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Demonstration circuit 2558A is a high voltage switching buck regulator, Li-Ion cell charger and power backup manager. It is based on the LTC4091 and provides the following functions: 2A buck regulator with 7.5V-36V (60V absolute max) input range and with output voltage tracking cell voltage, full-featured cell charger with selectable 4.1V or 4.2V maximum charge voltage, and a power path manager for the cell. Output voltage is strictly limited to 4.45V. Temperature protection is optional with an external NTC temperature sensor.