TC4423AVMF datasheet(9/22 Pages) MICROCHIP

9 / 22 page

DS21998B-page 9

TC4423A/TC4424A/TC4425A

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE (1)

3.1

Inputs A and B

Inputs A and B are TTL/CMOS compatible inputs that

control outputs A and B, respectively. These inputs

have 300 mV of hysteresis between the high and low

input levels, allowing them to be driven from slow rising

and falling signals, and to provide noise immunity.

3.2

Outputs A and B

Outputs A and B are CMOS push-pull outputs that are

capable of sourcing and sinking 3A peaks of current

(VDD = 18V). The low output impedance ensures the

gate of the external MOSFET will stay in the intended

state even during large transients. These outputs also

have a reverse current latch-up rating of 1.5A.

3.3

Supply Input (VDD)

VDD is the bias supply input for the MOSFET driver and

has a voltage range of 4.5V to 18V. This input must be

decoupled to ground with a local ceramic capacitor.

This bypass capacitor provides a localized low-

impedance path for the peak currents that are to be

provided to the load.

3.4

Ground (GND)

Ground is the device return pin. The ground pin should

have a low-impedance connection to the bias supply

source return. High peak currents will flow out the

ground pin when the capacitive load is being

discharged.

3.5

Exposed Metal Pad

The exposed metal pad of the 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

8-Pin

DFN

16-Pin

SOIC

(Wide)

Symbol

Description

No connection

IN A

Input A

—

No connection

GND

Ground

—

GND

Ground

—

No connection

IN B

Input B

—

No connection

—

No connection

OUT B

Output B

—

OUT B

Output B

VDD

Supply input

——

VDD

Supply input

OUT A

Output A

—

OUT A

Output A

No connection

—

PAD

—

Exposed Metal Pad

Note 1: Duplicate pins must be connected for proper operation.

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