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LTM8040
36V, 1A μModule
LED Driver and Current Source
FEATURES
DESCRIPTION
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True Color PWM? Delivers Constant Color with
250:1 Dimming Ratio
Wide Input Range: 4V to 36V
Up to 1A LED Current
Adjustable Control of LED Current
High Output Current Accuracy is Maintained Over a
Wide Range from 35mA to 1A
Open LED and Short-Circuit Protection
Grounded LED Cathode Connection
Small Footprint (15mm × 9mm × 4.32mm)
The LTM ? 8040 is a ?xed frequency 1A step-down DC/DC
μModule ? regulator designed to operate as a constant cur-
rent 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 2.5V to 13V. Unique PWM circuitry allows a
dimming range of 250:1, avoiding the color shift normally
associated with LED current dimming.
Automotive and Avionic Lighting
Architectural Detail Lighting
Display Backlighting
Constant Current Sources
SurfaceMountLGAPackage
APPLICATIONS
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L , LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
1A μModule LED Driver
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,
compact (15mm × 9mm × 4.32mm) molded land grid
array (LGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8040 is
Pb-free and RoHS compliant.
Ef ?ciency
V IN *
11.5V TO 36V
1μF
V IN
SHDN
LEDA
LPWR
100
90
LTM8040
TWO WHITE LEDs
80
ADJ
PWM
BIAS
6V TO 9V
1A
70
60
215k
650kHz
RT
GND
50
40
30
*RUNNING VOLTAGE. SEE APPLICATION INFORMATION
FOR START-UP REQUIREMENTS
8040 TA01
20
10
V IN = 12V
TWO 3.3V AT 1A LEDs
OUTPUT CURRENT ADJUSTED
WITH ADJ VOLTAGE
0
0
200
400
600
800
1000
OUTPUT CURRENT (mA)
8040 TA01b
8040fa
1
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