Multiphase PWM controllers with AVSBus

31st October 2016

Enaie Azambuja

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Datasheet

Intersil announced 12 digital multiphase controllers and a companion smart power stage, including the industry’s first digital solution with an Adaptive Voltage Scaling Bus (AVSBus). The new digital controllers provide up to seven phases assignable in any combination across two outputs, and combine with smart power stages to provide a scalable solution from 10A to 450A. The result is enhanced power optimisation and more energy-efficient networking and communications infrastructure equipment.

AVSBus joins the PMBus v1.3 specification and features a 50MHz high-speed bus that connects directly to the processor to communicate telemetry data and deliver efficiency savings through adaptive voltage positioning.

Intersil’s new DC/DC controllers and ISL99227 60A smart power stage support demanding CPU core voltages, memory, and auxiliary power rails, enabling power designers to customise their solution to meet any rail requirements.

The digital multiphase family is comprised of three groups of controllers. The ISL68137 and ISL68134 controllers utilise the AVSBus to power and communicate with ARM-based processors in network routers, switches, servers, storage, and wireless telecom equipment.

Two general-purpose controllers (ISL68127 and ISL68124) power network processors, FPGAs, SoCs and graphics accelerators. And eight controllers (ISL69147/44, ISL69137/34, ISL69128/27 and ISL69125/24) add a secondary high-speed interface (SVID or SVI2) to power the latest Intel and AMD processors in cloud computing applications that make up the IoT backbone.

The ISL681xx and ISL691xx controllers integrate a high performance digital engine featuring a patented synthetic current control architecture that tracks each phase current with zero latency.

This allows the device to respond to any load transient with precise current and voltage positioning, and 30% less capacitance than competitive devices. Synthetic current control also makes it possible to develop high reliability systems using all ceramic capacitors.

Engineers are able to realise the flexibility and benefit of digital control through Intersil’s easy to use PowerNavigator GUI software tool. PowerNavigator connects to development boards communicating across PMBus and AVSBus, allowing engineers to set up and control all parameters, optimise efficiency via precise current thresholds for adding/dropping phases, and adjust the loop tuning.

PowerNavigator eliminates board rework as designs are completed with on the fly changes for stability tuning and optimisation. The final configuration is simply stored to non-volatile memory.

“Our comprehensive family of digital multiphase solutions represents another breakthrough in size and flexibility while meeting the needs of any advanced digital load,” said Mark Downing, senior vice president of Infrastructure and Industrial Power products at Intersil.

“They deliver the efficiency and best-in-class transient and thermal performance our customers’ next-generation IoT and cloud computing systems require.”

The ISL681xx and ISL691xx digital multiphase controllers and ISL99227 smart power stage are available now, with detailed controller pricing in the table below. The ISL99227 smart power stage is supplied in a 5mm x 5mm, 32-lead QFN package and is priced at $5.21 USD in 1k quantities.

Development boards are also available to help engineers scale power supply performance and select connectivity requirements for rapid prototyping and development.