Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
- Low voltage-drop reverse current protection for battery when connecting adapter power
When connecting adapter power to a battery powered circuit, reverse current through the battery must be prevented to avoid battery damage.
This can be done with a diode, but that means at least a few hundred mV drop when the battery is powering the circuit, even with a Schottky diode, which wastes power and reduces battery life.
Here's a circuit that uses a MOSFET and comparator to perform that function, so that the forward drop is just the MOSFET on-resistance times the circuit current....
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