Intersil ICL7667MJA Dual power mosfet driver Datasheet

ICL7667
Data Sheet
April 1999
Dual Power MOSFET Driver
Features
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 switchedmode 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.
• Fast Rise and Fall Times
- 30ns with 1000pF Load
• Low Power Consumption
- 4mW with Inputs Low
- 20mW with Inputs High
Ordering Information
Applications
PART
NUMBER
File Number
2853.3
• Wide Supply Voltage Range
- VCC = 4.5V to 15V
• TTL/CMOS Input Compatible Power Driver
- ROUT = 7Ω Typ
• Direct Interface with Common PWM Control ICs
• Pin Equivalent to DS0026/DS0056; TSC426
• Switching Power Supplies
TEMP. RANGE
(oC)
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
• DC/DC Converters
• Motor Controllers
Pinouts
ICL7667 (CAN)
TOP VIEW
V+
8
F8.3A
OUT A
NOTE:
1
7 OUT B
N/C 2
6
N/C
1. Add /883B to Part Number for 883B Processing
IN A
Functional Diagram
5
3
IN B
4
V-
VCC
ICL7667 (PDIP, SOIC, CERDIP)
TOP VIEW
≈ 2mA
OUT
IN
1
8
N/C
IN A 2
7
OUT A
3
6
V+
IN B 4
5
OUT B
N/C
V-
3-73
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
ICL7667
Absolute Maximum Ratings
Thermal Information
Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . V- -0.3V to V+ +0.3V
Package Dissipation, TA 25oC . . . . . . . . . . . . . . . . . . . . . . . .500mW
Thermal Resistance (Typical, Note 2)
θJA (oC/W) θJC(oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
150
N/A
SOIC Package . . . . . . . . . . . . . . . . . . .
170
N/A
Metal Can Package . . . . . . . . . . . . . . .
156
68
CERDIP Package. . . . . . . . . . . . . . . . .
115
30
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
Operating Temperature Range
ICL7667C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
ICL7667M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
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. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER
SYMBOL
TEST CONDITIONS
ICL7667C, M
ICL7667M
TA = 25oC
-55oC ≤ TA ≤ 125oC
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
DC SPECIFICATIONS
Logic 1 Input Voltage
VIH
VCC = 4.5V
2.0
-
-
2.0
-
-
V
Logic 1 Input Voltage
VIH
VCC = 15V
2.0
-
-
2.0
-
-
V
Logic 0 Input Voltage
VIL
VCC = 4.5V
-
-
0.8
-
-
0.5
V
Logic 0 Input Voltage
VIL
VCC = 15V
-
-
0.8
-
-
0.5
V
Input Current
IIL
VCC = 15V, VIN = 0V and 15V
-0.1
-
0.1
-0.1
-
0.1
µA
Output Voltage High
VOH
VCC = 4.5V and 15V
VCC
-0.05
VCC
-
VCC
-0.1
VCC
-
V
Output Voltage Low
VOL
VCC = 4.5V and 15V
-
0
0.05
-
-
0.1
V
Output Resistance
ROUT
VIN = VIL, IOUT = -10mA, VCC = 15V
-
7
10
-
-
12
Ω
Output Resistance
ROUT
VIN = VIH, IOUT = 10mA, VCC = 15V
-
8
12
-
-
13
Ω
Power Supply Current
ICC
VCC = 15V, VIN = 3V both inputs
-
5
7
-
-
8
mA
Power Supply Current
ICC
VCC = 15V, VIN = 0V both inputs
-
150
400
-
-
400
µA
SWITCHING SPECIFICATIONS
Delay Time
TD2
Figure 3
-
35
50
-
-
60
ns
Rise Time
TR
Figure 3
-
20
30
-
-
40
ns
Fall Time
TF
Figure 3
-
20
30
-
-
40
ns
TD1
Figure 3
-
20
30
-
-
40
ns
Delay Time
NOTE: All typical values have been characterized but are not tested.
3-74
ICL7667
Test Circuits
V- = 15V
+5V
90%
+
4.7µF
INPUT
0.1µF
10%
≈0.4V
INPUT
TD1
OUTPUT
CL = 1000pF
ICL7667
TD2
tr
tf
15V
90%
90%
INPUT RISE AND
FALL TIMES ≤10ns
OUTPUT
10%
10%
0V
Typical Performance Curves
1µs
100
VCC = 15V
CL = 1nF
VCC = 15V
90
TD1 AND TD2, (ns)
80
tr AND tf , (ns)
100
tRISE
10
70
60
TD2
50
40
TD1
30
20
tFALL
10
1
0
10
100
1000
10K
100K
-55
0
CL (pF)
FIGURE 1. RISE AND FALL TIMES vs CL
25
70
TEMPERATURE (oC)
125
FIGURE 2. TD1, TD2 vs TEMPERATURE
30
50
VCC = 15V
200kHz
tr AND tf
10
30
ICC (mA)
tr AND tf , (ns)
40
CL = 1nF
VCC = 15V
20
20kHz
3.0
10
0
-55
0
25
70
TEMPERATURE (oC)
FIGURE 3. tr, tf vs TEMPERATURE
3-75
125
1
10
100
1K
CL (pF)
FIGURE 4. ICC vs CL
10K
100K
ICL7667
Typical Performance Curves (Continued)
100
VCC = 15V
ICC (mA)
ICC (mA)
100
10
VCC = 15V
10
VCC = 5V
1
1
VCC = 5V
CL = 1nF
100µA
10K
100K
1M
10M
CL = 10pF
100mA
10k
100k
FREQUENCY (Hz)
FIGURE 6. NO LOAD ICC vs FREQUENCY
50
50
40
40
tr AND tD2 , (ns)
tD1 AND tf , (ns)
FIGURE 5. ICC vs FREQUENCY
30
tf
20
tD1
30
tr = TD2
20
10
10
CL = 10pF
CL = 1nF
0
5
10M
1M
FREQUENCY (Hz)
0
10
VCC (V)
15
5
FIGURE 7. DELAY AND FALL TIMES vs VCC
10
VCC (V)
15
FIGURE 8. RISE TIME vs VCC
Detailed Description
Input Stage
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 VCC without
any external parts or extra power supplies as required by the
DS0026/56 family. Although most specifications are at VCC =
15V, the propagation delays and specifications are almost
independent of VCC .
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 VCC range. Being CMOS, the inputs draw
less than 1µA of current over the entire input voltage range
of ground to VCC. 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.
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.
3-76
Output Stage
The ICL7667 output is a high-power CMOS inverter,
swinging between ground and VCC. At VCC = 15V, the
output impedance of the inverter is typically 7Ω. The high
ICL7667
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 VCC 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 1µs.
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
7. Output stage I2R 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 ICC 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 VIL and VIH 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 ICC vs Frequency graph in the Typical
Characteristics Graphs.
The output stage I2R 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
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 4.7µF
tantalum capacitor in parallel with a low inductance 0.1µF
capacitor is usually sufficient bypassing.
PAC = CVCC2f
Output Damping
PAC = QGVCCf
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:
where QG = Charge required to switch the gate, in
Coulombs, f = Frequency.
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 10Ω to 30Ω 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
3-77
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
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
Transformer Coupled Drive of MOSFETs
18
GATE TO SOURCE VOLTAGE
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.
ID = 1A
16
14
VDD = 50V
12
10
VDD = 375V
680pF
8
6
VDD = 200V
4
630pF
2
Buffered Drivers for Multiple MOSFETs
212pF
0
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, Q1 is
held in conduction by the lower half of the ICL7667 and Q2 is
clamped off by Q1. When the input goes positive, Q1 is turned
off and a current pulse is applied to the gate of Q2 by the
upper half of the ICL7667 through the transformer, T1. After
about 20ns, T1 saturates and Q2 is held on by its own CGS
and the bootstrap circuit of C1, D1 and R1. This bootstrap
circuit may not be needed at frequencies greater than 10kHz
since the input capacitance of Q2 discharges slowly.
-2
0
2
4
6
8
10
12
14
16
18
GATE CHARGE - QG (NANO-COULOMBS)
20
FIGURE 9. MOSFET GATE DYNAMIC CHARACTERISTICS
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.
15V
+165VDC
IRF730
+V
+VC
A
ICL7667
SG1527
IRF730
B
GND
-V
FIGURE 10A.
15V
+165VDC
1K
+VC
+V
IRF730
VOUT
C1
E1
ICL7667
TL494
IRF730
C2
E2
GND
1K
-V
+15V
FIGURE 10B.
FIGURE 10. DIRECT DRIVE OF MOSFET GATES
3-78
ICL7667
18V
CA
CB
VIN
+V
+165V
1µF
IRF730
EA
0V
470
ICL7667
CA1524
1µF
IRF730
EB
-165V
470
-V
VOUT
FIGURE 11. TRANSFORMER COUPLED DRIVE CIRCUIT
V+
0.1µF
0.1µF
4.7µF
IN914
D1
+
4.7µF
R1
10k
1000pF
C1
Q2
1/2
ICL7667
0V - 5V
INPUT
FROM
PWM IC
2200pF
FF10
IRFF120
5FF10
ZL
1/2
ICL7667
IRFF120
Q1
FIGURE 12. VERY HIGH SPEED DRIVER
-4
f = 10kHz
-6
VOUT (V)
-8
+15V
SLOPE = 60Ω
-10
-12
1kHz - 250kHz
SQUARE
WAVE
IN TTL
LEVELS
+
1/2
ICL7667
-
IN4001
-13.5V
-14
10µF
IN4001
47µF
+
5
20
40
60
80
100
IOUT (mA)
FIGURE 13A.
3-79
FIGURE 13B. OUTPUT CURRENT vs OUTPUT VOLTAGE
FIGURE 13. VOLTAGE INVERTER
ICL7667
Other Applications
Clock Driver
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 I2R 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.
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.
+15
+15V
1kHz - 250kHz
SQUARE
WAVE
IN TTL
LEVELS
IN4001
+
1/2
ICL7667
-
10µF
28.5V
IN4001
+
47µF
FIGURE 14. VOLTAGE DOUBLER
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.
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