White LED driver optimised for lithium ion power

The CAT3604 current regulated charge pump delivers uniform, flicker-free white LED illumination for backlighting LCDs and keypads in integrated mobile applications.

The CAT3604 current regulated charge pump delivers uniform, flicker-free white LED illumination for backlighting LCDs and keypads in integrated mobile applications.

Optimised for use with lithium ion battery powered systems, the CAT3604 maximises power transfer by achieving very high efficiencies of up to 93%.

Each output channel is current regulated to provide precise matching of up to four parallel LEDs, guaranteeing even brightness control across the panel.

Soft start, combined with a unique fractional charge pump topology ensures stable output voltage over the life of the battery by automatically switching between 1x LDO mode and 1.5x boost mode.

The CAT3604's digital inputs provide full control of each LED channel for dimming or system shutdown, where the device draws less than 1uA.

The 1MHz fixed frequency control scheme enables the use of small external capacitors, and EMI is kept to a minimum by the inductorless design.

The combination of high efficiency, low input ripple, low noise and the space saving 4 x 4 x 0.8mm thin QFN package makes the CAT3604 the ideal white LED driver for use in today's mobile phones, smart phones, PDAs, digital still and video cameras, portable MP3 players and handheld instruments.

Priced at $1.68 in 1000-piece quantities, the Catalyst CAT3604 is available in halogen and lead free environment friendly "green" packages.

Samples are available now; production quantities will be available during September 2004.

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