We often require power sources with negative output voltages. There are many different ways to produce a negative output voltage from a positive input voltage. One option is a polarity-inverting buck-boost converter. The advantages of this topology are that it requires low component count and that it can be built with standard high-side regulator ICs such as those intended for buck regulators. The LM4360x and LM4600x synchronous family of SIMPLE SWITCHER® converters can be used in an inverting buck-boost topology to provide a regulated negative output voltage rail in the system.
This user guide will demonstrate the use of LM46002 in an inverting buck-boost application. The design accepts an input voltage of 15 V to 45 V and can provide an output voltage of -15 V capable of supplying a range of output current to the load up to 1 A.