LED Drivers Simplify Single-Cell Apps

According to the company, the ZXLD381 and ZXLD383 LED drivers provide the simplest possible solution for driving low-power, high-brightness LEDs from a single solar or rechargeable battery cell. Deployed in PFM dc/dc converters with an on-board low saturation voltage switching transistor, the devices need only an inductor for high efficiency LED illumination. Both chips operate from an input voltage as low as 0.9V and deliver up to 80 mA and specify efficiencies as high as 93%. The ZXLD383 combines the features of the ZXLD381 with a dual function enable input that provides an inhibit control and an ultra-low voltage drop isolation diode for battery charging purposes. This eliminates the need for an external photocell array isolation diode, making the driver suitable for use in solar-powered garden and walkway lamps. Prices for the ZXLD381 and ZXLD383 are $0.28 and $0.30 each/1,000, respectively. DIODES INC., Westlake Village, CA. (805) 446-4800.