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The MCP1253-ADJ is an inductorless, positive regulating, low noise charge pump DC-to-DC converter. It has an adjustable output of either 1.5V to 5.0V and can deliver 120mA of load current at the desired regulated output voltage. Since the device incorporates an automatic buck/boost feature, it will maintain the regulated output voltage whether the input voltage is above or below the output voltage
it is "programmable" with 2 resistors you put between the vout and the fb pin
then you have VOUT = 1.21V (1 + R1/R2)
see the typical applcation schematic in the datasheet.
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