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DC/DC current consumption

Kveso

Good morning Nordic team,

I was measuring the nRF52832 chip in DC/DC mode. Everything went just as expected. Now I was looking at the current consumption when the radio is off and it resulted in just 3 µA. But while I was reading in the DevZone I saw a post, where it was said that the constant current consumption of a DC/DC regulator is at 300 µA. Now I am wondering what value is correct? Or is it possible, that the chip turned into LDO when going to sleep? I was measuring with the power profiling app (S132). Thanks in advance and best regards

  • 0

    Yes, that sounds like a reasonable current consumption value. If you take a look in the nRF52832 Product Specification, Section 17.1.1, under Current Consumption Scenarios you'll see the following

    ION_RAMOFF_RTC System ON, No RAM retention, Wake on RTC 1.9 μA

    Note: The values are typical(i.e.nominal) and deviations due to process variations are to be expected.

    The nRF52832 will automatically switch between LDO and DC/DC regulator based on load to maximize efficiency. In addition both the LDO and DCDC have two modes of operation. Normal mode and refresh mode. Refresh mode is used when the current consumption is low in order to further maximize the efficiency. Refresh mode works by charging up internal caps regularly to provide power to the chip.

    Best regards

    Bjørn

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