LINEAR TECHNOLOGY CORPORATION
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MILPITAS, CA April 13, 2015 The LT3952 is a current mode stepup DC/DC converter with an internal 60V, 4A DMOS power switch. It is specifically designed to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source. The LT3952's 3V to 42V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting.
The LT3952 can drive up to sixteen 350mA white LEDs from a nominal 12V input, delivering in excess of 15 watts. It incorporates a high side current sense, enabling its use in boost mode, buck mode, buckboost mode or SEPIC topologies. Internal spread spectrum frequency modulation minimizes EMI concerns. The LT3952 delivers efficiencies of over 94% in the boost topology, eliminating the need for external heat sinking, and internal LED short circuit protection enables added reliability required in most applications. A frequency adjust pin permits the user to program the switching frequency between 200kHz and 3MHz, optimizing efficiency while minimizing external component size and cost. The LT3952 delivers over 90% efficiency while switching at 2MHz in a tiny solution footprint. The LT3952 provides a very compact high power LED driver solution in a thermally enhanced TSSOP28E package.
The LT3952 has a gate driver for a PMOS LED disconnect switch, delivering dimming ratios of up to 4,000:1 using an external PWM signal. For less demanding dimming requirements, the CTRL pin can be used to offer a 10:1 analog dimming range and an internal PWM generator can be used for 5:1 dimming. The LT3952's fixed frequency, currentmode architecture offers stable operation over a wide range of supply and output voltages. Output short circuit protection and open LED protection enhance system reliability. Other features include frequency
synchronization, spread spectrum frequency modulation, programmable VIN undervoltage and overvoltage protection, and an input current limit and monitor.
The LT3952EFE is available in a thermally enhanced 28lead TSSOP package. Three temperature grades are available, with operation from 40°C to 125°C (junction) for the extended, and industrial grades, and a high temperature grade of 40°C to 150°C. Pricing starts at $3.95 each in 1,000piece quantities and all versions are available from stock. For more information, visit www.linear.com/product/LT3952.
4000:1 True Color PWM™ Dimming
4A, 60V Internal DMOS Switch
Wide Input Voltage Range: 3V to 42V
0V to 60V Output Current Regulation with Monitor
PMOS Switch Driver for PWM & Output
Disconnect
LED ShortCircuit Protection &
/SHORTLED Flag
Internal Spread Spectrum Frequency
Modulation
ConstantCurrent & ConstantVoltage
Regulation
Input Current Limit & Monitor
Adjustable Frequency: 200kHz to 3MHz, Synchronizable to an External Clock
10:1 Analog Dimming
Programmable OpenLED Protection with /OPENLED Flag
Programmable VIN Undervoltage & Overvoltage Lockout
Available in a 28Lead TSSOP Package
60V LED Driver with Internal 4A Switch & Internal ShortCircuit Protection Click Photo for HighRes ImageThe USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.
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 over 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 a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
John Hamburger
Tel: (408) 4321900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com
Fanny Lau
Tel: 85224280303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com
Yoshikazu Funasaki Tel: 81352267291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81332558411 linear@chugaiad.co.jp
Desiree Park
Tel: +8225656625 desiree@ezwire.com
Alice Wang
Tel: +886228974705 alice@ezwire.com
Ralf Stegmann
Tel: +49 (0) 7131923411 ralf@ezwire.com
Alan Timmins
Tel: +441252629937 alan@ezwire.com
Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com
Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com
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