1

4

3

2

10

7

8

9

NC

GATE

NC

COFF

NC

NC

5

6

FILTER

GND

3

2

1

6

7

8

VCC

NC

NC

GND

COFF

FILTER

4

5

GATE

LM3444

SNVS682C – NOVEMBER 2010 – REVISED MAY 2013

www.ti.com

Connection Diagrams

Figure 1. 10-Pin VSSOP (Top View)

Figure 2. 8-Lead SOIC (Top View)

See DGS Package

See D Package

PIN DESCRIPTIONS

VSSOP

SOIC

Name

Description

1

1

NC

No internal connection. Leave this pin open.

2

NC

No internal connection. Leave this pin open.

3

NC

No internal connection. Leave this pin open.

4

8

COFF

OFF time setting pin. A user set current and capacitor connected from the output to this pin sets the

constant OFF time of the switching controller.

5

2

FILTER

Filter input. A low pass filter tied to this pin can filter a PWM dimming signal to supply a DC voltage to

control the LED current. Can also be used as an analog dimming input. If not used for dimming connect a

0.1µF capacitor from this pin to ground.

6

3

GND

Circuit ground connection.

7

4

ISNS

LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the

maximum LED current.

8

5

GATE

Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the

buck controller.

9

6

Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.

10

7

NC

No internal connection. Leave this pin open.

2

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