Datasheet AK7864A (Asahi Kasei Microdevices) - 2

[AK7864A]
Block Diagram
CP1 CPO VDD CPOUT LED_R LED_G LED_B (3.3V±5%) SW CONT_B SW CONT_G SW CONT_R CP Charge Current Pump EN Current CC Setting (VDD2) Source R 8 step CN Current Source G Current PDN Source B VSS IREF R 1%
Circuit Block Description
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Charge Pump Circuit
A necessary voltage for LED (Vf 4.8V or less) lighting is generated from the voltage supplied to VDD pin. Please supply the generated voltage from CPOUT pin to external LED. 
LED Driver Part
This product has 3 channel LED driver to drive RGB constant current. Use the ON/ OFF digital terminal to control the constant current. The current setting can be set to 8 levels (100%/87.5%/75%/62.5%/50%/37.5%/25%/12.5%) with CONT_R/G/B and EN combination. The current of 3 channels are same. It is possible to light 1ch or 3ch simultaneously. Please set the LED current less than 50% by 3ch simultaneously. MS1336 - E - 00 2 2012/01