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Altera Announces Digital DC-DC for Small Form Factor FPGAs

Google 우선 소스Published2015.03.20 14:13
Altera has added the EM1130, a new 30-amp PowerSoC DC-DC step-down converter for FPGAs, to its Enpirion power solutions portfolio.

We spoke to Patrick Wadden, director of worldwide business development at Altera, about the development focus and performance benefits of the EM1130, the first in a family of integrated digital DC-DC step-down converters for Altera's 10th generation FPGAs, including Arria 10 and Stratix 10 FPGA cores and transceiver power rails.


Q1. What was the biggest challenge Altera's development team faced in developing the EM1130, and how did they overcome it?

A: The biggest challenge was how to achieve the smallest form factor without compromising performance and efficiency. To achieve this, we explored various approaches, including packaging technologies and the use of inductors. We were able to address this challenge by using a custom inductor. By placing it on top of the powertrain and controller, we were able to reduce the size by 40% compared to other solutions. We also adopted a "flip-and-bump" monolithic powertrain, which also significantly reduced the size and achieved high efficiency. Altera's unique strength lies in its ability to address all three key technologies required for high-level integration: packaging, magnetics, and high-frequency IC technology.
Q2. Currently, the main obstacle to further reducing the size of the EM1130 appears to be the inductor. What solutions do you anticipate for the future roadmap to overcome this issue while maintaining or improving the device's performance?

A:   We are constantly developing new magnetic and silicon technologies, including exploring new materials that will further reduce inductor losses and overall size. Furthermore, our monolithic powertrain technology roadmap will further reduce switching losses and enable higher switching frequencies, thereby reducing the required filter size (L and C).
Q3. Can the Arria-10 offer significant performance advantages over competing FPGAs when used with the EM1130, even without the SmartVID feature? If so, how much of a performance improvement is achieved, and what are the primary reasons for this?

A:   The primary reason Arria 10's overall performance-to-power ratio is superior to that of its competitors is the combination of its architecture, tools, and semiconductor processes. Altera possesses unique elements in all of these areas, including a hard memory controller in its architecture, advanced placement and routing algorithms in its tools, and performance-focused semiconductor process improvements. SmartVID, a feature implemented in Arria 10, enables it to deliver a higher performance-to-power ratio than competing products.

For SmartVID, the EM1130 delivers the best user experience. We fully support this feature and have integrated it with Arria 10. Users can purchase A10 development kits and designs featuring these solutions now. Arria 10 power consumption is also reduced, thanks to the EM1130's tight output voltage setpoint accuracy of 0.5%. While most controllers can only guarantee 1% accuracy, the EM1130 can provide up to 0.5W of additional power savings. Again, SmartVID is a feature implemented in Arria 10, enabling Arria 10 to deliver a higher performance-to-power ratio than competing products.
Q4. You used the data center example to illustrate the power-saving and cost-saving aspects of the EM 1130. Could you give us some more examples of other applications where it could have a significant impact?

A:   All high-density boards will benefit from this technology. Customers now have the option to reduce the overall cost and size of their solutions, or increase the number of functions they can implement within a given size. For applications that utilize line cards, such as wireless base stations, switches, and routers, customers recognize that increasing the number of features, processors, or FPGAs per card is crucial for differentiating their products. In some cases, we have provided end customers with a way to add an additional FPGA to a card that already has three FPGAs. Simply replacing the existing power supply with Altera's Enpirion EM 1130 created ample headroom.
Q5. What do you think will be Altera's next major power product or technology after EM 1130?

A:   Through continuous integration and a true systems approach, products will emerge that offer the perfect combination of FPGA and power performance, enabling customers to achieve the most optimized solution that always operates at peak performance.

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Key Features of EM1130

The EM1130, a new PowerSoC device with adaptive digital control, enables FPGA-based systems to meet extremely stringent performance, power budget, and solution size requirements by delivering the industry's smallest footprint, high levels of output control, and fast transient response.

PMBus, which provides an interface to Altera's SmartVID (SmartVoltage ID) power-saving technology, achieves significant power savings by supplying a lower voltage (VCC) to Arria 10 and Stratix 10 FPGAs while maintaining the performance required for a given device speed grade. This allows the EM1130 to be 50 percent smaller than comparable modules while achieving 3 to 6 percent higher conversion efficiency, resulting in system power savings of more than 1 watt. This translates to annual electricity savings of $15 to $30 per module, which could translate to $3 million in annual power savings for a data center using a significant number of EM1130s, according to Patrick Wadden, director of worldwide business development at Altera.

The PMBus interface also enables telemetry for key parameter measurements, such as current, voltage, and temperature. This improves current and voltage telemetry accuracy by 30 to 50 percent, enhancing the performance of customer systems.

Adaptive control technology reduces the need for external compensation components and provides a robust solution for changing operating conditions through automatic adjustment. Furthermore, an easy-to-use GUI simplifies programming, allowing developers to quickly transition to an optimized solution.

The EM1130 architecture is a building block for implementing more intelligent systems, enabling communication and highly flexible configuration between the FPGA, system power, and other customer applications, accelerating time to market and reducing risk.

The EM1130 provides an integrated power management solution for Altera's high-end products, allowing customers to fully leverage the benefits of tightly integrating power solutions with FPGA platforms. More information about the EM1130 and Altera's entire power solution portfolio can be found at www.altera.com/enpirion.

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