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发布者:微桥 发布时间:2010/1/9 阅读:6942次    关键字: PT4412
PT4412-微型4通道低压差电流源


PT4412-Tiny Package 4 Channel Low Dropout Current Source PDF文档下载

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
 

¨          No external component required

¨          Fixed 20mA and 15mA sinking current

¨          Individual current sink circuit for each output to prevent short/open circuit on LEDs

¨          PTC LED current for luminosity compensation

¨          4 channels available

¨          PWM tuned LED brightness through EN pin

¨          Supply voltage range 2.7V~6.0V

¨          0.1uA standby current
 
APPLICATIONS
 

¨          Small Size Color LCD Backlights

¨          Mobile Phone, Smart Phone, PDA etc. Backlights
 
TYPICAL APPLICATIONS

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