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

Texas Instruments UCC3882DWTR-1

Name: UCC3882DWTR-1
Brand: Texas Instruments
SKU: UCC3882DWTR-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC3882DWTR-1

Manufacturer:: Texas Instruments

Category:: Special Purpose Regulators

Package:: 28-SOIC (0.295", 7.50mm Width)

Datasheet:: UCC3882DWTR-1.pdf

Description:: IC REG CTRLR INTEL 1OUT 28SOIC

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Product details

Overview

UCC3882DWTR-1 from Texas Instruments is a 28-pin SOIC wide-body 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 UCC3882DWTR-1 datasheet, UCC3882DWTR-1 pinout, UCC3882DWTR-1 application, or UCC3882DWTR-1 equivalent, key selection criteria include VID-code compatibility with Intel Pentium® II VRM 8.1, synchronous gate drive timing control via RT/CT, dual overvoltage/undervoltage fault windows (±9% and +17.5%), and integrated current sense amplifier with 16× gain.

Technical Context

The UCC3882DWTR-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 dual comparator architecture monitors VSNS against COMMAND with two independent thresholds: ±9% for PWRGD assertion and +17.5% for forced GATEHI shutdown/GATELO activation.

Oscillator frequency is set externally via RT and CT pins, enabling precise tuning from 100 kHz to 700 kHz; dead-time between GATEHI and GATELO is also RT-programmable to prevent cross-conduction. The -1 suffix denotes full DAC-code enablement - unlike the base UCC3882, all D0–D4 codes activate gate drives and regulate at the corresponding COMMAND voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
DAC Output Range	1.3 V–2.05 V (50 mV steps), 2.1 V–3.5 V (100 mV steps); directly compatible with Intel VRM 8.1 VID codes
DAC + Reference Accuracy	±1% total error; ensures tight DC output regulation without external trimming
Oscillator Frequency Range	100 kHz–700 kHz; set by RT (10 kΩ–50 kΩ) and CT (1000 pF–5600 pF)
Overvoltage Protection	+9% trip (PWRGD active), +17.5% trip (GATEHI disabled, GATELO forced on)
Undervoltage Lockout	Turn-on at 10.5 V, turn-off at 9.5 V; 500 mV hysteresis prevents chatter during brownout
Current Sense Gain	16×; enables use of low-value (e.g., 5 mΩ) sense resistors to minimize conduction loss
Foldback Current Limit	Clamps short-circuit current to ~50% nominal (e.g., 17 A → 8.5 A) when VOUT drops below 50% of COMMAND

Pinout & Package

UCC3882DWTR-1 is housed in a 28-pin SOIC wide-body (DW) package, 0.300-inch body width, with gull-wing leads and standard JEDEC MS-013AC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5	D0–D4 digital inputs	5-bit VID code interface; floating = logic high (1), grounded = logic low (0); internal 5 V pull-ups
6	EN	Active-low enable; pulling low disables GATEHI/GATELO; internally pulled up to 5 V
7	GND	Analog ground reference for internal amplifiers and comparators
8	VFB	Inverting input of voltage error amplifier; connected to output feedback divider
9	COMP	Voltage error amplifier output; connects to compensation network between COMP and VFB
10	VDRVLO	Power supply for low-side gate driver (GATELO); typically 5 V or 12 V
11	GATELO	Low-impedance totem-pole driver for synchronous rectifier MOSFET; 2 Ω typical R_DS(on)
12	PGND	Power ground for gate drivers; must be short-traced to GND externally
13	RT	Oscillator timing and dead-time programming; sets frequency and GATEHI/GATELO transition delay
14	CT	Oscillator timing capacitor connection; used with RT to define switching frequency
15	VIN	Main IC supply; requires ≥10.8 V; UVLO activates below 9.5 V
16	VDRVHI	Power supply for high-side gate driver (GATEHI); typically 12 V (5 V input) or 18 V (12 V input)
17	GATEHI	Low-impedance totem-pole driver for high-side MOSFET; 2 Ω typical R_DS(on)
18	IS−	Inverting input of current sense amplifier; connects to low side of sense resistor
19	IS+	Non-inverting input of current sense amplifier; connects to high side of sense resistor
20	ISOUT	Current sense amplifier output; = COMMAND + 16 × V_sense; feeds CAO for current loop
21	CAM	Inverting input of current amplifier; receives ISOUT and connects to CAO compensation network
22	CAO	Current amplifier output; drives PWM comparator; clamped at 3 V for fast transient response
23	VSNS	Output voltage monitoring input; feeds OV/UV comparators and foldback circuitry
24	PWRGD	Open-drain power-good signal; sinks ≤1 mA when VSNS deviates >±9% from COMMAND
25	NC	No internal connection; must remain unconnected
26	COMMAND	DAC output and non-inverting input of voltage error amplifier; sets target output voltage
27	VREF	5 V precision reference; powers DAC and UVLO; bypass with 0.01 µF low-ESR capacitor
28	OSOUT	Oscillator output; not user-accessible in normal operation; internal node for frequency calibration

Key Features

Feature	Design Value
5-bit VID-compatible DAC	Directly programs 1.3 V–3.5 V output in Intel-standard steps; eliminates external DAC and reference
Average current mode control	Uses IS+/IS− and CAM/CAO for cycle-by-cycle current limiting and improved load transient response
Programmable synchronous dead time	RT-adjustable delay between GATEHI turn-off and GATELO turn-on prevents shoot-through in high-efficiency buck stages
Dual OV/UV fault detection	Independent ±9% window for PWRGD reset and +17.5% hard-shutdown ensure robust microprocessor protection
Foldback current limiting	Reduces short-circuit current to 50% of nominal when VOUT falls below 50% of COMMAND, minimizing MOSFET stress
-1 variant full-code enablement	All 32 VID codes activate GATEHI/GATELO and regulate at corresponding COMMAND voltage - no disable states

Applications

Pentium® II VRM Power Supply	VRM 8.1 Compliant CPU Core Supply
Use Scenario: Regulating 1.8 V–2.8 V core voltage for Intel Pentium® II processors under dynamic load conditions up to 15 A. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing VID-code decoding, average current sensing, and dual-MOSFET gate timing. Use Value: Enables compliance with Intel VRM 8.1 regulation specs (±1% DC accuracy, <1% load regulation) using only one IC and minimal external components.	Use Scenario: Providing tightly regulated, fast-transient core power for desktop/server CPUs requiring programmable output voltage via SMBus or hardwired VID pins. IC Role / Device Role / Timing Role: Voltage regulator controller implementing both voltage and current feedback loops with integrated 5-bit DAC and fault management. Use Value: Eliminates need for external DAC, reference, and discrete comparators - reduces BOM count and layout area while maintaining 1% system accuracy.
High-Efficiency Synchronous Buck Converter	Multi-Output VRM with Power-Good Signaling
Use Scenario: Converting 5 V or 12 V input to adjustable 1.3 V–3.5 V output in space-constrained embedded systems with thermal constraints. IC Role / Device Role / Timing Role: Dual-gate driver controller with programmable oscillator and dead time, supporting high-frequency (>400 kHz) operation for compact magnetics. Use Value: Achieves >90% efficiency at 15 A via synchronous rectification and low-R_DS(on) gate drivers, with foldback limiting preventing thermal runaway during faults.	Use Scenario: Powering multi-rail processor platforms where coordinated power sequencing and fault signaling are required across multiple voltage domains. IC Role / Device Role / Timing Role: Provides PWRGD open-drain output synchronized to VSNS monitoring, enabling system-level reset coordination with other VRMs. Use Value: Delivers deterministic power-good assertion within 10 µs of VSNS settling within ±9%, ensuring reliable CPU boot and safe shutdown sequences.

Pentium® II VRM Power Supply

VRM 8.1 Compliant CPU Core Supply

Use Scenario: Regulating 1.8 V–2.8 V core voltage for Intel Pentium® II processors under dynamic load conditions up to 15 A.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing VID-code decoding, average current sensing, and dual-MOSFET gate timing.

Use Value: Enables compliance with Intel VRM 8.1 regulation specs (±1% DC accuracy, <1% load regulation) using only one IC and minimal external components.

Use Scenario: Providing tightly regulated, fast-transient core power for desktop/server CPUs requiring programmable output voltage via SMBus or hardwired VID pins.

IC Role / Device Role / Timing Role: Voltage regulator controller implementing both voltage and current feedback loops with integrated 5-bit DAC and fault management.

Use Value: Eliminates need for external DAC, reference, and discrete comparators - reduces BOM count and layout area while maintaining 1% system accuracy.

High-Efficiency Synchronous Buck Converter

Multi-Output VRM with Power-Good Signaling

Use Scenario: Converting 5 V or 12 V input to adjustable 1.3 V–3.5 V output in space-constrained embedded systems with thermal constraints.

IC Role / Device Role / Timing Role: Dual-gate driver controller with programmable oscillator and dead time, supporting high-frequency (>400 kHz) operation for compact magnetics.

Use Value: Achieves >90% efficiency at 15 A via synchronous rectification and low-R_DS(on) gate drivers, with foldback limiting preventing thermal runaway during faults.

Use Scenario: Powering multi-rail processor platforms where coordinated power sequencing and fault signaling are required across multiple voltage domains.

IC Role / Device Role / Timing Role: Provides PWRGD open-drain output synchronized to VSNS monitoring, enabling system-level reset coordination with other VRMs.

Use Value: Delivers deterministic power-good assertion within 10 µs of VSNS settling within ±9%, ensuring reliable CPU boot and safe shutdown sequences.

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	Lacks -1 suffix; disables GATEHI/GATELO for DAC codes 1.3 V–1.75 V and all-D0–D4-high state (no-processor condition)	Used where automatic shutdown on invalid VID codes is required; incompatible with full-range programmability	Select UCC3882DWTR-1 if all 32 VID codes must regulate; choose UCC3882DWTR only if intentional disable behavior is needed.
TPS51116PWR	Single-chip VRM solution with integrated MOSFET drivers, 6-bit DAC, and SMBus interface; no external RT/CT required	Targets newer Intel mobile VRMs (e.g., Core Duo); lacks analog VID pin compatibility and discrete gate drive flexibility	UCC3882DWTR-1 offers greater design flexibility for discrete MOSFET selection and legacy VID support; TPS51116 suits space-constrained SMBus-based designs.

Compared with UCC3882DWTR and TPS51116PWR, the UCC3882DWTR-1 uniquely provides full 32-code VID enablement with analog control, discrete gate drive strength tuning, and external oscillator programming - making it optimal for cost-sensitive, thermally demanding, or legacy-compatible VRM implementations.

Availability

UCC3882DWTR-1 is available at Aetrix Electronics and suitable for Pentium® II VRM power supplies, VRM 8.1-compliant CPU core regulators, and high-efficiency synchronous buck converters requiring stable component supply and long-term industrial availability.

Supply support for UCC3882DWTR-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 ICs, with decades of expertise in power conversion and microprocessor VRM solutions.

The UCC3882DWTR-1 belongs to TI's legacy Unitrode VRM controller product line, engineered specifically for high-accuracy, high-current core voltage regulation in Intel-compatible desktop and server platforms.

FAQ

What is the function of the RT and CT pins on the UCC3882DWTR-1?

The RT and CT pins program the internal oscillator frequency and synchronous gate driver dead time on the UCC3882DWTR-1. RT (resistor) and CT (capacitor) together set the switching frequency from 100 kHz to 700 kHz per TI's published curves; RT alone adjusts the delay between GATEHI turn-off and GATELO turn-on to prevent cross-conduction. For UCC3882DWTR-1, RT values between 10 kΩ and 15 kΩ are recommended for optimal efficiency.

How does the UCC3882DWTR-1 differ from the standard UCC3882DWTR?

The UCC3882DWTR-1 differs from UCC3882DWTR in its DAC-code enable behavior: the -1 variant enables GATEHI and GATELO for all 32 VID codes (1.3 V–3.5 V), whereas the base UCC3882DWTR disables outputs for codes 1.3 V–1.75 V and when all D0–D4 pins are high. This makes UCC3882DWTR-1 suitable for full-range programmability without unintended shutdowns.

What is the purpose of the foldback current limit in the UCC3882DWTR-1?

The foldback current limit in the UCC3882DWTR-1 reduces the short-circuit current limit to approximately 50% of its nominal value (e.g., 17 A → 8.5 A) when the output voltage falls below 50% of the COMMAND voltage. This protects external MOSFETs and capacitors from excessive stress and thermal damage during sustained output faults, improving system reliability without requiring external circuitry.

Can the UCC3882DWTR-1 operate from a 5 V input supply?

No - the UCC3882DWTR-1 requires a minimum VIN of 10.5 V to exit undervoltage lockout; its specified operating range is 10.8 V to 15 V. However, it can regulate a 5 V input down to 1.3 V–3.5 V output: VDRVHI should be supplied from 12 V (not VIN), and VDRVLO may be 5 V or 12 V depending on the synchronous MOSFET gate threshold. The IC itself must be powered from ≥10.8 V.

What is the role of the VSNS pin in the UCC3882DWTR-1?

The VSNS pin on the UCC3882DWTR-1 monitors the regulated output voltage through an RC filter and serves three critical functions: (1) triggers PWRGD assertion when deviation exceeds ±9% of COMMAND, (2) initiates hard shutdown (+17.5% trip) by disabling GATEHI and enabling GATELO, and (3) enables foldback current limiting when VOUT drops below 50% of COMMAND. Proper filtering and layout are essential to avoid noise-induced false trips.

UCC3882DWTR-1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 28-SOIC (0.295", 7.50mm 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-SOIC

UCC3882DWTR-1 FAQ

1.How can I place an order for UCC3882DWTR-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC3882DWTR-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 UCC3882DWTR-1 reliable?

The price and inventory of UCC3882DWTR-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3882DWTR-1 is usually 5 days.

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UCC3882DWTR-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC3882DWTR-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 UCC3882DWTR-1?

For technical support, including UCC3882DWTR-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3882DWTR-1 requirements.

6.How does Aetrix verify that UCC3882DWTR-1 is sourced from the original manufacturer or authorized distributors?

All UCC3882DWTR-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 UCC3882DWTR-1 meets industry standards.

7.What is the process for return or replacement of UCC3882DWTR-1?

All UCC3882DWTR-1 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3882DWTR-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 UCC3882DWTR-1 part is unused and in its original packaging.

Return procedure for UCC3882DWTR-1:

1.Submit a request within 90 days.

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

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