Product details


Number of outputs 6 Frequency (Max) (kHz) 2000 Number of ADC channels 9 Analog comparators 4 Communications 1 PMBUS, 1 SPI, 1 UART Compensator 3-pole/3-zero DPWM resolution (ps) 250 GPIOs 21 Number of digital power peripheral feedback loops 2 Non-volatile memory 2kB (Data), 32kB (Program) Processor 31.25MHz, 32-bit ARM7 Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Digital power isolated controllers

Package | Pins | Size

VQFN (RGZ) 48 49 mm² 7 x 7 VQFN (RGZ) 48 49 mm² 7.0 x 7.0 open-in-new Find other Digital power isolated controllers


  • Digital Control of up to Four Voltage Feedback Loops
  • Up to Eight High-Resolution Digital Pulsewidth Modulated (DPWM) Outputs for Supporting a Wide Range of Offline, Isolated and Non-Isolated DC-to-DC Topologies
    • 250-ps DPWM Pulse-Width Resolution
    • 4-ns DPWM Frequency Resolution
    • Adjustable Phase Shift Between DPWM Outputs
    • Adjustable Dead Band Between Each DPWM Pair
    • Active-High or -Low DPWM Polarity
    • Up to 2-MHz DPWM Switching Frequency
  • Dedicated High-Speed Error Analog-to-Digital Converter (EADC) for Each Feedback Loop With Sense Resolution of up to 1 mV
  • On-Chip 10-Bit D and A Converter (DAC) for Setting EADC Reference Voltage
  • Dedicated Hardware Accelerated Digital Compensators or Control Law Accelerators (CLA)
    • Three-Pole, Three-Zero Configurable Compensator
    • Features Non-Linear Digital Control
    • Multiple Programmable Coefficient Registers for Adaptive Digital Compensation
  • Up to 15-Channel, 12-Bit, 200-ksps, Analog-to-Digital Converter (ADC)
  • Multiple Levels of Fault Protection
    • Four High-Speed Analog Comparators
    • External Fault Inputs
    • 12-Bit ADC
  • Configurable for Voltage-Mode, Average-Current-Mode, and Resonant-Mode Control
  • Allows Synchronization of DPWM Waveforms Between Multiple UCD3040, UCD3020 and UCD3028 (UCD30xx) Devices
  • Adjustable DPWM Pulse Width Enables Support for Current Balancing in a Multiphase Application.
  • High-Performance 31.25-MHz, 32-Bit ARM7 Processor
  • 32-KByte Program Flash and 2-KByte Data Flash Memory With Error Correction Code (ECC)
  • 4-KByte Data RAM
  • 4-KByte Boot ROM
  • Communication Peripherals
    • PMBus
    • UART
    • SPI
    • JTAG (Not Available in the UCD3028)
  • Single-Supply Solution: Internal Regulator Controls External Pass Element
  • Internal Temperature Sensor
  • Up to Five Additional Timers
  • Built-In Watchdog, BOD, and POR
  • 80-Pin QFP (PFC), 64-Pin QFN (RGC), 48-Pin QFN (RGZ), and 40-Pin QFN (RHA and RMH) Package Offerings
  • Operating Temperature Range: –40°C to 125°C
    • Isolated AC-to-DC and DC-to-DC Power Supplies
    • Power-Factor Correction
    • Non-Isolated DC-to-DC Power Supplies
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    The UCD30xx devices are members of a family of digital PWM controllers from Texas Instruments providing a single-chip control solution for digital power-conversion applications. These devices allow digital control implementation of a high-performance, high-frequency power supply with flexible configuration of parameters, supervisory, monitoring, and communication functions.

    The UCD30xx are fully programmable solutions that are configurable to support a wide range of isolated and non-isolated topologies in single- or multiphase configurations. Some examples include interleaved PFC, isolated forward, half-bridge, phase-shifted full bridge, active clamp, and resonant LLC.

    At the core of the UCD30xx controllers are the digital control-loop peripherals, also known as Fusion Digital Power peripherals (FDPP). Each FDPP implements a high-speed digital control loop consisting of a dedicated error analog-to-digital converter (EADC), a three-pole/three-zero (3p, 3z) digital compensator, and two DPWM outputs with 250-ps pulse-width resolution. The device also contains a 12-bit, 200-ksps general-purpose ADC with up to 15 channels, timers, interrupt controls, and communications ports such as PMBus, SCI, and SPI. The device is based on a 32-bit ARM7 RISC CPU that performs real-time monitoring, configures peripherals, and manages communications. The CPU executes its program out of programmable flash memory as well as ROM.

    The UCD30xx is supported by Texas Instruments' Code Composer Studio software development environment.

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    UCD3138 ACTIVE Highly Integrated Digital Controller for Isolated Power with 3 Feedback Loops and 8 DPWM Outputs This product has 3 independently confirgurable control loops and 8 DPWM outputs.

    Technical documentation

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    View all 4
    Type Title Date
    * Data sheet Digital Power Controllers. datasheet (Rev. H) Aug. 23, 2013
    Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
    Application note Using FlashRunnerTM FR03TXI0 for Standalone Programming Aug. 30, 2012
    Application note PFC THD Reduction and Efficiency Improvement by ZVS or Valley Switching Apr. 26, 2012

    Design & development

    For additional terms or required resources, click any title below to view the detail page where available.

    Hardware development

    DEBUG PROBE Download
    XDS200 USB Debug Probe

    The XDS200 is a debug probe (emulator) used for debugging TI embedded devices.  The XDS200 features a balance of low cost with good performance as compared to the low cost XDS110 and the high performance XDS560v2.  It supports a wide variety of standards (IEEE1149.1, IEEE1149.7, SWD) in a (...)


    The XDS200 is the mid-range family of JTAG debug probes (emulators) for TI processors. Designed to deliver good performance and the most common features that place it between the low cost XDS110 and the high performance XDS560v2, the XDS200 is the balanced solution to debug TI microcontrollers (...)

    Software development

    Fusion Digital Power Studio
    FUSION-DIGITAL-POWER-STUDIO Fusion Digital PowerTM Studio incorporates software tools for Texas Instruments' UCD3138 Integrated Digital Controller family.   Fusion Digital Power helps power supply engineers to gain benefits of digital power without learning complex programming skills. Fusion Digital Power is an intuitive (...)
    Digital Power Software
    FUSION_DIGITAL_POWER_DESIGNER Fusion Digital Power™  is the Graphical User Interface (GUI) used to configure and monitor select Texas Instruments digital power controllers and sequencer/health monitors. The application uses the PMBus protocol to communicate with the device over serial bus by way of a TI USB adapter.

    Some of the tasks you can perform with the GUI include:

    • Turn on or off the power supply output, either through the hardware control line or the PMBus OPERATION command
    • Monitor real-time data. Items such as input voltage, output voltage, output current, temperature, and warnings/faults are continuously (...)
    Fusion Digital Power Manufacturing Tool
    FUSION_MFR_GUI The Fusion Digital Power Manufacturing Tool (aka MFR GUI) is a Graphical User Interface used to download firmware, upgrade firmware, configure, calibrate and test .

    The MFR GUI supports the same devices as Fusion Digital Power Designer software.  This tool is typically used in manufacturing (...)


    Some of the tasks the tool can perform include:

    • Download/Upgrade firmware
    • Program a device configuration
    • Calibrate a device (manually or instrumented via GPIB):
      • Input voltage (Vin)
      • Output voltage (Vout)
      • Output current (Iout)
      • Temperature
    • Test the device (validate power conversion falls within acceptable Vout (...)
    Fusion Digital Power Production Tool
    FUSION-PRODUCTION-GUI — The Fusion Digital Power Production Tool (production GUI) is a graphical user interface used to download firmware, upgrade firmware, configure, calibrate and test.  This command-based interface allows the seamless integration of UCD flashing procedures in a production environment.

    The production GUI (...)
    Some of the tasks the tool can perform include:
    • Download firmware in "ROM" mode
    • Upgrade firmware in "Program" mode
    • Program a device configuration
    • Write serial numbers
    • The tool supports multiple devices on a board, and includes built-in logging and reporting
    • Test the device (validate power conversion falls (...)
    FlashRunner™ FR03 In-System Programmer
    Provided by SMH Technologies — FlashRunnerTM FR03 is a high-performance, standalone In-System Programmer for Flash-based microcontrollers and serial memories. FlashRunnerTM FR03, which is targeted at production environments, easily interfaces to a programming system or Automatic Test Equipment (ATE) and can work either in full (...)
    • In-system programming support for UCD3138, UCD3020, UCD3028, UCD3040, and other TI products
    • Standalone operation with Start button (projects and code images stored on a memory card)
    • Controllable by any host system via RS-232, also can be integrated with ATE
    • Supports ISP (in-system programming (...)
    SLDC011K.ZIP (12589 KB)
    SLDC014G.ZIP (9687 KB)

    Design tools & simulation

    PSpice® for TI design and simulation tool
    PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
    • Leverages Cadence PSpice Technology
    • Preinstalled library with a suite of digital models to enable worst-case timing analysis
    • Dynamic updates ensure you have access to most current device models
    • Optimized for simulation speed without loss of accuracy
    • Supports simultaneous analysis of multiple products
    • (...)

    CAD/CAE symbols

    Package Pins Download
    VQFN (RGZ) 48 View options

    Ordering & quality

    Information included:
    • RoHS
    • REACH
    • Device marking
    • Lead finish/Ball material
    • MSL rating/Peak reflow
    • MTBF/FIT estimates
    • Material content
    • Qualification summary
    • Ongoing reliability monitoring

    Support & training

    TI E2E™ forums with technical support from TI engineers

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    If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​