The SP6644/6645 Evaluation Board is designed to help the user evaluate the performance of the SP6644/6645 for use as a single or dual cell input to +3.3V output DC-DC Converter. The output of the SP6644/6645 is preset to +3.3V or can be adjusted from +2V to +5.5V by manipulating two external resistors. The SP6644/6645UEB evaluation board is a complete power supply circuit with an option for adding a small SOT23 5-pin +3V LDO Regulator to provide even better regulation and low noise output. The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP6644/6645 Inputs and Outputs so that the user can quickly connect and measure electrical characteristics and waveforms. The next two sections describe the SP6644/6645 Board Layout and Using the SP6644/6645 Evaluation Boards. Power Supply Data is supplied as measured from a typical SP6644/6645 evaluation board. The SP6644/6645 Evaluation Board List of Materials table is provided with some manufacturers part numbers to use as a reference. Finally, a schematic and drawings of the PC Layout are included as a design-in tool for the user of the SP6644/6645. BOARD LAYOUT