My Inquiry
My Account
Texas Instruments UCD3138ARJAR
- Part No.:
- UCD3138ARJAR
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
UCD3138ARJAR.pdf
- Description:
- IC DGTL PWR CTRLR 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCD3138ARJAR 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 with 32 KB flash and 4 KB RAM. It supports voltage, peak/average current, constant current, and constant power modes in telecom rectifiers and PFC stages.
For engineers reviewing the UCD3138ARJAR datasheet, UCD3138ARJAR pinout, UCD3138ARJAR application, or UCD3138ARJAR equivalent, key selection considerations include its 40-pin WQFN (6 mm × 6 mm) package, dual PMBus/UART interfaces, hardware-accelerated burst mode and ideal diode emulation, and support for phase-shifted full-bridge, LLC, and bridgeless PFC topologies.
Technical Context
The UCD3138ARJAR implements three Digital Power Peripherals (DPPs), each integrating a dedicated error ADC (EADC), 2-pole-2-zero configurable PID filter, and high-resolution DPWM outputs - enabling simultaneous regulation of primary-side voltage, secondary-side current, and input bus voltage. Its EADC achieves 1 mV/LSB resolution with adaptive sample triggering and 8× oversampling.
It features a 14-channel 12-bit general-purpose ADC (267 ksps), seven high-speed analog comparators for cycle-by-cycle current limiting, and hardware-based synchronous rectifier dead-time optimization coordinated with UCD7138 drivers. The device supports automatic mode switching between PWM, phase-shift, and frequency modulation without control-loop interruption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPWM Resolution | 250 ps pulse width resolution enables precise duty-cycle control at high frequencies, critical for zero-voltage switching in LLC resonant converters. |
| Max Switching Frequency | 2 MHz allows use in high-density, high-efficiency isolated DC-DC modules and multi-phase PFC designs. |
| EADC Resolution | Configurable down to 1 mV/LSB with automatic resolution selection, supporting accurate low-voltage feedback in 48 V–12 V intermediate bus converters. |
| Control Loops | 3 independent hardware PID loops with nonlinear control and feed-forward enable simultaneous regulation of output voltage, current, and input line conditions. |
| Processor Core | 31.25-MHz ARM7TDMI-S with 32 KB flash and 4 KB RAM executes real-time monitoring, fault management, and field firmware updates via PMBus or UART. |
| Analog Comparators | 7 high-speed comparators with programmable blanking time provide cycle-by-cycle overcurrent protection for primary and secondary side MOSFETs. |
| Operating Temperature | –40°C to +125°C junction temperature rating supports deployment in industrial and telecom power supplies with extended thermal margins. |
Pinout & Package
UCD3138ARJAR is housed in a 40-pin WQFN package (6.00 mm × 6.00 mm, RMH drawing), with exposed thermal pad tied to AGND/DGND for enhanced thermal performance and board-level reliability under temperature cycling per IPC-9592A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPWM0A / DPWM0B | Dual-edge DPWM output pair | Drives high-side/low-side switches in half-bridge or full-bridge topology with adjustable dead-time and phase shift. |
| EAP0 / EAN0 | Differential error amplifier input 0 | Accepts isolated feedback signal (e.g., from optocoupler or transformer) for primary-side voltage regulation loop. |
| AD03 | ADC channel 3 with comparator B/C inputs | Monitors input bus voltage for undervoltage/overvoltage protection and feed-forward compensation. |
| PMBUS_CLK / PMBUS_DATA | Open-drain SMBus-compatible interface | Enables real-time telemetry (VOUT, IOUT, temperature), configuration, and fault logging in server PSU and telecom rectifier systems. |
| FAULT2 | Dedicated external fault input | Triggers immediate shutdown on secondary-side overtemperature or overcurrent events detected by external sensors. |
| TCK / TDO / TDI / TMS | JTAG debug interface | Supports Code Composer Studio™-based firmware development, live register inspection, and in-circuit debugging during validation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectifier Dead-Time Optimization | Hardware engine dynamically adjusts SR gate timing based on load and temperature to minimize conduction loss and prevent shoot-through in LLC and PSFB converters. |
| Burst Mode & Ideal Diode Emulation | Reduces standby power below 100 mW while maintaining tight output regulation and enabling seamless transition into active operation at light loads. |
| Hardware-Based Input Voltage Feed Forward | Compensates for line transients within one switching cycle, improving transient response in telecom rectifiers subjected to wide AC input variations. |
| Flux and Phase Current Balancing | Enables interleaved multi-phase PFC and dual-active-bridge isolation with automatic current sharing across parallel channels without external controllers. |
| Current Share Bus Support | Allows master/slave or average-current sharing across multiple UCD3138ARJAR units in redundant or high-power modular PSUs. |
Applications
| Telecom Rectifier | Server PSU |
|---|---|
Use Scenario: 48 V DC output from –54 V to –60 V AC-input rectification in central office and data center infrastructure. IC Role / Device Role / Timing Role: Primary-side digital controller managing dual-interleaved boost PFC and isolated LLC DC-DC stage with PMBus telemetry. Use Value: Achieves >96% efficiency at 50% load and meets Level VI efficiency requirements through burst mode, ideal diode emulation, and adaptive dead-time control. |
Use Scenario: 12 V or 54 V intermediate bus generation in 1U/2U rack-mounted server power supplies with hot-swap capability. IC Role / Device Role / Timing Role: Dual-loop controller regulating both input PFC stage and downstream isolated DC-DC converter, synchronized across multiple rails. Use Value: Enables single-chip management of input/output telemetry, fault logging, and dynamic load-line adjustment via PMBus for CPU/GPU VRM coordination. |
| Industrial Isolated DC-DC | EV Charging Module |
Use Scenario: 24 V or 48 V isolated output from 300–800 V DC input in factory automation and motor drive auxiliary supplies. IC Role / Device Role / Timing Role: High-reliability digital controller implementing phase-shifted full-bridge with flux balancing and copper trace current sensing. Use Value: Eliminates need for external current transformers or shunt amplifiers via integrated copper trace sensing and supports 125°C ambient operation. |
Use Scenario: Secondary-side regulation in 3.3 kW–6.6 kW AC/DC on-board chargers (OBC) with bidirectional capability. IC Role / Device Role / Timing Role: Controller for isolated DC-DC stage handling variable battery voltage (200–450 V) and enabling constant-current/constant-voltage charge profiles. Use Value: Hardware-accelerated constant current/power control and fast mode switching ensure compliance with ISO 15118 and SAE J1772 communication timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD3138ARGC | 64-pin VQFN package with 14-channel ADC, 4 fault inputs, 2 UARTs, and full GPIO count (30 pins). | Required for complex multi-rail systems needing additional ADC channels, external interrupt support, or dual SCI interfaces. | Select UCD3138ARGC when design requires >7 ADC channels or external interrupt-driven event handling not supported in RJA/RMH packages. |
| UCD3138ARMH | Identical 40-pin WQFN footprint and pinout to UCD3138ARJAR but optimized for improved temperature cycling reliability (IPC-9592A BLR). | Preferred for new designs targeting extended board-level reliability in harsh thermal environments (e.g., outdoor telecom cabinets). | UCD3138ARMH is recommended for new 40-pin designs where enhanced solder-joint reliability under thermal stress is critical. |
Compared with UCD3138ARJAR, UCD3138ARGC provides greater peripheral headroom for scalable multi-output systems, while UCD3138ARMH delivers identical functionality with superior board-level reliability metrics - making RJA suitable for cost-sensitive legacy upgrades and RMH optimal for new high-reliability deployments.
Availability
UCD3138ARJAR is available at Aetrix Electronics and suitable for telecom rectifiers, server PSUs, industrial isolated DC-DC converters, and EV charging modules requiring stable component supply across long product lifecycles.
Supply support for UCD3138ARJAR 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 decades of expertise in digital power control ICs and system-level reference designs.
The UCD3138A product line was designed specifically for high-efficiency, high-density isolated power conversion - targeting telecom, enterprise computing, and industrial applications where programmability, integration, and thermal robustness are critical.
FAQ
What is the package type and pin count of UCD3138ARJAR?
UCD3138ARJAR uses a 40-pin WQFN package (6.00 mm × 6.00 mm) with corner anchors and an exposed thermal pad. It shares the same pinout as UCD3138ARMH and is distinct from the 64-pin RGC variant. The RJA package is optimized for cost-effective, high-volume telecom and industrial power supply designs where full peripheral count is not required.
Does UCD3138ARJAR support PMBus communication?
Yes, UCD3138ARJAR supports full PMBus v1.2 compliance via dedicated open-drain PMBUS_CLK and PMBUS_DATA pins. It enables read/write access to telemetry registers (output voltage, current, temperature), configuration parameters (compensation coefficients, fault thresholds), and event logs - essential for smart power system management in data centers and telecom infrastructure.
How many independent digital control loops does UCD3138ARJAR implement?
UCD3138ARJAR implements three independent digital control loops using dedicated Digital Power Peripherals (DPPs). Each DPP includes a hardware PID compensator, configurable 2-pole-2-zero filter, and associated DPWM outputs - allowing simultaneous regulation of voltage, current, and input line conditions in complex topologies like dual-phase PFC + isolated LLC.
What is the maximum DPWM switching frequency supported by UCD3138ARJAR?
UCD3138ARJAR supports DPWM switching frequencies up to 2 MHz. This enables use in high-frequency resonant converters such as LLC half-bridge and full-bridge topologies, reducing magnetics size and improving power density - particularly valuable in space-constrained server and telecom power supplies.
Can UCD3138ARJAR perform hardware-based synchronous rectifier control?
Yes, UCD3138ARJAR includes a dedicated synchronous rectifier (SR) peripheral that performs hardware-based dead-time optimization and soft-on/soft-off sequencing for UCD7138-compatible drivers. This eliminates software latency and ensures precise timing alignment between primary-side PWM and secondary-side SR gate signals - critical for efficiency in high-current LLC and PSFB converters.
UCD3138ARJAR 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)
UCD3138ARJAR FAQ
1.How can I place an order for UCD3138ARJAR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3138ARJAR 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 UCD3138ARJAR reliable?
The price and inventory of UCD3138ARJAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3138ARJAR is usually 5 days.
3.What payment methods are accepted for UCD3138ARJAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3138ARJAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3138ARJAR?
UCD3138ARJAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3138ARJAR 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 UCD3138ARJAR?
For technical support, including UCD3138ARJAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3138ARJAR requirements.
6.How does Aetrix verify that UCD3138ARJAR is sourced from the original manufacturer or authorized distributors?
All UCD3138ARJAR 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 UCD3138ARJAR meets industry standards.
7.What is the process for return or replacement of UCD3138ARJAR?
All UCD3138ARJAR units undergo pre-shipment inspection (PSI). If there is an issue with UCD3138ARJAR, 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 UCD3138ARJAR part is unused and in its original packaging.
Return procedure for UCD3138ARJAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCD3138ARJAR 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…
