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Texas Instruments UCC3882PWTR/81484
- Part No.:
- UCC3882PWTR/81484
- Manufacturer:
- Texas Instruments
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC3882PWTR/81484.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,406
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Product details
Overview
UCC3882PWTR/81484 from Texas Instruments is an average current mode synchronous buck controller with integrated 5-bit DAC, designed for high-end microprocessor VRM applications. It delivers programmable output voltages from 1.8 V to 3.5 V in precise 50 mV/100 mV steps, features 1% DAC/reference combined accuracy, foldback current limiting, and dual totem-pole gate drivers (GATEHI/GATELO) supporting up to 700 kHz switching frequency.
For engineers reviewing the UCC3882PWTR/81484 datasheet, UCC3882PWTR/81484 pinout, UCC3882PWTR/81484 application, or UCC3882PWTR/81484 equivalent, this device is selected for Intel Pentium® II–class VRM designs requiring tight voltage regulation, synchronous rectification control, overvoltage/undervoltage fault monitoring, and programmable dead-time management via RT.
Technical Context
The UCC3882PWTR/81484 implements average current mode control using a dedicated current sense amplifier (IS+/IS− → ISOUT) with 16× gain and a current amplifier (CAM/CAO) that feeds the PWM comparator. Its 5-bit DAC (D0–D4) sets the COMMAND voltage - the non-inverting input of the voltage error amplifier - enabling direct VID-code compatibility per Intel VRM specifications.
Oscillator frequency is externally programmed via RT and CT pins (300–420 kHz typical), while UVLO (10.5 V turn-on / 9.5 V turn-off), OVP (+9% and +17.5% thresholds), and PWRGD open-drain reset signaling provide system-level power integrity. The GATEHI/GATELO drivers feature programmable dead time and 2-Ω totem-pole outputs capable of driving large external MOSFETs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 5-bit (32 codes), supporting Intel VID-compatible voltage programming |
| Output Voltage Range | 1.3 V–2.05 V @ 50 mV steps; 2.1 V–3.5 V @ 100 mV steps |
| DAC/Reference Accuracy | ±1% combined error - ensures system-level DC regulation compliance |
| Switching Frequency | 300–420 kHz (0°C to 70°C) - programmable via RT/CT for optimal efficiency vs. size trade-off |
| Current Sense Gain | 16 V/V - enables use of low-value (e.g., 5 mΩ), low-power-loss sense resistors |
| Foldback Current Limit | Clamps short-circuit current to ~50% nominal (e.g., 17 A → 8.5 A) - reduces MOSFET/capacitor stress |
| UVLO Thresholds | Turn-on: 10.5 V; Turn-off: 9.5 V; Hysteresis: 500 mV - prevents erratic startup/shutdown |
| GATE Driver Output | 2-Ω totem pole; VOH = 11.8 V @ 100 mA, VOL = 0.2 V @ –100 mA - drives logic- or standard-level MOSFETs |
Pinout & Package
UCC3882PWTR/81484 is housed in a 28-pin wide-body SOIC (PW) package, surface-mount, RoHS-compliant, with exposed thermal pad (not electrically connected). Pin 1 marked by beveled corner; top-side marking includes "UCC3882" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VSNS) | Output voltage sense input | Monitors regulated output via RC filter; triggers PWRGD reset at ±9% and OVP shutdown at +17.5% |
| 2 (PWRGD) | Open-drain power-good output | Sinks ≤1 mA when VSNS deviates >±9%; requires external pull-up to logic rail |
| 3 (NC) | No internal connection | Not bonded; must remain unconnected per TI design rules |
| 4 (CAM) | Current amplifier inverting input | Receives amplified current feedback from ISOUT; connects to compensation network with CAO |
| 5 (CAO) | Current amplifier output | Drives PWM comparator; clamped at 3 V to limit duty cycle during transients |
| 6 (OSOUT) | Oscillator output (test only) | Internal oscillator node - not intended for external connection or loading |
| 7 (IS+) | Current sense non-inverting input | Connects to high side of sense resistor; common-mode range: 0–4.5 V |
| 8 (IS−) | Current sense inverting input | Connects to low side of sense resistor; enables differential sensing of inductor current |
| 9 (VIN) | Main supply input | Powers internal circuitry; UVLO active below 9.5 V; max rating: 15 V |
| 10 (VDRVLO) | Low-side gate driver supply | Provides power to GATELO; typically 5 V or 12 V; bypass directly to PGND |
| 11 (GATELO) | Low-side MOSFET gate driver | Drives synchronous rectifier; disabled during UVLO or invalid VID codes |
| 12 (PGND) | Power ground return | Dedicated ground for GATEHI/GATELO drivers; must be short-traced to GND |
| 13 (RT) | Oscillator timing & dead-time control | Resistor sets frequency and cross-conduction delay; 10–50 kΩ recommended |
| 14 (CT) | Oscillator timing capacitor | Capacitor sets frequency with RT; low-ESR ceramic required for stability |
| 15 (GND) | Analog/substrate ground reference | Reference for all analog blocks except gate drivers; bypass VREF/VIN/COMMAND here |
| 16 (D0) | DAC LSB input | VID code bit; logic high = float or 5 V; logic low = GND; internal 5 V pull-up |
| 17 (D1) | DAC bit 1 | Part of 5-bit VID interface; supports Intel VRM 8.1 voltage selection |
| 18 (NC) | No internal connection | Not bonded; must remain unconnected |
| 19 (D2) | DAC bit 2 | Enables 32 discrete output voltages between 1.3 V and 3.5 V |
| 20 (D3) | DAC MSB (low range) | D3/D4 define voltage range: D4=0 → 1.3–2.05 V; D4=1 → 2.1–3.5 V |
| 21 (D4) | DAC MSB (range select) | Primary range selector; floating = high; determines 50 mV vs. 100 mV step resolution |
| 22 (VREF) | 5 V precision reference output | Stable 5 V source for DAC and UVLO; current-limited; bypass with 0.01 µF low-ESR cap |
| 23 (COMMAND) | DAC output & voltage error amp non-inv input | Directly sets target output voltage; impedance ~1.2 kΩ; bypass with 0.01 µF cap |
| 24 (VDRVHI) | High-side gate driver supply | Powers GATEHI; 12–18 V typical; bypass to PGND with ≥0.1 µF low-ESR capacitor |
| 25 (GATEHI) | High-side MOSFET gate driver | Drives upper switch; disabled during UVLO, OVP, or invalid VID (UCC3882 variant) |
| 26 (EN) | Enable/disable control | Pulled up internally; grounding disables both GATEHI and GATELO outputs |
| 27 (COMP) | Voltage error amplifier output | Connects to VFB via compensation network; clamped at COMMAND + 1.37 V for current limit |
| 28 (VFB) | Voltage error amplifier inverting input | Connects to output divider; closes voltage regulation loop with COMP and COMMAND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5-bit DAC with VID compatibility | Directly implements Intel VRM 8.1 voltage codes without external DAC or logic |
| Average current mode control architecture | Enables accurate load current monitoring and fast transient response via ISOUT/CAM/CAO path |
| Programmable foldback current limiting | Reduces short-circuit current to 50% nominal under output fault - minimizes thermal stress on MOSFETs and capacitors |
| Dual independent gate drivers with dead-time control | Eliminates cross-conduction risk via RT-programmed delay; supports high-efficiency synchronous buck topologies |
| Dual overvoltage protection windows | +9% OV trips PWRGD; +17.5% OVP forces GATEHI off/GATELO on - provides layered fault containment |
| Low-offset current sense amplifier | 1 mV input offset enables accurate sensing with <5 mΩ shunts - reduces conduction losses and board heat |
Applications
| Intel Pentium® II VRM | Desktop CPU Core Power Supply |
|---|---|
Use Scenario: Regulating core voltage for Pentium® II processors in desktop motherboards with VRM 8.1 compliance. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing VID-based voltage selection, current-mode loop, and power-good signaling. Use Value: Enables precise 1.8 V–2.8 V output with ±1% DAC accuracy and fast transient response required by Intel VRM 8.1 spec. |
Use Scenario: Providing dynamically adjustable core power to multi-core x86 CPUs in ATX form-factor systems. IC Role / Device Role / Timing Role: Central PWM controller coordinating high-side/low-side MOSFET timing, current sensing, and fault reporting. Use Value: Programmable dead time (via RT) and foldback current limit ensure robust operation across varying load profiles and thermal conditions. |
| Server Processor Power Delivery | High-Performance Embedded Computing |
Use Scenario: Delivering stable, tightly regulated power to server-class Xeon® processors in 1U rack-mounted platforms. IC Role / Device Role / Timing Role: Synchronous controller implementing average current mode for accurate load-line regulation and phase balancing. Use Value: Dual OVP thresholds (+9% and +17.5%) provide fail-safe shutdown before damage occurs during rail collapse or feedback failure. |
Use Scenario: Powering FPGA or ASIC cores in industrial embedded systems requiring programmable voltage and high reliability. IC Role / Device Role / Timing Role: Voltage-regulator controller interfacing with host processor via VID lines for dynamic voltage scaling (DVS). Use Value: 5-bit DAC allows 32 discrete output voltages; EN pin enables hardware-controlled power sequencing and graceful shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3882DWTR | Same functionality and pinout; packaged in SOIC-28 wide-body (DW) instead of PW; identical electrical specs | No functional difference; DW and PW packages share same thermal and electrical performance per TI documentation | Select UCC3882DWTR only if legacy board layout uses DW footprint; otherwise UCC3882PWTR/81484 is preferred for newer designs |
| TPS51200DRCR | Single-chip VRM controller with integrated MOSFET drivers and 3-A LDO; lacks 5-bit DAC but supports SMBus/PMBus interface | Designed for newer Intel VRM 11+ and AMD platforms; supports digital telemetry and adaptive voltage positioning | Choose TPS51200DRCR for digital control, telemetry, or space-constrained designs; UCC3882PWTR/81484 remains optimal for analog VID-based legacy systems |
Compared with UCC3882DWTR (mechanical variant) and TPS51200DRCR (digital successor), the UCC3882PWTR/81484 offers best-in-class analog VID compatibility, proven reliability in Pentium® II–era VRMs, and minimal external component count - making it ideal for cost-sensitive, high-volume motherboard production where analog control suffices.
Availability
UCC3882PWTR/81484 is available at Aetrix Electronics and suitable for Intel VRM-compliant CPU power supplies, desktop motherboard designs, and industrial embedded computing platforms requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCC3882PWTR/81484 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 ICs, with decades of expertise in power conversion and microprocessor voltage regulation.
The UCC3882PWTR/81484 belongs to TI's legacy Unitrode VRM controller product line, engineered specifically for high-accuracy, synchronous buck regulation in Intel Pentium® II–class CPU power delivery systems.
FAQ
What is the operating temperature range for the UCC3882PWTR/81484?
The UCC3882PWTR/81484 is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with standard desktop motherboard thermal environments and matches the datasheet's electrical characterization conditions. Operation outside this range may result in degraded DAC accuracy, oscillator drift, or reduced gate drive strength. For extended temperature applications, consult TI's automotive-grade alternatives or derating guidelines.
Does the UCC3882PWTR/81484 support both 5 V and 12 V input systems?
Yes, the UCC3882PWTR/81484 is explicitly designed for compatibility with both 5 V and 12 V input systems, as confirmed in its official features list. VIN accepts 10.8 V–15 V, while VDRVHI and VDRVLO can be independently set to 5 V or 12 V (or up to 18 V for VDRVHI) depending on MOSFET gate drive requirements. This flexibility enables use in diverse VRM architectures, including 5 V–to–core and 12 V–to–core conversions.
How does the foldback current limiting function in the UCC3882PWTR/81484?
The UCC3882PWTR/81484 implements foldback current limiting by reducing the short-circuit current limit to approximately 50% of its nominal value when the output voltage falls to half the COMMAND voltage. For example, with a 2.3 V COMMAND and 17 A nominal limit, foldback activates near 1.15 V output and lowers the limit to ~8.5 A. This behavior is implemented via internal circuitry monitoring VSNS and is documented in the Electrical Characteristics table under "FOLDBACK CURRENT LIMIT".
What is the purpose of the two overvoltage comparators in the UCC3882PWTR/81484?
The UCC3882PWTR/81484 includes two distinct overvoltage comparators: one triggers PWRGD assertion at +9% above COMMAND (for system reset), and the second forces GATEHI off and GATELO on at +17.5% above COMMAND (for immediate shutdown). This dual-threshold architecture provides layered protection - the first alerts the host processor, while the second acts autonomously to prevent catastrophic overvoltage damage, even if the host fails to respond.
Can the UCC3882PWTR/81484 be used with modern processors beyond Pentium® II?
The UCC3882PWTR/81484 was designed for Intel Pentium® II VRM 8.1 compliance and supports VID codes from 1.3 V to 3.5 V. While it can regulate voltages compatible with some later processors, it lacks support for newer protocols (e.g., SMBus, SVI2), adaptive voltage positioning (AVP), or multi-phase synchronization. For post-Pentium® II platforms, TI recommends successors like the TPS51200 or UCD92xx families - but UCC3882PWTR/81484 remains valid for legacy maintenance and retro-compatibility.
UCC3882PWTR/81484 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VID code
- Voltage - Input:
- 5V, 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.8V ~ 2.05V, 2.1V ~ 3.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
UCC3882PWTR/81484 FAQ
1.How can I place an order for UCC3882PWTR/81484 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3882PWTR/81484 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 UCC3882PWTR/81484 reliable?
The price and inventory of UCC3882PWTR/81484 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3882PWTR/81484 is usually 5 days.
3.What payment methods are accepted for UCC3882PWTR/81484?
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UCC3882PWTR/81484 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3882PWTR/81484 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 UCC3882PWTR/81484?
For technical support, including UCC3882PWTR/81484 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3882PWTR/81484 requirements.
6.How does Aetrix verify that UCC3882PWTR/81484 is sourced from the original manufacturer or authorized distributors?
All UCC3882PWTR/81484 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 UCC3882PWTR/81484 meets industry standards.
7.What is the process for return or replacement of UCC3882PWTR/81484?
All UCC3882PWTR/81484 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3882PWTR/81484, 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 UCC3882PWTR/81484 part is unused and in its original packaging.
Return procedure for UCC3882PWTR/81484:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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