MIC4421A/4422A
Micrel
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 mar-
gin. 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 nega-
tive 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 dis-
crete components, reducing PCB area requirements, simpli-
fying 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
•
•
•
•
•
•
•
•
•
•
•
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 (typ.): 7pF
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
MIC4421A
1
7
Load
VS
8
OUT
OUT
GND
4,5
6
Si9410DY*
N-Channel
MOSFET
VS
IN
0.1µF
On
Off
2
* Siliconix 30m
Ω
, 7A max.
†
Load voltage limited by MOSFET drain-to-source rating
Low-Side Power Switch
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
October 2002
1
MIC4421A/4422A
MIC4421A/4422A
Micrel
Absolute Maximum Ratings
(Note 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
) ............................... 50 mA
Power Dissipation, T
A
≤
25°C,
Note 4
PDIP (θ
JA
) ......................................................... 1478mW
SOIC (θ
JA
) ........................................................... 767mW
5-Pin TO-220 (θ
JA
) ............................................ 1756mW
Storage Temperature(T
S
) ........................ –65°C to +150°C
Lead Temperature (10 sec) ....................................... 300°C
ESD Rating,
Note 3
...................................................... 2kV
Operating Ratings
(Note 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,
Note 4
8-Pin PDIP
(θ
JA
) ............................................... 84.6°C/W
8-Pin SOIC
(θ
JA
) ............................................ 163.0°C/W
5-Pin TO-220
(θ
JA
) ........................................... 71.2°C/W
8-Pin PDIP
(θ
JC
) ............................................... 41.2°C/W
8-Pin SOIC
(θ
JC
) .............................................. 38.8°C/W
5-Pin TO-220
(θ
JC
) ............................................. 6.5°C/W
Electrical Characteristics
T
A
= 25°C with 4.5 V
≤
V
S
≤
18V,
bold
values indicate –55°C
≤
T
A
≤
+125°C; unless noted
Symbol
Power Supply
V
S
I
S
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
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
Continuous Output Current
Latch-Up Protection
Withstand Reverse Current
Duty Cycle
≤
2%
t
≤
300
µs,
Note 5
>1500
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 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
0 V
≤
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)
4.5
0.5
50
18
1.5
3
150
200
V
mA
mA
µA
µA
Parameter
Condition
Min
Typ
Max
Units
Switching Time (Note 5)
t
R
t
F
t
D1
t
D2
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
120
75
120
60
80
60
80
ns
ns
ns
ns
ns
ns
ns
ns
October 2002
3
MIC4421A/4422A
MIC4421A/4422A
Symbol
Parameter
Condition
Min
Typ
Max
Micrel
Units
Switching Time (Note 5)
t
PW
f
max
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Minimum Input Pulse Width
Maximum Input Frequency
See Figure 1. and Figure 2.
See Figure 1. and Figure 2.
50
1
ns
MHz
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Minimum footprint.
Guaranteed by design.
Test Circuits
V
S
= 18V
0.1µF
0.1µF
4.7µF
V
S
= 18V
0.1µF
0.1µF
4.7µF
V
IN
MIC4421A
V
OUT
10,000pF
V
IN
MIC4422A
V
OUT
10,000pF
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
2.5V
t
PW
≥
50ns
t
F
t
D2
t
R
INPUT
5V
90%
10%
0V
V
S
90%
t
D1
t
PW
t
R
2.5V
t
PW
≥
50ns
t
D2
t
F
OUTPUT
10%
0V
OUTPUT
10%
0V
Figure 1. Inverting Driver Switching Time
Figure 2. Noninverting Driver Switching Time
Control Input Behavior
Logic 1
Logic 0
Guaranteed
V
IL
Typical
Guaranteed
0.8V
1.5V
2.1V
3V
V
IH
Typical
0V
V
IL
V
IH
V
S
Figure 3. Input Hysteresis
MIC4421A/4422A
4
October 2002
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