LTC4441 Просмотр технического описания (PDF) - Linear Technology

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LTC4441

N-Channel MOSFET Gate Driver

Linear Technology 

LTC4441/LTC4441-1

Pin Functions (MSOP/SO-8)

PGND (Pin 1/Pin 1): Driver Ground. Connect the DRVCC

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

DRVCC regulator and low power circuitry.

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

driver input under normal operating conditions.

*Available only on the 10-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/LTC4441-1

into shutdown mode; the DRVCC regulator turns off and

the supply current drops below 12μA.

FB (Pin 7/Pin 5): DRVCC Regulator Feedback Input. Connect

this pin to the center tap of an external resistive divider

between DRVCC and SGND to program the DRVCC regulator

output voltage. To ensure loop stability, use the value of

330kΩ for the top resistor, R1.

VIN (Pin 8/Pin 6): Main Supply Input. This pin powers the

DRVCC linear regulator. Bypass this pin to SGND with a

1μF ceramic, tantalum or other low ESR capacitor in close

proximity to the LTC4441/LTC4441-1.

DRVCC (Pin 9/Pin 7): Linear Regulator Output. This output

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.

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

must be soldered to the PCB ground.

44411fa

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