National Semiconductor LM3668SD-4550EV Board Type: Fully Populated Current - Output: 1A Frequency - Switching: 2.2MHz Main Purpose: DC/DC, Step Up or Down Outputs And Type: 1, Non-Isolated Power - Output: - Regulator Topology: Buck-Boost Series: PowerWise?® Utilized Ic / Part: LM3668 Voltage - Input: 2.5 ~ 5.5V Voltage - Output: 3.3V