https://devzone.nordicsemi.com/f/nordic-q-a/109842/npm1100-vbat-propertiesHello Team, We are working on the portable handheld Device. We are using nPM1100 for the Li-Ion Battery Charging and Buck Regulator for the MCU. We having some queries on that, so please help me out of it... 1. VBAT has internal Battery Reverseen-USTelligent Community 13Fri, 12 Apr 2024 12:53:31 GMThttps://devzone.nordicsemi.com/thread/478556?ContentTypeID=1Fri, 12 Apr 2024 12:53:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b2c1e1d0-d514-4725-a88d-988929b303fchelsing<p>Hi Nisanth, sorry for the delay.</p> [quote user=""]2. Giving 5V to VBUS and VBAT will be disconnected from the battery and VBAT pin is connected to input of 3.3V LDO.[/quote] <p>Sorry, this is not clear to me. Do you intend to disconnect the battery when connectec to VBUS? Would you be able to provide a more detailed description or some schematics? </p> [quote user=""]Is the nPM1100 finds there is no battery and will stop giving power to the VBAT or it will be giving the Power to VBAT pin so 3.3V LDO will getting the Power?[/quote] <p>As according to <a href="https://infocenter.nordicsemi.com/topic/ps_npm1100/chapters/application/doc/frontpage.html?cp=7_0_0_6_1#supply_buck">7.2 Supplying from Buck</a> in the Product Specification:</p> <blockquote> <p>An application should not be supplied directly from VBAT because it can disturb the battery charging<br />process and may cause incorrect behavior from the charger. Instead, VOUTB and/or VSYS should be used<br />to supply an application.</p> </blockquote><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/476604?ContentTypeID=1Tue, 02 Apr 2024 13:21:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e91d6ee7-4421-4b30-991e-08f387eea6afhelsing<p>Hi Nishanth,</p> [quote user=""]1. VBAT has internal Battery Reverse Polarity protection?[/quote] <p>This is not supported. VBAT min. is -0.3V. </p> <p>I will get back to you on the second question.</p> <p>Best regards, <br />Håkon</p><div style="clear:both;"></div>