan to get the 5V from 12V using a shunt regulator.

But, in order to that, they would like to know maximum VBIAS current to design the shunt regulator.

Could you tell my customer the maximum VBIAS current in their use case, please?

 

Best regards,

 

K.Hirano

  • 0
    TI__Mastermind 23361 points

    Hi Hirano-san, 

    The VBIAS rail only draws a very low current ( on the order of the quiescent current of the LDO). Unfortunately, we do not have a specification on the max for this current. For this device, the quiescent current is 38uA typically. I would suggest setting the shunt regulator to at least provide 100uA or higher current. 

    Regards, 
    Jason Song