Five output power management controller for low power FPGAs and SoCs

March 06, 2018 // By Nick Flaherty
MaxLinear has developed a five output power management IC (PMIC) specifically designed to power a broad range of low power FPGAs, DSPs and microprocessors in embedded computing systems, IoT clients, industrial control systems, POS terminals and test equipment.

The MxL7704 includes four synchronous step-down buck regulators that provide system, memory, I/O and core power from 1.5A to 4A along with an on-board 100mA LDO that provides clean 1.5V to 3.6V power for analogue sub-systems. The device uses a conditional sequencing state machine that is flexible enough to meet the requirements of virtually any processor. The MxL7704-X and MxL7704-A are the first standard configurations to be launched based on this PMIC design.

The MxL7704-X has been optimized for powering the Xilinx Zynq Ultrascale+ ZU2 and ZU3 MPSoCs. The bucks are pre-programmed to provide the core rail (0.85V up to 4A), LPDDR3 memory power (1.35V), I/O and system power (1.8V and 3.3V). Sequencing is tailored to the needs of the ZU2 and ZU3 MPSoCs, cutting design and development time.

The MxL7704-A is designed to power a wide range of ARM Cortex- based processors (A7, A9, and A53) which use a more conventional sequencing scheme where the I/O rails power up first and core is last. The bucks provide the 1.2V core rail, 1.35V LPDDR3 power, 1.8V and 3.3V rails for I/O and system power.

"We created the perfect companion PMIC by working very closely with high profile lead customers,” said Tuomas Hollman, Senior Director of Marketing for Power Management Products at MaxLinear. "The MxL7704 provides system designers with 5 rails pre-optimised for ease of use with a host of features that allow monitoring, telemetry and additional flexibility."

The PMIC offers a 1MHz to 2.1MHz switching frequency and uses a current mode architecture with internal compensation. These features enable a very fast transient response to line and load changes without sacrificing stability or board space. An I 2C interface allows dynamic voltage control on all outputs, status monitoring by channel, input voltage status, sequencing control and P GOOD routing. An on-board 8-bit ADC has two external inputs and die temperature monitoring. It operates over an input voltage range of 4V to 5.5V and includes fault protection


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