原标题：Vishay SiC414 6A降压电源稳压方案

　　Vishay 公司的SiC414是集成了5V/200mA LDO的6A降压电源稳压器,开关频率高达1MHz,全部采用陶瓷电容.连续输出电流达6A,效率大于95%,内部软起动和软关断,主要用在笔记本电脑,台式电脑和服务器,数字HDTV和消费类电子,网络和通信设备,打印机,DSL和STB,嵌入式应用和点负载电源.本文介绍了SiC414主要特性, 功能方框图, 典型应用电路图和SiC414评估板电路图以及材料清单(BOM).

　　The Vishay Siliconix SiC414 is an advanced stand-alone synchronous buck regulator featuring integrated power MOSFETs, bootstrap diode, and an internal 5 V LDO in a space-saving MLPQ 4 x 4 - 28 pin package.

　　The SiC414 is capable of operating with all ceramic solutions and switching frequencies up to 1 MHz. The programmable frequency, synchronous operation and selectable power-save allow operation at high efficiency across the full range of load current. The internal LDO may be used to supply 5 V for the gate drive circuits or it may be bypassed with an external 5 V for optimum efficiency and used to drive external n-channel MOSFETs or other loads. Additional features include cycle-by-cycle current limit, voltage softstart, under-voltage protection, programmable over-current protection, soft shutdown and selectable power-save. The Vishay Siliconix SiC414 also provides an enable input and a power good output.

　　SiC414主要特性:

　　• High efficiency > 95 %

　　• 6 A continuous output current capability

　　• Integrated bootstrap switch

　　• Integrated 5 V/200 mA LDO with bypass logic

　　• Temperature compensated current limit

　　• Pseudo fixed-frequency adaptive on-time control

　　• All ceramic solution enabled

　　• Programmable input UVLO threshold

　　• Independent enable pin for switcher and LDO

　　• Selectable ultra-sonic power-save mode

　　• Internal soft-start and soft-shutdown

　　• 1 % internal reference voltage

　　• Power good output and over voltage protection

　　• Halogen-free according to IEC 61249-2-21 definition

　　• Compliant to RoHS directive 2002/95/EC

　　SiC414应用:

　　• Notebook, desktop and server computers

　　• Digital HDTV and digital consumer applications

　　• Networking and telecommunication equipment

　　• Printers, DSL and STB applications

　　• Embedded applications

　　• Point of load power supplies

　　图1.SiC414功能方框图

　　图2.SiC414典型应用电路图

　　图3.SiC414评估板电路图

　　SiC414评估板材料清单(BOM):