The LTC7149 has an inverting regulator operating from an input voltage range of 3.4V to 60V. The LTC3649 has an input voltage range of 3.1V to 60V. The LTC3623 and LTC3600 have operating voltage ranges of 4V to 15V.
Analog Devices Inc. LTC7149 and LTC3649 offer a peak current mode architecture that allows for fast transient response with inherent cycle-to-cycle current limit protection. LTC3623 and LTC3600 has operating frequency from 200kHz to 4MHz, and has unique constant on-time architecture that is ideal for high step-down ratio applications.