MIC5022_05 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – Half-Bridge MOSFET Driver

MIC5022
MIC5022
Micrel, Inc.
Half-Bridge MOSFET Driver
Not Recommended for New Designs
General Description
The MIC5022 half-bridge MOSFET driver is designed to
operate 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 and SMPS (switch mode
power supplies).
A rising or falling edge on the input results in a current source
pulse or sink pulse on the gate outputs. This output current
pulse can turn on a 2000pF MOSFET in approximately 1µs.
The MIC5022 then supplies a limited current (< 2mA), if
necessary, to maintain the output states.
Two overcurrent comparators with nominal trip voltages of
50mV make the MIC5022 ideal for use with current sensing
MOSFETs. External low value resistors may be used instead
of sensing MOSFETs for more precise overcurrent control.
Optional external capacitors placed on the C_TH and C_TL pins
may be used to individually control the current shutdown duty
cycles from approximately 20% to <1%. Duty cycles from
20% to about 75% are possible with individual pull-up resistors
from C_TL and C_TH to V_DD. An open collector output provides
a fault indication when either sense input is tripped.
The MIC5022 is available in 16-pin wide SOIC and 14-pin
plastic DIP packages.
Other members of the MIC502x family include the MIC5020
low-side driver and the MIC5021 high-side driver.
Features
• 12V to 36V operation
• 600ns rise time into 1000pF (high side)
• TTL compatible input with internal pull-down resistor
• Outputs interlocked to prevent cross conduction
• TTL compatible enable
• Fault output indication
• Individual overcurrent limits
• Gate protection
• Internal charge pump (high-side)
• Current source drive scheme reduces EMI
Applications
• Motor control
• Switch-mode power supplies
Ordering Information
Part Number
Temperature Range
MIC5022BWM
–40°C to +85°C
MIC5022BN
–40°C to +85°C
Package
16-pin Wide SOIC
14-pin Plastic DIP
Typical Application
+12V to +36V
TTL Input
(PWM signal)
C_{T H}
C_{T L}
MIC5022
1
14
10µF2 ^VDD
V_BOOST
13
Input Gate H
3
12
Fault Sense H–
4
11
C_TH Sense H+
5
10
Enable Gate L
6
C_TL
7
Gnd
9
Sense L–
8
Sense L+
2.7nF
R_{S 1}
M
R_{S 2}
DC Motor Control Application
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2005
1
MIC5022