TPS65023 unused LDOs, DEFLDOx termination

Binupandian S

Hi,

We are using TPS60523B in our design.

Both LDO1 and LDO2 remain unused. From datasheet,

If both LDOs are not used,
the input supply pin as well as the output pins of the LDOs (VINLDO, VLDO1, VLDO2) should be tied to GND.

What about the DEFLDOx pins?

Can I assume that DEFLDOx also needs to be tied directly to GND like the other pins?

Thanks & Regards,

Binupandian S

over 10 years ago

0 Emrys Maier over 10 years ago

TI__Guru* 97046 points

Moving to PMU forum for best support.

0 Binupandian S over 10 years ago in reply to Emrys Maier

Prodigy 180 points

Also, in general, is it recommended to tie DEFDCDCx and DEFLDOx pins directly to VCC/GND or is it better to use a resistor (say ~10K) to connect to GND?

Thanks and Regards,

Binupandian S

0 Michael Green over 10 years ago in reply to Binupandian S

TI__Genius 16870 points

You can tie the DEFLDOs and DEFDCDCs to GND. No need for a resistor unless you plan on possibly needing them later on. If you might need them later then you should also have the spots for the output filters and caps.

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TPS65023 unused LDOs, DEFLDOx termination