LED drivers boast small size, thin profile, high power efficiency - Embedded.com

LED drivers boast small size, thin profile, high power efficiency

Three white LED drivers from On Semiconductor are designed to drive high-brightness LEDs in backlighting applications for cellular phones, digital cameras, MP3 players, and other portable consumer electronics devices. With up to 90% efficiency and a 0.6-mm package profile, the devices help designers meet the stringent power and board space budgets of today's battery-powered portable electronics.

The NCP5010 supplies up to 22 V typical to power a series of two to five white LEDs for LCD backlighting applications. Delivering up to 84% efficiency and 1-μA shutdown current, the part operates on input voltages from 2.7 to 5.5 V. It features true cut-off, short-circuit and overvoltage protection, and undervoltage lock-out.

This space-saving device is offered in a flip-chip package utilizing less than 3 mm2 of board space and requires only 0.6 mm of profile room. The 1-MHz frequency of the integral PWM boost converter and the integration of a Schottky rectifier, enables board designs to be optimized for small inductors and capacitors. The NCP5010 is offered in a Pb-free, 8-pin, 1.7- by 1.7- by 0.6-mm flip-chip package. It is priced at $0.67 in 3000 unit quantities.

The NCP5604A and NCP5604B drive either 3 or 4 LEDs, respectively at up to 25 mA per LED. Current matching tolerances of 0.5% ensure excellent uniform LED brightness. Delivering up to 90% efficiency and less than 1-μA quiescent current, these devices operate on input voltages from 2.7 to 5.5 V and feature unique short-circuit and overvoltage protection. Both the NCP5604A and NCP5604B are offered in a thin profile QFN package (WQFN) that requires only 0.8 mm of profile room. The NCP5604A costs $0.69, while the NCP5604B sells for $0.66, both in 3000 unit quantities. For more information, visit On Semiconductor's Web site at www.onsemi.com.

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