UCD3138128PFC

Overview

The UCD3138128PFC is a highly integrated digital power controller from Texas Instruments, part of the UCD3138x family. It features a 32-bit ARM7TDMI-S processor and 128kB of program flash memory organized in multiple banks to support dual image firmware updates without power interruption. The device includes up to eight high-resolution Digital Pulse Width Modulated (DPWM) outputs with 250ps pulse width resolution and supports switching frequencies up to 2MHz. It integrates an Error ADC with up to 16 MSPS sampling rate and configurable resolution down to 1mV/LSB. The component operates within a supply voltage range of 3V to 3.6V and functions across a temperature range of -40°C to +125°C. It is housed in an 80-TQFP package.

Feature Summary

• Supports execution from one memory bank while programming another, enabling 'on-the-fly' firmware updates without shutting down the power supply
• Provides digital control for up to three independent feedback loops using dedicated PID-based hardware with configurable non-linear control
• Integrates high-speed analog front-end peripherals including a 16 MSPS Error ADC and up to eight DPWM outputs with precise phase and frequency resolution
• Includes additional communication ports compared to standard derivatives, such as SPI and a second I2C port

Applications

• Server power supplies
• Telecommunications rectifiers
• Isolated DC/DC modules
• Industrial power systems

Procurement Notes

Verify the specific suffix PFC against the manufacturer's current datasheet to confirm pinout and electrical specifications match your design requirements. Ensure compatibility with the 80-TQFP footprint and check moisture sensitivity levels for proper storage and reflow soldering profiles. Confirm that the 128kB flash capacity aligns with your firmware size constraints.

Selection Notes

Select this variant when application logic requires extensive code space beyond the 64kB limit of the UCD3138A64 derivative. The 128kB capacity facilitates complex control algorithms and robust dual-image boot structures. Verify that the 80-pin TQFP package fits the PCB layout constraints compared to smaller QFN options available in the same family.

Part Context

This component belongs to the UCD3138x series of digital power controllers designed for high-performance isolated power conversion. It serves as a single-chip solution replacing discrete analog components by integrating processing, control loops, and modulation hardware. The 128kB flash version offers enhanced programmability for advanced power management strategies in infrastructure applications.

Replacement Considerations

• UCD3138128PFCR
• UCD3138128PFC