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SNVS726F – JULY 2011 – REVISED MARCH 2018 LM25118 Wide Voltage Range Buck-Boost Controller
1 Features 3 Description The LM25118 wide voltage range Buck-Boost
switching regulator controller features all of the
functions necessary to implement a highperformance, cost-efficient Buck-Boost regulator
using a minimum of external components. The BuckBoost topology maintains output voltage regulation
when the input voltage is either less than or greater
than the output voltage making it especially suitable
for automotive applications. The LM25118 operates
as a buck regulator while the input voltage is
sufficiently greater than the regulated output voltage
and gradually transitions to the buck-boost mode as
the input voltage approaches the output. This dualmode approach maintains regulation over a wide
range of input voltages with optimal conversion
efficiency in the buck mode and a glitch-free output
during mode transitions. This easy-to-use controller
includes drivers for the high-side buck MOSFET and
the low-side boost MOSFET. The control method of …