ADM660
Production
The ADM660 / ADM8660 is a charge-pump voltage converter that can be used to either invert the input supply voltage giving VOUT = -VIN or double it (ADM660...
Datasheet
ADM660 on Analog.com
MAX660
Production
The MAX660 monolithic, charge-pump voltage inverter converts a +1.5V to +5.5V input to a corresponding-1.5V to -5.5V output. Using only two low-costcapacitors...
Datasheet
MAX660 on Analog.com
LTC660
Production
The LTC660 is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range...
Datasheet
LTC660 on Analog.com
The datasheets of all x660 voltage inverters like the ADM660, MAX660, LTC660 are quite clear that the OSC input can only be driven in inverter mode and not in votlage doubler mode. I am aware that the OSC pin and its internal current sources are referenced to LV on the low side and V+ on the high side. I would assume that with proper level shifting (swing between LV and V+?) one should still be able to overdrive the oscillator. Is there anything else that would prevent that?