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WLED driver uses true single-wire digital interface

Posted: 03 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:white LED driver? internal Schottky Diode? single-wire digital interface? MIC3289?

Micrel Inc. has launched the MIC3289, a 1.2MHz PWM white LED (WLED) driver featuring internal Schottky diode and true single-wire digital interface for brightness control and enable function.

The new device's full operating input voltage range of 2.5-6.5V supports use with popular power sources including Li-ion battery, multicell alkaline, 5V AC adapter and USB port. The MIC3289 requires four external components to provide a complete solution. The integration of the Schottky diode and the tiny 2-by-2mm MLF packaging allows for solution sizes up to 50 percent smaller than the competition, according to the company. The device is also protected with an OVP circuit and is available in 16V and 24V overvoltage protection options, supporting up to six WLEDs at 20mA each.

"The single wire digital interface used in Micrel's MIC3289 provides both brightness control and the enable function," said Ralf Muenster, Micrel's director of marketing for power products. "This reduces the number of GPIOs needed to control the device and is especially advantageous in clamshell phone designs where limited traces can be routed through the flex cable. In addition, the part features 16 logarithmic dimming steps, mimicking the way the human eye perceives brightness levels, allowing to minimize programming steps when compared to industry-standard products which offer 32 linear steps."

The new device is currently available in volume and in two package choices: a TSOT-23-6 and a 2-by-2mm MLF 8L package. Pricing for the device starts at $1 for 1,000-unit quantities.

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