News Release ⎜ www.linear.com 60VIN /80VOUT LED Driver with Internal PWM Generator MILPITAS, CA – June 20, 2013 – The LT3955, a DC/DC converter designed to operate as a constant-current source and constant-voltage regulator with an internal 3.5A switch, is now available from Linear Technology. The device’s internal PWM dimming generator makes it ideal for driving high current LEDs, and it also has features suitable for charging batteries and supercapacitors. The LT3955’s 4.5V to 60V input voltage range suits a wide variety of applications, including automotive, industrial and architectural lighting. The LT3955 uses an internal 3.5A, 80V N-channel MOSFET and can drive up to twelve 300mA white LEDs from a nominal 12V input, delivering in excess of 20 watts. It incorporates a high-side current sense, enabling use in boost mode, buck mode, buck-boost mode or SEPIC topologies. The LT3955 can deliver efficiencies of over 94% in the boost topology, eliminating the need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size and cost. Combined with a 5mm x 6mm QFN package, the LT3955 offers a highly compact high power LED driver solution. The LT3955 has an internal PWM generator that delivers dimming ratios as high as 25:1 or it can utilize an external PWM signal, delivering dimming ratios of up to 3,000:1. For less demanding dimming requirements, the CTRL pin can be used to provide a 10:1 analog dimming range. Its fixed frequency, current-mode architecture offers stable operation over a wide range of supply and output voltages. Output short-circuit protection and open LED protection enhance 60VIN /80VOUT LED Driver with Internal PWM Generator page 2 system reliability. The LT3955’s ground-referenced voltage FB pin serves as the input for several LED protection features and makes it possible for the converter to operate as a constantvoltage source for charging applications. The LT3955EUHE is available in a 36-lead 5mm x 6mm QFN package. Pricing starts at $3.75 each. An extended temperature version, or I grade, the LT3955IUHE, is also available, priced starting at $4.41 each. All pricing is based on 1,000-piece quantities and both versions are available from stock. For more information, visit www.linear.com/product/LT3955 Photo Caption: 80V Constant-Current/Constant-Voltage Regulator Summary of Features: LT3955 • • • • • • • • • • • • • • • 3000:1 True Color PWM™ Dimming for LEDs Wide VIN Range: 4.5V to 60V Rail-to-Rail Current Sense Range: 0V to 80V Internal 80V/3.5A Switch Programmable PWM Dimming Signal Generator Constant Current (±3%) and Constant-Voltage (±2%) Regulation Accurate Analog Dimming Drives LEDs in Boost, SEPIC, CUK, Buck Mode, Buck-Boost Mode, or Flyback Configuration Output Short-Circuit Protected Boost Open LED Protection and Reporting Adjustable Switching Frequency: 100kHz to 1MHz Programmable VIN UVLO with Hysteresis C/10 Indication for Battery Chargers Low Shutdown Current: <1μA Thermally Enhanced 5mm × 6mm QFN-36 Package 60VIN /80VOUT LED Driver with Internal PWM Generator page 3 About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule®subsystems, and wireless sensor network products. For more information, visit www.linear.com , LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and True Color PWM is also a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners. Press Contacts: North America / Worldwide UK & Nordic John Hamburger, Director Marketing Communications [email protected] Tel: 408-432-1900 ext 2419 Alan Timmins [email protected] Tel: +44-1-252-629937 Doug Dickinson, Media Relations Manager [email protected] Tel: 408-432-1900 ext 2233