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無錫硅動力推出SP1221F，低功耗，外置MOS，PWM控制器，自搭配MOS，最大電流可做到8A 

Features 

?  Wide VIN Range：9V to 40V   
?  ± 2.0% 1.0V Reference   
?  Dual-Channeling CC/CV Mode Control 
?  External Current Limit Setting for 2 channel 
?  Internal Soft Start 3ms 
?  Fixed Frequency 120 KHz for easy EMI design 
?  UVLO Protection(min=7V,typ=7.5V,max=8V) 
?  Duty Cycle Range (0~95%) 
?  Single Pin to External Compensation and Shutdown Control 
?  COUT MLCC support 
?  Built in Adjustable Line-Compensation 
?  Over Temperature Protection,Output Overvoltage Protection, Output Over current Protection, Short Circuit Protection 
?  MSOP-10L Package 
Applications 
?  Car Chargers   
?  High-Brightness Lighting 
?  Portable Charger Devices   
?  General-Purpose DC/DC Converters with Current Limit 
General Description 
         SP1221F  is a  synchronous buck  controller.  It is designed to allow for operating a wide supply voltage range from 9V to 40V. It can drive dual output current to 8A  (4A+4A). The external shutdown function can be controlled by logic level to pull COMP/EN pin down, and then comes into standby mode.  The external compensation makes feedback control have good line and load regulation with flexible external design. 
         SP1221F operates in the Constant output Current mode or Constant output Voltage mode, and the OCP current value is set by current sensing resisters. 
         SP1221F offers comprehensive protection with output over current, output short circuit, output over voltage, over temperature. 
         SP1221F  is offered in MSOP-10L packages and require very few external devices for operation.