LTC4442/LTC4442-1

6

4442fa

BLOCK DIAGRAM

PIN FUNCTIONS

TG (Pin 1): High Side Gate Driver Output (Top Gate). This

pin swings between TS and BOOST.

TS (Pin 2): High Side MOSFET Source Connection (Top

Source).

BG (Pin 3): Low Side Gate Driver Output (Bottom Gate).

GND (Pin 4): Chip Ground.

IN (Pin 5): Input Signal. Input referenced to an internal

(Pin 4). If this pin is floating, an internal resistive divider

triggers a shutdown mode in which both BG (Pin 3) and

TG (Pin 1) are pulled low. Trace capacitance on this pin

should be minimized to keep the shutdown time low.

buffer and logic. Connect this pin to the power supply

of the controller that is driving IN (Pin 5) to match input

low side gate driver output directly and the high side

gate driver output through an external diode connected

between this pin and BOOST (Pin 8). A low ESR ceramic

bypass capacitor should be tied between this pin and

GND (Pin 4).

BOOST (Pin 8): High Side Bootstrapped Supply. An ex-

ternal capacitor should be tied between this pin and TS

(Pin 2). Normally, a bootstrap diode is connected between

age drop of the bootstrap diode.

Exposed Pad (Pin 9): Ground. Must be electrically con-

nected to GND (Pin 4) and soldered to PCB ground for

optimal thermal performance.

8

1

2

SHOOT-

THROUGH

PROTECTION

THREE-STATE

INPUT

BUFFER

LEVEL

SHIFTER

INTERNAL

SUPPLY

UNDERVOLTAGE

LOCKOUT

UNDERVOLTAGE

LOCKOUT

BOOST

TG

TS

3

6

BG

4442 BD

7k

7k

7

5

IN

4

GND

9

GND