Datasheet LTM8040 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 36V, 1A μModule (Power Module) LED Driver and Current Source |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTION. True Color PWM™ Delivers Constant Color with. … |
| File Format / Size | PDF / 220 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. True Color PWM™ Delivers Constant Color with. 250:1 Dimming Ratio. Wide Input Range: 4V to 36V
Model Line for this Datasheet
Text Version of Document
LTM8040 36V, 1A µModule LED Driver and Current Source
FEATURES DESCRIPTION
n
True Color PWM™ Delivers Constant Color with
The LTM®8040 is a fi xed frequency 1A step-down DC/DC
250:1 Dimming Ratio
μModule® regulator designed to operate as a constant cur- n
Wide Input Range: 4V to 36V
rent source. Internal circuitry monitors the output current n
Up to 1A LED Current
to provide accurate current regulation, which is ideal for n
Adjustable Control of LED Current
driving high current LEDs. High output current accuracy n
High Output Current Accuracy is Maintained Over a
is maintained over a wide current range, from 35mA to
Wide Range from 35mA to 1A
1A, allowing a wide dimming range over an output volt- n Open LED and Short-Circuit Protection age range of 2.5V to 13V. Unique PWM circuitry allows a n Grounded LED Cathode Connection dimming range of 250:1, avoiding the color shift normally n Small Footprint (15mm × 9mm × 4.32mm) associated with LED current dimming. Surface Mount LGA Package With its wide input range of 4V to 36V, the LTM8040 regu-
APPLICATIONS
lates a broad array of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead n Automotive and Avionic Lighting acid batteries and distributed power supplies. n Architectural Detail Lighting The LTM8040 is packaged in a thermally enhanced, n Display Backlighting compact (15mm n × 9mm × 4.32mm) molded land grid Constant Current Sources array (LGA) package suitable for automated assembly 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 by standard surface mount equipment. The LTM8040 is Corporation. All other trademarks are the property of their respective owners. Pb-free and RoHS compliant.
TYPICAL APPLICATION 1A μModule LED Driver Effi ciency
VIN* V 100 IN LEDA 11.5V TO 36V SHDN LPWR 90 1μF LTM8040 80 TWO WHITE LEDs 6V TO 9V ADJ BIAS 70 1A PWM 60 RT GND 50 215k 650kHz 40 EFFICIENCY (%) 30 8040 TA01 VIN = 12V 20 TWO 3.3V AT 1A LEDs *RUNNING VOLTAGE. SEE APPLICATION INFORMATION OUTPUT CURRENT ADJUSTED FOR START-UP REQUIREMENTS 10 WITH ADJ VOLTAGE 0 0 200 400 600 800 1000 OUTPUT CURRENT (mA) 8040 TA01b 8040fa 1
FEATURES DESCRIPTION
n
True Color PWM™ Delivers Constant Color with
The LTM®8040 is a fi xed frequency 1A step-down DC/DC
250:1 Dimming Ratio
μModule® regulator designed to operate as a constant cur- n
Wide Input Range: 4V to 36V
rent source. Internal circuitry monitors the output current n
Up to 1A LED Current
to provide accurate current regulation, which is ideal for n
Adjustable Control of LED Current
driving high current LEDs. High output current accuracy n
High Output Current Accuracy is Maintained Over a
is maintained over a wide current range, from 35mA to
Wide Range from 35mA to 1A
1A, allowing a wide dimming range over an output volt- n Open LED and Short-Circuit Protection age range of 2.5V to 13V. Unique PWM circuitry allows a n Grounded LED Cathode Connection dimming range of 250:1, avoiding the color shift normally n Small Footprint (15mm × 9mm × 4.32mm) associated with LED current dimming. Surface Mount LGA Package With its wide input range of 4V to 36V, the LTM8040 regu-
APPLICATIONS
lates a broad array of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead n Automotive and Avionic Lighting acid batteries and distributed power supplies. n Architectural Detail Lighting The LTM8040 is packaged in a thermally enhanced, n Display Backlighting compact (15mm n × 9mm × 4.32mm) molded land grid Constant Current Sources array (LGA) package suitable for automated assembly 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 by standard surface mount equipment. The LTM8040 is Corporation. All other trademarks are the property of their respective owners. Pb-free and RoHS compliant.
TYPICAL APPLICATION 1A μModule LED Driver Effi ciency
VIN* V 100 IN LEDA 11.5V TO 36V SHDN LPWR 90 1μF LTM8040 80 TWO WHITE LEDs 6V TO 9V ADJ BIAS 70 1A PWM 60 RT GND 50 215k 650kHz 40 EFFICIENCY (%) 30 8040 TA01 VIN = 12V 20 TWO 3.3V AT 1A LEDs *RUNNING VOLTAGE. SEE APPLICATION INFORMATION OUTPUT CURRENT ADJUSTED FOR START-UP REQUIREMENTS 10 WITH ADJ VOLTAGE 0 0 200 400 600 800 1000 OUTPUT CURRENT (mA) 8040 TA01b 8040fa 1
