簡介

　　高效率往往是電力的主要目標便攜式計算機和手持設備中的供應品。高效轉換器是必要的，在這些應用程序減少輸入源（電池等）的功率損耗和熱量積聚在電源組件，允許更小，更輕，壽命更長的系統。電源轉換效率必須在90%范圍內才能滿足這些目標。本應用筆記功能電源滿足這些設計要求并達到的電路高效率在較寬的工作范圍。

　　The recent development of the LTC? 1142， LTC1143， LTC1147， LTC1148， and LTC1149 makes ultra-high efficiency conversion possible. In addition， the LTC1148， LTC1149， and LTC1142 are synchronous switching regulators， achieving high efficiency conversion at output currents in excess of 10A. These controllers feature a current mode architecture that has automatic Burst ModeTM operation at low currents. This technology makes 90% efficiencies possible at output currents as low as 10mA， maximizing battery life while a product is in sleep or standby mode.

　　These ultra-high efficiency converters also implement constant off-time architecture， fully synchronous switching and low dropout regulation. All these features make this series of converters a really excellent choice for a vast variety of applications.

　　Achieving high efficiency is one of the primary goals of switching regulator design. Every application circuit shown in this note includes detailed efficiency graphs. Almost all of the magnetic parts used in the circuits are standard products， available off-the-shelf from various manufacturers.