Sunnyvale, Calif.Leadis Technology Inc. has started to sample the LDS8860, a charge-pump based 6-channel LED driver that implements the company's proprietary PowerLite Current Regulator to deliver up to 91% power efficiency for longer battery life.
Targeted at mobile backlighting applications, the LDS8860 supports up to six LEDs with a maximum current of 32mA per channel. According to Leadis, the ultra low voltage dropout PowerLite Current Regulator provides a typical transition threshold of only 50mV, allowing the device to stay in a charge-pump driver's highest-efficiency mode longer than competing devices. By lowering the dropout voltage of the driver to only 50mV, battery life can be extended by up to 10%.
Low noise and input ripple performance is achieved by operating the charge pump at a constant switching frequency of 1 MHz, which allows the use of small external ceramic capacitors.
The LED channels are configured into three independent banks, each containing 2 matched channels. Each pair can be separately programmed from zero to 32mA, in 0.5mA increments, using a I²C serial interface. Any individual channel can be disabled, while others remain active. The device is available in a 16-lead TQFN 4mm x 4mm or a 3mm x 3mm package with a maximum height of 0.8mm.
Leadis Technology Inc., www.leadis.com