LM3481

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SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012

ABSOLUTE MAXIMUM RATINGS

(1)

-0.4V to 50V

FB Pin Voltage

-0.4V to 6V

FA/SYNC/SD Pin Voltage

-0.4V to 6V

COMP Pin Voltage

-0.4V to 6V

UVLO Pin Voltage

-0.4V to 6V

-0.4V to 6V

DR Pin Voltage

-0.4V to 6V

–0.4V to 600 mV

Peak Driver Output Current

1.0A

Power Dissipation

Internally Limited

Storage Temperature Range

−65°C to +150°C

Junction Temperature

+150°C

ESD Susceptibility

2 kV

Lead Temperature

DGS Package

Vapor Phase (60 sec.)

215°C

Infared (15 sec.)

220°C

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Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicates conditions for which

the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test

conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions.

(2)

The human body model is a 100 pF capacitor discharged through a 1.5k

Ω resistor into each pin.

RECOMMENDED OPERATING CONDITIONS

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Supply Voltage

2.97V to 48V

Junction Temperature Range

−40°C to +125°C

Switching Frequency Range

100 kHz to 1 MHz

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicates conditions for which

the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test

conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions.

ELECTRICAL CHARACTERISTICS

Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.

(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Feedback Voltage

1.256

1.275

1.294

V

Feedback Voltage Line Regulation

2.97

0.003

%/V

Output Voltage Load Regulation

±0.5

%/A

Undervoltage Lockout Reference

1.345

1.430

1.517

V

Voltage

UVLO Source Current

Enabled

3

5

6

µA

UVLO Shutdown Voltage

0.7

V

COMP pin Current Sink

640

µA

1

V

Nominal Switching Frequency

406

475

550

kHz

Threshold for Synchronization on

Synchronization Voltage Rising

1.4

V

FA/SYNC/SD pin

Threshold for Synchronization on

Synchronization Voltage Falling

0.7

V

FA/SYNC/SD pin

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All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room

temperature limits are 100% tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality

Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(2)

Typical numbers are at 25°C and represent the most likely norm.

Copyright © 2007–2012, Texas Instruments Incorporated

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