Micrel, Inc.

MIC4414/MIC4415

August 2012

11

M9999-080112-A

When the MOSFET is driven off, the slower rise occurs

because the MOSFET’s output capacitance recharges

through the load resistance (RC circuit). A lower load

resistance allows the output to rise faster. For the fastest

driver operation, choose the smallest power MOSFET

that will safely handle the desired voltage, current, and

safety margin. The smallest MOSFETs generally have

the lowest capacitance.