资 源 简 介
The LM5118 wide voltage range Buck-Boost switching regulatorcontroller features all of the funcTIons necessary to implementa high performance, cost efficient Buck-Boostregulator using a minimum of external components. TheBuck-Boost topology maintains output voltage regulaTIonwhen the input voltage is either less than or greater than theoutput voltage making it especially suitable for automoTIveapplicaTIons. The LM5118 operates as a buck regulator whilethe input voltage is sufficiently greater than the regulated outputvoltage and gradually transitions to the buck-boost modeas the input voltage approaches the output. This dual modeapproach maintains regulation over a wide range of inputvoltages with optimal conversion efficiency in the buck modeand a glitch-free output during mode transitions. This easy touse controller includes drivers for the high side buck MOSFETand the low side boost MOSFET. The regulator’s controlmethod is based upon current mode control utilizing an emulatedcurrent ramp. Emulated current mode control reducesnoise sensitivity of the pulse-width modulation circuit, allowingreliable control of the very small duty cycles necessary inhigh input voltage applications. Additional protection featuresinclude current limit, thermal shutdown and an enable input.The device is available in a power enhanced TSSOP-20package featuring an exposed die attach pad to aid thermaldissipation.
