Targeted at portable backlight applications, the CAT3614 drives up to four white LEDs across inputs from 2.5V to 5.5V. Battery life is maximized with the use of an automatic 1x/1.5x charge pump which delivers up to 91% power efficiency. A "zero" current-shutdown limits battery drain in shutdown mode.
Chip enable, shutdown and LED dimming are each done using a new 1-wire digital interface. This simple serial interface eliminates the need for PWM or multi-wire control methods. LED current can be controlled in 32 accurate steps of 1mA each.
Unlike competitive devices, the CAT3614's current regulation method reduces flicker and maintains backlight integrity during battery spikes -- a common problem in portable systems using media drive, LAN or audio power amps. Further improvements in noise reduction are made by eliminating the LED current setting resistor, which can couple noise during cell phone data transmission.
A tiny RoHs-compliant, 3mm x 3mm TDFN package, low external parts count and high fixed frequency operation all contribute to the reduction of system board area.
Product Features
-- Drives up to 4 LEDs at 30mA each
-- Single Wire LED Current Programming and Enable/Disable
-- Power Efficiency up to 91%
-- Accurate 1mA Dimming Level
-- Automatic 1x/1.5x Fractional Charge Pump
-- Very Low-Noise Input Ripple
-- Fixed High Frequency Operation (1MHz)
-- "Zero" Current Shutdown Mode
-- Soft Start and Current Limiting
-- Thermal Shutdown Protection
-- 12-Lead TDFN 3mm x 3mm Package
-- 100% RoHs Green Package with NiPdAu plated leads
Price and Green Package Availability
The CAT3614 is offered in RoHs compliant, environment friendly "green and gold" packages that are halogen and lead free. Pricing in 1,000 piece quantities is $0.94. 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 produces analog and mixed signal products in addition to an extensive range of nonvolatile memories. The analog and mixed-signal product lines include Digitally Programmable Potentiometers (DPP(TM)), Microcontroller Supervisory circuits, White LED Drivers and DC/DC converters. The memory product lines consist of Serial and Parallel EEPROMs, Flash and NVRAM. Catalyst devices 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 modules, cellular telephones, digital satellite box receivers, set-top boxes and Internet routers. Catalyst's Quality Management System is ISO 9001:2000 certified. For additional information about Catalyst Semiconductor, visit our website at: www.catsemi.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 subsequent two quarters.
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.
3. Electronic images are available at:
www.catsemi.com/editor.
Contact:
Catalyst Semiconductor, Inc. Scott Brown, 408-542-1114 Fax: 408-542-1200 Email Contact