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美国国家半导体公司宣布推出两款可在停机后将输入及输出隔离的固定频率、电流模式控制升压直流／直流转换器LM3502及LM3503，这两款器件有小巧的10焊球micro SMD及小型的16引脚LLP两种封装可供选择。 LM3502及LM3503可为便携式电子产品的单一大显示屏幕或多个显示屏幕提供40V的输出电压，以驱动10个、并以一组或分为两组的方式串行的白光或蓝光发光二极管。任何一串发光二极管都可独立启动或关闭，此外，全部发光二极管也可同时启动或关闭。提
National Semiconductor Corp. announced two LM3502 and LM3503 fixed-frequency, current-mode-controlled step-up DC / DC converters that shut down input and output. These devices feature a compact 10-bump micro SMD and a small Available in 16-lead LLP packages. The LM3502 and LM3503 provide a 40V output voltage for a single large display screen or multiple display screens in portable electronics to drive up to 10 white or blue LEDs in series or in groups. Any string of LEDs can be turned on or off independently, and all LEDs can be turned on or off at the same time. mention