Boost Converter Family Drives More LEDs from Lower Input Voltages.SUNNYVALE, Calif. -- Catalyst Semiconductor, Inc. (NASDAQ NASDAQ in full National Association of Securities Dealers Automated Quotations U.S. market for over-the-counter securities. Established in 1971 by the National Association of Securities Dealers (NASD), NASDAQ is an automated quotation system that reports on :CATS), a leading supplier of high performance mixed-signal and memory solutions, today expands its family of solid state illumination products with the CAT4137 and CAT4237. Optimized for mobile LED lighting and backlight applications, the CAT4x37 family operate down below 2.5V and drive up to 8 white LEDs in series from a 3V source. Power efficiency as high as 87% and a "zero" shutdown current feature extend battery life in both operation and sleep modes. A unique over voltage circuit protects against open LED faults while reducing pin count and eliminating the need for large, costly external zener diodes. Further savings in board layout area result from the CAT4x37's high frequency switching operation. For applications requiring greater luminous intensity, the CAT4237 is designed to drive up to 40mA. This allows system designers to use higher power LEDs or a larger number of standard LEDs. Backlight integrity is maintained with current regulation typically better than 0.1% across supply and 1.0% across temperature. "Backlight module designers are challenged with sourcing the changing requirements of their end customers. The flexibility and performance of the CAT4x37 family eliminates the headache and cycle time of qualifying new LED drivers for each new backlight design," comments Jamie White, Mixed Signal Marketing Manager. CAT4137/4237 Applications --Mobile LED backlight systems for cell phones, MP3, PDA (Personal Digital Assistant) A handheld computer for managing contacts, appointments and tasks. It typically includes a name and address database, calendar, to-do list and note taker, which are the functions in a personal information manager (see PIM). , DSC (1) (Digital Signal Controller) A microcontroller and DSP combined on the same chip. It adds the interrupt-driven capabilities normally associated with a microcontroller to a DSP, which typically functions as a continuous process. See microcontroller and DSP. , games, navigation --LED illumination for digital cameras --LED torch and flashlights Product Features --Drives 6 to 8 White LEDs in series from 3V (CAT4237) --Up to 87% Efficiency at load --Adjustable Output Current up to 40mA (CAT4237) --High Frequency Operation (1MHz (MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (16, 32, 64, etc. ) --Shutdown Current less than 1uA --Integrated Low Power Open LED protection --Integrated UVLO UVLO Undervoltage Lockout UVLO Under Voltage Lock Out and Soft Start --Tight Line Regulation --Thin SOT5 Green/ROHS package Price and Green Package Availability The CAT4237 and CAT4137 are available in a 5-pin ThinSOT package; pricing in 1,000 piece quantities is $0.85 and $0.80 respectively. The CAT4237 and CAT4137 are available in RoHS compliant, environment friendly "green" packages that are halogen and lead free. Samples, evaluation kits and production quantities are available at the time of this publication. About Catalyst Semiconductor Founded in 1985, Catalyst Semiconductor, Inc. is headquartered in Sunnyvale, California. The Company's products include nonvolatile memories such as Flash Memories, Serial and Parallel EEPROMs with I2C I2C Inter-Integrated Circuit I2C Intelligent Interface Controller I2C Intelligent Controller , SPI (1) (Stateful Packet Inspection) See stateful inspection. (2) (Service Provider Interface) The programming interface for developing Windows drivers under WOSA. , and Microwire interfaces, and NVRAM (Non-Volatile RAM) May refer to dynamic RAM (DRAM) and static RAM (SRAM) chips that are backed up by a battery or to non-volatile chips such as flash memory. See non-volatile memory, dynamic RAM, static RAM and solid state disk. ; as well as analog/mixed-signal products such as Digitally Programmable Potentiometers (DPP DPP - Dining Philosophers Problem (TM)), Microcontroller Supervisory circuits, White LED Drivers, and other mixed-signal products. Catalyst products are used in telecommunications, networking systems, computation, automotive, industrial and consumer markets. Typical applications include LCD displays, automotive instrumentation, optical networks, modems, wireless LANs, network cards, DIMM (Dual In-Line Memory Module) A printed circuit board that holds memory chips and plugs into a DIMM socket on the motherboard. See memory module. DIMM - Dual In-Line Memory Module modules, cellular telephones, digital satellite box receivers, set-top boxes and Internet routers. Catalyst's Quality Management System is ISO (1) See ISO speed. (2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI. 9001:2000 certified. For additional information about Catalyst Semiconductor, visit our website at: www.catalyst-semiconductor.com. Forward Looking Statements Except for those statements that report the Company's historical results, the statements being made are forward-looking statements. Actual results could differ materially from those projected in the forward-looking statements. Additional information concerning factors that could cause actual results to differ materially from those in the forward-looking statements is contained under the heading "Certain Factors That May Affect the Company's Future Results of Operations" listed from time-to-time in Catalyst's SEC reports including, but not limited to, the report on the Form 10-K for the year ended April 30, 2005; and Form 10-Q for the quarter ended July 21, 2005. Editor Notes: 1. Trademark notices: DPP is a trademark of Catalyst Semiconductor, Inc. I2C is a registered trademark of Philips Corporation. SPI is a trademark of Motorola, Inc. 2. The "2" in I2C is superscript Any letter, digit or symbol that appears above the line. For example, 10 to the 9th power is written with the 9 in superscript (109). Contrast with subscript. . 3. Electronic images are available at: www.catalyst-semiconductor.com/editor. |
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