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Catalyst Semiconductor Delivers Simple, Small White LED Driver Optimized for High-Volume 3-LED Applications

SUNNYVALE, Calif. - Catalyst Semiconductor, Inc. (NASDAQ:CATS)a supplier of analog, mixed-signal and non-volatile memory semiconductors, today further expanded its family of LED drivers with the CAT3603; a tiny, simple-to-use, high-efficiency fractional charge pump. The new device is optimized for high-volume, three-LED backlighting display applications in cellular phones, digital still cameras and handheld devices

Mainstream, high-volume consumer handheld and portable systems require feature-rich functions, long battery life and small size, at very low cost. Today, this typically means implementing a cost-effective three-LED configuration for color LCD backlighting. The CAT3603 is targeted specifically at these cost-sensitive, high-volume applications by providing simplicity and high efficiency in a tiny 3x3mm package.

The CAT3603 gives system designers the flexibility to select the desired LED brightness (1mA to 30mA) via a single external low-cost resistor. This simple solution eliminates the need for a complex interface control. Additionally, tightly matched output channels provide accurate illumination of up to three LEDs, resulting in uniform backlighting of the color LCD panel.

An automatic 1x/1.5x fractional charge pump maximizes battery life, allowing the CAT3603 to deliver up to 91 percent power efficiency. When disabled, the device enters �Zero� current shutdown mode, eliminating battery drain when not in use. Protection against short-circuit and thermal overload fault conditions is also included.

The cost-effective CAT3603, with its tiny, 3x3mm, 12-lead low-profile (0.8mm) TDFN package, expands Catalyst�s LED drivers by building on the Company�s earlier, CAT3604 device, which drives four LEDs and the CAT3606, which drives six LEDs, both in a 4x4mm 16-lead QFN package.
Product Features

* Drives up to 3 LEDs
* External resistor sets full-scale brightness
* Compatible with supply voltage of 3V to 5.5V
* Power efficiency up to 91%
* Output current up to 30mA per LED
* Fractional pump 1x/1.5x
* Low noise input ripple
* Fixed high frequency operation (1MHz)
* �Zero� current shutdown mode
* Soft start and current limiting
* Short circuit protection
* Low profile 0.8mm max height 3x3mm TDFN package
* 100% RoHS-compliant Green Package

Price and Green Package Availability

The CAT3603 is offered in a RoHS-compliant, environment friendly �green� 3x3mm TDFN 12-lead package. Ordering code is CAT3603HV2 and pricing for 10,000 piece quantity is $0.78. Samples and evaluation kits are now available. Projected lead-times for production quantities are currently 6 to 8 weeks ARO.

Miércoles, 07 Junio, 2006 - 01:54
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