Introduction
This user’s guide contains background information for the NN31001A : 7A Synchronous DC-DC Step Down Regulator(1ch),Power Supply in Package (PSiP) which integrates a Controller IC that employs a hysteretic control system, two Power MOSFETs, an Inductor and Capacitors into a single QFN package.
as well as support documentation for the NN31001A Evaluation Board (NN31001A-EVB). Also included are the appearance , the pin function , the test set-up , the schematic , the bill of materials and the board layout for the Evaluation Board.

Overview
NN31001A is a synchronous DC-DC Step Down Regulator (1-ch) Power Supply in Package (PSiP), which integrates a Controller IC that employs a hysteretic control system, two Power MOSFETs, an Inductor and Capacitors into a single 8.5 x 7.5 x 4.7 mm QFN package. The easiness of mounting PSiP onto Printed Circuit Board (PCB), a very small footprint and a highly reduced number of external components, offers very compact and simplified solutions for applications requiring point-of-load design. The number of external components have been reduced to only input / output capacitor, slow start capacitor and feedback resistors. Furthermore, for applications requiring an output voltage of 1.0V / 3.3V, the external feedback resistors can be eliminated, resulting into even a smaller footprint.
The PSiP achieves efficiencies of greater than 94% with very good power dissipation capabilities.