LP38798: Okay to Parallel? Otherwise, component recommendation

Go Bravos

Expert 6090 points

Part Number: LP38798
Other Parts Discussed in Thread: TPS7A4001

Team,

I need 1.2A 15V LDO with as much PSRR as possible to 2Mhz. Can I parallel the LP38798?

If so, please provide app note(s).

If you'd recommend against it, then please advise a better fit part given the design requirements.

Thank you.

over 4 years ago

0 Go Bravos over 4 years ago

TI__Expert 6090 points

TPS7A4001 or TPS7A4701 would also work if they can be paralleled, perhaps a sense resistor approach?

0 Ryan Eslinger over 4 years ago

TI__Guru 55940 points

Hi ,

While it should be possible to apply techniques to parallel LP38798, it is important to note that in order to increase PSRR you would want to place the regulators in series. Paralleling would reduce the self-generated noise but not the regulators ability to block input ripple.

The following TI Designs provide examples of parallel techniques:

http://www.ti.com/lit/ug/tiducs7/tiducs7.pdf

http://www.ti.com/lit/ug/tidu421/tidu421.pdf

Very Respectfully,

Ryan

Power management

Power management forum

LP38798: Okay to Parallel? Otherwise, component recommendation