Sep 20 2010
ON Semiconductor has rolled out the new CAT3661 Quad-Mode LED Driver designed for low-power LED applications, such as portable medical devices. The CAT3661 utilizes a patented architecture and combines fault diagnostics and fault protection. It can drive one LED backlight with a maximum current of 5 mA.
CAT3661 Quad Mode LED Driver
As the new LED driver offers protection against short-circuit, and soft-start current limiting, it is suitable for devices that are operated by coin cell batteries. Typical applications of the driver include backlighting for various portable handheld devices, and low-power backlighting for application in LCDs.
The CAT3661 is packed in a 16-lead TQFN package that measure only 3 x 3 x 0.8 mm high. It offers vital solutions for engineers who work on the latest designs, where the board space available is limited. The overall system cost and space are improved, because the uniform switching frequency and low noise input ripple of the equipment enable the utilization of external ceramic capacitors.
The CAT3661 LED driver’s quad-mode charge pump supports input voltage range from 2.0 to 5.5 V. The charge pump also aids the device to attain maximum efficiency levels of up to 92%, which is 10% higher than the conventional 1.5x tri-mode charge pumps. A zero current shutdown, and 150 µA quiescent current across operational modes at full load, help in decreasing the consumption of power and makes sure the battery life of the application is maximized.