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Demonstration circuit 1921A is a digitally programmable 8-output power supply with a pushbutton controller and watchdog timer, featuring the LTC3375. The LTC3375 has eight synchronous buck regulators, each with an independent VIN supply. The buck regulators may be paralleled together to create a higher power buck regulator with a single inductor. The input range of the LTC3375 is ideal for single cell Li-Ion/Polymer battery applications. The switching regulator settings, such as enables, feedback voltages, operating modes, phasing and other functions, can be controlled via I2C. The buck regulators can also be enabled via external precision threshold enable pins to allow hardwired power-up sequences.