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Linear Technology - 1A Module LED Driver

Numéro de référence LTM8040
Description 1A Module LED Driver
Fabricant Linear Technology 
Logo Linear Technology 





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LTM8040 fiche technique
Electrical Specifications Subject to Change
LTM8040
36V, 1A µModule LED
Driver
FEATURESwww.datasheet4u.com
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
PWM
RT
GND
BIAS
*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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