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LED driver trims component count in designs

Posted: 05 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:small LED driver? save board space?

Exar Corp. has released a LED driver in a small 3mm x 3mm QFN package that integrates several off-chip functions, which lowers external component requirements while saving board space. The SP6887 is a charge pump-based 4-channel LED driver that requires only five external components.

The SP6887 is suitable for two key market areas: small display/keypad LED lighting applications found in handheld portable devices such as PDAs, cellphones and data collection devices, and architectural and general-purpose LED systems found in office equipment operator panels.

The SP6887 is compatible with PWM dimming up to 1kHz and analog dimming. The device offers the ability to enable/dim individual LEDs through a 3bit parallel interface and can vary the current through an analog control pin. In addition, the drivers are adjustable from 1.1mA to 30mA with peak efficiencies of 90 percent and provide an input voltage operating range of 2.5-5.5V. The SP6887 also delivers a 3 percent channel-to-channel current matching to ensure even color and brightness among all four LEDs. The operating temperature range is -40C to 85C.

Pricing starts at 65 cents in quantities of 1,000. Samples are available now.

- Gina Roos

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