The buck-boost configurationnf the MAX634 is well suited for dual output de-de converters. Only a second winding on the inductor is needed. Typically, this second winding is bifilar-primary and secondary are wound simultaneously using two wires in parallel. The inductor core is usually a toroid or a pot core. The negative output voltage is fully regulated by the MAX634.
Dual-output-dc-dc-converter - schematic

The positive voltage is semiregulated, and will vary slightly with load changes on either the positive or negative outputs.

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