MIC4421/4422
Micrel, Inc.
MIC4421/4422
9A-Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS
Process
General Description
MIC4421 and MIC4422 MOSFET drivers are rugged, ef-
ficient, 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 networks.
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
freedom from latch-up. The rail-to-rail swing capability of
CMOS/DMOS insures adequate gate voltage to the MOS-
FET during 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
0.1mA
0.3mA
MIC4421
IN V E R T I N G
OUT
IN
2kΩ
MIC4422
NONINVERTING
GND
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2005
1
M9999-081005
MIC4421/4422
(Notes 1, 2 and 3)
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
Micrel, Inc.
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
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
2.4
–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 6)
2
Duty Cycle ≤ 2%
t ≤ 300 µs
Test Figure 1, C
L
= 10,000 pF
Test Figure 1, C
L
= 10,000 pF
Test Figure 1
Test Figure 1
V
IN
= 3 V
V
IN
= 0 V
4.5
>1500
0.6
0.8
9
1.7
–10
V
S
–.025
0.025
Typ
1.3
1.1
0.8
V
S
+0.3
10
Max
Units
V
V
V
µA
V
V
Ω
Ω
A
A
mA
Continuous Output Current
Latch-Up Protection
Withstand Reverse Current
Rise Time
Fall Time
Delay Time
Delay Time
Power Supply Current
Operating Input Voltage
SWITCHING TIME
(Note 3)
t
R
t
F
t
D1
t
D2
I
S
V
S
20
24
15
35
0.4
80
75
75
60
60
1.5
150
18
ns
ns
ns
ns
mA
µA
V
POWER SUPPLY
August 2005
3
M9999-081005
MIC4421/4422
Micrel, Inc.
(Over operating temperature range with 4.5V ≤ V
S
≤ 18V unless otherwise specified.)
Conditions
Min
2.4
–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
Typ
1.4
1.0
0.8
V
S
+0.3
10
Max
Units
V
V
V
µA
V
V
Ω
Ω
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
Rise Time
Fall Time
Delay Time
Delay Time
Power Supply Current
Operating Input Voltage
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
Parameter
SWITCHING TIME
(Note 3)
t
R
t
F
t
D1
t
D2
I
S
V
S
Note 1:
Note 2:
Note 3:
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1
Figure 1
V
IN
= 3V
V
IN
= 0V
4.5
23
30
20
40
0.6
0.1
120
120
80
80
3
0.2
18
ns
ns
ns
ns
mA
V
POWER SUPPLY
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
0.1µF
V
S
= 18V
0.1µF
4.7µF
0.1µF
0.1µF
4.7µF
IN
MIC4421
OUT
15000pF
IN
MIC4422
OUT
15000pF
INPUT
5V
90%
10%
0V
2.5V
t
P W
≥ 0.5µs
t
D1
INPUT
5V
90%
10%
0V
2.5V
t
P W
≥ 0.5µs
t
D1
t
P W
V
S
90%
t
F
t
D2
t
R
t
P W
V
S
90%
t
R
t
D2
t
F
O U TPU T
10%
0V
O U TPU T
10%
0V
Figure 1. Inverting Driver Switching Time
M9999-081005
Figure 2. Noninverting Driver Switching Time
4
August 2005
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