What is reverse-current blocking using external back-to-back MOSFETs?

Two N-channel MOSFETs are externally connected back-to-back (in a common-source configuration or a common-drain configuration) when a load switch using a gate drive IC needs a function for blocking the current flowing into the load switch in the reverse direction. This function is called reverse-current blocking.

Power multiplexer circuit with 2 input and 1 output is implemented on a small PCB.
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Power multiplexer circuit

Please also refer to the following documents for related explanations.

Application note

• Overcurrent Protection and Reverse Current Blocking of the Load Switch IC
• Basics of Load Switch ICs

FAQ

• Why are two MOSFETs used in series in the Lithium-ion secondary battery protection circuit?
• What attention should be paid when the reverse voltage is applied between drain and source of power MOSFET?

To product list of load switch ICs :

• External MOSFET Gate drive Products 

Main web page about load switch ICs

• MOSFET Gate Driver IC Overview
• 12V - 300V MOSFETs

Other information

• e-learning Power Management IC