CP2142 v1.0 product brief led driver series 4-channel low-dropout constant-current parallel led driver with 1-wire pulse counting dimming control copyright ? 2007 chiphomer technology limited 1 general description the CP2142, a 4-channel low-dropout constant-current parallel led driver, can be used to drive white le d, red led, blue led or any color led whose forward operating voltage is lower than the battery voltage. the unique auto-mirror tm technology is introduced in CP2142, which can guarantee a constant led current in various operating conditions. the CP2142 uses the 1-wire pulse counting technique to adjust the brightness of leds, with the pulse signal on the en pin, the led current varies according to 16 steps logarithmic scale. the CP2142 is available in msop-8l package and is ideally suitable for portable device applications. features y no external component required y only 100mv dropout voltage needed at 20ma per channel y 1-wire pulse counting dimming: 16 steps logarithmic scale y led current matching: 2% (typical) y over 90% efficiency can be reached y no emi and switch noise y thermal shutdown protection y supply voltage range: 2.7~5.5v y shutdown current less than 0.1a y rohs compliant and 100% lead(pb)-free applications y mobile phones y digital still camera y mp3 pda y gps receivers pin configuration msop-8l -40 ~ 85
CP2142 v1.0 product brief led driver series 4-channel low-dropout constant-current parallel led driver with 1-wire pulse counting dimming control copyright ? 2007 chiphomer technology limited 2 typical application circuit contact with chiphomer 4f, building d, 1618 yishan road shanghai, 201103, p.r.c. tel: (86)21-64014543 64058488 fax: (86)21-64050030 sale: sales@chiphomer.com technical support: support@chiphomer.com web site: www.chiphomer.com shenzhen office: 10d, building 2, dushi yangguang garden chegongmiao, futian district, shenzhen, 518048, p.r.c. tel: (86)755-82046706 82047789 fax: (86)755-8204670
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