Leadis Technology Expands LED Driver Portfolio
Leadis Technology, Inc. announced sample availability of the LDS8842 and LDS8830, the second and third in a new family of charge pump based LED drivers featuring a 1.33x-mode enabled charge pump. Targeted at mobile backlighting applications, the LDS8842 and the LDS8830 support up to four LEDs and three LEDs, and with maximum current supply of 25mA and 32mA per channel respectively.
In addition to the 1x/1.5x/2x charge pump modes traditionally offered, the LDS8842 and LDS8830 integrate an additional charge pump mode that generates an output voltage equal to 1.33 times the input voltage. The company claims that the 1.33x pump mode serves as a higher-efficiency intermediate mode between the 1x and 1.5x modes, resulting in efficiency improvements of up to 10% over traditional offerings. Compatible with input voltages ranging from 2.3 to 5.5V, these devices provide up to 92% efficiency with no added external capacitors. Both the LDS8842 and LDS8830 are offered in a 3mm x 3mm package, with the LDS8830 being also available in a tiny 2.5mm x 2.5mm package.
The LDS8842 is a 1x/1.33x/1.5x/2x fractional charge pump capable of driving up to four LEDs at up to 25mA each. LED dimming control is programmable with a one-wire interface enabling current level adjustment from 0.78mA to 25mA. LED channel matching is supported within +/-1.5%, with current accuracy at +/-2%. Input voltages from 2.5 to 5.5V are supported with efficiency up to 92%. Operation at switching frequencies of 1.3MHz (1.5x mode) and 1MHz (1.33x and 2x modes) enables low noise input ripple and utilization of small external ceramic capacitors. Other product features include soft start and current limiting, thermal shutdown and short circuit protection, and a low current shutdown mode of 1µA max. The LDS8842 is offered in a 16-lead thin QFN 3mm x 3mm package with a maximum height of 0.8mm.
The LDS8830 is a high-efficiency 1x/1.33x/1.5x/2x fractional charge pump capable of driving up to three LEDs at up to 32mA each. LED dimming control is programmable with a one-wire interface enabling current level adjustment from 1mA to 32mA. LED channel matching is supported within +/-1.5%, with current accuracy at +/-2%. Input voltages from 2.5 to 5.5v are supported with efficiency up to 92%. Operation at switching frequencies of 1.3MHz (1.5x mode) and 1MkHz (1.33x and 2x modes) enables low noise input ripple and utilization of small external ceramic capacitors. Other product features include soft start and current limiting, thermal shutdown and short circuit protection, and a low current shutdown mode of 1µA max. The LDS8830 is offered in a tiny 12-lead XQFN 2.5mm x 2.5mm with max height of 0.4mm or in a 16-lead TQFN or 12-lead TDFN 3mm x 3mm package with a max height of 0.8mm.
