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Digital PWM controller for high current, DC/DC power supplies

Posted: 23 Dec 2013     Print Version  Bookmark and Share

Keywords:Micrel  DC/DC power supplies  DC/DC power supplies  IntelliMOS 

Micrel Inc. has announced what it describes as a true-digital PWM controller for high-current, non-isolated DC/DC power supplies in computing and telecom applications. Aimed to work with an external industry standard DrMOS as well as Micrel's proprietary IntelliMOS solution, the MIC21000 can be used as a flexible building block for 12V or 5V step-down, high current point-of-load power supplies.

The MIC21000 integrates a digital control loop, optimized for maximum flexibility and stability, as well as for load transient and steady state performance. The device's ultra-fast transient response reduces the output capacitance, added the firm. The non-linear control feature improves transient response by a factor of two versus competing analog solutions. Highly-reliable fuse-based, on-board nonvolatile memory (OTP NVM) and I2C/PMBUS interface enable user configuration and communication with a supervisory controller for monitoring and fault management. This allows for rapid power subsystem development and debugging which, in turn, accelerates time to market.

The I2C/ PMBUS interface allows for real time monitoring of input voltage, output voltage/current and internal/external temperature. The MIC21000 can operate from a single bias supply voltage of 5V or 3.3V. A full suite of power management features eliminates the need for complicated and expensive sequencing and monitoring of the IC. The MIC21000 can be configured by using the Micrel Digital Designer GUI during development that claims to provide an easy-to-use interface for communication and configuration. The device can also be reconfigured with PMBUS commands during runtime.

The MIC21000 is available in a compact 24-pin 4 x 4mm QFN package with an operating temperature range from -40°C to 85°C. It is available in volume quantity with 1,000 quantity pricing starting at $3.75.

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