MIC4608/4609
Micrel
MIC4608/4609
9A-Peak Open-Drain MOSFET Driver
Preliminary Information
General Description
The MIC4608/4609 are BiCMOS/DMOS buffer-drivers con-
structed with complementary MOS outputs, where the drains
of the final output totem poles have been left disconnected so
individual connections can be made to the pull-up and pull-
down sections of the output, thus allowing the user to define
the rates of rise and fall times desired for a capacitive load, or
a reduced output swing if driving a resistive load, or to limit
base current when driving a bipolar transistor. Minimum rise
and fall times, with no resistors, will be less than 30ns for a
10,000pF load. There is no upper limit.
These devices are rugged due to extra steps taken to protect
them from failures. A modern Bipolar/CMOS/DMOS process
guarantees freedom from latchup. Proprietary circuits allow
the input to swing negative as much as 5V without damaging
the part.
For driving MOSFETs in motor-control applications, where
slow-on/fast-off operation is desired, the MIC4608/4609 is
superior to the previously-used technique of adding a diode-
resistor combination between the driver output and the MOS-
FET, because it allows accurate control of turn-on, while
maintaining fast turn-off and maximum noise immunity for the
device being driven.
Features
Independently Programmable Rise and Fall Times
High Peak Output Current ................................. 9A peak
Low Output Impedance ....................................... 1Ω typ.
High Speed t
R
, t
F ..................................
<30ns with 10,000pF
Short Delay Times .......................................... <30ns typ.
Wide Operating Range ................................. 4.5V to 18V
Latch-up Protected: Fully Isolated Process is Inherently
Immune to Any Latch-Up.
• Input Withstands Negative Swings to –5V
• ESD Protected ...........................................................2kV
•
•
•
•
•
•
•
Applications
•
•
•
•
•
•
•
•
•
Power Switch
Motor Controls
Self-Commutating MOSFET Bridge Driver
Driving Bipolar Transistors
Driver for Nonoverlapping Totem Poles
Pulse Generator
Line Driver
Power Management
Level Shifters
Functional Diagram
V
DD
Pin Configuration
V DD
INPUT
1
2
3
4
8
V DD
Pull-Up
Pull-Down
GND
MIC4608
7
6
5
0.3mA
0.1mA
MIC4608
INVERTING
UP
IN
2kΩ
MIC4609
NONINVERTING
GND
DWN
N.C.
GND
V DD
INPUT
N.C.
GND
1
2
3
4
8
V DD
Pull-Up
Pull-Down
GND
MIC4609
7
6
5
6-18
MIC4608/4609
When used to drive bipolar transistors, this driver maintains
high speeds and allows insertion of a base current-limiting
resistor, and also provides a separate half-output for fast turn-
off. By proper positioning of the resistor, either NPN or PNP
transistors can be driven.
For driving many loads in low-power systems, this driver,
because it has very low quiescent current (<80µA) and
eliminates shoot-through current in the output stage, requires
significantly less power than similar drivers and can be helpful
in meeting low-power budgets.
Due to independent drains, this device can also be used as
an open-drain buffer/driver where both drains are available in
one device, thus minimizing chip count. An unused pull-down
should be returned to the ground; an unused pull-up should
be returned to V
DD
. This is to prevent static damage.
Alternatively, in situations requiring greater current-carrying
capacity, multiple MIC4608 or MIC4609s may be paralleled.
The MIC4608/4609 will not latch under any conditions within
its power and voltage ratings. It is not subject to damage
when up to 5V of noise spiking of either polarity occurs on the
ground pin. It can accept, without damage or logic upset, up
to 1.5 amps of reverse current (of either polarity) being forced
back into the outputs.
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage ........................................................... +22V
Maximum Die Temperature ..................................... +150°C
Storage Temperature Range .................... –65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................... +300°C
Package Thermal Resistance
CerDIP
θ
JA
....................................................... 150°C/W
CerDIP
θ
JC
........................................................ 55°C/W
PDIP
θ
JA
............................................................125°C/W
PDIP
θ
JC
............................................................. 45°C/W
SOIC
θ
JA
.......................................................... 250°C/W
SOIC
θ
JC
............................................................ 75°C/W
6
Ordering Information
Part Number
MIC4608BN
MIC4608BM
MIC4609BN
MIC4609BM
Logic
Inverting
Inverting
Non-inverting
Non-inverting
Package
8-pin PDIP
8-pin SOIC
8-pin PDIP
8-pin SOIC
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Note 1:
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions above those indicated in the operational sections of the specification is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. Static-sensitive device. Unused devices must
be stored in conductive material. Protect devices from static discharge and static fields.
6-19
MIC4608/4609
Micrel
Electrical Characteristics
Unless otherwise specified, specifications measured at T
A
= 25°C with 4.5V
≤
V
DD
≤
18V.
Symbol
Input
V
IH
V
IL
I
IN
Output
V
OH
V
OL
R
O
R
O
I
PK
I
R
Parameter
Test Conditions
Min
Typ
Max
Unit
Logic 1 High Input Voltage
Logic 0 Low Input Voltage
Input Current
0V < V
IN
< V
DD
2.4
–5
–10
V
DD
+ 0.3
0.8
10
V
V
µA
High Output Voltage
Low Output Voltage
Output Resistance, Pull-Up
Output Resistance, Pull-Down
Peak Output Current
Latch-up Protection Withstand
Reverse Current
t < 300µs, Duty Cycle
≤
2%
I
OUT
= 10mA, V
DD
= 18V
I
OUT
= 10mA, V
DD
= 18V
V
DD
– 0.025
0.025
0.9
1.0
9
>1500
1.7
2.5
V
V
Ω
Ω
A
mA
Switching Time
t
R
t
F
t
D1
t
D2
Rise Time
Fall Time
Delay Time
Delay Time
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
25
25
30
33
60
60
60
60
ns
ns
ns
ns
Power Supply
I
S
Power Supply Current
V
IN
= 3V
V
IN
= 0V
0.4
0.08
1.5
0.15
mA
mA
VDD = 18V
+5V
INPUT
10%
0.4V
+
1.0µF
90%
T D1
TF
90%
T D2
TR
90%
10%
18V
OUTPUT
1
8
10%
0.1µF
0V
0.1µF
INVERTING DRIVER
+5V
OUTPUT
7
INPUT
2
6
90%
INPUT
10%
0.4V
T D1
TR
18V
OUTPUT
10%
0V
10%
90%
T D2
90%
CL = 4700pF
TF
4
5
NON-INVERTING DRIVER
Figure 1.
MIC4608/4609 Switching time test circuit.
6-20
MIC4608/4609
Micrel
Electrical Characteristics, continued
Specifications measured
over operating temperature range
with 4.5V
≤
V
DD
≤
18V, unless otherwise specified.
Symbol
Input
V
IH
V
IL
I
IN
Output
V
OH
V
OL
R
O
R
O
Parameter
Test Conditions
Min
Typ
Max
Unit
Logic 1 High Input Voltage
Logic 0 Low Input Voltage
Input Current
0V
≤
V
IN
≤
V
DD
2.4
–5
–10
V
DD
+ 0.3
0.8
10
V
V
µA
High Output Voltage
Low Output Voltage
Output Resistance, Pull-Up
Output Resistance, Pull-Down
I
OUT
= 10mA, V
DD
= 18V
I
OUT
= 10mA, V
DD
= 18V
V
DD
– 0.025
0.025
1.4
1.5
5
5
V
V
Ω
Ω
Switching Time (Note 1)
t
R
t
F
t
D1
t
D2
Rise Time
Fall Time
Delay Time
Delay Time
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1, C
L
= 10,000pF
Figure 1, C
L
=10,000pF
30
40
30
40
80
80
80
80
ns
ns
ns
ns
Power Supply
I
S
Power Supply Current
V
IN
= 3V
V
IN
= 0V
0.6
0.1
3
0.2
mA
mA
6
6-21
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