Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3474
Edited by the Electronicstalk Editorial Team on 03 January 2006
LED driver shows its true colours
The LT3474 is a 36V, 2MHz step-down DC/DC convertor designed to operate as a constant current LED driver.
New from Linear Technology, the LT3474 is a 36V, 2MHz step-down DC/DC convertor designed to operate as a constant current LED driver An internal sense resistor and dimming control make it ideal for driving LEDs that require up to 1A of current
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
Related stories
Card power chip meets smart and SIM standards
The LTC4557 is a dual SIM/smart-card power supply and level translator, which provides both 1.8 and 3V SIM power and digital signal level shifting from a 3 x 3mm QFN package.
RF mixers take transformers onboard
Linear Technology has released two new high linearity up-converting RF active mixers with integrated RF transformers.
High output current accuracy is maintained over a wide current range of 35mA to 1A.
Novel "true colour PWM" circuitry allows a dimming range of 400:1 without any colour shift normally associated with LED current dimming.
With its wide input voltage range of 4 to 36V, the LT3474 regulates a broad array of power sources, from four-cell alkaline/NiCd/NiMH batteries and 5V logic rails to unregulated wall transformers and automotive power systems.
Its switching frequency can be set from 200kHz to 2MHz, enabling the use of tiny inductors and ceramic capacitors.
Combined with a thermally enhanced TSSOP-16 package, it offers a very compact solution for driving high current LEDs.
The LT3474 uses a high side sense, enabling a grounded LED cathode connection, eliminating the requirement for a grounding wire in most applications.
It also has an integrated boost diode, further reducing the solution footprint and cost.
Additional features include both open LED and short circuit protection.
The LT3474EFE is available from stock in a thermally enhanced 16-Lead TSSOP package with 1000-piece pricing starting at $2.95 each.
An I-grade version, the LT3474IFE, is also available from stock.
Its 1000-piece pricing starts at $3.54 each. Request a free brochure from Linear Technology Corp ...
• Linear Technology Corp: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
