TPS51388: FB leak current

Hi Hitesh

I understand we can use 1Mohm for feedback resistors.

Hi Hitesh,

What is internal resistor of the FB pin? TPS51388 is adjustable Vout and there is no resistor in the block. My original question is what is leak current of FB pin.

Hello Koyo,

There is no such resistor on Feedback pin, I am pointing towards the input impedance on the FB pin due to the circuits connected internally to the FB pin (say comparators).

so the input impedance of the FB pin will be in some Mega ohms which will lead to a very low leakage current which will be in some uA, we don't have exact data for this.

can you tell me exactly what problem you are facing?

-Hitesh

Hi Hitesh

I understand the impedance of FB pin is Mohm order.

This is not a problem. Most DCDC have a IFB spec but TPS51388 doesn't have so I couldn't decide suitable divider values for customer.

Best regards
Koyo