TPS7A39: Parallel output

Chen Alex1

Expert 2855 points

Part Number: TPS7A39
Other Parts Discussed in Thread: TPS7A33

hi sir

that the TPS7A39 is a good device, but the current output is small

could I use the Twice Tpas7a39 to double the output current?

need +300mA

thanks

9 months ago

0 Stephen Ziel 9 months ago

TI__Mastermind 33885 points

Hi Chen,

Yes, you can parallel the TPS7A39 using the ballast resistor technique. We have white papers and a software tool which we released on this technique last year (copied below), however we will need to add the TPS7A39 to the calculator before you can use it. Would you be interested in using the TPS7A33 (1A capable) for the negative rail and another positive LDO for the positive rail? This may make your design easier and you won't have to parallel the LDO's. If you wish to pursue paralleling the TPS7A39, we can certainly help you with this design, just let me know.

Comprehensive Analysis and Universal Equations for Parallel LDO's Using Ballast Resistors
Parallel LDO Architecture Design Using Ballast Resistors

PARALLEL-LDO-CALC

Thanks,

Stephen

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TPS7A39: Parallel output