LM5118

LM5118 LM5118/LM5118Q Wide Voltage Range Buck-Boost Controller www.DataSheet.net/ Literature Number: SNVS566F Datasheet pdf - http://www.DataSheet4U.co.kr/ LM5118/LM5118Q Wide Voltage Range Buck-Boost Controller October 17, 2011 LM5118/LM5118Q Wide Voltage Range Buck-Boost Controller General Description The LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high performance, cost efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost 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 LM5118 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 dual mode 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 regulator’s control method is based upon current mode control utilizing an emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in ...