I'm designing a circuit to provide a negative voltage rail in a battery for an ADC. I've decided to use a particular monolithic BCD Chip that can work as a step up/down/inverting controller and has an integrated switch.
I've designed the circuit inline with the data sheet inverting reference with the exception of using tantalums, a different shottky (30V 1A) and have a higher input voltage. At this point it doesn't appear that the circuit is switching (at all) from what I can tell, there is no oscillation on the timing cap pin or output, and Vout is measuring around +.3V. The chip is commanding 3W of energy which it appears to be dissipating itself.
Have I missed something here. I've substituted all components, so this is likely a design or layout issue I think.