Micrel, Inc.

MIC5019

July 2012

9

A logic-level MOSFET is required. The MOSFET’s

maximum current is limited slightly because the gate is

not

fully

enhanced.

To

predict

the

MOSFETs

performance for any pair of supply voltages, calculate

the gate-to-source voltage and refer to the MOSFET

data sheet.

the “Typical Characteristics: Output Voltage vs. Supply

Voltage” graph.

Low-Side Switch Configuration

The low-side configuration makes it possible to switch a

voltage much higher than the MIC5019’s maximum

supply voltage.

Figure 7. Low-Side Switch Configuration

The maximum switched voltage is limited only by the

MOSFET’s maximum drain-to-source ratings.