Running two TPS71712 in parallel

Gene Ricks

Prodigy 10 points

I'm using the TPS71712DCKR and the PCB is already laid out with two of them with the inputs and outputs shorted.

Before I take one off and fire up the board, will 2 work in parallel sharing the load?

over 12 years ago

0 Donald Jones over 12 years ago

TI__Mastermind 22610 points

"... will 2 work in parallel sharing the load?"

In general, when two (or more) LDO outputs are shorted together the load current is rarely (if ever) shared evenly. The LDO with the lowest highest output voltage, even if only by a few milli-volts, will deliver the bulk of the load current.

See: Ballast Resistors Allow Load Sharing Between Two Paralleled DC/DC Converters

http://www.ti.com/lit/an/slva250/slva250.pdf

Power management

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Running two TPS71712 in parallel