MIC4421A/4422A
9A Peak Low-Side MOSFET Driver
Bipolar/CMOS/DMOS Process
General Description
MIC4421A and MIC4422A MOSFET drivers are rugged,
efficient, and easy to use. The MIC4421A is an inverting
driver, while the MIC4422A is a non-inverting driver.
Both versions are capable of 9A (peak) output and can
drive the largest MOSFETs with an improved safe
operating margin. The MIC4421A/4422A 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.
MIC4421A/4422A 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
MOSFET 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.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
High peak-output current: 9A Peak (typ.)
Wide operating range: 4.5V to 18V (typ.)
Minimum pulse width: 50ns
Latch-up proof: fully isolated process is inherently
immune to any latch-up
Input will withstand negative swing of up to 5V
High capacitive load drive: 47,000pF
Low delay time: 15ns (typ.)
Logic high input for any voltage from 2.4V to V
S
Low equivalent input capacitance: 7pF (typ.)
Low supply current: 500µA (typ.)
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
___________________________________________________________________________________________________________
Typical Application
Load
Voltage
V
S
+15V
1µF
0.1µF
MIC4422A
1
Load
VS
VS
IN
OUT
OUT
GND
7
Si9410DY*
N-Channel
MOSFET
8
6
0.1µF
On
Off
2
4,5
* Siliconix 30m, 7A max.
†
Load voltage limited by MOSFET drain-to-source rating
Low-Side Power Switch
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2007
M9999-062707
Micrel, Inc.
MIC4421A/4422A
Absolute Maximum Ratings
(1)
Supply Voltage (V
S
)......................................................+20V
Control Input Voltage (V
IN
). ............. V
S
+ 0.3V to GND – 5V
Control Input Current (V
IN
> V
S
). .................................50mA
Power Dissipation, T
A
< +25°C
(4)
PDIP (θ
JA
) ........................................................1478mW
SOIC (θ
JA
) ..........................................................767mW
TO-220 (θ
JA
)........................................................1756W
Lead Temperature (soldering, #sec.)......................... 300°C
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
S
)....................................... +4.5V to +18V
Ambient Temperature (T
A
)
A Version ............................................ –55°C to +125°C
B Version .............................................. –40°C to +85°C
C Version .................................................. 0°C to +70°C
Junction Temperature (T
J
) ......................................... 150°C
Package Thermal Resistance
(4)
PDIP (θ
JA
) .......................................................84.6°C/W
SOIC (θ
JA
) .....................................................163.0°C/W
TO-220 (θ
JA
)....................................................71.2°C/W
PDIP (θ
JC
) .......................................................41.2°C/W
SOIC (θ
JC
).......................................................38.8°C/W
TO-220 (θ
JC
) .....................................................6.5°C/W
Electrical Characteristics
T
A
= 25°C with 4.5V
≤
V
S
≤
18V,
bold
values indicate –55°C< T
A
< +125°C, unless noted.
Symbol
V
S
I
S
Parameter
Operating Input Voltage
High Output Quiescent Current
Low Output Quiescent Current
Input
V
IH
V
IL
V
IN
I
IN
Output
V
OH
V
OL
R
O
High Output Voltage
Low Output Voltage
Output Resistance,
Output High
Output Resistance,
Output Low
I
PK
I
DC
I
R
Peak Output Current
Continuous Output Current
Latch-Up Protection
Withstand Reverse Current
Rise Time
Fall Time
Delay Time
Duty Cycle
≤
2%
t
≤
300µs,
Note 5
Test Figure 1, C
L
= 10,000pF
Test Figure 1, C
L
= 10,000pF
Test Figure 1
>1500
See Figure 1
See Figure 1
I
OUT
= 10mA, V
S
= 18V
I
OUT
= 10mA, V
S
= 18V
V
S
= 18V (See Figure 8)
0.6
0.8
9
2
V
S
+.025
0.025
1.0
3.6
1.7
2.7
V
V
Ω
Ω
Ω
Ω
A
A
mA
Logic 1 Input Voltage
Logic 0 Input Voltage
Input Voltage Range
Input Current
0V
≤
V
IN
≤
V
S
See Figure 3
See Figure 3
–5
–10
3.0
2.1
1.5
0.8
V
S
+0.3
10
V
V
V
µA
V
IN
= 3V (MIC4422A), V
IN
= 0 (MIC4421A)
V
IN
= 0V (MIC4422A), V
IN
= 3V (MIC4421A)
Condition
Min
4.5
0.5
50
Typ
Max
18
1.5
3
150
200
Units
V
mA
mA
µA
µA
Power Supply
Switching Time (Note 5)
t
R
t
F
t
D1
20
24
15
75
120
75
120
68
80
ns
ns
ns
ns
ns
ns
June 2007
3
M9999-062707
Micrel, Inc.
Symbol
t
D2
t
PW
f
max
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Minimum footprint.
5. Guaranteed by design.
MIC4421A/4422A
Parameter
Delay Time
Minimum Input Pulse Width
Maximum Input Frequency
Condition
Test Figure 1
See Figure 1 and Figure 2.
See Figure 1 and Figure 2.
Min
Typ
35
50
1
Max
60
80
Units
ns
ns
ns
MHz
Switching Time (Note 5)
continued
Test Circuit
V
S
= 18V
0.1µF
V
IN
MIC4421A
0.1µF
V
OUT
10,000pF
4.7µF
V
S
= 18V
0.1µF
V
IN
MIC4422A
0.1µF
V
OUT
10,000pF
4.7µF
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
2.5V
t
PW
t
F
t
D2
50ns
t
R
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
2.5V
t
PW
t
R
t
D2
50ns
t
F
OUTPUT
10%
0V
OUTPUT
10%
0V
Figure 1. Inverting Driver Switching Time
Figure 2. Non-Inverting Driver Switching Time
Control Input Behavior
Logic 1
Logic 0
V
IL
0V
V
IL
0.8V
1.5V
2.1V
3V
V
IH
V
IH
V
S
Figure 3. Input Hysteresis
June 2007
4
M9999-062707
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