LTM8040 Просмотр технического описания (PDF) - Linear Technology

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LTM8040

36V, 1A µModule LED Driver

Linear Technology 

Electrical Specifications Subject to Change

LTM8040

36V, 1A µModule LED

Driver

FEATURES

n True Color PWM™ Delivers Constant Color with

400:1 Dimming Ratio

n Wide Input Range: 4V to 36V

n Up to 1A LED Current

n Adjustable Control of LED Current

n High Output Current Accuracy is Maintained Over a

Wide Range from 35mA to 1A

n Open LED and Short-Circuit Protection

n Grounded Cathode Connection

n Small Footprint, Low Profile (15mm × 9mm × 2.82mm)

Surface Mount LGA Package

APPLICATIONS

n Automotive and Avionic Lighting

n Architectural Detail Lighting

n Display Backlighting

n Constant Current Sources

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

μModule is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

DESCRIPTION

The LTM®8040 is a fixed frequency 1A step-down DC/DC

μModule™ designed to operate as a constant current

source. Internal circuitry monitors the output current to

provide accurate current regulation, which is ideal for

driving high current LEDs. High output current accuracy

is maintained over a wide current range, from 35mA to

1A, allowing a wide dimming range over an output volt-

age range of 2.4V to 13V. Unique PWM circuitry allows a

dimming range of 400:1, avoiding the color shift normally

associated with LED current dimming.

With its wide input range of 4V to 36V, the LTM8040 regu-

lates a broad array of power sources, from 4-cell batteries

and 5V logic rails to unregulated wall transformers, lead

acid batteries and distributed power supplies.

The LTM8040 is packaged in a thermally enhanced, com-

pact (15mm × 9mm) and low profile (2.82mm) molded

Land Grid Array (LGA) package suitable for automated

assembly by standard surface mount equipment. The

LTM8040 is Pb-free and RoHS compliant.

TYPICAL APPLICATION

1A LED Driver μModule

VIN*

4V TO 36V

1μF

215k

650kHz

VIN

SHDN

LEDA

LPWR

LTM8040

ADJ

BIAS

PWM

RT

GND

*RUNNING VOLTAGE. SEE APPLICATION INFORMATION

FOR START-UP REQUIREMENTS

TWO WHITE LEDs

6V TO 9V

1A

8040 TA01

Efficiency

100

90

80

70

60

50

40

30

20

10 VIN = 12V

3.3V AT 1A LEDs

0

0

200 400 600 800

OUTPUT CURRENT (mA)

1000

8040 TA01b

8040p

1

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