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Texas Instruments UCD3028RHAT
- Part No.:
- UCD3028RHAT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
UCD3028RHAT.pdf
- Description:
- IC DGTL PWR CTRLR 40VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
UCD3028RHAT from Texas Instruments is a digital power controller IC implementing dual high-resolution digital pulse-width modulation (DPWM) for voltage-mode or average-current-mode control in isolated/non-isolated DC-DC converters. It features 2 independent feedback loops, 250-ps DPWM pulse-width resolution, 31.25-MHz ARM7 CPU, and operates from –40°C to 125°C in 40-pin QFN (RHA) package - used in telecom rectifiers and server VRMs.
For engineers reviewing the UCD3028RHAT datasheet, UCD3028RHAT pinout, UCD3028RHAT application, or UCD3028RHAT equivalent, key selection factors include its dual-loop digital compensation capability, 40-pin RHA package footprint, absence of JTAG interface, and support for up to 2-MHz switching frequency with programmable dead time and phase shift between DPWM pairs.
Technical Context
The UCD3028RHAT integrates two Fusion Digital Power™ peripherals (FDPP), each comprising a dedicated error ADC (EAP/EAN inputs), three-pole/three-zero digital compensator, and dual DPWM outputs. Its ARM7 core executes real-time control algorithms from 32-KB flash memory while managing PMBus/SCI/SPI communications and fault monitoring via four analog comparators and 9-channel 12-bit ADC.
Unlike UCD3040 and UCD3020, the UCD3028RHAT supports only two regulated output voltages and omits JTAG debug interface - confirmed by TI's product selection matrix and functional block diagrams. Its SYNC_IN/SYNC_OUT pins enable synchronization across multiple UCD30xx devices, and internal regulator control manages external pass elements for single-supply operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DPWM Resolution | 250-ps pulse-width resolution enables fine-grained duty-cycle control for high-efficiency, low-noise power stages. |
| Max Switching Frequency | Up to 2 MHz supports resonant LLC and high-frequency isolated topologies without external clocking. |
| Feedback Loops | 2 independent high-speed error ADC + 3P3Z compensator channels for dual-output or multiphase current-balanced designs. |
| CPU Core | 31.25-MHz 32-bit ARM7 RISC processor executes closed-loop control, supervision, and communication tasks in real time. |
| ADC Channels | 9-channel 12-bit, 200-ksps general-purpose ADC monitors input/output voltage, current, temperature, and auxiliary signals. |
| Operating Temp | –40°C to 125°C ambient rating qualifies for industrial and telecom power supply environments with extended thermal margins. |
| Package | 40-pin QFN (RHA), 6 mm × 6 mm, with exposed thermal pad - optimized for compact, thermally demanding board layouts. |
Pinout & Package
UCD3028RHAT uses a 40-pin QFN package (RHA) with 0.5-mm pitch and exposed thermal pad. Pin functions are multiplexed across DPWM, fault inputs, ADC, PMBus, SCI, and GPIO resources - no JTAG pins included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GPIO_00/DPWM-1A GPIO_01/DPWM-1B | Dual-phase DPWM output pair | Generates complementary high-resolution PWM signals for synchronous buck or half-bridge primary-side drive. |
| GPIO_02/DPWM-2A GPIO_03/DPWM-2B | Dual-phase DPWM output pair | Enables interleaved operation for reduced input/output ripple and improved thermal distribution in multiphase VRMs. |
| EAP1/EAN1 EAP2/EAN2 | Differential error ADC inputs | Accepts precision voltage feedback from isolated error amplifiers or shunt-based current sensing networks. |
| GPIO_08/FAULT-1A GPIO_10/FAULT-2A | External fault inputs | Support fast overcurrent/overvoltage shutdown with configurable response timing and latching behavior. |
| PMBUS-CLK/PMBUS-DATA | PMBus interface | Enables standard digital communication for telemetry, configuration, and fault logging in smart power systems. |
| SCI_TX/SCI_RX | UART serial interface | Provides asynchronous host communication for firmware updates, debug logging, or custom protocol integration. |
| SYNC_IN / SYNC_OUT | Timing synchronization | Allows precise alignment of DPWM edges across multiple UCD3028RHAT or UCD30xx controllers in parallel power modules. |
Key Features
| Feature | Design Value |
|---|---|
| Dual FDPP Control Loops | Each loop includes dedicated EADC, 3P3Z digital compensator, and DPWM pair - enabling independent regulation of two outputs or current balancing in dual-phase topologies. |
| 250-ps DPWM Resolution | Delivers sub-nanosecond timing granularity for ultra-precise duty cycle control, critical for high-frequency zero-voltage-switching (ZVS) operation. |
| No JTAG Interface | Omits TCK/TMS/TDO/TDI pins - reduces pin count and simplifies layout but requires SCI or PMBus for firmware programming and debug. |
| Programmable Dead Band | Configurable delay between complementary DPWM outputs prevents shoot-through in bridge-leg configurations without external logic. |
| Internal Regulator Control | Drives external pass transistor for local 1.8-V/3.3-V generation - eliminates need for discrete LDOs in single-supply system designs. |
Applications
| Telecom Rectifiers | Server VRMs |
|---|---|
Use Scenario: High-density 48-V to 12-V/5-V DC-DC conversion in telecom shelf power systems with strict efficiency and transient response requirements. IC Role / Device Role / Timing Role: Primary digital controller managing dual-output regulation, adaptive voltage positioning (AVP), and PMBus telemetry reporting. Use Value: 250-ps DPWM resolution and dual 3P3Z compensators enable <50-µs load-step recovery and >95% peak efficiency at 1-MHz switching. | Use Scenario: Multiphase point-of-load (POL) converter supplying CPU/GPU cores in datacenter servers with dynamic voltage scaling. IC Role / Device Role / Timing Role: Dual-loop controller synchronizing two interleaved phases while monitoring per-phase current via EADC inputs. Use Value: Programmable phase shift and dead band reduce input capacitor RMS current by 30% and eliminate external gate-drive timing components. |
| Industrial AC-DC Supplies | Medical Power Modules |
Use Scenario: Isolated 230-V AC to 24-V/12-V DC conversion in programmable logic controller (PLC) power supplies requiring reinforced isolation and safety certification. IC Role / Device Role / Timing Role: Voltage-mode controller driving flyback or forward topology with integrated fault protection and soft-start sequencing. Use Value: Four high-speed analog comparators and 9-channel ADC provide redundant overvoltage, overtemperature, and open-loop detection meeting IEC 62368-1 requirements. | Use Scenario: Compact, low-noise 24-V to ±15-V/5-V isolated DC-DC module for patient-connected diagnostic equipment with stringent EMI and leakage limits. IC Role / Device Role / Timing Role: Resonant-mode controller for LLC half-bridge with adaptive frequency control and valley-switching optimization. Use Value: 2-MHz DPWM capability and 31.25-MHz ARM7 core enable real-time frequency dithering and spread-spectrum modulation to meet CISPR 11 Class B conducted emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD3028RMHT | Same silicon, identical electrical specs, but in thinner 40-pin RMH QFN package with corner anchor pins for enhanced solder joint reliability. | Preferred for high-reliability, high-vibration environments (e.g., transportation, aerospace) where mechanical robustness is prioritized over thermal dissipation. | Select UCD3028RMHT when board-level shock/vibration testing is required; UCD3028RHAT remains optimal for standard industrial thermal management. |
| UCD3020RGZT | 48-pin QFN variant with same dual-loop architecture but adds two additional DPWM outputs (total 4), two more fault inputs, and full JTAG debug support. | Suitable for more complex topologies like dual-output forward converters or three-phase interleaved PFC where extra PWM/fault resources are needed. | Choose UCD3020RGZT if future design scalability or on-chip debug access is required; UCD3028RHAT offers cost and footprint advantage for fixed dual-phase use cases. |
Compared with UCD3028RMHT, the UCD3028RHAT provides identical control performance but trades mechanical reinforcement for slightly better thermal conduction via larger thermal pad exposure; versus UCD3020RGZT, it sacrifices JTAG and two DPWM channels to achieve smaller size and lower BOM cost in space-constrained dual-output applications.
Availability
UCD3028RHAT is available at Aetrix Electronics and suitable for telecom rectifiers, server VRMs, and industrial AC-DC power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCD3028RHAT 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 company specializing in analog, embedded processing, and power management technologies with broad industrial and automotive design-in leadership.
The UCD30xx family was designed specifically for digitally controlled AC-DC and DC-DC power conversion - delivering programmable, high-resolution PWM, integrated compensation, and industry-standard communication interfaces in a single chip.
FAQ
What is the maximum DPWM switching frequency supported by the UCD3028RHAT?
The UCD3028RHAT supports up to 2 MHz DPWM switching frequency, enabling high-efficiency operation in resonant LLC, active clamp forward, and other high-frequency isolated topologies. This specification is confirmed in TI's SLUS868H datasheet Section 7.3 and applies directly to the UCD3028RHAT device variant.
Does the UCD3028RHAT include JTAG debug capability?
No, the UCD3028RHAT does not include JTAG functionality. TI's product selection matrix explicitly marks JTAG as unavailable for UCD3028 devices. Firmware development and debugging must be performed via SCI (UART) or PMBus interfaces - both fully supported on the UCD3028RHAT.
How many independent feedback loops does the UCD3028RHAT support?
The UCD3028RHAT supports two independent high-speed feedback loops, each with dedicated error ADC inputs (EAP1/EAN1 and EAP2/EAN2), 3-pole/3-zero digital compensator, and dual DPWM outputs. This is verified in TI's SLUS868H datasheet Table 1 and functional block diagram for the RHA package.
What package type and dimensions does the UCD3028RHAT use?
The UCD3028RHAT uses a 40-pin QFN package with RHA designation: 6 mm × 6 mm body, 0.5-mm pitch, and exposed thermal pad. Pin assignments match the RHA top-view layout shown in Figure 10 of TI's SLUS868H datasheet, confirming mechanical and thermal compatibility with standard QFN reflow profiles.
Can the UCD3028RHAT synchronize with other UCD30xx devices?
Yes, the UCD3028RHAT supports inter-device synchronization via dedicated SYNC_IN and SYNC_OUT pins, allowing precise alignment of DPWM waveforms across multiple UCD3028RHAT or mixed UCD30xx controllers. This capability is documented in TI's SLUS868H datasheet Section 1.3 and applies to all UCD3028 variants including UCD3028RHAT.
UCD3028RHAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Fusion Digital Power™
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- General Purpose
- Current - Supply:
- 60mA
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-VQFN (6x6)
UCD3028RHAT FAQ
1.How can I place an order for UCD3028RHAT through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD3028RHAT 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 UCD3028RHAT reliable?
The price and inventory of UCD3028RHAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD3028RHAT is usually 5 days.
3.What payment methods are accepted for UCD3028RHAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD3028RHAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD3028RHAT?
UCD3028RHAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD3028RHAT 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 UCD3028RHAT?
For technical support, including UCD3028RHAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD3028RHAT requirements.
6.How does Aetrix verify that UCD3028RHAT is sourced from the original manufacturer or authorized distributors?
All UCD3028RHAT 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 UCD3028RHAT meets industry standards.
7.What is the process for return or replacement of UCD3028RHAT?
All UCD3028RHAT units undergo pre-shipment inspection (PSI). If there is an issue with UCD3028RHAT, 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 UCD3028RHAT part is unused and in its original packaging.
Return procedure for UCD3028RHAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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