四通道,固定电流20mA和15mA,无外围器件LED驱动器,支持脉宽调光PT4412

 PT4412_DS Rev EN_2.0 PT4412 GENERAL DESCRIPTION The PT4412 is a series of White/Blue LED drivers. There is no external component needed, which helps to lower the system cost significantly. The circuit is optimized to provide over 90% efficiency. The PT4412 is ideal to drive white LEDs used for Li-ion battery powered LCD displays. The LED brightness can be adjusted in real time through a PWM signal at the EN pin. The target end applications are small color LCD displays in mobile phones, smart phone, digital cameras, PDA etc. PT4412 is available in SOT23-6 package. FEATURES z No external component required z Fixed 20mA and 15mA sinking current z Individual current sink circuit for each output to prevent short/open circuit on LEDs z PTC LED current for luminosity compensation z 4 channels available z PWM tuned LED brightness through EN pin z Supply voltage range 2.7V~6.0V z 0.1uA standby current z RoHS compliant APPLICATIONS z Small Size Color LCD Backlights z Mobile Phone, Smart Phon e, PDA etc. Backlights    
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