TC4451 datasheet(9/22 Pages) MICROCHIP

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DS21987A-page 9

TC4451/TC4452

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

pin. 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 also has

300 mV of hysteresis between the high and low

thresholds that prevents output glitching even when the

rise and fall time of the input signal is very slow.

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 12A 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 for 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.

3.5

Exposed Metal Pad

The exposed metal pad of the 6x5 DFN package is not

internally connected to any potential. Therefore, this

pad can be connected to a ground plane or other

copper plane on a Printed Circuit Board (PCB) to aid in

heat removal from the package.

3.6

Metal Tab

The metal tab of the TO-220 package is connected to

the VDD potential of the device. This connection to VDD

can be used as a current carrying path for the device.

Pin No.

8-Pin PDIP,

SOIC

Pin No.

8-Pin DFN

Pin No.

5-Pin TO-220

Symbol

Description

—

VDD

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

VDD

Supply input, 4.5V to 18V

—PAD

—

Exposed metal pad

——

TAB

VDD

Metal tab is at the VDD potential

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