Industry White Paper

Paralleling Power MOSFETs in High Current Applications

Application Note Overview

Power MOSFETs with the lowest possible conduction resistance RDS(on) are in high demand due to the ever-growing need for higher power in low voltage applications. In many applications, a single MOSFET is insufficient to carry the necessary current. When paralleling MOSFETs in power converters, design engineers face uneven current sharing and imbalance of power dissipation between paralleled MOSFETs because MOSFETs are imperfectly synchronized during turn-on and turn-off processes.

This application note highlights the MOSFET parameters playing an important role in current sharing. It also quantifies the additional power loss incurred in a MOSFET carrying more current due to the current sharing imbalance.

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