White LED Driver powers up to 10 LEDs.
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Press Release Summary:
Housed in 2 x 2 mm DFN or ThinSOT package, constant-current Model LT3593 features high-side LED current sense topology that enables LED cathode to be connected directly to ground, creating single wire current source. Single digital control pin enables set-and-forget LED dimming with ratios as high as 32:1. Operating from input voltage of 2.7-5.5 V, device features 1 MHz constant switching frequency and can drive up to 10 white LEDs from single Li-Ion cell at efficiencies over 80%.
Original Press Release:
High Efficiency White LED Driver Powers up to 10 LEDs, Offering 32:1 Dimming Ratio
MILPITAS, CA - April 28, 2008 - Linear Technology announces the LT3593, a high efficiency constant current white LED driver packaged in a 2mm x 2mm DFN (or ThinSOT(TM)) package. It features a unique high-side LED current sense topology that enables the LED cathode to be connected directly to ground, creating a single wire current source. Also a single digital control pin enables set-and-forget LED dimming with ratios as high as 32:1. The LT3593 is designed to drive up to 10 white LEDs from a single Li-Ion cell at efficiencies over 80%. It operates from an input voltage from 2.7V to 5.5V, optimizing it for single cell Li-Ion and multicell alkaline/NiCd/NiMH sources. Its 1MHz constant switching frequency allows the use of tiny, low profile inductors and capacitors while keeping input and out put noise low and well controlled. The combination of high efficiency, low noise and extremely small total solution footprint makes the LT3593 ideal for handheld applications, requiring up to 10 white LEDs for backlighting.
The LT3593 ensures the uniform brightness of each LED by acting as a constant current source, delivering the same current to each white LED, regardless of fluctuations in the LED's forward voltage drop, which varies with temperature, manufacturing tolerances and age. The LT3593 uses a single wire digital serial interface to deliver 32:1 linear brightness control. Additional features include output disconnect in shutdown, open LED protection and a ±5% reference accuracy.
The LT3593 is available from stock in a 6-lead 2mm x 2mm DFN or ThinSOT package. Pricing starts at $1.40 each for 1,000-piece quantities.
Summary of Features: LT3593
Drives up to Ten White LEDs from a 3V Supply
One-Pin Shutdown & Current Programming
LEDs Disconnected in Shutdown
Single Wire 32:1 Brightness Control Range
VIN Range: 2.7V to 5.5V
±5% Output Current Accuracy at Full Scale
Low Shutdown Current: 3uA
1MHz Switching Frequency
Requires Only 1uF Output Capacitor
Low Profile 6-Lead DFN (2mm x 2mm x 0.75mm) & 6-Lead SOT-23 Packages
White LED Driver with 1-Wire 32:1
Dimming in 2mm x 2mm DFN
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(TM) 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. For more information, visit www.linear.com.
LT, LTC, LTM and Burst Mode are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
