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Integrated MOSFET buck regulators for PoL applications

Micrel has rolled out its SuperSwitcher II family of integrated MOSFET buck regulators for high power density DC/DC applications. The MIC26xxx family comprises six DC/DC buck regulators leveraging the company’s proprietary HyperSpeed Control and HyperLight Load architecture, which refer to the fast load transient response and the ability to maintain high efficiency even at light loads, respectively. The HyperSpeed Control architecture employs a digitally modified, adaptive on-time control and ripple injection technique. The HyperLight Load architecture provides the same performance as HyperSpeed Control when operating under heavy loads. These architectures make company’s DC/DC regulators and controllers suitable for PoL applications requiring tight tolerance and fast transient response, claims the company.The MIC26601/901/1201 and the MIC26603/903/1203 operate with an input supply voltage range from 4.5 to 28V, and deliver an output current of 6, 9 and 12A, respectively. According to the company, the regulators have been tailored to be Any Capacitor stable, independent of the output capacitance equivalent series resistance, thus solving the perpetual problem of stability that power designers face when dealing with distributed output capacitance. The buck regulators can drive DC/DC loads operate at 600kHz switching frequency with ±1% output voltage accuracy; the output is adjustable down to 0.8V. The regulators have an onboard 5V regulator allowing single-supply operation, an enable pin for very low power shutdown, internal soft start, under-voltage lockout, and internal compensation, in addition to a host of protection features such as pre-bias safe startup, over-temperature protection, fold-back current limit and short circuit protection, says the company. The regulators are available in a lead-free, 28-lead 5x6mm microleadframe package.