ICL7667 Datasheet, PDF (4/8 Pages) Intersil Corporation – Dual Power MOSFET Driver

Typical Performance Curves (Continued)
ICL7667
100
V_CC = 15V
10
V_CC = 5V
1
100µA
10K
C_L = 1nF
100K
1M
10M
FREQUENCY (Hz)
FIGURE 5. I_CC vs FREQUENCY
50
40
30
t_f
20
10
0
5
t_D1
C_L = 1nF
10
15
V_CC (V)
FIGURE 7. DELAY AND FALL TIMES vs V_CC
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.
3-76
100
10
V_CC = 15V
1
V_CC = 5V
100mA
10k
C_L = 10pF
100k
1M
10M
FREQUENCY (Hz)
FIGURE 6. NO LOAD I_CC vs FREQUENCY
50
40
30
t_r = T_D2
20
10
C_L = 10pF
0
5
10
15
V_CC (V)
FIGURE 8. RISE TIME vs V_CC
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 1µA 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 7Ω. The high