Buck regulator with monolithic N- channel upper FET and pilot current sensing

摘要

A power switching stage architecture for a buck topology-based, DCDC converter includes an upper power switching N-channel device FET integrated in the same semiconductor circuit chip with the switching driver, while a lower power switching is also an N-channel FET, but is external to the driver chip. Either of the two power switching FETs may be configured to include a pilot FET cell, to facilitate current sensing for the controller.