Contact us

A new window will open A new window will open

When using a MOSFET as a load switch, how do I reduce the inrush current that occurs?

The following figure is a circuit diagram showing the use of a MOSFET as a load switch.
Generally, large capacitor Co for voltage stabilization is connected to the output side of the MOSFET.
When the MOSFET turns on, inrush current IRUSH flows to charge this capacitor.
This inrush current is reduced by increasing the series gate resistor Rgate.
When the gate resistance increases, the rising output current becomes less pronounced.
However, if increasing gate resistance affects the switching speed and loss, it is necessary to select the suitable gate resistance on your using condition.
For how to determine the gate resistance, please refer to “MOSFET Gate Drive Circuit:Power MOSFET Application Notes.”

Additionally, Toshiba offers a lineup of load switch ICs that can reduce inrush current. Please refer to the lineup and consider using it.

To Top
·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.