The LM25088 high voltage non-synchronous buck controllerfeatures all the necessary functions to implement an efficienthigh voltage buck converter using a minimum number of externalcomponents. The LM25088 can be configured to operateover an ultra-wide input voltage range of 4.5V to 42V.This easy to use controller includes a level shifted gate drivercapable of controlling an external N-channel buck switch. Thecontrol method is based upon peak current mode control utilizingan emulated current ramp. The use of an emulatedcontrol ramp reduces noise sensitivity of the pulse-width modulationcircuit, allowing reliable control of very small dutycycles necessary in high input voltage/low output voltage applications.The LM25088 switching frequency is programmablefrom 50 kHz to 1 MHz.
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