TPS63031: TPS63031

pb ben

Part Number: TPS63031

Hi,

for a new wearable device, we must have a minimum power consumption, for this reason what is the maximun resistance we can put to keep the TPS63031 disabled? Can I use more than 1 megaohm?

Thanks.

over 4 years ago

0 Tao Zhang over 4 years ago

TI__Mastermind 30630 points

Hi ben,

If you want disable TPS63031, Ven should be smaller than 0.4V when input voltage is highest;

You can calculate the Ven as follow: Ven=(Vin-Vdiode)*R31/(R31+R3). The voltage drop of diode is almost 0.3 in this APP.

thanks for your coming and hope my reply is useful

0 pb ben over 4 years ago in reply to Tao Zhang

Prodigy 210 points

Thaks for the answer.

My problem is knowing when no signal is coming from the two diodes, if R31 with 2Mohm is ok to keep the EN pin low and the power supply off or this resistance is too high and the EN pin may be in an unstable situation ...

0 Tao Zhang over 3 years ago in reply to pb ben

TI__Mastermind 30630 points

hi ben

it will be ok with R31=2Mohm, be careful with the high frequency noise coming from PCB

BTW, if there is no signal from diodes, input voltage will be always below UVLO which is 1.6V minimum?

0 pb ben over 3 years ago in reply to Tao Zhang

Prodigy 210 points

Hi, thanks for the reply.
When the VIN of TPS63031 come from battery and is below 3V, the out of comparator go low, then we have VIN of TPS63031 from 2,5V to 3V and the pin EN pull-down with 1 or 2 Mohm...

+1 Tao Zhang over 3 years ago in reply to pb ben

TI__Mastermind 30630 points

HI ben

thanks for your explain and hope your project goes well; see you next time.

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TPS63031: TPS63031