CP2122 v1.0 product brief led driver series step-up white-led driver f or mid-size or large panel copyright ?2008 chiphomer technology limited 1 general description the CP2122 is a step-up dc/dc converter specifically designed for driving white leds with a const ant current. operation at a fixed switching frequency of 1.4mhz allo ws the device to be used with small value external ceramic capacitors and inductors. series connection of leds provides equal led current wh ich results in uniform brightness. 300mv feedback voltage minimizes the power loss in the current setting resistor for better efficiency. the CP2122 high-voltage output stage is ideal for driving parallel strings of up to seven white leds in series or up to 34v. the CP2122 features an internal soft start to eliminate inrush current during startup. equipped with built-in over-voltage protection function, the device enters a very lo w power operating mode during the ?open led? fault conditions. the CP2122 is available in sot23-5l package. features y switch current limit 700ma y drives led strings up to 34v y up to 84% efficiency y soft start ?in-rush? current limiting y fast 1.4 mhz switching frequency y built-in over-voltage protection y shutdown current: <1 a y low profile sot23-5l package applications y portable navigation devices y digital photo frames y portable media players y personal digital assistants y portable game machines pin configurations CP2122 top view sot23-5l sot23-5l -40 ~85
CP2122 v1.0 product brief led driver series step-up white-led driver f or mid-size or large panel copyright ?2008 chiphomer technology limited 2 typical application circuits 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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