Leadis Technology Expands Six Channel LED Driver Family With 1-Wire Interfaces

New Products Feb 18, 2008 by Jeff Shepard

Leadis Technology, Inc. announced sample availability of the LDS8867, LDS8868, and LDS8869, a new family of charge-pump based LED drivers that uses the company’s proprietary PowerLite™ Current Regulator to deliver up to 95% power efficiency for longer battery life.

Targeted at mobile backlighting applications, the latest LED driver device family supports up to six LEDs with a maximum current of 32mA per channel. The new 1-wire interface products join the previously announced PWM interface products to give mobile phone design engineers more flexibility with a new set of performance/interface choices.

Leadis’ ultra low-voltage dropout PowerLite™ Current Regulator provides a typical transition threshold of only 50mV, allowing a device to stay in a charge-pump driver’s highest-efficiency mode longer. Additionally, this patent-pending technique is also said to solve one of the most significant problems associated with charge-pump based LED Drivers, namely the transition between the high-efficiency state (1x-mode) and the lower efficiency states. By lowering the drop out voltage of the driver to only 50mV, battery life can be extended by up to 20%.

The LDS8869 is a high-efficiency multi-mode fractional charge pump with ultra low dropout voltage that can drive up to six LEDs. The addition of a 1.33x fractional charge pump mode and ultra low dropout PowerLite™ Current Regulator increase the LDS8869’s efficiency up to 95%. The 1.33x mode requires no additional external capacitors. Its EN/SET logic input functions as a chip enabler and LED current control.

Maximum LED current is 32mA and can be programmed from 0.5mA to 32mA in 0.5mA increments. The multi-fractional charge pump supports a wide range of input voltages from 2.7V to 5.5V. The device is available in a 16-lead TQFN 3mm x 3mm package with a maximum height of 0.8mm.

The LDS8868 is a high-efficiency multi-mode fractional charge pump with ultra low dropout voltage that can drive up to six LEDs. The addition of an ultra low dropout PowerLite™ Current Regulator increases the LDS8868’s efficiency up to 93%. Its EN/SET logic input functions as a chip enabler and LED current control.

The LDS8867 is a multi-mode fractional charge pump with low dropout voltage that can drive up to six LEDs with up to 90% efficiency. Its EN/SET logic input functions as a chip enabler and LED current control. Maximum LED current is 32mA and can be programmed from 0.5 to 32mA in 0.5mA increments. The multi-fractional charge pump supports a wide range of input voltages from 2.7 to 5.5V. The device is available in a 16-lead TQFN 3 x 3mm package with a maximum height of 0.8mm.