MIC4421/4422
Micrel
MIC4421/4422
9A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS
Process
General Description
MIC4421 and MIC4422 MOSFET drivers are rugged, effi-
cient, and easy to use. The MIC4421 is an inverting driver,
while the MIC4422 is a non-inverting driver.
Both versions are capable of 9A (peak) output and can drive
the largest MOSFETs with an improved safe operating mar-
gin. The MIC4421/4422 accepts any logic input from 2.4V to
V
S
without external speed-up capacitors or resistor net-
works. Proprietary circuits allow the input to swing negative
by as much as 5V without damaging the part. Additional
circuits protect against damage from electrostatic discharge.
MIC4421/4422 drivers can replace three or more discrete
components, reducing PCB area requirements, simplifying
product design, and reducing assembly cost.
Modern Bipolar/CMOS/DMOS construction guarantees free-
dom from latch-up. The rail-to-rail swing capability of CMOS/
DMOS insures adequate gate voltage to the MOSFET dur-
ing power up/down sequencing. Since these devices are
fabricated on a self-aligned process, they have very low
crossover current, run cool, use little power, and are easy to
drive.
Features
• BiCMOS/DMOS Construction
• Latch-Up Proof: Fully Isolated Process is Inherently
Immune to Any Latch-up.
• Input Will Withstand Negative Swing of Up to 5V
• Matched Rise and Fall Times ............................... 25ns
• High Peak Output Current .............................. 9A Peak
• Wide Operating Range .............................. 4.5V to 18V
• High Capacitive Load Drive ........................... 47,000pF
• Low Delay Time ........................................... 30ns Typ.
• Logic High Input for Any Voltage from 2.4V to V
S
• Low Equivalent Input Capacitance (typ) ................. 7pF
• Low Supply Current .............. 450µA With Logic 1 Input
• Low Output Impedance ........................................ 1.5Ω
• Output Voltage Swing to Within 25mV of GND or V
S
Applications
•
•
•
•
•
•
•
•
Switch Mode Power Supplies
Motor Controls
Pulse Transformer Driver
Class-D Switching Amplifiers
Line Drivers
Driving MOSFET or IGBT Parallel Chip Modules
Local Power ON/OFF Switch
Pulse Generators
Functional Diagram
V
S
0.3mA
0.1mA
MIC4421
INVERTING
OUT
IN
2kΩ
MIC4422
NON-INVERTING
GND
5-42
April 1998
MIC4421/4422
Micrel
(Notes 1, 2 and 3)
Absolute Maximum Ratings
Operating Ratings
Junction Temperature ............................................... 150°C
Ambient Temperature
C Version ................................................... 0°C to +70°C
B Version ................................................ –40°C to +85°C
Thermal Resistance
5-Pin TO-220
(θ
JC
) .............................................. 10°C/W
Supply Voltage .............................................................. 20V
Input Voltage .................................. V
S
+ 0.3V to GND – 5V
Input Current (V
IN
> V
S
) ............................................ 50 mA
Power Dissipation, T
A
≤
25°C
PDIP .................................................................... 960mW
SOIC ................................................................. 1040mW
5-Pin TO-220 .............................................................. 2W
Power Dissipation, T
CASE
≤
25°C
5-Pin TO-220 ......................................................... 12.5W
Derating Factors (to Ambient)
PDIP ................................................................ 7.7mW/°C
SOIC ............................................................... 8.3mW/°C
5-Pin TO-220 .................................................... 17mW/°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature (10 sec) ....................................... 300°C
Electrical Characteristics:
Symbol
INPUT
V
IH
V
IL
V
IN
I
IN
OUTPUT
V
OH
V
OL
R
O
R
O
I
PK
I
DC
I
R
High Output Voltage
Low Output Voltage
Output Resistance,
Output High
Output Resistance,
Output Low
Peak Output Current
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
Parameter
(T
A
= 25°C with 4.5 V
≤
V
S
≤
18 V unless otherwise specified.)
Conditions
Min
Typ
Max
Units
2.4
1.3
1.1
0.8
V
S
+0.3
10
V
V
V
µA
–5
0 V
≤
V
IN
≤
V
S
See Figure 1
See Figure 1
I
OUT
= 10 mA, V
S
= 18 V
I
OUT
= 10 mA, V
S
= 18 V
V
S
= 18 V (See Figure 5)
2
Duty Cycle
≤
2%
t
≤
300
µs
>1500
0.6
0.8
9
–10
V
S
–.025
0.025
V
V
Ω
1.7
Ω
A
A
mA
Continuous Output Current
Latch-Up Protection
Withstand Reverse Current
SWITCHING TIME
(Note 3)
t
R
t
F
t
D1
t
D2
Power Supply
I
S
V
S
Power Supply Current
Operating Input Voltage
V
IN
= 3 V
V
IN
= 0 V
4.5
0.4
80
1.5
150
18
mA
µA
V
Rise Time
Fall Time
Delay Time
Delay Time
Test Figure 1, C
L
= 10,000 pF
Test Figure 1, C
L
= 10,000 pF
Test Figure 1
Test Figure 1
20
24
15
35
75
75
60
60
ns
ns
ns
ns
5-44
April 1998
MIC4421/4422
Micrel
(Over operating temperature range with 4.5V
≤
V
S
≤
18V unless otherwise specified.)
Conditions
Min
Typ
Max
Units
Electrical Characteristics:
Symbol
INPUT
V
IH
V
IL
V
IN
I
IN
OUTPUT
V
OH
V
OL
R
O
R
O
High Output Voltage
Low Output Voltage
Output Resistance,
Output High
Output Resistance,
Output Low
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
Parameter
2.4
1.4
1.0
0.8
V
S
+0.3
10
V
V
V
µA
–5
0V
≤
V
IN
≤
V
S
Figure 1
Figure 1
I
OUT
= 10mA, V
S
= 18V
I
OUT
= 10mA, V
S
= 18V
0.8
1.3
–10
V
S
–.025
0.025
3.6
2.7
V
V
Ω
Ω
SWITCHING TIME
(Note 3)
t
R
t
F
t
D1
t
D2
I
S
V
S
NOTE 1:
NOTE 2:
NOTE 3:
Rise Time
Fall Time
Delay Time
Delay Time
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1
Figure 1
23
30
20
40
120
120
80
80
ns
ns
ns
ns
POWER SUPPLY
Power Supply Current
Operating Input Voltage
V
IN
= 3V
V
IN
= 0V
4.5
0.6
0.1
3
0.2
18
mA
V
5
Functional operation above the absolute maximum stress ratings is not implied.
Static-sensitive device. Store only in conductive containers. Handling personnel and equipment should be grounded to
prevent damage from static discharge.
Switching times guaranteed by design.
Test Circuits
V
S
= 18V
V
S
= 18V
0.1µF
0.1µF
4.7µF
0.1µF
0.1µF
4.7µF
IN
MIC4421
OUT
15000pF
IN
MIC4422
OUT
15000pF
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
2.5V
t
PW
≥
0.5µs
t
F
t
D2
t
R
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
t
R
2.5V
t
PW
≥
0.5µs
t
D2
t
F
OUTPUT
10%
0V
OUTPUT
10%
0V
Figure 1. Inverting Driver Switching Time
April 1998
5-45
Figure 2. Noninverting Driver Switching Time
PCB Design
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