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 :-).


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