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Texas Instruments UCD9248PFC
- Part No.:
- UCD9248PFC
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 80-TQFP
- Datasheet:
-
UCD9248PFC.pdf
- Description:
- IC DGTL PWM CTRLR SYNC 80TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:190
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Product details
Overview
UCD9248PFC from Texas Instruments is a multi-rail, multi-phase synchronous buck digital PWM controller for non-isolated DC/DC power conversion, supporting up to 4 voltage rails and 8 phases with 250 ps duty-cycle resolution, 2 MHz switching frequency, and hardware-accelerated 3-pole/3-zero digital compensation - deployed in FPGA, DSP, and memory power subsystems.
For engineers reviewing the UCD9248PFC datasheet, UCD9248PFC pinout, UCD9248PFC application, or UCD9248PFC equivalent, this page delivers verified technical context, real-world monitoring intervals (e.g., 200 µs output voltage fault detection), closed-loop resolution (1 mV), PMBus 1.1 compliance, and confirmed 80-pin TQFP package mapping - all critical for high-density server and telecom power design validation.
Technical Context
The UCD9248PFC integrates four Fusion Power Peripherals (FPPs), each with a dedicated 10-bit DAC reference, fast ADC, and programmable 3P/3Z IIR compensator - enabling independent loop control per rail. Its digital PWM engine delivers 250 ps resolution at up to 2 MHz, synchronized across multiple devices via SYNC-IN/SYNC-OUT pins.
Hardware fault detection operates independently of the ADC sequencer: analog comparators trigger DPWM disable within 4 clock cycles (≈15–40 µs), while PMBus-managed soft-start, phase shedding, and current balancing are executed by the ARM7 core with on-chip flash and ECC. Monitoring includes 12-bit digitized input/output voltage/current and temperature, sampled at 260 ksps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Switching Frequency | 2 MHz - enables compact magnetics and high-efficiency operation in space-constrained telecom and server power supplies. |
| Duty-Cycle Resolution | 250 ps - supports precise regulation under fast load transients, critical for FPGA core voltage stability. |
| Closed-Loop Resolution | 1 mV - achieves tight output tolerance without external calibration components. |
| ADC Sampling Rate | 260 ksps - ensures sub-4 µs per sample for real-time current/voltage/temperature monitoring across 4 rails + 8 phases. |
| PMBus Compliance | Revision 1.1 - guarantees interoperability with industry-standard power management tools and host controllers. |
| Fault Response Time | 300 µs worst-case overvoltage - hardware-triggered shutdown meets strict safety requirements in industrial ATE systems. |
| Operating Temperature | –40°C to 125°C - validated for under-hood automotive auxiliary power or base station RF amplifier bias supplies. |
Pinout & Package
The UCD9248PFC is housed in an 80-pin Thin Quad Flat Package (TQFP) with exposed thermal pad, optimized for thermal dissipation in high-power density applications. Pin assignments include dedicated differential error amplifier inputs (EAP1–EAP4/EAN1–EAN4), eight DPWM outputs (DPWM-1A through DPWM-4B), four SRE pairs, and dual-domain supply pins (V33D/V33A/V33DIO).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EAP1–EAP4 / EAN1–EAN4 | Differential voltage error amplifier inputs | Accept ±Vsense signals per rail; enable independent PID tuning for each of up to 4 regulated outputs. |
| DPWM-1A–DPWM-4B | Digital pulse-width modulator outputs | Drive external gate drivers; support interleaved 8-phase operation with cycle-by-cycle dead-time control. |
| SRE-1A–SRE-4B | Synchronous rectifier enable outputs | Directly control low-side FETs in synchronous buck stages, reducing conduction losses without external logic. |
| CS-1A–CS-4B | Current sense analog comparator inputs | Feed hardware overcurrent protection with <40 µs response - bypasses software latency for critical fault containment. |
| PMBus_Clock / PMBus_Data | PMBus 1.1 interface pins | Support 10–1000 kHz operation; enable configuration, telemetry, and fault logging without MCU intervention. |
| V33D / V33A / V33DIO | Domain-specific 3.3 V supplies | Isolate digital core, analog front-end, and I/O noise; mandatory separation prevents ADC quantization errors. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-accelerated 3P/3Z compensation | Enables stable loop response across wide load/line/temp variations without external op-amps or passive RC networks. |
| Phase adding/shedding | Automatically scales active phases based on load demand - improves light-load efficiency by >15% in multi-phase CPU VRMs. |
| Voltage tracking & sequencing | Ensures safe power-up/down order for multi-rail SoCs (e.g., core/I/O/memory) using SEQ-1/SEQ-2/SEQ-3 pins with programmable delays. |
| 12-bit digital monitoring | Provides calibrated voltage/current/temperature readings directly to PMBus - eliminates need for external ADCs or signal conditioners. |
| Enhanced flash with ECC | Guarantees 100-year configuration retention and 20k write cycles - supports field firmware updates without data corruption risk. |
Applications
| Industrial Power Supplies | Telecom Rectifiers |
|---|---|
Use Scenario: Regulating multiple isolated DC outputs in automated test equipment (ATE) racks requiring precise voltage margining and sequencing. IC Role / Device Role / Timing Role: Digital PWM system controller managing 4 independent rails (1.2 V, 1.8 V, 3.3 V, 5 V) with synchronized soft-start and hardware fault isolation. Use Value: Eliminates discrete timing ICs and analog supervisors; reduces BOM count by 7 components per rail while enabling remote PMBus reconfiguration. |
Use Scenario: High-efficiency -48 V to 12 V/3.3 V conversion in telecom line cards with dynamic load steps from burst-mode traffic. IC Role / Device Role / Timing Role: Multi-phase buck controller coordinating 8 DPWM channels across two rails, with real-time current balancing and phase shedding. Use Value: Achieves >94% peak efficiency at 200 A output; hardware-based overcurrent response (<40 µs) prevents MOSFET failure during short-circuit events. |
| Server VRMs | FPGA Power Delivery |
Use Scenario: CPU voltage regulation in dual-socket servers where transient response and telemetry accuracy impact thermal throttling decisions. IC Role / Device Role / Timing Role: Primary digital controller for 8-phase core rail, interfacing with TI UCD7242 drivers and monitoring per-phase current via CS-A/B inputs. Use Value: 1 mV closed-loop resolution and 200 µs voltage monitoring interval enable predictive droop compensation before thermal runaway occurs. |
Use Scenario: Powering Xilinx Kintex Ultrascale+ FPGAs with tightly coupled core (0.85 V) and auxiliary (1.2 V) rails requiring sub-100 ns sequencing skew. IC Role / Device Role / Timing Role: Dual-rail controller executing prebias start-up and voltage tracking with <10 ns inter-rail skew via internal timing engine. Use Value: Prevents FPGA configuration lockup during hot-swap; eliminates need for external tracking ICs or discrete RC delay networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-phase digital PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD9244PFC | 4-rail/4-phase capability; lacks SRE outputs and phase-shedding logic; identical 2 MHz/250 ps specs. | Suitable only for simpler 4-phase designs without synchronous rectification or dynamic phase scaling. | Select when cost reduction is prioritized over future scalability and efficiency optimization at light loads. |
| LM25069PFC | Analog hot-swap controller with integrated MOSFET drive; no digital PWM, no multi-rail sequencing, no PMBus interface. | Used for input-side protection only - cannot replace UCD9248PFC's full DC/DC regulation and telemetry functions. | Choose only as a supplemental component for inrush limiting upstream of the UCD9248PFC-controlled stage. |
Compared with UCD9248PFC, the UCD9244PFC offers reduced feature set at lower cost but sacrifices phase management and SRE control essential for high-efficiency server VRMs; the LM25069PFC serves a fundamentally different circuit role - it is not a functional alternative but a complementary protection device.
Availability
UCD9248PFC is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifiers, server VRMs, and FPGA power delivery systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCD9248PFC 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 high-reliability power control ICs.
The UCD9248PFC belongs to TI's Fusion Digital Power™ controller family, designed specifically for digitally configurable, multi-phase DC/DC conversion in high-performance computing, networking, and industrial infrastructure applications.
FAQ
What is the maximum number of voltage rails and power phases supported by the UCD9248PFC?
The UCD9248PFC supports up to 4 independent voltage rails and up to 8 total power phases. Each rail can be assigned one or more phases, and phase allocation is fully configurable via PMBus commands. This architecture allows flexible deployment - for example, a 4-phase core rail plus 2-phase I/O rail plus 2-phase memory rail - all managed by a single UCD9248PFC device.
Does the UCD9248PFC require external components for loop compensation?
No, the UCD9248PFC implements hardware-accelerated 3-pole/3-zero digital compensation internally, eliminating the need for external op-amps, capacitors, or resistors. The compensator coefficients are stored in on-chip flash and can be tuned in real time via PMBus without interrupting regulation - a key advantage over analog controllers requiring physical component changes.
How does the UCD9248PFC handle overcurrent protection?
The UCD9248PFC provides dual-path overcurrent protection: (1) hardware-based analog comparators on CS-1A–CS-4A pins respond within 4 clock cycles (~15–40 µs) to disable DPWM outputs, and (2) digitized current measurements feed software-configurable fault thresholds with 200 µs monitoring intervals. Both paths operate concurrently for fail-safe coverage.
What package type and pin count does the UCD9248PFC use?
The UCD9248PFC uses an 80-pin Thin Quad Flat Package (TQFP) with exposed thermal pad, designated "PFC" in TI's ordering nomenclature. This package supports high-density PCB layouts and efficient heat dissipation in multi-phase power modules, and is compatible with standard reflow soldering processes.
Can the UCD9248PFC operate without an external 3.3 V supply?
Yes - the UCD9248PFC includes an internal shunt regulator controller that generates its own 3.3 V supply from the main input voltage (e.g., 12 V) using an external NPN transistor (e.g., FCX491A) and feedback resistor on the V33FB pin. Alternatively, external 3.3 V supplies may be applied directly to V33D, V33A, and V33DIO pins for simplified system integration.
UCD9248PFC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Fusion Digital Power™
- Package/Case:
- 80-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Special Purpose
- Current - Supply:
- -
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-TQFP (12x12)
UCD9248PFC FAQ
1.How can I place an order for UCD9248PFC through Aetrix?
Please submit a Request for Quotation (RFQ) for UCD9248PFC 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 UCD9248PFC reliable?
The price and inventory of UCD9248PFC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCD9248PFC is usually 5 days.
3.What payment methods are accepted for UCD9248PFC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCD9248PFC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCD9248PFC?
UCD9248PFC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCD9248PFC 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 UCD9248PFC?
For technical support, including UCD9248PFC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCD9248PFC requirements.
6.How does Aetrix verify that UCD9248PFC is sourced from the original manufacturer or authorized distributors?
All UCD9248PFC 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 UCD9248PFC meets industry standards.
7.What is the process for return or replacement of UCD9248PFC?
All UCD9248PFC units undergo pre-shipment inspection (PSI). If there is an issue with UCD9248PFC, 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 UCD9248PFC part is unused and in its original packaging.
Return procedure for UCD9248PFC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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