nPM1100 - driving VCC from external supplyhttps://devzone.nordicsemi.com/f/nordic-q-a/92846/npm1100---driving-vcc-from-external-supplyWhat is the behavior if back-feeding the nPM1100&#39;s VCC output, such as if VCC is supplied from a external supply and no battery or USB power is present. I have been bringing up a new board on a bench setup where I powered the board&#39;s VCC from an externalen-USTelligent Community 13Fri, 14 Oct 2022 10:29:40 GMTRE: nPM1100 - driving VCC from external supplyhttps://devzone.nordicsemi.com/thread/390780?ContentTypeID=1Fri, 14 Oct 2022 10:29:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ee1efc8a-bfe6-491d-a2bd-6eda2f5436beketiljo<p>It&#39;s not possible to back-feed the nPM1100 without breaking the absolute maximum ratings:</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1665743240727v1.png" alt=" " /></p> <p>VINT is provided by VBAT or VBUS so when both are off, the output must be low as well. What happens internally is that the ESD protection diodes from VOUT to VBAT and VBUS will start to conduct. Eventually, too much current here will kill the device.&nbsp;</p><div style="clear:both;"></div>