product brief CP2168 v1.0 led driver series high efficiency 1x/1.5x fractional charge pump for white led (pwm brightness control) with dual channel 200ma ldo copyright ?2008 chiphomer technology limited 1 overview 3mm*3mm qfn 20l -40 85 0 the CP2168 is an integrated solution for 4 white led supplies in backlighting color display applications and phone camera input supply. the device contains a self adapted charge pump white led driver and dual channel low dropout linear regulators. the CP2168 is available in a small 20-pin 3mm*3mm qfn package. in the section of charge pump, high efficiency is achi eved by utilizing a 1x/1.5x adaptive fractional conversion technique in combination with low dropout current regul ator. the CP2168 provides up to 4 led at 30ma each. led brightness are controlled through pwm control signal in the section of ldo, the CP2168 contains a dual channel, low noise, and low dropout regulator sourcing up to 200ma at each channel, and while the typical dropout-v oltage is 200mv. the excellent transient response performance, high psrr and no bypass capacitor makes t he ldos suitable for digital applications. the output voltage ranges from 1.0v ~3.3v. anti reverse current function can prevent reverse current in the situation that the output voltage is above the input voltage. the ldo also provides current limiting and short-protection. features z supply voltage ranging from 2.7 v to 5.5 v z over-current, over-temperature and short protection z anti reverse current z 3mm*3mm qfn 20l z less than 0.1 a quiescent current in shutdown mode z rohs6 compliant charge pump section z drives up to 4 leds at 30 ma each z regulated output current with 0.5% matching z utilizing a 1x/1.5x adaptive fractional conversion technique for high efficiency (up to 92%) z low input ripple and low emi z 1 mhz operating frequency z led brightness controlled by pwm signal up to 50khz ldo section z low dropout voltage at 200ma load current: 200mv z high output voltage accuracy: 1.5% z high power supply rejection ratio: 68db@1khz z low output noise: 150vrms z low quiescent current: 72a (one channel 46a)
product brief CP2168 v1.0 led driver series high efficiency 1x/1.5x fractional charge pump for white led (pwm brightness control) with dual channel 200ma ldo copyright ?2008 chiphomer technology limited 2 z stable with 0.47f ceramic capacitor z fast turn on:50s z output voltage range 1.0v~3.3v z using two en pin to control each ldo pin diagram (top view) vin2 c2+ c1+ c1- c2- vout1 en4 1 2 3 4 5 15 14 13 12 11 vin vout2 applications y cellular/gsm/phs phones y digital cameras y pdas, mp3 players y portable, battery powered equi pments, portable computers
product brief CP2168 v1.0 led driver series high efficiency 1x/1.5x fractional charge pump for white led (pwm brightness control) with dual channel 200ma ldo copyright ?2008 chiphomer technology limited 3 typical application chiphomer technology limited add: 4f, building d, 1618 yishan road, shanghai, p.r.c. tel: +86-(0)21-64058488, 64014543 fax: +86-(0)21-64050030 email: sales@chiphomer.com web: www.chiphomer.com shenzhen office: 10d, building 2, dushi yangguang garden chegongmi ao, futian district, shenzhen, 518048, p.r.c. tel: (86)755-82046706, 82047789 fax: (86)755-82046709
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