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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Texas Instruments UCC3882PWTR-1

Name: UCC3882PWTR-1
Brand: Texas Instruments
SKU: UCC3882PWTR-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC3882PWTR-1

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: UCC3882PWTR-1.pdf

Description:: IC REG CTRLR INTEL 1OUT 28TSSOP

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Product details

Overview

UCC3882PWTR-1 from Texas Instruments is a 28-pin wide-body SOIC average current mode synchronous buck controller with integrated 5-bit DAC, designed for high-end microprocessor VRM applications. It delivers 1.3 V–3.5 V output in 50/100 mV steps, supports 12 V input, features 1% DAC/reference accuracy, foldback current limiting, and programmable oscillator up to 700 kHz.

For engineers reviewing the UCC3882PWTR-1 datasheet, UCC3882PWTR-1 pinout, UCC3882PWTR-1 application, or UCC3882PWTR-1 equivalent, key selection criteria include VID-code compatibility with Intel Pentium® II, synchronous gate drive timing control via RT/CT, dual overvoltage/undervoltage fault windows (±9%, +17.5%), and integrated current sense amplifier with 16× gain for low-R_sense operation.

Technical Context

The UCC3882PWTR-1 implements average current mode control using a dedicated current amplifier (CAM/CAO) and voltage error amplifier (VFB/COMP), with the COMMAND pin serving as both DAC output and voltage reference for both loops. Its 5-bit VID interface directly maps to Intel's VRM 8.1 specification, enabling precise output voltage programming across two ranges: 1.3–2.05 V (50 mV steps) and 2.1–3.5 V (100 mV steps).

Internal protection includes dual OV comparators - one triggering PWRGD at ±9% of COMMAND voltage, the other forcing GATELO high/GATEHI low at +17.5% - plus UVLO (10.5 V turn-on, 10 V turn-off), foldback current limit clamping at 1.37 V above COMMAND, and programmable dead time via RT to prevent cross-conduction between external high-side and synchronous low-side MOSFETs.

Key Specifications

Parameter	Value and Actual Design Meaning
DAC Output Range	1.3 V–2.05 V in 50 mV steps; 2.1 V–3.5 V in 100 mV steps - matches Intel VRM 8.1 VID codes for Pentium® II
Oscillator Frequency	300–420 kHz (0°C to 70°C) - set by RT/CT; supports up to 700 kHz with external component selection
Current Sense Gain	16× - enables use of ≤5 mΩ sense resistor while maintaining accurate average current feedback
Overvoltage Protection	+9% and +17.5% of COMMAND voltage - dual thresholds for PWRGD assertion and hard shutdown
Undervoltage Lockout	10.5 V turn-on / 10 V turn-off - ensures stable startup and shutdown sequencing for 12 V input systems
Foldback Current Limit	Clamps at 1.37 V above COMMAND - reduces short-circuit current to ~50% nominal to protect MOSFETs and capacitors
GATE Driver Outputs	2 Ω totem-pole drivers - capable of sourcing/sinking ≥100 mA for direct drive of large external MOSFETs

Pinout & Package

UCC3882PWTR-1 is housed in a 28-pin wide-body SOIC (PW) package with 0.600-inch body width and 1.27 mm pitch. Pin 1 is located at the bottom-left corner when viewed from top with marking dot oriented upper-left.

Pin/Terminal	Circuit Role	Design Meaning
1	VSNS	Output voltage sense input - monitors regulated output via RC filter; triggers PWRGD and OVP comparators
2	PWRGD	Open-drain power-good signal - pulled low if VSNS deviates >±9% from COMMAND voltage
3	NC	No internal connection - must be left unconnected
4	CAM	Inverting input of current amplifier - receives feedback from ISOUT through compensation network
5	CAO	Current amplifier output - drives PWM comparator; clamped at 3 V for transient response
6	ISOUT	Current sense amplifier output - equals (V_IS+−V_IS−)×16 + COMMAND; used for current loop control
7	IS+	Non-inverting input of current sense amplifier - connects to high side of sense resistor
8	IS−	Inverting input of current sense amplifier - connects to low side of sense resistor
9	VIN	Main supply input - powers internal circuitry; requires ≥10.8 V with bypass capacitor to GND
10	VDRVLO	Low-side gate driver supply - powers GATELO; typically 12 V for standard MOSFETs or 5 V for logic-level devices
11	GATELO	Low-side synchronous MOSFET driver - totem-pole output with programmable dead time via RT
12	PGND	Power ground - dedicated return for gate drivers; must be short-traced to GND
13	RT	Oscillator timing and dead-time control - sets frequency with CT and adjusts delay between GATEHI/GATELO transitions
14	CT	Oscillator timing capacitor input - works with RT to define switching frequency and ramp slope
15	GND	Analog ground reference - common return for all analog circuitry except gate drivers
16	D0	LSB of 5-bit VID code - logic low = 0, floating/high = 1; defines DAC output voltage step
17	D1	Bit 1 of VID code - internal 5 V pull-up; compatible with open-collector VID bus
18	NC	No internal connection - must be left unconnected
19	D2	Bit 2 of VID code - determines DAC range (D4) and resolution within selected range
20	D3	MSB of lower 4-bit group - part of 5-bit digital command defining COMMAND voltage
21	D4	Range select bit - selects 1.3–2.05 V (D4=0) or 2.1–3.5 V (D4=1) DAC output range
22	VREF	5 V precision reference - powers DAC and UVLO comparator; requires 0.01 µF low-ESR bypass
23	COMMAND	DAC output and voltage error amplifier non-inverting input - sets target output voltage
24	VDRVHI	High-side gate driver supply - powers GATEHI; 18 V max, typically 12 V or 18 V depending on input rail
25	GATEHI	High-side MOSFET driver - totem-pole output disabled during UVLO/OVP or invalid VID codes
26	EN	Enable/disable control - pulling low disables both GATEHI and GATELO outputs
27	COMP	Voltage error amplifier output - connects to VFB through compensation network; clamped at 1.37 V above COMMAND
28	VFB	Inverting input of voltage error amplifier - connects to output divider; closes voltage regulation loop

Key Features

Feature	Design Value
5-bit VID-compatible DAC	Directly implements Intel VRM 8.1 voltage programming with 1% combined DAC/reference accuracy
Average current mode control	Uses dedicated CAM/CAO amplifier pair for precise load-current regulation and fast transient response
Programmable synchronous dead time	RT pin controls delay between GATEHI turn-off and GATELO turn-on to eliminate cross-conduction
Dual overvoltage protection	Separate comparators trigger PWRGD at +9% and force shutdown at +17.5% of COMMAND voltage
Foldback current limiting	Reduces short-circuit current limit to ~50% of nominal value when output falls below 50% of COMMAND
Integrated 5 V reference	VREF pin provides stable, current-limited 5 V source for DAC and system monitoring functions

Applications

Pentium® II VRM Power Supply	VRM 8.1 Compliant Server PSU
Use Scenario: Powers Intel Pentium® II microprocessors requiring tightly regulated 1.8 V–2.8 V output with dynamic VID adjustment. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing voltage regulation, current sensing, and gate timing for high-efficiency CPU core supply. Use Value: Enables compliance with Intel VRM 8.1 specifications including ±9% PWRGD window, 5-bit VID interface, and 15 A rated output with 17 A short-circuit capability.	Use Scenario: Delivers multi-phase or single-phase regulated DC output for server motherboard CPU power domains. IC Role / Device Role / Timing Role: Central voltage-mode controller coordinating synchronous rectification, current monitoring, and fault signaling across distributed power rails. Use Value: Provides dual OV/UV fault detection, foldback current limiting, and programmable oscillator for optimized efficiency across varying load conditions and thermal profiles.
Embedded x86 Processor PSU	Industrial High-Performance DC-DC Module
Use Scenario: Supplies regulated power to embedded x86 processors such as VIA C3 or AMD Geode in industrial control systems. IC Role / Device Role / Timing Role: Standalone synchronous buck controller implementing average current mode for robust load-step response and stability. Use Value: Supports wide input range (12 V systems), offers 1.3 V–3.5 V programmability, and integrates protection features eliminating need for external supervisors.	Use Scenario: Serves as core controller in compact, high-density DC-DC modules targeting telecom and test equipment. IC Role / Device Role / Timing Role: Precision voltage regulator IC with integrated DAC, current sense, and gate drivers - minimizing external component count. Use Value: Reduces BOM count by integrating reference, comparators, amplifiers, and drivers; supports up to 700 kHz switching for smaller magnetics and faster transient response.

Pentium® II VRM Power Supply

VRM 8.1 Compliant Server PSU

Use Scenario: Powers Intel Pentium® II microprocessors requiring tightly regulated 1.8 V–2.8 V output with dynamic VID adjustment.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing voltage regulation, current sensing, and gate timing for high-efficiency CPU core supply.

Use Value: Enables compliance with Intel VRM 8.1 specifications including ±9% PWRGD window, 5-bit VID interface, and 15 A rated output with 17 A short-circuit capability.

Use Scenario: Delivers multi-phase or single-phase regulated DC output for server motherboard CPU power domains.

IC Role / Device Role / Timing Role: Central voltage-mode controller coordinating synchronous rectification, current monitoring, and fault signaling across distributed power rails.

Use Value: Provides dual OV/UV fault detection, foldback current limiting, and programmable oscillator for optimized efficiency across varying load conditions and thermal profiles.

Embedded x86 Processor PSU

Industrial High-Performance DC-DC Module

Use Scenario: Supplies regulated power to embedded x86 processors such as VIA C3 or AMD Geode in industrial control systems.

IC Role / Device Role / Timing Role: Standalone synchronous buck controller implementing average current mode for robust load-step response and stability.

Use Value: Supports wide input range (12 V systems), offers 1.3 V–3.5 V programmability, and integrates protection features eliminating need for external supervisors.

Use Scenario: Serves as core controller in compact, high-density DC-DC modules targeting telecom and test equipment.

IC Role / Device Role / Timing Role: Precision voltage regulator IC with integrated DAC, current sense, and gate drivers - minimizing external component count.

Use Value: Reduces BOM count by integrating reference, comparators, amplifiers, and drivers; supports up to 700 kHz switching for smaller magnetics and faster transient response.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC3882PWTR	Lacks -1 suffix; disables GATEHI/GATELO for VID codes 1.3–1.75 V and all-Dx-high states	Not suitable for systems requiring continuous operation across full 1.3–3.5 V DAC range	Select UCC3882PWTR-1 when full VID code coverage and guaranteed gate drive enablement are required
TPS51116PWR	Single-chip VRM solution with integrated MOSFET drivers, LDO, and telemetry; no external DAC needed	Targets newer Intel mobile platforms (Core Duo); lacks discrete current sense amplifier flexibility	Choose TPS51116PWR for space-constrained designs needing integrated power stage and telemetry, not discrete control

Compared with UCC3882PWTR and TPS51116PWR, the UCC3882PWTR-1 uniquely guarantees gate drive activation across the entire 1.3–3.5 V DAC range while retaining full external current sense amplifier configurability - making it optimal for legacy VRM 8.1 designs requiring field-programmable voltage and robust discrete current monitoring.

Availability

UCC3882PWTR-1 is available at Aetrix Electronics and suitable for Pentium® II VRM power supplies, server CPU voltage regulators, and industrial embedded x86 processor power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UCC3882PWTR-1 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 high-performance power conversion ICs.

The UCC3882PWTR-1 belongs to TI's legacy VRM controller product line, engineered specifically for Intel-compatible microprocessor voltage regulation modules requiring precise VID decoding, average current mode control, and synchronous rectification timing.

FAQ

What is the primary function of the UCC3882PWTR-1 in a power supply design?

The UCC3882PWTR-1 serves as an average current mode synchronous buck controller with integrated 5-bit DAC, primarily used to regulate output voltage for Intel Pentium® II and compatible microprocessors. It interprets VID codes to set the COMMAND voltage, manages current sensing via IS+/IS− inputs, drives external high-side and synchronous low-side MOSFETs through GATEHI/GATELO, and provides comprehensive fault protection including PWRGD, OV, UV, and foldback current limiting - all within a single 28-pin SOIC package.

How does the UCC3882PWTR-1 differ from the standard UCC3882PWTR variant?

The UCC3882PWTR-1 guarantees that GATEHI and GATELO outputs remain active for all 5-bit VID codes (1.3 V–3.5 V), whereas the standard UCC3882PWTR disables both gate drivers when the COMMAND voltage is programmed between 1.3 V and 1.75 V or when all D0–D4 pins are logic high. This makes the UCC3882PWTR-1 essential for applications requiring uninterrupted operation across the full DAC range, such as VRM 8.1-compliant systems where low-voltage VID codes indicate valid operating states.

What are the key timing-related pins on the UCC3882PWTR-1 and how are they used?

The UCC3882PWTR-1 uses RT and CT pins to program oscillator frequency and gate drive dead time. RT sets both the oscillator ramp rate and the delay between GATEHI turn-off and GATELO turn-on to prevent cross-conduction; CT works with RT to define frequency via an external capacitor. Typical values are RT = 10–15 kΩ and CT = 1–5.6 nF, supporting frequencies from 300 kHz to 700 kHz. The device also features built-in turn-on delays (135 ns GATELO→GATEHI, 150 ns GATEHI→GATELO) controlled by RT.

Does the UCC3882PWTR-1 support both 5 V and 12 V input systems?

Yes, the UCC3882PWTR-1 is explicitly designed for compatibility with both 5 V and 12 V input systems, as stated in its datasheet features. VIN requires ≥10.8 V for proper operation, so it is typically powered from a 12 V rail. VDRVHI and VDRVLO can be independently configured: VDRVHI is commonly tied to 12 V or 18 V depending on high-side MOSFET gate requirements, while VDRVLO may use 5 V for logic-level synchronous MOSFETs or 12 V for standard devices - enabling flexible adaptation to either input architecture.

What protection features does the UCC3882PWTR-1 provide beyond basic overvoltage and undervoltage detection?

Beyond ±9% PWRGD-triggering OV/UV detection on VSNS, the UCC3882PWTR-1 includes a second +17.5% OV comparator that forces GATEHI off and GATELO on for immediate shutdown, an undervoltage lockout (UVLO) with 10.5 V turn-on/10 V turn-off hysteresis, foldback current limiting that reduces short-circuit current to ~50% of nominal value when output drops below 50% of COMMAND, and internal clamping of COMP (1.37 V above COMMAND) and CAO (3 V) to prevent saturation during faults - collectively ensuring robust system-level reliability.

UCC3882PWTR-1 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-1 FAQ

1.How can I place an order for UCC3882PWTR-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC3882PWTR-1 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-1 reliable?

The price and inventory of UCC3882PWTR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3882PWTR-1 is usually 5 days.

3.What payment methods are accepted for UCC3882PWTR-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3882PWTR-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC3882PWTR-1?

UCC3882PWTR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC3882PWTR-1 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-1?

For technical support, including UCC3882PWTR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3882PWTR-1 requirements.

6.How does Aetrix verify that UCC3882PWTR-1 is sourced from the original manufacturer or authorized distributors?

All UCC3882PWTR-1 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-1 meets industry standards.

7.What is the process for return or replacement of UCC3882PWTR-1?

All UCC3882PWTR-1 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3882PWTR-1, 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-1 part is unused and in its original packaging.

Return procedure for UCC3882PWTR-1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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