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TPS84259: Is it feasible to generate -12V from a 12V supply?

Gabriele Marocco8
Prodigy 240 points
Part Number: TPS84259
Other Parts Discussed in Thread: LMZM33606, LMZM33603

Is it feasible to generate -12V from a 12V supply with TPS84259?

From the first graph shown in the datasheet I guess that it is possbile and that in this condition the output current is limited to 0.7-0.8A. Is it correct?

  • 0
    TI__Guru 50120 points

    Hi Gabriele,

    What is your application (VIN,VOUT,IOUT)? It is correct that the "Safe Operating Current" graph provides the recommended maximum input voltage and load current operation of the part. For 12V -> -12V application the maximum load current will be roughly 0.75A. If you want more load current, you might want to look into configuring a buck module into an inverting buck using the LMZM33603 or even LMZM33606 both of which have their own respective app notes SNVA800 and SNVA835.

    Regards,

    Jimmy