This reference design utilizes the LM61495 synchronous buck regulator, with internal top and bottom FETs, which is configured as a synchronous inverting buck-boost converter. The design generates an output of –8 V, capable of delivering 2.7-A continuous (4-A peak) of current to the load, from a +12 V, ±10% input. The design is built on the PMP23241A PCB, which is a 4-layer board with 1-oz copper for each of the four layers. The board is 76.2 mm × 68.6 mm. The actual design size is approximately 17.0 mm × 30.5 mm, excluding the input bulk capacitor, C1.