There are some applications, such as double-ended sensors and audio
amplifiers that require a negative voltage for operation. With limited
space on today’s system boards, creating a dedicated negative supply
rail would add to the cost and space of the PCB. Hence, it makes sense
to generate the required negative voltage from existing positive supply
rails in the system.
One such solution using a traditional synchronous step-down regulator is
provided by Texas Instruments in an application note entitled “Creating
an Inverting Power Supply Using a Synchronous Step-Down Regulator”1. It
shows you how to generate a negative voltage from a positive input
voltage to the synchronous buck regulator. [Link]
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