SNVA962 December   2020 TPSM5601R5H

 

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1.1 Concept

In a standard buck module configuration, the positive output connection (VOUT) is connected to the internal inductor and the return connection is to the device ground (PGND).

In the IBB configuration, the system ground (SYS_GND) is connected to the VOUT of the device and the device return path is now the negative output voltage (-VOUT). Therefore, the buck output is now the system ground, and the buck "ground" becomes the negative output voltage. This shift in topology allows the output voltage to be inverted (with respect to the input voltage).