Do all switching converter ICs support multiple topologies?

Question

I'm trying to design a low-noise power supply for small-signal audio (+/-12-15V, ~1A). As part of this, I'm investigating advanced SMPS topologies like the SEPIC and Ćuk converters. Few controller/converter ICs mention support for these topologies in their datasheets, and the ones that do (such as the LM5001) seem to support a more common topology as well, usually boost. I also found an EE Times article on how to design a negative buck converter using a boost converter IC, and an app note that implements a buck-boost converter using a buck converter IC. What I have not found is a general list of which topologies are supported by each type of controller/converter. Thus, I have two questions:

1. Can all converter ICs be used to implement multiple topologies?

2. If so, which topologies are supported by each type of basic converter IC (buck, boost, etc.)?

Answer 1

An SMPS controller¹ IC may support multiple converter topologies. But a single IC almost never supports all common converter types.

There is a family of converters derived from boost converter: flyback, SEPIC, boost proper. A controller that can do boost, usually can do the rest of the boost family too. Usually, one controller can't do both buck family and boost family.

¹ SMPS controller IC drives external power switches. SMPS converter IC has power switches on board. Converter ICs tend to be less versatile than controllers.