A3

B3

C3

D3

A2

B2

C2

D2

A1

B1

C1

D1

A1

B1

C1

D1

A2

B2

C2

D2

A3

B3

C3

D3

TOP VIEW

(BUMPS FACE DOWN)

BOTTOM VIEW

(BUMPS FACE UP)

TOP MARKING

Note: The actual physical placement of the package marking will vary from part to part. The package

PDUNLQJ ³+<´ designates the date code. ³77´ LV D 16& LQWHUQDO FRGH IRU GLH WUDFHDELOLW\. Both will vary

considerably.

³3555´ LGHQWLILHV WKH GHYLFH (part number, option, etc.).

L1

LM3555

7.0 mm

LM3555

2.2 µH

10 µF

10 µF

IND

PGND

VLED

SW

TORCH

STROBE

I2C/EN

SCL/EN1

SDA/EN2

SGND

LM3555

SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011

www.ti.com

Typical Application Circuits

Connection Diagram

Pin Functions

Pin Descriptions

Signal

Input / Output

Pin Position

Description

Name

(I/O)

A1

PGND

Power ground.

A2

SGND

Signal ground.

2

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