MIC5019 Datasheet, PDF (9/12 Pages) Micrel Semiconductor – Ultra-Small High-Side N-Channel MOSFET Driver with Integrated Charge Pump

Micrel, Inc.
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.
V_GS = V_OUT – (V_{LOAD SUPPLY} – V_DS)
V_OUT is determined from the driver supply voltage using
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.
MIC5019
July 2012
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