TC4420M datasheet(8/18 Pages) MICROCHIP

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TC4420M/TC4429M

DS21933A-page 8

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Supply Input (VDD)

The VDD input is the bias supply for the MOSFET driver

and is rated for 4.5V to 18V with respect to the ground

pins. The VDD 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

propagation 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.

Pin No.

8-Pin CERDIP

Symbol

Description

1VDD

Supply input, 4.5V to 18V

INPUT

Control input, TTL/CMOS compatible input

No Connection

GND

Ground

GND

Ground

OUTPUT

CMOS push-pull output

OUTPUT

CMOS push-pull output

8VDD

Supply input, 4.5V to 18V

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