LP55231: Enable Pin Pull-Up

David Kearney

Part Number: LP55231

Hi Guys, quick question - does the LP55231 enable line have an internal pull-up? If I leave it floating will the IC power on OK? Or do I need to pull it to Vcc?

Thanks,

Dave

over 6 years ago

0 ivan yakimenko over 6 years ago

Prodigy 80 points

seems no, coarse chip go to start after power up

0 David Kearney over 6 years ago in reply to ivan yakimenko

Intellectual 590 points

Thanks, could you be a bit more specific? Do I need an external pull-up? Cheers, Dave

0 Summer SU over 6 years ago in reply to David Kearney

TI__Expert 4445 points

Hi David,

The pull-up is necessary for the device EN pin, thanks!

Summer

0 David Kearney over 6 years ago in reply to Summer SU

Intellectual 590 points

Thanks Summer. One quick follow-up Q: Is it possible to turn off the Charge Pump and just run the driver in normal 1x mode? i.e. to reduce noise caused by the 1.25 MHz Charge Pump switching?

Thanks,

Dave

0 Summer SU over 6 years ago in reply to David Kearney

TI__Expert 4445 points

Hi David,

Surely, you can use it as this way.

Thanks!

Summer

Power management

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LP55231: Enable Pin Pull-Up