Synchronous DC-DC Controller features single supply operation.

Press Release Summary:

Model MIC2165 features architecture that makes high delta-V operation with VIN of 28 V and VOUT of 0.8 V possible. Unit employs Hyper Light Load(TM) feature to achieve high efficiencies at light loads. Operating over input supply range of 4.5-28 V, it can provide up to 25 A of output current, achieves up to 95% efficiency, and has short current sensing on bottom MOSFET. Unit also features internal linear regulator that provides regulated 5 V to power internal control circuitry.

Original Press Release:

Micrel Introduces Hyper Light Load(TM) efficient Synchronous DC-DC Controller with Single Supply Operation

San Jose, Calif. - Micrel Inc., (Nasdaq:MCRL), an industry leader in analog, high bandwidth communications and Ethernet IC solutions, today introduced the MIC2165, a Hyper Light Load(TM) efficient, adaptive on-time, synchronous DC-DC controller. The device features an architecture that significantly reduces the required output capacitance and allows for excellent transient response, while making high delta-V operation (VIN=28V, VOUT=0.8V) possible. The MIC2165 employs a Hyper Light Load feature to achieve very high efficiencies at light load conditions. Also built into MIC2165 are a power good signal and an internal VDD regulator that enables single-supply operation. The solution is ideal for applications that require very low standby power dissipation such as set-top boxes, gateways, routers, computing peripherals, servers, processor core supply and low-voltage distributed power supplies. The MIC2165 is currently available in volume quantities with pricing starting at $1.00 for 1K quantity. Samples can be ordered on line at:

"A host of customer-friendly features such as internal 5V VDD regulator and power good output, combined with Micrel's Hyper Light Load(TM) efficiency offer terrific benefits including reduced BOM cost and world class efficiency," stated Doyle Slack, director of analog marketing, Micrel. "The huge advantage gained by our Hyper Light Load is very high efficiency at light load conditions. This results in minimal power loss during standby modes."

The MIC2165 operates at 600kHz switching frequency and can be used to provide up to 25A of output current. The device achieves up to 95 percent efficiency, while still switching at high frequencies over a broad load range. The MIC2165 operates over an input supply range of 4.5V to 28V. The device has an internal linear regulator which provides a regulated 5V to power the internal control circuitry. An UVLO feature is provided to ensure proper operation under power-sag conditions to prevent the external power MOSFET from overheating. A digital soft start feature is provided to reduce the inrush current. Short current sensing on the bottom MOSFET, with hiccup, ensures protection in case of output short circuit. The MIC2165 includes an enable (EN) input to shutdown the converter and a power good output that allows simple sequencing. The device is stable with all output capacitors (zero to high ESR). The MIC2165 is available in a 10-pin MSOP ePad package with a junction operating range from -40°C to +125°C.

About Micrel

Micrel Inc. is a leading global manufacturer of high performance analog and high-speed mixed signal solutions. The Company's products include advanced mixed-signal, analog and power semiconductors; high performance communication, clock management, Ethernet switch and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe and Asia. In addition, the Company maintains an extensive network of distributors and sales representatives worldwide.

For further information, contact Julieanne DiBene at: Micrel, Incorporated, 2180 Fortune Drive, San Jose, California 95131, (408) 944-0800; or visit the Micrel website at:

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