Tool/software:
Dear TI Support Team,
I am writing to inquire about the power supply options for the TMS320F28P650DK9 microcontroller.
As I understand, this device includes an internal 1.2V regulator, which allows operation by supplying only an external 3.3V VDDIO and grounding the VREGENZ pin. This is a very useful feature for reducing PCB footprint.
However, according to the device’s datasheet, it appears that the overall power consumption is higher when using the internal 1.2V regulator compared to supplying an external 1.2V source. Consequently, I would expect the overall heat dissipation of the device to be higher when relying on the internal regulator.
With this in mind, I would like to ask the following questions:
1. Can the device reliably operate across the full datasheet-specified free-air temperature range (-40°C to +125°C) when only the external 3.3V VDDIO is provided and the internal 1.2V regulator is enabled?
2. Since enabling the internal 1.2V regulator seems to increase total power consumption and heat dissipation, this could be a disadvantage in high-temperature environments (e.g., above 100°C). Are there any documented specifications or application notes that detail the power/thermal dissipation characteristics of the device under both configurations (using the internal regulator vs. an external supply)?
3. What is TI’s recommended power supply design approach for this device (using the internal regulator vs. an external 1.2V supply)?
Thank you very much for your assistance.
Best regards,
Sangil Nam
