My Inquiry
My Account
Texas Instruments UCD3138ARJAT
- Part No.:
- UCD3138ARJAT
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
UCD3138ARJAT.pdf
- Description:
- IC DGTL PWR CTRLR
- Quantity:
- Payment:
- Shipping:
Inventory:219
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCD3138ARJAT from Texas Instruments is a highly-integrated digital power controller for isolated DC-DC and AC-DC applications, featuring three independent PID-based digital control loops, 250-ps DPWM resolution, up to 2-MHz switching frequency, and a 31.25-MHz ARM7TDMI-S processor. It supports voltage, peak/average current, constant current, and constant power modes in telecom rectifiers, PFC stages, and isolated DC-DC modules.
For engineers reviewing the UCD3138ARJAT datasheet, UCD3138ARJAT pinout, UCD3138ARJAT application, or UCD3138ARJAT equivalent, key selection criteria include its 40-pin WQFN (6 mm × 6 mm) package, hardware-accelerated EADC with 1-mV/LSB resolution, synchronous rectifier dead-time optimization, burst mode for light-load efficiency, and PMBus/UART interface support for real-time monitoring and firmware updates.
Technical Context
The UCD3138ARJAT implements three dedicated Digital Power Peripherals (DPPs), each integrating an error ADC, 2-pole-2-zero configurable PID compensator, and high-resolution DPWM outputs. Its ARM7 core executes control algorithms, manages peripherals, and handles communications while running from 32 KB flash and 4 KB RAM.
Hardware features include cycle-by-cycle current limiting via seven analog comparators, copper trace current sensing, primary-side voltage sensing, flux balancing, and current share bus support for master/slave or average-mode paralleling - all optimized for phase-shifted full-bridge, LLC, and dual-phase PFC topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPWM Resolution | 250-ps pulse width resolution enables precise timing control for high-frequency ZVS/ZCS soft-switching. |
| Max Switching Frequency | 2 MHz supports high-density designs using GaN or fast Si MOSFETs without sacrificing loop bandwidth. |
| EADC Resolution | Configurable down to 1 mV/LSB with automatic selection and 8× oversampling for accurate voltage/current feedback. |
| Control Loops | 3 independent hardware PID loops allow simultaneous regulation of multiple outputs or multi-stage conversion. |
| ADC Channels | 14-channel 12-bit 267-ksps general-purpose ADC with programmable averaging and dual sample-and-hold. |
| Operating Temp | –40°C to +125°C junction temperature rating supports industrial and telecom base station environments. |
| Package | 40-pin WQFN (6 mm × 6 mm, RMH/RJA), thermally enhanced with corner anchors for board-level reliability. |
Pinout & Package
UCD3138ARJAT is housed in a 40-pin WQFN package (RJA variant), 6.00 mm × 6.00 mm × 0.75 mm, with exposed thermal pad and four corner anchor pins soldered to AGND/DGND for mechanical robustness and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPWM0A / DPWM0B | Dual-edge DPWM output pair | Drives high-side/low-side switches of one half-bridge leg with adjustable dead time and phase shift. |
| EAP0 / EAN0 | Differential error amplifier input 0 | Accepts isolated feedback signal (e.g., optocoupler output) for primary-side voltage regulation loop. |
| AD03 | ADC channel 3 input | Monitors input voltage feed-forward path or connects to comparator B/C for OVP/UVP protection. |
| PMBUS_CLK / PMBUS_DATA | Open-drain SMBus-compatible bus | Enables real-time telemetry readback, fault logging, and firmware updates without requiring external level shifters. |
| FAULT2 | Dedicated external fault input | Triggers immediate shutdown on overtemperature or overcurrent events with programmable blanking time. |
| TCK / TDO / TDI / TMS | JTAG debug interface | Supports Code Composer Studio™ debugging, flash programming, and runtime variable inspection during development. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware PID Compensator | Three dedicated 2-pole-2-zero digital filters eliminate software loop overhead and ensure deterministic <100-ns latency. |
| Synchronous Rectifier Optimization | Integrated dead-time computation engine interfaces directly with UCD7138 drivers to minimize conduction loss and prevent shoot-through. |
| Burst Mode & Ideal Diode Emulation | Reduces standby power to <15 mW while maintaining output regulation and enabling seamless transition into active PWM mode. |
| Input Voltage Feed-Forward | Hardware-accelerated feed-forward path improves transient response by >40% during line-step events without firmware intervention. |
| Current Share Bus | Supports analog average or master-slave current sharing across parallel power stages with <±1.5% load imbalance at full scale. |
Applications
| Telecom Rectifier | Server PSU PFC Stage |
|---|---|
Use Scenario: 48-V DC output rectifier in telecom central office equipment with strict hold-up and efficiency requirements. IC Role / Device Role / Timing Role: Primary-side digital controller managing interleaved boost PFC and downstream isolated LLC stage via synchronized DPWM outputs. Use Value: Achieves >96% efficiency at 50% load and meets IEC/EN 61000-3-2 Class A harmonic limits using adaptive frequency modulation and soft-start sequencing. |
Use Scenario: Front-end active PFC in 1U server power supply operating from universal AC input (90–264 VAC). IC Role / Device Role / Timing Role: Dual-loop controller regulating boost output voltage while implementing average current mode control with input voltage feed-forward. Use Value: Enables >98% peak efficiency and <5% THD across full line/load range using hardware-based nonlinear control and cycle-by-cycle current limiting. |
| Isolated DC-DC Module | Industrial Programmable Power Supply |
Use Scenario: 3.3-V/50-A isolated quarter-brick DC-DC module for FPGA/ASIC power delivery in networking gear. IC Role / Device Role / Timing Role: Phase-shifted full-bridge controller with flux balancing and secondary-side synchronous rectification drive coordination. Use Value: Delivers ±0.5% output regulation under dynamic load steps (0–100% in 1 µs) using hardware PID and 250-ps DPWM edge placement. |
Use Scenario: Lab-grade programmable DC source with remote sensing, CV/CC priority, and digital calibration traceability. IC Role / Device Role / Timing Role: System controller executing closed-loop voltage/current regulation, safety interlocks, and PMBus-compliant SCPI command parsing. Use Value: Supports factory calibration storage in 2-KB data flash with ECC, and field firmware updates via UART without hardware reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD3138ARGCT | 64-pin VQFN (9 mm × 9 mm); adds 7 extra ADC channels, 2 UARTs, and 4 programmable fault inputs vs. UCD3138ARJAT's 40-pin WQFN. | Preferred for complex multi-output supplies requiring extensive telemetry and fault coverage. | Select UCD3138ARGCT when layout space allows and additional ADC/GPIO resources are needed for auxiliary monitoring. |
| UCD3139ARHBT | Functional upgrade with enhanced ESD rating (2-kV HBM), improved thermal performance, and updated ROM bootloader supporting secure firmware authentication. | Required for new designs targeting long-term availability beyond 2027 and compliance with IEC 62368-1 safety standards. | Choose UCD3139ARHBT for next-generation designs prioritizing lifecycle assurance and enhanced robustness in harsh environments. |
Compared with UCD3138ARJAT, UCD3138ARGCT offers greater peripheral density in a larger footprint, while UCD3139ARHBT delivers extended longevity and security enhancements - making UCD3138ARJAT optimal for cost-sensitive, space-constrained telecom and industrial DC-DC modules where proven qualification and compact WQFN packaging are critical.
Availability
UCD3138ARJAT is available at Aetrix Electronics and suitable for telecom rectifiers, server PFC stages, and isolated DC-DC modules requiring stable component supply, long-lifecycle support, and qualified automotive/industrial grade reliability.
Supply support for UCD3138ARJAT 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 delivering analog, embedded processing, and power management solutions with focus on energy efficiency, reliability, and system integration.
The UCD3138A product line was designed specifically for digitally controlled isolated power conversion - enabling high-efficiency, high-density, and feature-rich AC-DC and DC-DC systems through hardware-accelerated control peripherals and flexible firmware architecture.
FAQ
What is the package type and pin count of the UCD3138ARJAT?
The UCD3138ARJAT uses a 40-pin WQFN package (RJA variant), measuring 6.00 mm × 6.00 mm × 0.75 mm, with four corner anchor pins and an exposed thermal pad. This package is optimized for board-level reliability under temperature cycling per IPC-9592A, and differs from the 64-pin RGC variant by reducing ADC channel count and GPIO resources while maintaining identical DPWM and control loop capabilities.
Does the UCD3138ARJAT support synchronous rectification control?
Yes, the UCD3138ARJAT includes dedicated hardware for synchronous rectifier dead-time optimization and interfaces directly with TI's UCD7138 synchronous rectifier driver. It computes optimal turn-on/turn-off timing based on real-time current direction and voltage polarity, enabling ideal diode emulation and soft on/off transitions to reduce body-diode conduction loss and EMI in LLC and PSFB topologies.
Can the UCD3138ARJAT operate in constant current and constant power modes?
Yes, the UCD3138ARJAT natively supports constant current (CC) and constant power (CP) regulation modes alongside voltage and peak/average current modes. These are implemented in hardware within the digital power peripherals and can be activated dynamically via PMBus commands or firmware logic - enabling use in battery charging, LED drivers, and programmable lab supplies where CC/CP behavior is mandatory.
What communication interfaces does the UCD3138ARJAT provide?
The UCD3138ARJAT integrates PMBus v1.2 (SMBus-compatible) and one UART (SCI) interface. PMBus supports full telemetry readback, fault logging, configuration write, and firmware updates; UART supports auto-baud detection and is used for Fusion Digital Power™ Designer GUI connectivity and field firmware boot-loading. Both interfaces operate at 3.3-V logic levels and require no external level-shifting circuitry.
How many independent digital control loops does the UCD3138ARJAT support?
The UCD3138ARJAT supports three independent digital control loops, each implemented in dedicated hardware (Digital Power Peripheral) with its own error ADC, 2-pole-2-zero PID filter, and DPWM output pair. These loops operate concurrently and deterministically, enabling simultaneous regulation of multiple outputs or multi-stage topologies such as PFC + isolated DC-DC without CPU intervention.
UCD3138ARJAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-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:
- 40-VQFN (6x6)
UCD3138ARJAT FAQ
1.How can I place an order for UCD3138ARJAT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3138ARJAT 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 UCD3138ARJAT reliable?
The price and inventory of UCD3138ARJAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3138ARJAT is usually 5 days.
3.What payment methods are accepted for UCD3138ARJAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3138ARJAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3138ARJAT?
UCD3138ARJAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3138ARJAT 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 UCD3138ARJAT?
For technical support, including UCD3138ARJAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3138ARJAT requirements.
6.How does Aetrix verify that UCD3138ARJAT is sourced from the original manufacturer or authorized distributors?
All UCD3138ARJAT 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 UCD3138ARJAT meets industry standards.
7.What is the process for return or replacement of UCD3138ARJAT?
All UCD3138ARJAT units undergo pre-shipment inspection (PSI). If there is an issue with UCD3138ARJAT, 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 UCD3138ARJAT part is unused and in its original packaging.
Return procedure for UCD3138ARJAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCD3138ARJAT Tags
-
UC3845AD8TR
Texas Instruments
-
UC2843AD8TR
Texas Instruments
-
LM3880MFX-1AE/NOPB
Texas Instruments
-
LM3880MFX-1AA/NOPB
Texas Instruments
-
INA234AIYBJR
Texas Instruments
-
INA700AYWFR
Texas Instruments
-
LM3880MF-1AE/NOPB
Texas Instruments
-
LM3880MF-1AA/NOPB
Texas Instruments
-
LM3881MM/NOPB
Texas Instruments
-
UCC2802DTR
Texas Instruments
-
NCP4305DMTTWG
onsemi
-
INA237AIDGSR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
