Parallel LED Driver Hits 93% Peak Efficiency

The FAN5607 constant-current parallel LED driver from Fairchild Semiconductor provides analog and/or pulse-width-modulation brightness control for LCD backlighting in ultra-portable applications. It uses a three-mode charge pump and achieves 93% peak efficiency. Internal auto-sense circuitry maintains high efficiency, even when driving less than a maximum of four LEDs, and ensures very tight current matching over the full range of LED current. Also, it requires no external control signal to maintain efficiency when driving fewer than four LEDs. It comes in a 4- by 4-mm molded leadless package (MLP). Thousand-unit pricing is $0.90 each.