High Current in IDLE

[Hermano Guimaraes]

Hello.

We are implementing npm1100 in our project. I'm measuring about 4mA without any load connected.

Please see circuit below:

Did I made anything wrong?

Thanks.

[Hermano Guimaraes]

Hi

If I use Hysteretic Mode my radio performance will be affected?
How is the consumption for this mode?

[JONATHAN LL]

Hermano Guimaraes said:

Hysteretic Mode my radio performance will be affected?

It should not be. 

Hysteretic modes for low load currents(90mA/40mA), but it is not possible to lock the device to use only Hysteretic mode. It will automatically switch to PWM if load currents demand it. 

You can see the data shown here: https://infocenter.nordicsemi.com/topic/ps_npm1100/chapters/core_components/buck/doc/frontpage.html?cp=7_0_0_5_2_4#elec_chara 

Regards,
Jonathan

[Hermano Guimaraes]

Hi Jonathan,

My circuit drain 780uA so I changed the configuration to Hysteretic mode and didin't affect my radio performance. The voltage looks clean in the oscilloscope even switching the strain gauges.

In this mode the npm1100 is draining 900nA without load, very close to the datasheet. Now is working fine for me in terms or current consumption.

The only issue that I'm having right now is the PCB layout, I have such small space to work, but that is another topic.

Thanks,

Hermano