Voltage regulator solution for AI and 5G networking

25th March 2019

Alex Lynn

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Extending its portfolio of high current system chipset solutions, Infineon Technologies has introduced a 16-phase digital PWM multiphase controller, the XDPE132G5C. The portfolio enables currents of 500 to 1,000A and higher for next generation CPUs, GPUs, FPGA and ASICs used in high-end artificial intelligence (AI) servers and 5G datacom applications.

As CPU current requirements increase to enable next generation AI and networking workloads, DC-DC voltage regulators (VR) need to deliver more than 500A to the load. With a true 16-phase digital PWM engine and an improved advanced transient algorithm, the XDPE132G5C controller addresses these high phase count requirements.

The true active current sharing between phases enables a reliable, compact and cost-saving design. Furthermore, there is no need for extra logic doubler ICs commonly utilised in today’s high phase count markets.

Leading edge ASIC’s and FPGA’s in communication systems are requesting Vout control of less than 1mV steps. This is inherent in the XDPE132G5C, offering fine Vout setting in 0.625mV increments. In addition, it supports communication market auto-restart requirements with options to reduce remote site maintenance following power or system glitches.

The XDPE132G5C is packaged in a seven by seven millimetre 56-pin QFN to accommodate 16 phases. It employs a full digital and programmable load line and is PMBus 1.3/AVS compliant delivering a comprehensive suite of telemetry features. Paired with TDA21475, a thermally efficient integrated current sense power stage, the XDPE132G5C controller can efficiently deliver over 1,000A.

The 70 A-rated TDA21475 power stage, housed in a five by six millimetre package, provides efficiency of more than 95%. The exposed top significantly reduces the R th(j-top) from 19°C/W in the over-molded package to 1.6°C/W. This efficiently removes heat from the top of the package, resulting in VR power density and optimal VR phase count and footprint.

To further maximise the capability of the CPU/ASIC, the TDA21475 also offers smart overcurrent and overvoltage protection and delivers accurate temperature and current information to the XDPE132G5C controller.

Rounding out Infineon’s portfolio of high current chipset solutions is the IR35223 true ten-phase PWM digital controller. It provides a cost-effective option for VR solution requirements of up to 500A. The IR35223 is housed in a six by six millimetre, 48-pin QFN package and provides advanced transient performance and telemetry features including PMBus 1.3/AVS bus compliance.