CC1310: Internal DC-DC Converter Information

Drew Bell

Part Number: CC1310

Hi all,

I'm working to certify a product containing a CC1310F128 for use in hazardous locations. For this, the certification agency needs to know more about the CC1310's internal DC-DC converter.

Essential question: What type of DC/DC regulator is the "On-Chip Internal DC/DC Converter" in the CC1310? Is it a switching buck converter? Any additional info on the converter appreciated.

Thanks,

Drew

Background:

To certify our product, we need to know if the CC1310's DC/DC converter is a "voltage-enhancing circuit", i.e. one that can increase the voltage in any scenario, with or without faults applied. If the internal DC/DC circuitry can in any situation allow the voltage can be increased, we will need to take extra steps in our PCB design to limit the voltage. If the internal DC/DC converter can only lower the voltage, then we don't need to take any addition safety measures.

So the deeper question can the CC1310's internal DC/DC converter enhance the voltage IN ANY SITUATION (any pin shorted to any pin), or can it only lower the voltage?

over 7 years ago

0 TER over 7 years ago

TI__Guru**** 317180 points

The DC-DC converter on CC1310 will only reduce the voltage.

The DC-DC works in parallel with the global LDO and the LDO will also always only reduce the voltage.

0 Drew Bell over 7 years ago in reply to TER

Prodigy 45 points

TER, thanks for the fast response! And that's good to hear.

To double check, are there ANY fault conditions where voltage could be enhanced?

And to help communicate with our certification agency, are there any design documents, test results, etc. that you can share that demonstrates that voltage an only be reduced? We are dealing with explosive atmospheres, so they (and we) need to be sure there will never be a problem under any circumstances.

0 TER over 7 years ago in reply to Drew Bell

TI__Guru**** 317180 points

The DC-DC is described in detail here: www.ti.com/.../swra494.pdf

I understand the question but how high voltages are needed to make an explosion in this case? As the app note shows the converter is designed to take down the voltage and it's therefore not able to increase the voltage. This will also damage the chip. We have no direct testing of over voltage but an over voltage would have been detected in other tests.

0 Drew Bell over 7 years ago in reply to TER

Prodigy 45 points

Thanks, this app note is very helpful. I'll take a deeper look at this myself and share it with our team. Thanks again!

Sub-1 GHz

Sub-1 GHz forum

CC1310: Internal DC-DC Converter Information