Product category:
Power Supply ICs and Controllers
News Release from: Catalyst Semiconductor | Subject: CAT4004
Edited by the Electronicstalk Editorial
Team on 10 April 2007
Novel LED driver saves portable power
Low dropout driver is designed for emerging power-conscious portables where the LEDs are driven directly from the battery.
New from Catalyst Semiconductor, the CAT4004 is a four-channel LDD (low dropout driver) designed for emerging, power-conscious portables where the LEDs are driven directly from the battery With the migration of white LEDs to lower forward voltages, a number of portable applications are now able to drive LEDs directly from the system battery without the need to boost voltage
This article was originally published on Electronicstalk on 7 Feb 2002 at 8.00am (UK)
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The new CAT4004 is designed specifically to meet the needs of this emerging market requirement by achieving a low dropout voltage of 130mV, which maximises LED performance as system battery voltage decays.
"When driving LEDs in portable systems, the end-of-life battery voltage is directly proportional to the sum of the LED forward voltage and the LED driver dropout voltage", said Scott Brown, Vice President of Marketing for Catalyst Semiconductor.
"As the market trends toward lower voltage LEDs, a portion of the market will choose to drive LEDs directly from the battery".
"The low dropout voltage of the CAT4004 LDD will enable these designers to significantly extend battery life".
The CAT4004 LDD features tight current matching of +/-5% across a wide range of LED voltages.
It also offers LED programming simplicity via Catalyst's one-wire EZDim interface, which allows output enable/disable and LED dimming control all from a single I/O on the system microcontroller.
LED current can be controlled at six levels: 100% (full-scale brightness), 50%, 25%, 12.5%, 6% and 3%.
The CAT4004 low dropout LED driver is priced at US $0.52 each in 10,000 piece quantities.
Samples are available now.
Projected lead-time for production quantities is currently 6 to 8 weeks ARO.
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