3-1
File Number
2853.3
ICL7667
Dual Power MOSFET Driver
The ICL7667 is a dual monolithic high-speed driver
designed to convert TTL level signals into high current
outputs at voltages up to 15V. Its high speed and current
output enable it to drive large capacitive loads with high slew
rates and low propagation delays. With an output voltage
swing only millivolts less than the supply voltage and a
maximum supply voltage of 15V, the ICL7667 is well suited
for driving power MOSFETs in high frequency switched-
mode power converters. The ICL7667's high current outputs
minimize power losses in the power MOSFETs by rapidly
charging and discharging the gate capacitance. The
ICL7667's inputs are TTL compatible and can be directly
driven by common pulse-width modulation control ICs.
Functional Diagram
Features
Fast Rise and Fall Times
- 30ns with 1000pF Load
Wide Supply Voltage Range
- V
CC
= 4.5V to 15V
Low Power Consumption
- 4mW with Inputs Low
- 20mW with Inputs High
TTL/CMOS Input Compatible Power Driver
- R
OUT
= 7
Typ
Direct Interface with Common PWM Control ICs
Pin Equivalent to DS0026/DS0056; TSC426
Applications
Switching Power Supplies
DC/DC Converters
Motor Controllers
Pinouts
ICL7667 (CAN)
TOP VIEW
ICL7667 (PDIP, SOIC, CERDIP)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP. RANGE
(
o
C)
PACKAGE
PKG. NO.
ICL7667CBA
0 to 70
8 Ld SOIC (N)
M8.15
ICL7667CPA
0 to 70
8 Ld PDIP
E8.3
ICL7667CJA
0 to 70
8 Ld CERDIP
F8.3A
ICL7667CTV
0 to 70
8 Pin Metal Can T8.C
ICL7667MTV
(Note 1)
-55 to 125
8 Pin Metal Can T8.C
ICL7667MJA
(Note 1)
-55 to 125
8 Ld CERDIP
F8.3A
NOTE:
1. Add /883B to Part Number for 883B Processing
V
CC
IN
2mA
OUT
V+
N/C
N/C
V-
OUT A
IN A
OUT B
IN B
2
4
6
1
3
7
5
8
N/C
OUT A
V+
OUT B
N/C
IN A
V-
IN B
1
2
3
4
8
7
6
5
Data Sheet
April 1999
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Copyright
Intersil Corporation 1999
3-2
Absolute Maximum Ratings
Thermal Information
Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . V- -0.3V to V+ +0.3V
Package Dissipation, T
A
25
o
C . . . . . . . . . . . . . . . . . . . . . . . .500mW
Operating Temperature Range
ICL7667C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to 70
o
C
ICL7667M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55
o
C to 125
o
C
Thermal Resistance (Typical, Note 2)
JA
(
o
C/W)
JC
(
o
C/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
150
N/A
SOIC Package . . . . . . . . . . . . . . . . . . .
170
N/A
Metal Can Package . . . . . . . . . . . . . . .
156
68
CERDIP Package . . . . . . . . . . . . . . . . .
115
30
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
2.
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER
SYMBOL
TEST CONDITIONS
ICL7667C, M
ICL7667M
UNITS
T
A
= 25
o
C
-55
o
C
T
A
125
o
C
MIN
TYP
MAX
MIN
TYP
MAX
DC SPECIFICATIONS
Logic 1 Input Voltage
V
IH
V
CC
= 4.5V
2.0
-
-
2.0
-
-
V
Logic 1 Input Voltage
V
IH
V
CC
= 15V
2.0
-
-
2.0
-
-
V
Logic 0 Input Voltage
V
IL
V
CC
= 4.5V
-
-
0.8
-
-
0.5
V
Logic 0 Input Voltage
V
IL
V
CC
= 15V
-
-
0.8
-
-
0.5
V
Input Current
I
IL
V
CC
= 15V, V
IN
= 0V and 15V
-0.1
-
0.1
-0.1
-
0.1
A
Output Voltage High
V
OH
V
CC
= 4.5V and 15V
V
CC
-0.05
V
CC
-
V
CC
-0.1
V
CC
-
V
Output Voltage Low
V
OL
V
CC
= 4.5V and 15V
-
0
0.05
-
-
0.1
V
Output Resistance
R
OUT
V
IN
= V
IL
, I
OUT
= -10mA, V
CC
= 15V
-
7
10
-
-
12
Output Resistance
R
OUT
V
IN
= V
IH
, I
OUT
= 10mA, V
CC
= 15V
-
8
12
-
-
13
Power Supply Current
I
CC
V
CC
= 15V, V
IN
= 3V both inputs
-
5
7
-
-
8
mA
Power Supply Current
I
CC
V
CC
= 15V, V
IN
= 0V both inputs
-
150
400
-
-
400
A
SWITCHING SPECIFICATIONS
Delay Time
T
D2
Figure 3
-
35
50
-
-
60
ns
Rise Time
T
R
Figure 3
-
20
30
-
-
40
ns
Fall Time
T
F
Figure 3
-
20
30
-
-
40
ns
Delay Time
T
D1
Figure 3
-
20
30
-
-
40
ns
NOTE: All typical values have been characterized but are not tested.
ICL7667
3-3
Test Circuits
ICL7667
INPUT
INPUT RISE AND
FALL TIMES
10ns
C
L
= 1000pF
4.7
F
0.1
F
+
OUTPUT
V- = 15V
90%
10%
10%
90%
10%
T
D1
t
f
90%
t
r
T
D2
0.4V
15V
INPUT
+5V
0V
OUTPUT
Typical Performance Curves
FIGURE 1. RISE AND FALL TIMES vs C
L
FIGURE 2. T
D1
, T
D2
vs TEMPERATURE
FIGURE 3. t
r
, t
f
vs TEMPERATURE
FIGURE 4. I
CC
vs C
L
t
RISE
t
FALL
10
100
1000
10K
100K
C
L
(pF)
t
r
AND t
f
, (ns)
1
s
100
10
1
V
CC
= 15V
100
90
80
70
60
50
40
30
20
10
0
-55
0
25
70
125
TEMPERATURE (
o
C)
C
L
= 1nF
V
CC
= 15V
T
D2
T
D1
T
D1
AND T
D2
, (ns)
-55
0
25
70
125
50
40
30
20
10
0
TEMPERATURE (
o
C)
t
r
AND t
f
C
L
= 1nF
V
CC
= 15V
t
r
AND t
f
, (ns)
30
10
3.0
1
10
100
1K
10K
I
CC
(mA)
200kHz
20kHz
V
CC
= 15V
100K
C
L
(pF)
ICL7667
3-4
Detailed Description
The ICL7667 is a dual high-power CMOS inverter whose
inputs respond to TTL levels while the outputs can swing as
high as 15V. Its high output current enables it to rapidly
charge and discharge the gate capacitance of power
MOSFETs, minimizing the switching losses in switchmode
power supplies. Since the output stage is CMOS, the output
will swing to within millivolts of both ground and V
CC
without
any external parts or extra power supplies as required by the
DS0026/56 family. Although most specifications are at V
CC
=
15V, the propagation delays and specifications are almost
independent of V
CC
.
In addition to power MOS drivers, the ICL7667 is well suited
for other applications such as bus, control signal, and clock
drivers on large memory of microprocessor boards, where
the load capacitance is large and low propagation delays are
required. Other potential applications include peripheral
power drivers and charge-pump voltage inverters.
Input Stage
The input stage is a large N-Channel FET with a P-channel
constant-current source. This circuit has a threshold of about
1.5V, relatively independent of the VCC voltage. This means
that the inputs will be directly compatible with TTL over the
entire 4.5V - 15V V
CC
range. Being CMOS, the inputs draw
less than 1
A of current over the entire input voltage range
of ground to V
CC
. The quiescent current or no load supply
current of the ICL7667 is affected by the input voltage, going
to nearly zero when the inputs are at the 0 logic level and
rising to 7mA maximum when both inputs are at the 1 logic
level. A small amount of hysteresis, about 50mV to 100mV at
the input, is generated by positive feedback around the
second stage.
Output Stage
The ICL7667 output is a high-power CMOS inverter,
swinging between ground and VCC. At V
CC
= 15V, the
output impedance of the inverter is typically 7
. The high
FIGURE 5. I
CC
vs FREQUENCY
FIGURE 6. NO LOAD I
CC
vs FREQUENCY
FIGURE 7. DELAY AND FALL TIMES vs V
CC
FIGURE 8. RISE TIME vs V
CC
Typical Performance Curves
(Continued)
FREQUENCY (Hz)
I
CC
(mA)
V
CC
= 15V
V
CC
= 5V
C
L
= 1nF
100
10
1
100
A
10K
100K
1M
10M
100
10
1
100mA
10k
100k
1M
10M
V
CC
= 15V
V
CC
= 5V
C
L
= 10pF
FREQUENCY (Hz)
I
CC
(mA)
t
f
t
D1
V
CC
(V)
C
L
= 1nF
t
D1
AND t
f
, (ns)
50
40
30
20
10
0
5
10
15
V
CC
(V)
t
r
= T
D2
C
L
= 10pF
50
40
30
20
10
0
5
10
15
t
r
AND t
D2
, (ns)
ICL7667
3-5
peak current capability of the ICL7667 enables it to drive a
1000pF load with a rise time of only 40ns. Because the
output stage impedance is very low, up to 300mA will flow
through the series N-Channel and P-channel output devices
(from V
CC
to ground) during output transitions. This crossover
current is responsible for a significant portion of the internal
power dissipation of the ICL7667 at high frequencies. It can be
minimized by keeping the rise and fall times of the input to the
ICL7667 below 1
s.
Application Notes
Although the ICL7667 is simply a dual level-shifting inverter,
there are several areas to which careful attention must be
paid.
Grounding
Since the input and the high current output current paths
both include the ground pin, it is very important to minimize
and common impedance in the ground return. Since the
ICL7667 is an inverter, any common impedance will
generate negative feedback, and will degrade the delay, rise
and fall times. Use a ground plane if possible, or use
separate ground returns for the input and output circuits. To
minimize any common inductance in the ground return,
separate the input and output circuit ground returns as close
to the ICL7667 as is possible.
Bypassing
The rapid charging and discharging of the load capacitance
requires very high current spikes from the power supplies. A
parallel combination of capacitors that has a low impedance
over a wide frequency range should be used. A 4.7
F
tantalum capacitor in parallel with a low inductance 0.1
F
capacitor is usually sufficient bypassing.
Output Damping
Ringing is a common problem in any circuit with very fast
rise or fall times. Such ringing will be aggravated by long
inductive lines with capacitive loads. Techniques to reduce
ringing include:
1. Reduce inductance by making printed circuit board traces
as short as possible.
2. Reduce inductance by using a ground plane or by closely
coupling the output lines to their return paths.
3. Use a 10
to 30
resistor in series with the output of the
ICL7667. Although this reduces ringing, it will also slightly
increase the rise and fall times.
4. Use good bypassing techniques to prevent supply voltage
ringing.
Power Dissipation
The power dissipation of the ICL7667 has three main
components:
5. Input inverter current loss
6. Output stage crossover current loss
7. Output stage I
2
R power loss
The sum of the above must stay within the specified limits for
reliable operation.
As noted above, the input inverter current is input voltage
dependent, with an I
CC
of 0.1mA maximum with a logic 0
input and 6mA maximum with a logic 1 input.
The output stage crowbar current is the current that flows
through the series N-Channel and P-channel devices that
form the output. This current, about 300mA, occurs only
during output transitions. Caution: The inputs should never
be allowed to remain between V
IL
and V
IH
since this could
leave the output stage in a high current mode, rapidly
leading to destruction of the device. If only one of the drivers
is being used, be sure to tie the unused input to a ground.
NEVER leave an input floating. The average supply current
drawn by the output stage is frequency dependent, as can
be seen in I
CC
vs Frequency graph in the Typical
Characteristics Graphs.
The output stage I
2
R power dissipation is nothing more than
the product of the output current times the voltage drop
across the output device. In addition to the current drawn by
any resistive load, there will be an output current due to the
charging and discharging of the load capacitance. In most
high frequency circuits the current used to charge and
discharge capacitance dominates, and the power dissipation
is approximately
P
AC
= CV
CC
2
f
where C = Load Capacitance, f = Frequency
In cases where the load is a power MOSFET and the gate
drive requirement are described in terms of gate charge, the
ICL7667 power dissipation will be
P
AC
= Q
G
V
CC
f
where Q
G
= Charge required to switch the gate, in
Coulombs, f = Frequency.
Power MOS Driver Circuits
Power MOS Driver Requirements
Because it has a very high peak current output, the ICL7667
the at driving the gate of power MOS devices. The high
current output is important since it minimizes the time the
power MOS device is in the linear region. Figure 9 is a
typical curve of charge vs gate voltage for a power MOSFET.
The flat region is caused by the Miller capacitance, where
the drain-to-gate capacitance is multiplied by the voltage
gain of the FET. This increase in capacitance occurs while
the power MOSFET is in the linear region and is dissipating
significant amounts of power. The very high current output of
the ICL7667 is able to rapidly overcome this high
capacitance and quickly turns the MOSFET fully on or off.
ICL7667
3-6
Direct Drive of MOSFETs
Figure 11 shows interfaces between the ICL7667 and typical
switching regulator ICs. Note that unlike the DS0026, the
ICL7667 does not need a dropping resistor and speedup
capacitor between it and the regulator IC. The ICL7667, with
its high slew rate and high voltage drive can directly drive the
gate of the MOSFET. The SG1527 IC is the same as the
SG1525 IC, except that the outputs are inverted. This
inversion is needed since ICL7667 is an inverting buffer.
Transformer Coupled Drive of MOSFETs
Transformers are often used for isolation between the logic
and control section and the power section of a switching
regulator. The high output drive capability of the ICL7667
enables it to directly drive such transformers. Figure 11
shows a typical transformer coupled drive circuit. PWM ICs
with either active high or active low output can be used in
this circuit, since any inversion required can be obtained by
reversing the windings on the secondaries.
Buffered Drivers for Multiple MOSFETs
In very high power applications which use a group of
MOSFETs in parallel, the input capacitance may be very large
and it can be difficult to charge and discharge quickly. Figure
13 shows a circuit which works very well with very large
capacitance loads. When the input of the driver is zero, Q
1
is
held in conduction by the lower half of the ICL7667 and Q
2
is
clamped off by Q
1
. When the input goes positive, Q
1
is turned
off and a current pulse is applied to the gate of Q
2
by the
upper half of the ICL7667 through the transformer, T
1
. After
about 20ns, T
1
saturates and Q
2
is held on by its own C
GS
and the bootstrap circuit of C
1
, D
1
and R
1
. This bootstrap
circuit may not be needed at frequencies greater than 10kHz
since the input capacitance of Q
2
discharges slowly.
18
16
14
12
10
8
6
4
2
0
-2
0
2
4
6
8
10
12
14
16
18
20
I
D
= 1A
V
DD
= 50V
GATE CHARGE - Q
G
(NANO-COULOMBS)
GA
TE T
O
SOURCE V
O
L
T
A
G
E
680pF
630pF
212pF
V
DD
= 200V
V
DD
= 375V
FIGURE 9. MOSFET GATE DYNAMIC CHARACTERISTICS
FIGURE 10A.
FIGURE 10B.
FIGURE 10. DIRECT DRIVE OF MOSFET GATES
SG1527
+V
C
GND
B
A
ICL7667
+V
-V
15V
IRF730
IRF730
+165V
DC
TL494
+V
C
GND
C2
C1
ICL7667
+V
-V
15V
IRF730
IRF730
+165V
DC
E2
E1
+15V
1K
1K
V
OUT
ICL7667
3-7
FIGURE 11. TRANSFORMER COUPLED DRIVE CIRCUIT
FIGURE 12. VERY HIGH SPEED DRIVER
FIGURE 13A.
FIGURE 13B. OUTPUT CURRENT vs OUTPUT VOLTAGE
FIGURE 13. VOLTAGE INVERTER
CA1524
CB
EB
EA
ICL7667
+V
-V
18V
IRF730
CA
V
IN
470
470
1
F
1
F
IRF730
+165V
0V
-165V
V
OUT
0.1
F
+
4.7
F
1/2
1/2
0V - 5V
INPUT
FROM
PWM IC
2200pF
ICL7667
ICL7667
FF10
4.7
F
0.1
F
V+
IN914
D
1
R
1
10k
Q
2
IRFF120
1000pF
C
1
IRFF120
5FF10
Q
1
Z
L
1/2
ICL7667
+15V
10
F
+
-
IN4001
47
F
+
-
-13.5V
IN4001
1kHz - 250kHz
SQUARE
WAVE
IN TTL
LEVELS
5
20
40
60
80
100
-4
-6
-8
-10
-12
-14
V
OUT
(V)
I
OUT
(mA)
SLOPE = 60
f = 10kHz
ICL7667
3-8
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Other Applications
Relay and Lamp Drivers
The ICL7667 is suitable for converting low power TTL or
CMOS signals into high current, high voltage outputs for
relays, lamps and other loads. Unlike many other level
translator/driver ICs, the ICL7667 will both source and sink
current. The continuous output current is limited to 200mA
by the I
2
R power dissipation in the output FETs.
Charge Pump or Voltage Inverters and Doublers
The low output impedance and wide VCC range of the
ICL7667 make it well suited for charge pump circuits. Figure
13A shows a typical charge pump voltage inverter circuit and
a typical performance curve. A common use of this circuit is
to provide a low current negative supply for analog circuitry
or RS232 drivers. With an input voltage of +15V, this circuit
will deliver 20mA at -12.6V. By increasing the size of the
capacitors, the current capability can be increased and the
voltage loss decreased. The practical range of the input
frequency is 500Hz to 250kHz. As the frequency goes up,
the charge pump capacitors can be made smaller, but the
internal losses in the ICL7667 will rise, reducing the circuit
efficiency.
Figure 14, a voltage doubler, is very similar in both circuitry
and performance. A potential use of Figure 13 would be to
supply the higher voltage needed for EEPROM or EPROM
programming.
Clock Driver
Some microprocessors (such as the CDP68HC05 families)
use a clock signal to control the various LSI peripherals of
the family. The ICL7667s combination of low propagation
delay, high current drive capability and wide voltage swing
make it attractive for this application. Although the ICL7667
is primarily intended for driving power MOSFET gates at
15V, the ICL7667 also works well as a 5V high-speed buffer.
Unlike standard 4000 series CMOS, the ICL7667 uses short
channel length FETs and the ICL7667 is only slightly slower
at 5V than at 15V.
1/2
ICL7667
+15V
10
F
+
-
IN4001
47
F
+
-
28.5V
IN4001
1kHz - 250kHz
+15
SQUARE
WAVE
IN TTL
LEVELS
FIGURE 14. VOLTAGE DOUBLER
ICL7667
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