Analog Devices Inc.

Demonstration circuit 1326A consists of three voltage regulators; a synchronous boost, a synchronous buck and a linear LDO. Jumpers are provided for selecting a total of nine output voltages (3 boost output voltages: 1.8V/3.3V/5V, 3 buck output voltages: 1.2V/1.5V/1.8V, and 3 LDO output voltages: 1.5V/2.85V/3V). The high efficiency DC/DC converters feature 700mA switches for the boost, 250mA for the buck and a 100mA rating for the LDO regulator. With a light load, the boost converter can startup with an input voltage as low as 700mV and once started, the input can go as low as 500mV while maintaining a regulated output. That maximum boost and buck input voltage is 5.5V. The buck converter requires 1.8V minimum input.

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