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White LED drivers suit dual-display phones

Posted: 24 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:white-LED drivers? dual-display architectures? inductive boost converter?

Sipex released the latest addition to their family of white LED drivers for the portable market, the SP6415. The device features an inductive boost converter powering two independent drivers for driving the white LED main panel backlighting and powering the OLED sub-display or additional white LEDs. Suited for dual-display architectures including clamshell phones, the SP6415 can be configured to automatically turn off the sub-display when the phone is open. Each driver output current is programmed by a single external resistor. PWM dimming is possible via the enable pin, which also is used to put the device into a 1?A showdown, enabling extended battery life.

With an output voltage up to 20V, as many as five LEDs in series can be powered at over 80 percent efficiency when the SP6415 is powered from a single-cell Li-ion battery or internal 3.3V or 5V rails found in most hand-held equipment. When switching from powering the main display to the sub-display, voltage is adjusted to maximize efficiency and minimize power loss. Additionally, the device offers a full protection scheme against fault conditions including overvoltage, overcurrent, over-temperature and undervoltage lock-up. The SP6415 is offered in a Pb-free DFN-10, RoHS-compliant package meeting the extended temperature range of -40C to 85C.

The devices are available at $1.40 each in 1,000-piece quantities.

- Emily Gleason

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