MIC5021
Micrel
MIC5021
High-Speed High-Side MOSFET Driver
General Description
The MIC5021 high-side MOSFET driver is designed to oper-
ate at frequencies up to 100kHz (5kHz 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.
A rising or falling edge on the input results in a current source
pulse or sink pulse on the gate output. This output current
pulse can turn on a 2000pF MOSFET in approximately
550ns. The MIC5021 then supplies a limited current (< 2mA),
if necessary, to maintain the output state.
An overcurrent comparator with a trip voltage of 50mV makes
the MIC5021 ideal for use with a current sensing 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 C
T
pin to ground
may be used to control 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 C
T
to V
DD
.
The MIC5021 is available in 8-pin SOIC and plastic DIP
packages.
Other members of the MIC502x family include the MIC5020
low-side driver and the MIC5022 half-bridge driver with a
cross-conduction interlock.
Features
12V to 36V operation
550ns rise/fall time driving 2000pF
TTL compatible input with internal pull-down resistor
Overcurrent limit
Gate to source protection
Internal charge pump
100kHz operation guaranteed over full temperature and
operating voltage range
鈥?Compatible with current sensing MOSFETs
鈥?Current source drive reduces EMI
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Applications
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Lamp control
Heater control
Motor control
Solenoid switching
Switch-mode power supplies
Circuit breaker
Ordering Information
Part Number
MIC5021BM
MIC5021BN
Temperature Range
鈥?0掳C to +85掳C
鈥?0掳C to +85掳C
Package
8-pin SOIC
8-pin Plastic DIP
5
Typical Application
+12V to +36V
MIC5021
10碌F
TTL Input
optional*
1
2
3
4
V
DD
Input
C
T
Gnd
V
BOOST
Gate
Sense
Sense
8
7
6
5
2.7
nF
R
SENSE
R
SENSE =
50mV
I
TRIP
* increases time before retry
N-Channel
Power MOSFET
High-Side Driver with Overcurrent Trip and Retry
October 1998
5-169
Load
MIC5021相关型号PDF文件下载
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