45V, 1.5A LED Driver for Boost, Buck or Buck-Boost High Current LED Applications Offers Maximum Junction Temperature of 150ºC

News Release ⎜ www.linear.com
45V, 1.5A LED Driver for Boost, Buck or Buck-Boost High Current LED
Applications Offers Maximum Junction Temperature of 150◦C
MILPITAS, CA – April 8, 2010 – Linear Technology announces the H-grade version of the
LT3517. The LT3517 is a high side current sense DC/DC converter designed to drive high
current LEDs at constant current. Its 3V to 30V input voltage range with transient protection to
40V makes it ideal for a range of applications, including automotive, industrial and architectural
lighting. The H-grade version operates with a junction temperature up to 150˚C, compared to the
E- and I-grade versions’ 125˚C maximum junction temperature. All electrical specifications are
identical for the E-, I- and H-grade versions. The H-grade parts are tested and guaranteed to the
maximum junction temperature of 150˚C, making them ideal for automotive and industrial
applications which are subjected to high ambient temperatures.
The LT3517 can drive up to four 300mA white LEDs from a nominal 12V input, making
it ideal for applications such as automotive display backlighting. The LT3517 senses output
current at the high side of the LED, enabling buck, buck-boost or boost configurations. The
device delivers efficiencies up to 90% in boost mode from a 4mm x 4mm QFN package. The
LT3517 offers True Color PWM™ dimming which ensures constant LED color with dimming
ranges of up to 5,000:1. For less demanding dimming requirements, the CTRL pin can be used to
provide 10:1 analog dimming. Its fixed frequency, current mode architecture offers stable
operation over a wide range of supply and output voltages. A frequency adjust pin enables the
user to program the frequency between 250kHz and 2.5MHz to optimize efficiency while
minimizing external component size.
The LT3517HUF is available from stock in 16-pin QFN package, priced starting at $3.49
each in 1,000-piece quantities. For more information, visit www.linear.com.
45V, 1.5A LED Driver for Boost, Buck or Buck-Boost High Current LED
Applications Offers Maximum Junction Temperature of 150 C
page 2
Photo Caption: 45V, 1.5A LED Driver Offers Maximum Junction Temperature of 150◦C
Summary of Features: LT3517H
150◦C Maximum Junction Temperature
5000:1 True Color PWMTM Dimming Ratio
1.5A, 45V Internal Switch(LT3517)
100mV High Side Current Sense
Open LED Protection
Adjustable Frequency: 250kHz to 2.5MHz
Wide Input Voltage Range:
o Operation from 3V to 30V
o Transient Protection to 40V
Operates in Boost, Buck Mode & Buck-Boost Mode
Gate Driver for PMOS LED Disconnect
Constant-Current & Constant-Voltage Regulation
CTRL Pin Provides 10:1 Analog Dimming
Low Shutdown Current: <1uA
Tiny (4mm × 4mm) 16-Pin QFN Package
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits,
was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major
public companies in 2000. Linear Technology products include high performance amplifiers,
comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery
chargers, data converters, communications interface circuits, RF signal conditioning circuits,
uModule® products, and many other analog functions. Applications for Linear Technology’s
high performance circuits include telecommunications, cellular telephones, networking products
such as optical switches, notebook and desktop computers, computer peripherals,
video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer
products such as digital cameras and MP3 players, complex medical devices, automotive
electronics, factory automation, process control, and military and space systems.
LT, LTC, LTM, uModule and
are registered trademarks and True Color PWM is 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
[email protected]
Tel 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
408-432-1900 ext 2233
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