Post by thread:[EE] Synchronous super high efficiency buck-boost

LTC3780 - for those who want the (near) ultimate in buck boost efficiency Introduction http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1042,C1116,P10090 Full data sheet (28 page pdf)(may need cut and paste) http://www.linear.com/pc/downloadDocument.do;jsessionid=CLat1jNoQukRlkcXlPvGoi1WbH5C1dqTlJYw8Aa2hsTh3wdsPKyC!564212589?navId=H0,C1,C1003,C1042,C1116,P10090,D7197 At 12v, 5A out, efficiency is > 95% for Vin of 7 volts to 30 volts and over 90% from 5 volts to 30 volts. 98% at 15V in. The price is high parts external count - 4 FET switches, and almost 20 other parts. Many good features. Uses 4 N channel FETs with internally generated high side supply, load is disconnected when off. RM The 6.8 uF inductor specified in the final circuit in the data sheet note may be hard to find :-).