PMICs provide complete power management solution for microprocessors
The STPMIC1 and STPMIC25 from STMicroelectronics incorporate a mix of buck and boost converters and LDO regulators in a single chip, to provide a simple and small power circuit for advanced microprocessors.
STMicroelectronics has introduced the STPMIC25, a fully integrated power management IC (PMIC) for STM32MP2x series microprocessors. The new PMIC is offered alongside the STPMIC1, which is dedicated for the STM32MP1 series MPUs.
Compared to the STPMIC1, the STPMIC25 offers higher output power capability, improved output-voltage ripple/noise, superior transient performance, higher conversion efficiency, and improved safety management. It also offers a higher number of output rails, with 16 compared to the 12 of the STPMIC1.
Both devices can supply power to the processor as well as to external system peripherals such as DRAM and Flash memories, and other system devices.
In the STPMIC25, seven buck switch-mode power supplies provide excellent transient response and output-voltage precision across a wide range of operating conditions. The PMIC offers very high efficiency across the load range thanks to the ability to select either a low-power mode (LPM) or high-power mode (HPM). All the buck converters can switch smoothly between LPM and HPM.
The converters use an advanced PWM phase-shift synchronization technique with integrated PLL and programmable spread-spectrum frequency modulation to reduce EMI.
The STPMIC1 is also highly efficient, reducing power dissipation and extending battery life in portable applications. The power rails include four adjustable adaptive constant on-time switching buck converters, and four LDO regulators. A 5.2 V/1.1 A boost dc-dc converter with bypass mode is suitable for a 5 V or battery input.
The STPMIC1 is available in five different versions: four are factory pre-programmed to meet I/O voltage requirements at 3.3 V or 1.8 V, and one is not pre-programmed. All versions can be easily customized later during the design stage, giving flexibility to engineers. An embedded non-volatile memory can store power sequencing settings and status read-outs.