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Development of the BD71850MWV Power Management IC for the NXP i.MX 8M Nano Family : A 12-Output PMIC for i.MX 8M Nano Family


Recently the BD71850MWV power management IC was released. Usually, “power management IC” (hereafter “PMIC”) is a term for a power supply IC that integrates multiple power supply circuits and protection circuits, control logic, and an interface. There are PMICs which provide a complete set of general-use system voltages, and those designed to match the power supply specifications of specific processors or other devices. The BD71850MWV is a PMIC developed for the i.MX 8M Nano family of application processors manufactured by NXP® Semiconductors (hereafter “NXP”), which provide excellent computing power, power-conserving performance, and voice and music processing capabilities.

Features of the BD71850MWV PMIC

  • ・PMIC optimized for power specs for the NXP i.MX 8M Nano family
  • ・Supports the latest version, in succession to the BD71837AMWV for the i.MX 8M family and the BD71847AMWV for the i.MX 8M Mini family
  • ・Equipped with 6 buck DC-DC converters and 6 LDOs
  • ・The above functions integrated in a compact 7 mm×7 mm×1 mm 56-pin QFN package
  • ・Compared with a configuration based on discrete components, this PMIC eliminates 42 components and reduces footprint by 42%
  • ・Supports reduction of development time
  • -Linux driver and other application development materials, reference circuits, PCB layouts for the BD71850MWV provided
  • -i.MX 8M Nano evaluation kit equipped with the BD71850MWV provided (NXP)

Power Supply Functions Required by the i.MX 8M Nano Application Processor Realized on a Single Chip

The BD71850MWV incorporates power supply circuits that were designed in keeping with the power supply system of i.MX 8M Nano application processors, integrating 6 buck DC-DC converters and 6 LDO linear regulators, and is also capable of single-chip power supply to the DDR memory required by applications. In addition, the device also incorporates a 1.8 V/3.3 V switch for an SDXC card interface, a 32.768 kHz crystal oscillator driver, protection functions for each power supply system (such as output short-circuits, output over-voltages, output over-currents, thermal shutdown), and control logic (see the block diagram).

The buck DC-DC converters have a maximum efficiency of 95%, and the PMIC operates over a wide input voltage range (from 2.7 V to 5.5 V) supporting a variety of power sources from a single Li-ion battery cell to USB, and so is ideal for applications in which the i.MX 8M Nano processor tends to be used.

High level of Integration in a Compact Package Dramatically Reduces the Number of Components and Footprint

The power supply circuits and functions shown in the block diagram above are packed into a compact 7 mm × 7 mm × 1 mm 56-pin QFN package. The pin configuration is designed to facilitate connection to the i.MX 8M Nano application processor and to DDR memory, alleviating much of the trouble of PCB layout.

Compared with a system that uses discrete components to provide equivalent functions, it is possible to eliminate 42 components and reduce footprint by 42% (assuming single-sided mounting on a type 3 PCB). If double-sided mounting is used, power supply functions can be provided using not more than 400 mm2 of footprint.

Customizing Possible According to the System Application

In the interest of more flexible application design, a sequencer is equipped that supports several power modes (RUN, IDLE, SUSPEND, SNVS, OFF). Via an I2C interface and an OTP (One Time Programmable) ROM, the several power supplies can be turned on/off and their output voltages controlled, and protection functions can be enabled or disabled, according to the functions and memory type required by the system. Moreover, power mode transition conditions are customizable, so that application design optimized to the conditions of use is possible.

Support for Shortening Development Time

To simplify evaluations, the following URL offers a Linux driver for the BD71850MWV as well as design guidelines, reference circuits, and PCB layout information relating to peripheral applications necessary for design.

Moreover, NXP offers an i.MX 8M Nano processor evaluation kit equipped with the BD71850MWV, so that operation with the i.MX 8M Nano processor can be evaluated immediately.

Information on Downloading Technical Documents

Downloadable materials, including lecture materials from ROHM-sponsored seminars and a selection guide for DC-DC converters, are now available.

Download Technical Documents

Downloadable materials, including lecture materials from ROHM-sponsored seminars and a selection guide for DC-DC converters, are now available.

Product Key Points