What SMPS topology is this?
Not sure what to call the topology, but the circuit appears to be designed to boost a very low voltage at high current to a usable level.  A diode drop from a conventional topology represents a large efficiency loss when in the realm of low voltage power sources.  You can see from the circuit that the device has a 1-volt input, so its switches have to be timed to turn off and on to direct and block the flow of current to perform a similar function as the diodes would in a topology with high voltage.  You can see that if timed properly, the output voltage will be greater than the input, but even a single diode drop in a switcher would drop your efficiency in half or more at one volt input.  The output appears to be AC; is this correct?