While single-supply rail-to-rail op amps are widely used, it is often necessary to generate two rails from a single (positive) input rail to power other parts of the analog signal chain. These parts are typically low current with relatively well-matched loads on the positive and negative supplies. This article proposes an alternative to the common solution, using a SEPIC-Cuk converter consisting of a Cuk converter with an unregulated output connected to the switch node of a SEPIC converter with a regulated output. This combination produces two high-efficiency supplies that keep very close track of each other under almost all conditions.
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