RE: Using REG0 as LDO and REG1 as DCDC

Jared — Thu, 18 Jul 2019 12:48:41 GMT

Hi,

The product specification only gives examples of different combination not necessarily every possible one. I would generally recommend using DC/DC at both REG0 and REG1 as it more effective then LDO. The drawback of using DC/DC is that it requires an external filter which might not be manageable if you're restricted in area.

[quote user=""]The supply of VDDH is around 2.5V.[/quote]

Is there a specific reason that you use High Voltage Mode instead of Normal mode? A supply of 2.5 V is within the range of Normal mode.

[quote user=""][/quote]

Could it be that the errata 197 has an impact event if we do not use the DCDC0?

The errata should only be related to DCDC on REG0. Are you observing any of the symptoms of the errata?

regards

Jared

RE: Using REG0 as LDO and REG1 as DCDC

lemi — Thu, 18 Jul 2019 12:10:14 GMT

To add some information: This is measured over a 10Ohm resistor, current going into VDDH. VDD has some capacity of course, but no further external peripherial (and there is no ripple which could inidcate some load there).

The software is a simple WFE loop.

int main(void)
{
 
 
    __disable_irq();
    initializeGPIO();
    for (;;) {
        __disable_irq();
        __WFE();
    }
}