Abstract: Switch-mode regulators and methods providing transient response speed-up in the presence of large load transients. Speed-up is achieved by coupling a first MOSFET switch between the regulator output and the input voltage and a second MOSFET switch between the regulator output and the circuit common connection. During normal operation these MOSFETs are off, but in the event of a large load transient substantially disturbing the regulator output, one of the MOSFETs is momentarily turned on to couple the regulator output to the input voltage or circuit ground as appropriate to bring the regulator output within a narrow range around the nominal output voltage. Operation of the MOSFETs is disabled on startup until the regulator output is within a predefined range, and whenever the regulator output exceeds a limit range indicative of a fault condition.

Abstract: Multiple battery switchover circuits for selective interconnecting any one of multiple batteries to a load or a charger while maintaining isolation with other batteries of the system. The present invention maintains the required isolation and interconnection capabilities using only three MOSFETs per battery instead of the four required by the prior art. The three MOSFETs for any one battery in the switchover circuit are connected with one current carrying connection in common, with the other current carrying connection of the MOSFETs being coupled to the charger, the load and a respective battery, respectively. Appropriate connection of the MOSFETs assures that as to any possible conduction path through two of the three MOSFETs, one of the MOSFETs has its parasitic diode back biased. Alternate embodiments are disclosed.