High-voltage, high-density power modules extend to 70V

March 24, 2014 // By Graham Prophet
Micrel’s MIC28304/MIC45205/MIC45208/MIC45212 family of power modules operates from 4.5V to 26.5V (70V for MIC28304) input and are capable of delivering currents of 3A, 6A, 10A and 14A, respectively.

These highly integrated power module solutions are designed to simplify the system power design process, and feature a complete switching power supply solution in an ultra-compact, thermally-enhanced, rugged, surface mount QFN package. The devices integrate a PWM controller, power MOSFETs, inductor, and associated discrete components to save board space and reduce component counts which results in higher system reliability. The devices are suited for RAID systems, network routers, blade servers, cellular base stations, medical test equipment, and test instrumentation.

Micrel asserts that these modules are among the highest input voltage rating and power density devices available in the market. They offer peak efficiency up to 93% and are optimised for fast load transient responses by using Micrel’s Hyper Speed Control architecture, This minimises output capacitance to further reduce the overall solution size. In addition, these modules meet the industry’s most demanding CISPR22, CLASS B, EMI standards, further reducing design complexity. The MIC28304’s 70V rating makes it suitable for applications such as automotive, industrial robotics, industrial automation, avionics, and 48V telecom.

The modules protect against overcurrent, overvoltage and thermal faults. There is also an internal soft-start function that controls the inrush current. Additional features include the flexibility to adjust the current limit, frequency (200 kHz to 600 kHz), and output voltage (from 0.8V to 5.5V). Optional pin-to-pin solutions are available with Micrel’s HyperLight Load control scheme to improve light load efficiency if required. These devices are available in an 8 x 8 mm (MIC45205), 10 x 10 mm (MIC45208) and 12 x 12 mm (MIC28304/MIC45212) QFN packages, and operate from -40°C to +125°C. Pricing starts at $7.10/$4.85/$7.2/$8.88, respectively.

Micrel; www.micrel.com