NXP PF0100: Multi-Rail PMIC for i.MX Processors

NXP PF0100: Multi-Rail PMIC for i.MX Processors

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Overview
The MMPF0100 (commonly called PF0100) is NXP's 14-channel configurable power management IC designed to pair with i.MX application processors across the i.MX 6, i.MX 7, and i.MX 8 families. It integrates multiple buck regulators, LDOs, a USB OTG boost converter, and power-sequencing logic into a single device, eliminating the need for a discrete supply design in space-constrained embedded systems. This article covers the channel architecture, programmability, and typical design considerations.

1. Part Overview
   The PF0100 is built around NXP's SMARTMOS technology. Its power-generation block includes up to four buck regulators that can be configured into as many as six independent outputs, one boost regulator, six general-purpose LDOs, one combined switch/LDO output, and a DDR termination reference. The buck stages are configurable in single-phase, dual-phase, or parallel modes, which allows designers to trade output current capability against the number of independent rails. The main processor core rail (SW1) can deliver up to 4.5 A in single-phase configuration, or split into SW1A, SW1B, and SW1C for lower-current, higher-count rail designs. Additional buck outputs cover memory, I/O, and peripheral supplies. A 5 V boost converter supports USB On-The-Go, and the LDOs handle analog, RTC, and low-current peripheral rails. The entire device is programmable through an I2C interface, including output voltages, power-up sequencing, and timing.

2. Key Features

3. Configurable buck architecture: four to six independent outputs depending on configuration, with single-phase, dual-phase, or parallel options.

4. Core rail (SW1) up to 4.5 A in single-phase mode, adjustable from 0.3 V to 1.875 V with dynamic voltage scaling (DVS).

5. SW2 up to 2.0 A (or 2.5 A in some configurations), adjustable from 0.4 V to 3.3 V.

6. SW3A/SW3B configurable as a single 2.5 A rail or two 1.25 A rails.

7. SW4 up to 1.0 A, adjustable from 0.4 V to 3.3 V.

8. 5.0 V boost regulator for USB OTG, supporting up to 5.15 V output.

9. Six general-purpose LDOs covering typical peripheral and analog supply needs.

10. DDR termination reference output for memory systems.

11. Coin-cell charger and RTC supply for always-real-time-clock domains.

12. I2C-controlled programmable output voltages, sequencing, and timing.

13. Power control logic with processor interface, event detection, and interrupt generation.

14. Key Specifications

15. Input voltage range: 2.8 V to 4.5 V (per vendor product page)

16. Buck regulators: 4 to 6 configurable outputs, 0.3 V to 3.3 V adjustable

17. Maximum buck current (single phase SW1): up to 4.5 A (per datasheet)

18. Boost regulator: 5.0 V to 5.15 V for USB OTG (per datasheet)

19. General-purpose LDOs: 6 outputs plus 1 switch/LDO combo (per datasheet)

20. DDR termination reference: integrated (per datasheet)

21. Interface: I2C programmable (per datasheet)

22. Coin-cell charger: integrated for RTC supply (per datasheet)

23. Package: 48-pin or larger QFN (typical - refer to official datasheet for exact package)

24. DVS: supported on core buck rail (per datasheet)

25. Target platforms: NXP i.MX 6, i.MX 7, and i.MX 8 application processors

26. Applications and Design Notes
    The PF0100 is the companion PMIC for NXP's i.MX evaluation boards and commercial modules, where it powers the processor core, memory controller, DDR memory, I/O banks, and peripherals. In a typical i.MX 6 or i.MX 7 design, SW1 supplies the core voltage with DVS, SW2 supplies the memory or SoC I/O, SW3 and SW4 cover additional rails, the boost powers USB OTG VBUS, and the LDOs handle analog, PLL, and SD card supplies. The DDR termination reference biases the VTT rail for DDR3/LPDDR2 memory. Design notes:

27. The buck configuration (single vs dual phase vs split outputs) must match the processor's power tree; NXP provides reference configurations for each i.MX variant.

28. External inductors for each buck stage must be selected per the datasheet table; saturation current must cover peak current in the chosen configuration.

29. Input and output capacitors should be low-ESR ceramic types placed close to the pins to handle ripple current.

30. The I2C programming model allows the boot ROM or external MCU to set voltages and sequencing; verify the default power-up sequence matches the i.MX processor's requirements before any I2C communication begins.

31. The coin-cell charger is intended for a small RTC backup battery; do not connect a main Li-ion cell to this output.

32. Design Considerations and Common Mistakes

33. Do not configure the buck outputs after power-up without consulting the processor's boot sequence: the i.MX ROM expects specific voltages at specific times, and a misconfigured PF0100 will prevent boot.

34. The 2.8 V to 4.5 V input range means the PF0100 typically runs from a 3.3 V or 3.7 V rail, not directly from a battery or wall adapter; an intermediate pre-regulator is required.

35. When splitting SW1 into multiple phases or outputs, the total current capability decreases proportionally; calculate the sum of loads against the configured rating.

36. The USB OTG boost requires an external inductor and output capacitor; follow the layout guidelines to avoid noise coupling into the analog LDOs.

37. Thermal performance in the QFN package depends on the exposed pad; insufficient copper or missing thermal vias will cause over-temperature shutdown at high combined load.

38. Conclusion
    The PF0100 remains a widely used PMIC in the i.MX ecosystem because its configurable buck architecture and integrated sequencing reduce board count compared with discrete solutions. Its I2C programmability adapts it across multiple i.MX variants, and the inclusion of DDR termination, RTC backup, and USB boost removes the need for several additional ICs.

FAQ
Q: Which i.MX processors work with the PF0100?
A: The PF0100 is designed for i.MX 6, i.MX 7, and i.MX 8 families. NXP provides specific configuration tables and reference schematics for each processor variant.

Q: Can the PF0100 run directly from a 5 V supply?
A: No. Its input range is 2.8 V to 4.5 V, so a 5 V rail must be stepped down first. It is typically powered from a 3.3 V intermediate rail or a single-cell Li-ion battery.

Q: How many independent voltage rails does the PF0100 provide?
A: Up to six buck outputs depending on configuration, plus six LDOs, one switch/LDO, a boost output, and a DDR reference, totaling over a dozen regulated rails.

Q: Is the PF0100 still in production?
A: The part is widely used in i.MX-based commercial modules and evaluation kits. Check NXP's product status for the specific ordering part number before designing it into a new program.

For exact specifications and design guidance, refer to the official NXP datasheet for MMPF0100 (PF0100).