TC4432 datasheet(6/18 Pages) MICROCHIP

6 / 18 page

TC4431/TC4432

DS21424D-page 6

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 input for the MOSFET

driver and is rated for 4.5V to 30V with respect to the

ground pins. The VDD input should be bypassed to

ground with a local ceramic capacitor. The value of this

capacitor should be chosen based on the capacitive

load that is being driven.

3.2

Control Input (IN)

The MOSFET driver input is a TTL/CMOS compatible

input with 250 mV of hysteresis between the high and

low threshold voltages. If an input signal level of greater

than 12V is applied to the device, a series current

limiting resistor is recommended.

3.3

Lockout Disable (LOCK DIS)

The lockout pin enables/disables the undervoltage

lockout feature of the device. If undervoltage lockout is

desired (output is not enabled until the bias voltage

reaches 8.4V (typical) on the rising edge and is

disabled when the bias voltage reaches 7.7V (typical)

on the falling edge), the lockout pin should be left float-

ing. If operation below 7V is desired, the lockout pin

should be tied to ground.

3.4

Ground (GND)

The ground pins are the return path for the bias current

and for the high peak currents which discharge the load

capacitor. Both ground pins should be used to ensure

proper operation. The ground pins should be tied into a

ground plane or have short traces to the bias supply

source return.

3.5

Drive Output (OUT)

The TC4431/TC4432 devices have individual source

and sink output pins. This feature can be used to adjust

the rise and fall time independently by adding separate

charge and discharge resistors external to the device.

Pin 7 (source output) can source 3 A peak currents into

capacitive loads and pin 6 (sink output) can sink 1.5 A

peak currents from a capacitive load.

Pin No.

Symbol

Description

1VDD

Supply Input, 4.5V to 30V

TTL/CMOS Compatible Input

LOCK DIS

Input Pin, Enable/Disable for UV Lockout

GND

Ground

GND

Ground

OUT

Drive Output, Pull Down

OUT

Drive Output, Pull Up

8VDD

Supply Input, 4.5V to 30V

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