Nov 25 2010
IXYS announced that the demo and sample boards of the LDS8991 WLED driver is available with low dropout voltage. The LDS8991 is a high-efficiency, inductor-less WLED driver and has the ability to drive a HB LED at 200 mA in TORCH mode and at 1.2 A in FLASH mode. It comes in a compact 12-pin TDFN package and measures 3 x 3 x 0.8 mm.
The LDS8991 WLED driver is suitable for HB LED torch and photoflash for smart phones, video cameras, and digital cameras, where continuous light is required for capturing video under low lighting conditions.
The WLED driver features a sturdy protection system and shields against short-circuit, under-voltage, over-temperature, and over-voltage. The device’s shutdown current is less than 1 microamp, which is suitable for battery operated products. The driver needs three external capacitors - 2.2 microfarad capacitor at the output terminal, 1microfarad as a charge pump flying capacitor, and a 1 microfarad at the input terminal.
The device can function in 2-x and 1-x charge pump modes. It also includes a PowerLite Current Regulator that enhances the unit’s efficiency by a maximum of 90%. The 200 mA TORCH and the 1.2A FLASH currents are factory programmed. The TORCH current has the ability to be programmed in 1.5 mA steps, whereas the FLASH current is programmable in 50 mA steps.