LTC4441/LTC4441-1

44411f

6

PI FU CTIO S

bypass capacitor directly to this pin, as close as possible

to the IC. In addition, connect the PGND and SGND pins

together close to the IC, and then connect this node to the

source of the power MOSFET (or current sense resistor)

with as short and wide a PCB trace as possible.

BLANK (Pin 2/NA): Current Sense Blanking Output. Use

this pin to assert a blanking time in the power MOSFET’s

source current sense signal. The LTC4441 pulls this

open-drain output to SGND if the driver output is low. The

output becomes high impedance after a programmable

blanking time from the driver leading edge output. This

blanking time can be adjusted with the RBLANK pin.*

RBLANK (Pin 3/NA): Blanking Time Adjust Input. Connect

a resistor from this pin to SGND to set the blanking time.

A small resistor value gives a shorter delay. Leave this pin

floating if the BLANK pin is not used.*

SGND (Pin 4/Pin 2): Signal Ground. Ground return for the

IN (Pin 5/Pin 3): Driver Logic Input. This is the non-

inverting driver input under normal operating conditions.

*Available only on the lo-lead version of the LTC4441.

EN/SHDN (Pin 6/Pin 4): Enable/Shutdown Input. Pulling

this pin above 1.21V allows the driver to switch. Pulling

this pin below 1.09V forces the driver output to go

low. Pulling this pin below 0.45V forces the LTC4441/

turns off and the supply current drops below 12µA.

nect this pin to the center tap of an external resistive

regulator output voltage. To ensure loop stability, use the

value of 330kΩ for the top resistor, R1.

ceramic, tantalum or other low ESR capacitor in close

proximity to the LTC4441/LTC4441-1.

pin powers the driver and the control circuitry. Bypass this

pin to PGND using a 10µF ceramic, low ESR (X5R or X7R)

capacitor in close proximity to the LTC4441/LTC4441-1.

OUT (Pin 10/Pin 8): Driver Output.

Exposed Pad (Pin 11/NA): Ground. The Exposed Pad

must be soldered to the PCB ground.

TYPICAL PERFOR A CE CHARACTERISTICS

0

300

100 200

400 500 600 700

900

800

1000

4441 G21

50

45

20

15

5

10

0

40

35

30

25

015

5

10

20253035

45

40

50

4441 G22

60

50

20

10

0

40

30

MSOP/SO-8