PMIC Cuts PCB Space, BOM, And Power

By Mat Dirjish

Launched as a companion chip for the STM32MP1 heterogeneous multicore microprocessor, STMicroelectronics’ STPMIC1 power-management IC (PMIC) promises to save printed-circuit board (PCB) space, reduce the bill of materials (BOM), and reduce power consumption. Measuring 5 mm x 6 mm x 0.8 mm in a WFQFN 44-lead package, the device also provides power-rail monitoring and protection, handles power-up/down sequencing, and meets the ST32MP1’s accuracy and settling-time specifications.

In addition to supplying power rails for the microprocessor unit (MPU) and external system components, the STPMIC1 also provides a DDR memory reference voltage, a 500-mA USB OTG power switch, and a general-purpose power switch. Four buck converters in the PMIC boast fast transient response and precise output-voltage control to handle a wide range of operating conditions. A pulse-frequency modulation (PWM) mode boosts energy efficiency at low loads. During normal operation, PWM synchronization minimizes electro-magnetic interference (EMI). The boost converter, with bypass-mode capability, can power up to two USB ports and ensures smooth regulation either when operating from a battery or low-cost 5V ac/dc adapter.

Among the six LDO channels, one is featured for DDR3 termination and can operate in bypass mode for low-power DDR, while another provides automatic source detection to power a USB PHY. The remaining four LDOs are general-purpose outputs.

The STPMIC1 is in production now, priced from $1.70 each/1,000. An evaluation board, the STEVAL-PMIC1K1, is also available. For more details and revelations, procure and peruse the STPMIC1 datasheet. And don’t miss all the news and information you need to make your design job easier. Sign up for Sensors Daily Newsletters. It’s free, fast, and incredibly easy.


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