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Texas Instruments UCD3138ARMHR
- Part No.:
- UCD3138ARMHR
- Manufacturer:
- Texas Instruments
- Category:
- Power Supply Controllers, Monitors
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
UCD3138ARMHR.pdf
- Description:
- IC DGTL PWR CTRLR 40WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,787
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Product details
Overview
UCD3138ARMHR 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 phase-shifted full-bridge, LLC, and PFC topologies in telecom rectifiers and server power supplies.
For engineers reviewing the UCD3138ARMHR datasheet, UCD3138ARMHR pinout, UCD3138ARMHR application, or UCD3138ARMHR equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for digital power supply design and migration.
Technical Context
The UCD3138ARMHR implements three dedicated Digital Power Peripherals (DPPs), each integrating an error ADC (EADC), 2-pole-2-zero configurable compensator, and high-resolution DPWM outputs - enabling simultaneous voltage-mode, peak-current-mode, or constant-power regulation. Its hardware-accelerated control path bypasses CPU latency for cycle-by-cycle response.
It integrates a 14-channel 12-bit general-purpose ADC (267 ksps), seven high-speed analog comparators with cycle-by-cycle current limiting, and synchronous rectifier dead-time optimization logic compatible with UCD7138 drivers. The device supports burst mode, ideal diode emulation, and automatic mode switching between PWM, phase-shift, and frequency modulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPWM Resolution | 250-ps pulse width resolution enables precise timing control for high-frequency resonant converters. |
| Max Switching Frequency | 2 MHz supports high-density LLC and phase-shifted full-bridge designs without external clock scaling. |
| EADC Resolution | Configurable down to 1 mV/LSB with 8× oversampling and hardware averaging for stable feedback under noise. |
| Control Loops | 3 independent hardware PID loops allow multi-output or redundant regulation without CPU overhead. |
| Processor Core | 31.25-MHz ARM7TDMI-S executes field-upgradable firmware via PMBus/UART and manages system-level sequencing. |
| ADC Channels | 14-channel 12-bit general-purpose ADC (267 ksps) with dual sample-and-hold for synchronized sensing. |
| Operating Temp | –40°C to +125°C junction temperature rating supports industrial and telecom power supply deployment. |
Pinout & Package
UCD3138ARMHR uses a 40-pin WQFN (RMH) package, 6.00 mm × 6.00 mm, with exposed thermal pad and corner anchors optimized for board-level reliability per IPC-9592A temperature cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DPWM0A / DPWM0B | Digital PWM output pair | Complementary high-resolution outputs for primary-side half/full-bridge drive with adjustable dead time. |
| EAP0 / EAN0 | Differential error amplifier input | High-precision feedback path for primary-side voltage or current sensing with 1-mV LSB resolution capability. |
| AD03 | Analog input channel | Shared input for comparators B/C - used for overvoltage/undervoltage protection with programmable blanking. |
| PMBUS_CLK / PMBUS_DATA | PMBus interface pins | Open-drain SMBus-compliant interface for configuration, telemetry, and fault logging in standards-compliant systems. |
| TCK / TDO / TDI / TMS | JTAG debug interface | Fully supported boundary-scan and Code Composer Studio™ integration for real-time firmware debugging. |
| FAULT2 | External fault input | Dedicated hardware fault pin with programmable response - triggers immediate shutdown without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Rectifier Optimization | Hardware-dead-time computation engine synchronizes with UCD7138 drivers to minimize conduction loss and prevent shoot-through. |
| Input Voltage Feed Forward | Dedicated analog hardware path adjusts DPWM duty cycle in real time to suppress line-induced output ripple. |
| Burst Mode & Ideal Diode Emulation | Automated light-load efficiency enhancement via gate-controlled MOSFET emulation - no external circuitry required. |
| Copper Trace Current Sensing | Integrated front-end supports direct PCB trace sensing with offset calibration and temperature compensation. |
| Current Share Bus Support | Hardware-averaged or master/slave topology enables parallel operation of multiple UCD3138ARMHR controllers with <±1% load mismatch. |
Applications
| Telecom Rectifier | Server PSU |
|---|---|
|
Use Scenario: 48-V input, 12-V/54-A isolated DC-DC module in carrier-grade telecom infrastructure with strict hold-up and transient response requirements. IC Role / Device Role / Timing Role: Primary-side digital controller managing phase-shifted full-bridge topology with synchronous rectification and adaptive dead-time tuning. Use Value: 250-ps DPWM resolution enables sub-nanosecond timing alignment across phases, reducing circulating current and improving efficiency at 1-MHz switching. |
Use Scenario: 380-V DC input, 12-V/200-A server power supply using dual-interleaved PFC + LLC resonant conversion in OCP-compliant rack systems. IC Role / Device Role / Timing Role: Dual-role controller executing PFC loop on DPP0 and LLC regulation on DPP1/DPP2 with inter-loop coordination via shared current bus. Use Value: Hardware-based current sharing and burst-mode control maintain >95% efficiency down to 5% load while meeting 80 PLUS Titanium requirements. |
| Industrial UPS | Medical Isolated DC-DC |
|
Use Scenario: 24-V battery-backed 400-W UPS with bidirectional capability, requiring fast mode switching between line-interactive and battery-inverter operation. IC Role / Device Role / Timing Role: Real-time supervisor coordinating PWM, phase-shift, and frequency modulation modes with seamless transitions and zero-crossing synchronization. Use Value: Automatic smooth mode switching eliminates output glitches during transfer - critical for maintaining clean power to sensitive loads. |
Use Scenario: 24-V input, 5-V/3-A isolated medical DC-DC converter certified to IEC 60601-1 with reinforced insulation and low leakage current. IC Role / Device Role / Timing Role: Safety-critical controller implementing primary-side voltage sensing, copper-trace current monitoring, and dual-redundant fault detection paths. Use Value: Seven hardware comparators with programmable blanking enable independent overcurrent, overvoltage, and overtemperature responses within <100 ns - satisfying BF-rated isolation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD3138ARGCR | 64-pin VQFN (9 mm × 9 mm); includes 14-channel ADC, 2 UARTs, 4 fault inputs, and external interrupt support. | Required for designs needing full ADC channel count, dual SCI interfaces, or complex fault tree management. | Select UCD3138ARGCR when layout allows larger footprint and system demands full peripheral set - not pin-compatible with UCD3138ARMHR. |
| UCD3138AMRHR | Same 40-pin WQFN package but with enhanced BLR qualification per IPC-9592A; identical electrical specs and pinout. | Targeted for high-reliability industrial and automotive applications requiring extended temperature cycling validation. | UCD3138AMRHR is a drop-in replacement for UCD3138ARMHR with improved board-level reliability - same pinout, same firmware. |
Compared with UCD3138ARMHR, UCD3138ARGCR offers expanded I/O and ADC resources at the cost of larger area and higher BOM cost, while UCD3138AMRHR provides identical functionality with certified thermal cycling robustness - making it the preferred choice for mission-critical deployments where solder-joint integrity is paramount.
Availability
UCD3138ARMHR is available at Aetrix Electronics and suitable for telecom rectifiers, server PSUs, and industrial UPS systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for UCD3138ARMHR 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 architecture and high-reliability IC design.
The UCD3138A product line was designed specifically for digitally controlled isolated power conversion - delivering hardware-accelerated control loops, integrated protection, and firmware flexibility to replace discrete analog controllers in telecom, enterprise, and industrial power systems.
FAQ
What is the package type and footprint compatibility of UCD3138ARMHR?
UCD3138ARMHR uses a 40-pin WQFN package (RMH), 6.00 mm × 6.00 mm, with corner anchors and exposed thermal pad. It is not footprint-compatible with the 64-pin RGC variant (UCD3138ARGCR) due to different pin count and layout. However, it shares identical pinout and electrical behavior with UCD3138AMRHR, enabling direct substitution in existing RMH-based designs.
Does UCD3138ARMHR support phase-shifted full-bridge topologies?
Yes, UCD3138ARMHR natively supports phase-shifted full-bridge control through its DPWM modules, which provide adjustable phase-shift between output pairs, cycle-by-cycle duty-cycle matching, and hardware-based dead-band tuning. Its three independent DPPs allow full implementation of primary-side regulation, secondary-side synchronous rectification control, and auxiliary rail management in a single device.
How many hardware-based digital control loops does UCD3138ARMHR implement?
UCD3138ARMHR implements three independent hardware-based digital control loops (DPPs), each comprising a dedicated error ADC, 2-pole-2-zero PID compensator, and associated DPWM outputs. These operate autonomously from the ARM7 core, enabling deterministic sub-microsecond loop response times without CPU scheduling dependency.
Can UCD3138ARMHR be programmed in-system after soldering?
Yes, UCD3138ARMHR supports field firmware updates via PMBus or UART interfaces. Its 32 KB program flash and 2 KB data flash with ECC allow secure, in-circuit reprogramming of control algorithms, protection thresholds, and telemetry parameters - eliminating the need for socketed programming or rework during production or field service.
What fault protection features are integrated into UCD3138ARMHR?
UCD3138ARMHR integrates seven high-speed analog comparators with programmable blanking, ten digital comparators, cycle-by-cycle current limiting, four dedicated fault inputs (FAULT0–FAULT3), and hardware-triggered shutdown. Fault responses execute independently of firmware, ensuring <100-ns reaction to overcurrent, overvoltage, or thermal events - critical for safety-certified power systems.
UCD3138ARMHR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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-WQFN (6x6)
UCD3138ARMHR FAQ
1.How can I place an order for UCD3138ARMHR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3138ARMHR 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 UCD3138ARMHR reliable?
The price and inventory of UCD3138ARMHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3138ARMHR is usually 5 days.
3.What payment methods are accepted for UCD3138ARMHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3138ARMHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3138ARMHR?
UCD3138ARMHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3138ARMHR 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 UCD3138ARMHR?
For technical support, including UCD3138ARMHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3138ARMHR requirements.
6.How does Aetrix verify that UCD3138ARMHR is sourced from the original manufacturer or authorized distributors?
All UCD3138ARMHR 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 UCD3138ARMHR meets industry standards.
7.What is the process for return or replacement of UCD3138ARMHR?
All UCD3138ARMHR units undergo pre-shipment inspection (PSI). If there is an issue with UCD3138ARMHR, 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 UCD3138ARMHR part is unused and in its original packaging.
Return procedure for UCD3138ARMHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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