Top View

Bottom View

Die-Attach

Pad(DAP)

GND

11

10

9

12

13

8

14

4

5

6

3

2

7

1

Die-Attach

Pad(DAP)

GND

11

10

9

12

13

8

14

4

5

6

3

2

7

1

LM3551, LM3552

SNVS371C – AUGUST 2005 – REVISED MARCH 2011

www.ti.com

Connection Diagram

14-Pin WSON Package

Figure 1. Package Number NHL0014B

PIN DESCRIPTIONS

Pin

Name

Function

9

Input Voltage. Input range: 2.7V to 5.5V.

13

T/F

TORCH/FLASH Pin. Low = Torch Mode, High = Flash Mode

8

SW

Switch Pin

10

OVP

Over Voltage Protection Pin

3

Compensation network connection. Connected to the output of the voltage error amplifier.

SD(LM3551)

Shutdown pin logic input. High = Shutdown, Low = Enabled

5

EN(LM3552)

Enable pin logic input. High = Enabled, Low = Shutdown

12

FTO

Flash Timeout. External capacitor determines max. duration allowed flash pulse

11

SS

Soft Start Pin

4

FB

Feedback Pin

14

FET-T

Torch FET Drain

2

FET-F

Flash FET Drain

1,7,DAP

GND

Ground

6

AGND

AGND. AGND must be connected to the GND pin through a low impedance connection.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

2

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