Product category:
Power Supply ICs and Controllers
News Release from: Catalyst Semiconductor | Subject: CAT3626
Edited by the Electronicstalk Editorial
Team on 31 March 2006
Charge pump powers up multiple
backlights
The CAT3626 is designed to easily and efficiently power backlighting for multiple displays, drive RGB "fashion-lighting" and control flash functions in high-performance portable applications.
Catalyst Semiconductor has expanded its family of LED drivers with the CAT3626, a low noise fractional charge pump with an I2C serial bus interface for precise control and programming of up to six white/colour LEDs The CAT3626 is designed to easily and efficiently power backlighting for multiple displays, drive RGB "fashion-lighting" and control flash functions in high-performance portable applications, including cellphones, handheld devices and digital cameras
This article was originally published on Electronicstalk on 7 Feb 2002 at 8.00am (UK)
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Unlike most competing devices, the CAT3626 is designed with a current regulation scheme which minimises LED flicker during periods of sudden battery fluctuations - a common problem in portable systems experiencing repetitive load bursts, such as RF or audio power amplifiers.
Catalyst helps designers simplify system programming by configuring the CAT3626 LED driver's six output channels into three separate banks, with each bank containing a pair of tightly regulated and matched output channels.
This makes the new device ideal for portable products with any combination of multiple RGB LEDs, LCD/keypad backlighting and flash functions.
Additionally, an I2C interface allows LED currents within each dual output channel bank to be conveniently and accurately controlled in 0.5mA steps from zero to 32mA, yielding a total device output current of up to 192mA.
Targeted at battery-powered portable applications with supply voltages from 2.5 to 5.5V, the CAT3626 maximises battery life with an automatic 1x/1.5x charge pump, which delivers up to 91% power efficiency.
A dedicated enable control allows the device to be placed into "zero" current shutdown mode, eliminating battery drain when not in use.
In addition to enhanced illumination integrity, the CAT3626 offers low noise input ripple, as well as protection against short-circuit and thermal overload fault conditions.
A low profile, 0.8mm, RoHS compliant 4 x 4mm TQFN package, low external parts count and fixed high frequency (1MHz) operation all contribute to the reduction of system board area.
The CAT3626 is offered in a RoHS-compliant, environment friendly "green" 4 x 4mm TQFN 16-lead package.
Ordering code is CAT3626HV4-T2 and pricing for 10,000 piece quantity is $0.96.
Samples and evaluation kits and are now available.
Projected lead-times for production quantities are currently 6 to 8 weeks ARO.
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