MIC5021
High-Speed, High-Side MOSFET Driver with Charge Pump
and Overcurrent Limit
Features
General Description
• 12V to 36V Operation
The MIC5021 high-side MOSFET driver is designed to
operate at frequencies up to 100 kHz (5 kHz PWM for
2% to 100% duty cycle) and is an ideal choice for high
speed applications such as motor control, SMPS
(switch mode power supplies), and applications using
IGBTs. The MIC5021 can also operate as a circuit
breaker with or without automatic retry.
• 550 ns Rise/Fall Time Driving 2000 pF
• TTL-Compatible Input with Internal Pull-Down
Resistor
• Overcurrent Limit
• Gate-to-Source Protection
• Internal Charge Pump
A rising or falling edge on the input results in a current
source pulse or sink pulse on the gate output. This out-
put current pulse can turn on a 2000 pF MOSFET in
approximately 550 ns. The MIC5021 then supplies a
limited current (<2 mA), if necessary, to maintain the
output state.
• 100 kHz Operation Guaranteed Over Full Tem-
perature and Operating Voltage Range
• Compatible with Current-Sensing MOSFETs
• Current-Source Drive Reduces EMI
Applications
• Lamp Control
An overcurrent comparator with a trip voltage of 50 mV
makes the MIC5021 ideal for use with a current-sens-
ing MOSFET. An external low value resistor may be
used instead of a sensing MOSFET for more precise
overcurrent control. An optional external capacitor
placed from the CT pin to ground may be used to con-
trol the current shutdown duty cycle (dead time) from
20% to <1%. A duty cycle from 20% to about 75% is
possible with an optional pull-up resistor from CT to
• Heater Control
• Motor Control
• Solenoid Switching
• Switch-Mode Power Supplies
• Circuit Breaker
VDD. Additional parts of the MIC502x family include the
MIC5020 low-side driver and the MIC5022 half-bridge
driver with a cross-conduction interlock. The MIC5021
is available in 8-pin SOIC and plastic DIP packages.
Typical Application Circuit
MIC5021
PDIP & SOIC
High-Side Driver with Overcurrent Trip and Retry
+12V to +36V
MIC5021
1
2
3
4
8
7
6
10μF
TTL INPUT
V
V
DD
BOOST
N-CHANNEL
INPUT
GATE
POWER MOSFET
C
SENSE-
T
2.7
nF
OPTIONAL*
SENSE+ 5
GND
RSENSE
= 50mV
RSENSE
ITRIP
LOAD
* INCREASES TIME BEFORE RETRY
2016 Microchip Technology Inc.
DS20005677A-page 1