TC4420M/TC4429M
DS21933B-page 8 2005-2012 Microchip Technology Inc.
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Tabl e 3 -1.
3.1 Supply Input (V
DD
)
The V
DD
input is the bias supply for the MOSFET driver
and is rated for 4.5V to 18V with respect to the ground
pins. The V
DD
input should be bypassed to ground with
a local ceramic capacitor. The value of the capacitor
should be chosen based on the capacitive load that is
being driven. A minimum value of 1.0 µF is suggested.
3.2 Control Input
The MOSFET driver input is a high-impedance,
TTL/CMOS-compatible input. The input circuitry of the
TC4420M/TC4429M MOSFET driver also has a
“speed-up” capacitor. This helps to decrease the prop-
agation delay times of the driver. Because of this, input
signals with slow rising or falling edges should not be
used, as this can result in double-pulsing of the
MOSFET driver output.
3.3 CMOS Push-Pull Output
The MOSFET driver output is a low-impedance,
CMOS, push-pull style output capable of driving a
capacitive load with 6.0A peak currents. The MOSFET
driver output is capable of withstanding 1.5A peak
reverse currents of either polarity.
3.4 Ground
The ground pins are the return path for the bias current
and the high peak currents that discharge the load
capacitor. The ground pins should be tied into a ground
plane or have very short traces to the bias supply
source return.
TABLE 3-1: PIN FUNCTION TABLE
Pin No.
8-Pin CERDIP
Symbol Description
1V
DD
Supply input, 4.5V to 18V
2 INPUT Control input, TTL/CMOS compatible input
3 NC No Connection
4 GND Ground
5 GND Ground
6 OUTPUT CMOS push-pull output
7 OUTPUT CMOS push-pull output
8V
DD
Supply input, 4.5V to 18V
