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Linear Technology announces high-side current-sense LED driver

Apr 08, 2010

Linear Technology


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Milpitas, California – April 8, 2010
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.
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: /li>
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

. . . . .
Media Contact
Name: Doug Dickinson
Title: Media Relations Manager
Tel: 408-432-1900 ext. 2233
E-mail: ddickinson@linear.com



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