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Micrel Introduces 20 A IntelliMOS Power Stage Family with Innovative Phase Splitting Architecture

Mic4520Micrel, Inc. has announced the MIC4520/MIC4521, an IntelliMOS power stage family capable of delivering up to 20 A in a 4 mm by 6 mm TQFN package. The MIC4521 is a two-phase power stage (includes MOSFET drivers and power MOSFETs) featuring integrated current and temperature sensing.

The MIC4521 can be interfaced with a single phase controller (such as Micrel’s MIC2111) to build a complete high-current and high-performance power converter. The MIC4520 is a single phase power stage that can operate with a single-phase or multiphase controller. These power stages can be used in a wide variety of point of load applications for end markets such as networking, servers, storage, base stations and graphic cards.

The MIC4520/MIC4521 utilizes Micrel’s FETZilla DMOS technology to achieve high efficiency (over 90 percent peak). Micrel’s IntelliMOS power MOSFETs have been optimized for low gate capacitance to enable fast switching performance (up to 1.2 MHz) for minimal switching losses while their low on-resistance reduces conduction losses.

“Board space and heat dissipation constitute major challenges in cloud computing systems, so designers need high efficiency and compact DC-DC solutions. Micrel’s IntelliMOS power stage solution meets these challenges and enables designers to reduce their solution size by operating at higher switching frequency while maintaining very high efficiency,” stated Brian Hedayati, vice president of marketing for high performance linear and power solutions at Micrel. “Micrel’s IntelliMOS solutions provide accurate monitoring and protection when used with Micrel’s MIC21000 digital controller. Designers can build a complete point of load solution with full monitoring, dynamic scaling of output voltage and fault protection.”

The MIC4521 offers intelligence and telemetry. The integrated current and temperature sensing of the MIC4521 enables power system designers to accurately measure and monitor the condition of each power converter to enhance system reliability. Both the MIC4520 and MIC4521 utilize Micrel’s propriety bi-directional fault communication protocol to provide system protection against faults.

The MIC4520/MIC4521 operate over an input voltage range of 7 V to 16 V. The devices can be configured for continuous or discontinuous conduction operation and support diode emulation mode for improved light load efficiency. The MIC4520/MIC4521 have a junction temperature range from -40°C to 125°C.

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