Current spikes in low power modes

RE: Current spikes in low power modes

Priyanka — Wed, 25 Jan 2023 15:17:51 GMT

Hi,

What happens in the refresh mode is that, the regulator charges the capacitor at DEC4:

and when it is fully charged, the regulator turns off. Then the charge in this capacitor is used by the chip and when the voltage goes below a certain level, the regulator is turned on and charges the capacitor again.

So there is no voltage boost. The DCDC regulator is just a voltage buck regulator.

Best Regrds,

Priyanka

RE: Current spikes in low power modes

Nordix — Tue, 24 Jan 2023 13:24:47 GMT

Hi,
maybe "charge pump" was not the right term.
I would assume that it connects the supply input to some internal capacitors and adjusts the switching frequency to maintain a certain internal voltage in a range around the 1.3V core voltage.

I would be grateful if you have more information about this.

Best regards

RE: Current spikes in low power modes

Priyanka — Tue, 24 Jan 2023 12:42:08 GMT

Hi,

It does not seem to be like a charge pump. Just that the capacitors are not connected when not required, to the voltage source. We do not seem to have a particular documentation, but I will check internally and get back to you.

Best Regards,

Priyanka