1MHz 10A Current-mode DC-to-DC Converter

This monolithic buck switching regulator circuit is built on a SOV BiCMOS process that features isolated DMOS, CMOS and bipolar devices with 5μm minimum feature size. The maximum operating frequency is 1MHz, the operating supply voltage range is 9V to 60V, with a peak current limit set to 12A. This translates to a lOA maximum output current in a buck converter configuration. The circuit is capable of operating in current or voltage-mode by pin-programming. The voltagemode operation is somewhat faster, yielding lOOns minimum controlled on-time, i.e. 10% minimum duty-cycle at 1MHz. In current-mode the minimum on-time is 200ns. The current mode enables the paralleling of regulators to increase the output current and also increase system reliability by redundant design.