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Texas Instruments UCD3138ARGCT
- Part No.:
- UCD3138ARGCT
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
UCD3138ARGCT.pdf
- Description:
- IC DGTL PWR CTRLR 64VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:483
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Product details
Overview
UCD3138ARGCT from Texas Instruments is a highly-integrated digital power controller IC designed for isolated AC-DC and DC-DC power conversion. It implements up to three independent PID-based digital control loops, delivers 250-ps DPWM pulse width resolution, supports up to 2-MHz switching frequency, and integrates a 31.25-MHz ARM7TDMI-S processor with 32 KB flash and 4 KB RAM-enabling real-time closed-loop control in telecom rectifiers and PFC stages.
For engineers reviewing the UCD3138ARGCT datasheet, UCD3138ARGCT pinout, UCD3138ARGCT application, or UCD3138ARGCT equivalent, this page provides verified technical context, package-specific pin mapping (64-pin VQFN), confirmed control loop architecture, validated fault protection features, and two rigorously cross-checked alternative controllers for isolated power supply design.
Technical Context
The UCD3138ARGCT embeds three Digital Power Peripherals (DPPs), each combining a dedicated error ADC (EADC), configurable 2-pole-2-zero digital compensator, and high-resolution DPWM outputs. Its EADC achieves 1-mV/LSB resolution with adaptive sample triggering and 8× oversampling, while DPWM modules deliver 4-ns phase/frequency resolution and cycle-by-cycle duty matching.
Control flexibility includes voltage mode, peak/average current mode, constant current, constant power, and multi-topology support-including phase-shifted full bridge, LLC, and bridgeless PFC. Hardware-accelerated functions include synchronous rectifier dead-time optimization, input voltage feed-forward, burst mode, and ideal diode emulation-all coordinated by the ARM7 core executing firmware from on-chip flash.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPWM Resolution | 250-ps pulse width resolution enables precise timing control for high-frequency resonant topologies |
| Max Switching Frequency | 2 MHz supports high-density LLC and GaN-based designs without external clock synthesis |
| EADC Resolution | Configurable down to 1 mV/LSB with automatic selection-critical for low-voltage output regulation |
| Control Loops | 3 independent hardware PID loops with nonlinear control and soft-start/stop-no CPU overhead per loop |
| Processor Core | 31.25-MHz ARM7TDMI-S with 32 KB program flash and 2 KB data flash with ECC for field firmware updates |
| Analog Comparators | 7 high-speed analog comparators with programmable blanking for cycle-by-cycle current limiting |
| Operating Temp | –40°C to +125°C ambient rating ensures reliability in industrial and telecom power systems |
Pinout & Package
UCD3138ARGCT is packaged in a 64-pin VQFN (RGC) with 9.00 mm × 9.00 mm body size and exposed thermal pad. Pin assignments are fully defined in TI's SLUSC66E datasheet, including dual-purpose GPIO capability on 30 pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPWM0A / DPWM0B | Dual-edge DPWM output pair | Drives high-side/low-side switches in half-bridge; supports adjustable dead-band and phase-shift |
| EAP0 / EAN0 | Differential error amplifier input 0 | Accepts feedback from isolated voltage sense network; optimized for <1-mV offset in precision regulation |
| AD00–AD13 | 14-channel 12-bit general-purpose ADC inputs | Monitor input voltage, temperature, bus current, and auxiliary signals at 267 ksps with programmable averaging |
| PMBUS_CLK / PMBUS_DATA | PMBus v1.2 interface | Enables real-time telemetry, configuration, and fault logging via standard system management bus |
| TCK / TDO / TDI / TMS | JTAG debug interface | Supports Code Composer Studio™ debugging and Fusion Digital Power™ GUI integration |
Key Features
| Feature | Design Value |
|---|---|
| Digital Power Peripherals (DPP) | Three independent hardware control loops eliminate CPU scheduling latency and guarantee deterministic response |
| Synchronous Rectifier Optimization | Hardware dead-time computation engine interfaces directly with UCD7138 drivers-reducing conduction loss without firmware intervention |
| Light-Load Efficiency Modes | Burst mode and ideal diode emulation reduce standby power below 50 mW in no-load conditions |
| Multi-Topology Flexibility | Native support for voltage mode, peak/average current mode, constant current, and constant power-enabling single firmware across PFC, LLC, and PSFB designs |
| Fault Protection Architecture | 7 analog + 10 digital comparators with programmable blanking and external fault inputs enable <100-ns overcurrent shutdown |
Applications
| Telecom Rectifiers | Server PSU PFC Stages |
|---|---|
Use Scenario: 48-V DC output rectifier in central office power systems with dynamic load steps up to 50 A/ms. IC Role / Device Role / Timing Role: Primary-side digital controller managing dual-phase interleaved boost PFC and downstream isolated DC-DC stage. Use Value: Input voltage feed-forward and fast analog comparator fault response ensure compliance with GR-1089 immunity requirements during line transients. | Use Scenario: 3.3-kW front-end power supply in hyperscale server racks requiring 96%+ efficiency at 50% load. IC Role / Device Role / Timing Role: Dual-loop controller regulating boost PFC output (380 V) while coordinating phase-shifted full-bridge isolation stage. Use Value: Cycle-by-cycle duty matching and hardware-based flux balancing maintain transformer symmetry under asymmetric loading-preventing saturation. |
| Isolated DC-DC Modules | Industrial AC-DC Power Supplies |
Use Scenario: Compact 500-W quarter-brick DC-DC module for factory automation I/O power with 24-V output and 1500-V isolation. IC Role / Device Role / Timing Role: Isolated controller implementing LLC resonant topology with primary-side sensing and synchronous rectification. Use Value: 250-ps DPWM resolution enables precise zero-voltage switching (ZVS) boundary control across 10:1 input range-reducing MOSFET stress and EMI. | Use Scenario: DIN-rail mounted 240-W AC-DC power supply for PLC controllers operating in –25°C to +70°C ambient. IC Role / Device Role / Timing Role: Single-chip solution handling bridge rectification, active PFC, and isolated flyback regulation with copper trace current sensing. Use Value: Internal temperature sensor and copper trace sensing eliminate external shunts and thermistors-reducing BOM count and improving long-term drift stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD31381ARGCT | Same RGC package and pinout; adds enhanced ESD robustness and improved thermal performance per SLUSC66F revision | Identical functional scope but qualified for extended temperature cycling per IPC-9592A; preferred for new BLR-critical designs | Select when board-level reliability under thermal cycling is mandatory-no firmware or layout changes required |
| UCC2897A | Analog PWM controller with external compensation; no integrated MCU, ADC, or digital communication | Limited to fixed-frequency voltage-mode or current-mode control; lacks telemetry, programmability, or multi-loop capability | Choose only for cost-sensitive, low-complexity flyback or forward converters where digital features are unnecessary |
Compared with UCD3138ARGCT, UCD31381ARGCT offers identical functionality with enhanced reliability validation, while UCC2897A provides a simpler, non-programmable analog alternative-making the former a drop-in upgrade and the latter a legacy-compatible fallback for basic topologies.
Availability
UCD3138ARGCT is available at Aetrix Electronics and suitable for telecom rectifiers, server PSU PFC stages, and isolated DC-DC modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and infrastructure programs.
Supply support for UCD3138ARGCT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in power conversion.
The UCD3138A product line was engineered specifically for digitally controlled isolated power supplies-integrating high-resolution DPWM, multi-loop control peripherals, and ARM-based firmware execution to replace discrete analog controllers and FPGAs in high-performance AC-DC and DC-DC systems.
FAQ
What is the maximum DPWM switching frequency supported by the UCD3138ARGCT?
The UCD3138ARGCT supports up to 2 MHz DPWM switching frequency. This capability is implemented in hardware within the Digital Power Peripheral modules and does not depend on ARM core clock speed or firmware overhead. The 2-MHz limit enables direct drive of GaN FETs in high-density LLC and resonant converter designs without external frequency multiplication.
Does the UCD3138ARGCT support peak current mode control?
Yes, the UCD3138ARGCT explicitly supports peak current mode control. Its EAP2/EAN2 differential inputs are recommended for this mode, and the device includes dedicated hardware for cycle-by-cycle current limiting using its seven high-speed analog comparators. Peak current mode operation is configurable per control loop and integrates seamlessly with hardware-based slope compensation and blanking time adjustment.
How many independent feedback loops can the UCD3138ARGCT manage simultaneously?
The UCD3138ARGCT manages up to three independent feedback loops simultaneously. Each loop is implemented in dedicated hardware (Digital Power Peripheral) with its own error ADC, 2-pole-2-zero digital compensator, and associated DPWM outputs-ensuring deterministic, low-latency control without CPU scheduling or interrupt latency affecting loop stability.
What communication interfaces are available on the UCD3138ARGCT?
UCD3138ARGCT provides PMBus v1.2 and two UART (SCI) interfaces. PMBus supports full telemetry readback, configuration, and fault logging compliant with SMBus 2.0. SCI0 is multiplexed with PMBus pins and supports auto-baud rate detection; SCI1 is dedicated and usable concurrently. Both UARTs enable host microcontroller integration or standalone debug access via Fusion Digital Power™ Designer.
Is the UCD3138ARGCT pin-compatible with other members of the UCD3138A family?
Yes, the UCD3138ARGCT (64-pin RGC package) is pin-compatible with the UCD31381ARGCT, which shares identical pinout, electrical characteristics, and firmware compatibility. However, it is not pin-compatible with the 40-pin RMH or RJA variants (UCD3138ARGER, UCD3138ARJER), which have reduced ADC channels, fewer fault inputs, and different pin allocations despite identical part numbering prefixes.
UCD3138ARGCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Digital Power Controller
- Voltage - Input:
- 2.1V
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-VQFN (9x9)
UCD3138ARGCT FAQ
1.How can I place an order for UCD3138ARGCT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3138ARGCT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UCD3138ARGCT reliable?
The price and inventory of UCD3138ARGCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3138ARGCT is usually 5 days.
3.What payment methods are accepted for UCD3138ARGCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3138ARGCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3138ARGCT?
UCD3138ARGCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3138ARGCT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UCD3138ARGCT?
For technical support, including UCD3138ARGCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3138ARGCT requirements.
6.How does Aetrix verify that UCD3138ARGCT is sourced from the original manufacturer or authorized distributors?
All UCD3138ARGCT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCD3138ARGCT meets industry standards.
7.What is the process for return or replacement of UCD3138ARGCT?
All UCD3138ARGCT units undergo pre-shipment inspection (PSI). If there is an issue with UCD3138ARGCT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UCD3138ARGCT part is unused and in its original packaging.
Return procedure for UCD3138ARGCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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