My goal is to understand a load sharing system I found on the internet. Reading about MOSFETs the last couple of days did not fully lead to my understanding. As seen on the screenshot of Schematic 1, I want to have a load sharing system. If no USB C is connected, the LiFePo4 (2.5V to 3.7V, lets sa…

When the 5V source is present, the voltage after the schottky is about 4.7V. If the battery voltage is 3V, then current will flow through the body diode only if the mosfet source terminal is about 2.3V or lower. But it's 4.7V. So the body diode is reverse biased, and no current flows. That's rea…

Enhanced mosfet means, it is "open" only when activated over the gate by a negative voltage in comparison to the source. This is incorrect. A mosfet is "ON" (i.e. allows current flow) when there is a voltage from gate to source (Vgs). Vgs is positive for N channel devices and negative for P ch…

@jremington This was really a very useful link, thank you! I read the full thread and all the links that were shared and learned a lot and it helped me do understand it much better. @ShermanP thank you, I think especially in your first paragraph I found my issue of thinking about the body diode as …

Think of it as a draw bridge, closed to let traffic through open no traffic flows.

MOSFETs and load sharing: What does disable the channel AND the body diode?

Other Hardware General Electronics

jremington December 18, 2023, 5:59pm 2

Useful discussion here: TP4056 lithium charger module - modification to add power sharing

Topic		Replies	Views
How does this power path circuit work? General Electronics	6	381	November 29, 2025
Advice for building a 3.3V battery charging circuit with load sharing circuitry General Electronics	17	331	March 24, 2026
"power sharing" avec un MOSFET canal P Français	12	376	June 17, 2024
Help on P-Channel MOSFET Circuit General Electronics	10	1328	January 24, 2024
P channel MOSFET for Reverse polarity Protection General Guidance	6	1871	August 29, 2025

MOSFETs and load sharing: What does disable the channel AND the body diode?

Related topics