The MIC261203 from Micrel is a constant-frequency, synchronous DC-DC buck regulator featuring adaptive on-time control architecture. It operates over a supply range of 4,5 V to 28 V and has an internal linear regulator which provides a regulated 5 V to power the internal control circuitry.
The device operates at a constant 600 kHz switching frequency in continuous-conduction mode and can be used to provide up to 12 A of output current at an output voltage adjustable down to 0,8 V.
Micrel’s HyperLight Load architecture provides the same high efficiency and ultra-fast transient response as its Hyper Speed Control architecture under medium to heavy loads, but also maintains high efficiency under light load conditions by transitioning to variable frequency, discontinuous mode operation.
The MIC261203 offers a full suite of protection features to ensure protection of the IC during fault conditions. These include under-voltage lockout to ensure proper operation under power-sag conditions, thermal shutdown, internal soft start to reduce the inrush current, foldback current-limit and hiccup mode short-circuit protection. The IC includes a ‘power good’ output to allow simple sequencing.
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