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Buck controller suits low voltage, distributed power apps

Posted: 26 Jul 2010     Print Version  Bookmark and Share

Keywords:DC/DC controller  regulator  power supply  single-supply 

Micrel Inc. adds MIC2166, to its family of Hyper Speed Control Synchronous DC/DC controllers with a wide input voltage range, and a built-in 5V VDD regulator that enables single-supply operation. This adaptive on-time device is capable of driving up to 25A of load current.

It operates at 600kHz switching frequency and over a supply range of 4.5V to 28V. The device achieves up to 95 per cent efficiency, while still switching at high frequencies over a broad load range.

An UVLO feature is provided to ensure proper operation under power-sag conditions which prevents the external power MOSFET from overheating. A digital soft start feature is included to reduce the inrush current. Short Current Sensing on the Bottom MOSFET with hiccup ensures protection in case of output short circuit. The MIC2166 includes an enable (EN) input to shutdown the converter and a Power Good output that allows simple sequencing. The device is stable with any output capacitor (zero to high ESR).

Applications include set-top boxes, gateways, routers, computer peripherals, and applications with low voltage distributed power requirements.

The MIC2166 is available in a 10-pin ePad MSOP package with a junction operating range from –40°C to +125°C.

Prices start at Rs.43.43 ($0.93) each for an order of 1,000 units.

- Ismini Scouras
EE Times





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