Buck regulators operate at 600kHz switching frequency

Micrel Inc. has announced its SuperSwitcher II family of integrated MOSFET buck regulators for high power density DC/DC applications. The MIC26xxx family includes six DC/DC buck regulators that use the company's proprietary HyperSpeed Control and HyperLight Load architecture. According to Micrel, the devices target distributed power systems, communications networking and infrastructure, and industrial applications.

The MIC26601/901/1201 and the MIC26603/903/1203 operate with an input supply voltage range from 4.5-28V, and deliver an output current of 6A, 9A and 12A, respectively. The SuperSwitcher II family has been tailored to be Any Capacitor stable, independent of the output capacitance Equivalent Series Resistance (ESR). This solves the problem of stability that power designers face when dealing with distributed output capacitance. The SuperSwitcher II family of buck regulators can drive DC/DC loads at more than 95 percent efficiency and operate at 600kHz switching frequency with ±1 percent output voltage accuracy, noted the company. In addition, the output of the devices is adjustable down to 0.8V.

The SuperSwitcher II devices have an onboard 5V regulator allowing single-supply operation, an enable pin for very low power shutdown, internal soft start, undervoltage lockout, and internal compensation. It also touts many protection features such as pre-bias safe startup, overtemperature protection, fold-back current limit and short circuit protection. The MIC26601/901/1201 and the MIC26603/903/1203 buck regulators are available in a thermally enhanced lead-free 28-Lead 5 x 6mm MLF package. The products are available in volume quantities, with 1,000 quantity pricing starting at $1.58/$1.74/$1.88 and $1.62/$1.77/$1.92, respectively.