TC4431/TC4432

DS21424C-page 6

 2003 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

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

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

lock-out 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 dis-

abled when the bias voltage reaches 7.7V (typical) on

the falling edge), the lockout pin should be left floating.

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 3A peak currents into

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

peak currents from a capacitive load.

Pin No.

Symbol

Description

Supply Input, 4.5V to 30V

2

IN

TTL/CMOS Compatible Input

3

LOCK DIS

Input Pin, Enable/Disable for

UV Lockout

4

GND

Ground

5

GND

Ground

6

OUT

Drive Output, Pull Down

7

OUT

Drive Output, Pull Up

Supply Input, 4.5V to 30V