TC4428AEPA datasheet(8/18 Pages) MICROCHIP

8 / 18 page

TC4426A/TC4427A/TC4428A

DS21423F-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

Inputs A and B

MOSFET driver inputs A and B are high-impedance,

TTL/CMOS compatible inputs. These inputs also have

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.

3.2

Ground (GND)

The ground pin is the return path for both the bias

current and the high peak current that discharges the

external load capacitance. The ground pin should be

tied into a ground plane or have a very short trace to the

bias supply source return.

3.3

Output A and B

MOSFET driver outputs A and B are low-impedance,

CMOS push-pull style outputs. The pull-down and pull-

up devices are of equal strength, making the rise and

fall times equivalent.

3.4

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 with local

ceramic capacitors. The value of these capacitors

should be chosen based on the capacitive load that is

being driven.

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, to aid in heat

removal from the package.

8-Pin PDIP/

MSOP/SOIC

8-Pin

DFN

Symbol

Description

No connection

IN A

Input A

GND

Ground

IN B

Input B

OUT B

Output B

VDD

Supply input

OUT A

Output A

No connection

—

PAD

Exposed Metal Pad

Note 1:

Duplicate pins must be connected for proper operation.

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