DC/DC higher consumption than LDO

RE: DC/DC higher consumption than LDO

silvio3105 — Tue, 25 Mar 2025 10:53:40 GMT

3V.

I will try with DK soon.
This is schematic for custom board.

RE: DC/DC higher consumption than LDO

Simonr — Tue, 25 Mar 2025 08:37:14 GMT

What voltage are you supplying the device with here? Do you have an nRF52832 DK where you can reproduce this as well, as just enabling DCDC shouldn't increase the current consumption this much.

You can export and upload the full .ppk file so we can review it on our side as well to see the power consumption looks okay or not.

Best regards,

Simon

RE: DC/DC higher consumption than LDO

silvio3105 — Mon, 24 Mar 2025 10:03:41 GMT

ILPS22QS sensor is not inited I guess. Device has few components - Sensor and MCU.
Consumption is measured with PPK2 and device is connected with VDD and GND(power is provided by PPK2).

I'm not curious with ~170uA sleep. I'm curious for ~223uA difference between LDO and DC/DC while in sleep. I expected to have better consumption in sleep with DC/DC.

RE: DC/DC higher consumption than LDO

Simonr — Mon, 24 Mar 2025 09:45:15 GMT

Noted, but the current consumption here looks a too high in sleep mode for both the LDO and DCDC, so I would like to know how exactly you measure current consumption on your end? How is the Power Profiler kit connected to the board, and what voltage are you supplying here? The power profiler traces seem very noisy, so it could be some issues with the setup as well. You can export and upload the full .ppk file so we can review it on our side as well to see the power consumption looks okay or not.

Best regards,

Simon

RE: DC/DC higher consumption than LDO

silvio3105 — Fri, 21 Mar 2025 11:59:44 GMT

Yes, but I'm looking at difference between DCDC sleep and LDO.

I'm using okd SDK, 17.1.0.

DCDC is enabled with register write and later(before and after sleep) SD function controls DCDC.

I'm not sure how I could force DCDC to be on all the time.

RE: DC/DC higher consumption than LDO

Simonr — Fri, 21 Mar 2025 11:51:32 GMT

What SDK version are you using here on your end? Enabling the DCDC register should let the SoC internally switch between using the DCDC and LDO depending on which is more power efficient, but if you're forcing the DCDC regulator to be on somehow, then it will consume more power than the LDO when the voltage is low during some operations (like when asleep). But by default, the nRF52832 should switch between using what's more efficient with the DCDC bit enabled.

In general, multiple hundred µAs is pretty high in a sleep mode, so is there something else on your board drawing current as well?

Best regards,

Simon