LDO current consumption, low voltage mode.

[cocoa]

Hi Nordic guys,

How much is the current consumption of the LDO only (quiescent current), without DC / DC converter, in uA? How much is dropout voltage and PSRR (ripple rejection) ?

When powering nRF51822 in low power mode, LDO has a quiescent current or is true disconnected?

What are the advantages and disadvantages when powering nRF51822 in low voltage mode ?

How much is leakage current of a gpio pin when enabled as output and as input ?

Thanks.

-c

[Håkon Alseth]

Hi Cocoa,

I am afraid that I cannot give you the PSRR, as we do not have numbers on this.

There are more than just one regulator inside the nRF51. You have one for analog, one for digital, and the radio has several more. All of these are with different characteristics in terms of the requirement for the peripherals or hw blocks that it supplies. Most of these regulators cannot be accessed directly on a pin.

Also, the PSRR changes wrt. frequency.

Best regards Håkon

[cocoa]

Thanks Håkon, other way : using a 3V3 supply, how is the max allowed ripple ?

Bye,

-c

[Håkon Alseth]

Hi Cocoa,

We recommend that you keep the ripple under 100 mVpp.

BR, Håkon

[cocoa]

Ok, this is better then 10mVpp with 1V8 supply.

Thank you.

BR, -c