STMicroelectronics PM6773 and PM6776 digital multiphase controllers

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STMicroelectronics’ PM6773 and PM6776 step-down controllers meet demands for energy-efficient power delivery in servers and data centres using low-voltage, high-current microprocessors, ASICs and field-programmable devices. In particular, the ICs are designed to power Intel Skylake CPUs and DDR4 memories, extending ST’s family of digital step-down controllers for Intel VR13 platforms.

The VR13 Serial Voltage ID (SVID) compliant ICs are 12 V-input, dual-channel, multiphase 3+1 (PM6773) and 6+1 (PM6776) devices. They are PMBus-programmable and feature embedded non-volatile memory (NVM) for storing configuration data. The PMBus communication interface also allows reporting of voltage, current, power, temperature and fault status. In addition, both devices include a valuable black-box recorder function.

The controllers use ST’s high-performance Voltage-Controlled Constant-On-Time (STVCOT) digital-control-loop technology, which enables fast transient response and low output capacitance, as well as variable-frequency diode emulations (VFDE) and dynamic phase management (DPM) to ensure high efficiency over all load conditions. Protection against load overcurrent, under- and over-voltage and feedback disconnections is also built in.

Engineers can accelerate the design of the VR13 voltage regulator for Skylake using the PM677x devices with ST’s software tools  to program and monitor all key parameters, including control-loop response, load-line and switching frequency.

For more information: www.st.com/multiphasecontrollers.