LMR14203: Power sequence

dinesh gupta

Intellectual 310 points

Part Number: LMR14203
Other Parts Discussed in Thread: DAC8718,

We are using this regulator for "DAC8718", for this DAC we need to do power on sequencing.

As of now we are applying all powers together. We need a way to delay 15V supply which is generating from "LMR14203"

Please suggest

Thanks,

DInesh

over 4 years ago

0 Marshall_Beck over 4 years ago

TI__Mastermind 35040 points

Internal soft-start is fixed for this device and EN high to switching time is fixed.

Nothing can be done at IC level. RC delay and schmitt trigger can be added on EN, but that may cause issues for mass production variance as big capacitors may be required which will exhibit +/- 20% tolerance.

Some devices come with programmable soft start, or they can be changed at system level.

http://www.ti.com/lit/an/slyt669/slyt669.pdf

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LMR14203: Power sequence