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SiC414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

关键词： 稳压 技术 电源 6A SiC414 设计 基于