MaxLinear, Inc. announced that Raspberry Pi has selected the MxL7704 Universal PMIC to power its latest single-board computer, the Raspberry Pi 4. The MxL7704 is a five output universal PMIC optimized for powering low power FPGAs, DSPs, and microprocessors from 5V inputs.
MaxLinear points out that the MxL7704 already powers the popular Raspberry Pi 3 Model B+. The company says that the versatility of this PMIC allowed it to be easily re-programmed to accommodate the new current limit, sequencing, and power specifications of the upgraded SoC and surrounding ICs of the new Raspberry Pi 4.
MxL7704 provides all essential power rails required by the Raspberry Pi 4, including the low noise voltage rail for the audio circuitry.
With its I2C programmability, MaxLinear says it also handles the unique power sequencing requirements of each rail with ease. The MxL7704’s I2C interface communicates with Rasberry Pi 4’s SoC for dynamic voltage scaling, sequencing control, status monitoring, and PGOOD routing. These features enable the Raspberry Pi 4 to dynamically reduce the voltage to the SoC when the system is idle and boost it when the processor is running at maximum speed to save power.
Four synchronous step-down buck regulators provide system memory, I/O, and core power from 1.5A to 4A. An on-board 100mA LDO delivers clean 1.5V to 3.6V power for analog sub-systems.
Also, an integrated 8-bit ADC with 2 external inputs and temperature sensor provides die temperature monitoring, telemetry, and additional flexibility. The Raspberry Pi 4 uses the MxL7704’s on-board ADC to determine if a high-current delivery USB power supply is connected.
Read more: MAXLINEAR PMIC POWERS THE NEW RASPBERRY PI 4