Catalyst Semiconductor has added a high efficiency white LED driver to its family of ICs for panel illumination circuitry. The CAT3604 current regulated charge pump is optimised for use with lithium ion battery powered systems.

Each output channel is current regulated to provide precise matching of up to four parallel LEDs. Soft start combined with a unique fractional charge pump topology are designed to ensures stable output voltage over the life of the battery by automatically switching between 1x LDO mode and 1.5x boost mode.

The digital inputs provide full control of each LED channel for dimming or system shutdown, where the device draws less than 1µA. The 1MHz fixed frequency control scheme enables the use of small external capacitors, while the inductor-less design minimises EMI interference.

They are available in 4x4x0.8mm thin QFN package.

jxs@spectrumuk.com