The TPS50601A-SP device is an upgraded version of the TPS50601-SP device in the same package. The TPS50601A-SP improved the radiation performance as well as improved the reference voltage accuracy over the TPS50601-SP. The TPS50601A-SP switched the high-side MOSFET to a pFET to allow for a reference capacitor to help improve the reference voltage accuracy. The TPS50601A-SP also had process improvements that allowed the improved radiation performance. There was also the inclusion of more bond wires for PVIN, PGND, and PH pins that allowed the TPS50601A-SP to have higher efficiency than the TPS50601-SP.