MIC5021 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – High-Speed High-Side MOSFET Driver

MIC5021
Micrel
MIC5021
High-Speed High-Side MOSFET Driver
General Description
Features
The MIC5021 high-side MOSFET driver is designed to oper- • 12V to 36V operation
ate at frequencies up to 100kHz (5kHz PWM for 2% to 100% • 550ns rise/fall time driving 2000pF
duty cycle) and is an ideal choice for high speed applications • TTL compatible input with internal pull-down resistor
such as motor control, SMPS (switch mode power supplies), • Overcurrent limit
and applications using IGBTs. The MIC5021 can also • Gate to source protection
operate as a circuit breaker with or without automatic retry. • 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 output current
pulse can turn on a 2000pF MOSFET in approximately
550ns. The MIC5021 then supplies a limited current (< 2mA),
• 100kHz operation guaranteed over full temperature and
operating voltage range
• Compatible with current sensing MOSFETs
• Current source drive reduces EMI
if necessary, to maintain the output state.
Applications
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%
• Lamp control
• Heater control
• Motor control
• Solenoid switching
• Switch-mode power supplies
• Circuit breaker
is possible with an optional pull-up resistor from C_T to V_DD. _{Ordering Information}
The MIC5021 is available in 8-pin SOIC and plastic DIP
5
packages.
Part Number
Temperature Range
Package
Other members of the MIC502x family include the MIC5020 ^MIC5021BM
–40°C to +85°C
8-pin SOIC
low-side driver and the MIC5022 half-bridge driver with a ^MIC5021BN
–40°C to +85°C 8-pin Plastic DIP
cross-conduction interlock.
Typical Application
10µF
TTL Input
optional*
+12V to +36V
MIC5021
1
V_DD
8
V_BOOST
2
Input
7
Gate
3
C_T
6
Sense
4
5
Gnd Sense
N-Channel
Power MOSFET
2.7
nF
R_SENSE
R_SENSE =
50mV
I_TRIP
* increases time before retry
October 1998
High-Side Driver with Overcurrent Trip and Retry
5-169