LTM8040: 0A to 1A uModule LED Driver & Current Source Integrates All Circuitry & Protects LEDs

February 18, 2009 - Linear Technology Corporation introduces the LTM8040, the first of a new family of DC/DC uModuleTM LED drivers that contains all the circuitry, including the inductor, in a compact 9mm x 15mm x 4.32mm surface mount package. Driving An LED string with the LTM8040 is as simple as adding the input capacitor and connecting the LED string. The LTM8040 can drive from 0A to 1A through a string of LEDs with ±2% accuracy at full load current. The device protects against an accidental open The LEDs with their output voltage clamp circuitry and against short-circuit incidents with a frequency foldback scheme. The LTM8040 has applications in 2-cell Li-Ion battery packs, rectified 12VAC and industrial 24V for LCD backlighting, portable lighting, and wide area lighting .

The LTM8040 can convert an input voltage range of 4V to 36V to a lower voltage ranging from 2.5V to 13V, suitable for driving a wide variety of color and white LEDs with different voltage-drops (VD). The device also features both analog and True Color PWMTM dimming, allowing a 400:1 constant color dimming range. The LED current amplitude can be linearly controlled from 0A to 1A with a single resistor. The default switching frequency is 500kHz, which can be adjusted with a resistor for up to 2MHz operation.

The LTM8040 is housed in a 9mm x 15mm x 4.32mm land grid array (LGA) package and is offered in two temperature grades of 0oC to 125oC and -40oC to 125oC (internal package temperature). 1,000-piece pricing starts at $¬7.45 For more information, visit .
Typical application circuit for LTM8040 Features:
• True Color PWM Delivers Constant Color with 400:1 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 Cathode Connection
• Small Footprint, Low Prole (15mm × 9mm × 2.82mm) Surface Mount LGA Package Applications:
• Automotive and Avionic Lighting
• Architectural Detail Lighting
• Display Backlighting
• Constant Current Sources About Linear Technology Corp:
Linear technology Corporation designs, manufactures and markets a broad line of standard high performance integrated circuits. Applications for the Companys products include telecommunications, cellular telephones, networking products, notebook and desktop computers, video/multimedia, industrial instrumentation, automotive electronics, factory automation, Process control, and military and space systems. The Companys principal product categories include amplifiers, battery management, data converters, high frequency, interface, voltage regulators and voltage references.

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