Texas Instruments UCC3882DW-1

Overview

UCC3882DW-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 programmable output voltages from 1.3 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 UCC3882DW-1 datasheet, UCC3882DW-1 pinout, UCC3882DW-1 application, or UCC3882DW-1 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 UCC3882DW-1 implements average current mode control using a dedicated current sense amplifier (IS+/IS− → ISOUT) with 16× gain and 1.37 V foldback clamp referenced to COMMAND voltage. Its 5-bit DAC (D0–D4) directly supports Intel VID codes, generating a precision COMMAND voltage that serves as both the voltage error amplifier reference and the OVP/UV/VSNS comparator threshold baseline.

Internal oscillator frequency (300–420 kHz typical) is set by external RT/CT components; dead-time between GATEHI and GATELO transitions is programmable via RT alone. The device integrates separate power domains: VIN (10.5–15 V) powers logic and analog circuitry, while VDRVHI (≤18.5 V) and VDRVLO (≤15 V) independently supply high- and low-side gate drivers.

Key Specifications

Pinout & Package

UCC3882DW-1 is housed in a 28-pin SOIC wide-body (DW) surface-mount package (10.3 mm × 20.9 mm, 1.27 mm pitch). Pin functions are validated per TI SLUS294C Rev F (Feb 2010).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC3882DW and TPS51116PWR, the UCC3882DW-1 uniquely supports full-range Intel VID codes with guaranteed gate drive enablement, offers discrete oscillator tuning via RT/CT, and maintains legacy SOIC-28 layout compatibility-making it optimal for cost-sensitive, field-upgradable Pentium® II–era VRM designs.

Availability

UCC3882DW-1 is available at Aetrix Electronics and suitable for Intel VRM-compliant CPU core supplies, desktop motherboard power stages, and industrial embedded computing platforms requiring stable component supply and long-term lifecycle support.

Supply support for UCC3882DW-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 voltage regulation.

The UCC3882DW-1 belongs to TI's legacy Unitrode VRM controller product line, engineered specifically for high-accuracy, synchronous buck regulation in Intel Pentium® II–class computing platforms.

FAQ

What is the key functional difference between UCC3882DW-1 and UCC3882DW?

The UCC3882DW-1 guarantees continuous GATEHI and GATELO operation across the full 5-bit DAC range (1.3 V–3.5 V), including all VID codes. In contrast, the standard UCC3882DW disables gate outputs for DAC codes 1.3–1.75 V and when all D4–D0 pins are high-making UCC3882DW-1 the only variant fully compliant with Intel VRM 8.1's unrestricted VID requirements. This behavior is explicitly defined in Table 1 of the UCC3882/-1 datasheet.

How does the UCC3882DW-1 implement foldback current limiting?

The UCC3882DW-1 implements foldback current limiting by clamping the COMP pin at 1.37 V above the COMMAND voltage when the output is shorted. As the output voltage collapses, the VSNS signal falls below COMMAND/2, triggering the foldback circuit to reduce the current limit to 50% of its nominal value-e.g., from 17 A to ~8.5 A-thereby protecting MOSFETs and output capacitors. This is confirmed in the "FOLDBACK CURRENT LIMIT" section of the Electrical Characteristics table.

What are the valid oscillator frequency ranges for UCC3882DW-1, and how is it set?

The UCC3882DW-1 supports oscillator frequencies from 100 kHz to 700 kHz, set externally using resistor RT (10 kΩ–50 kΩ) and capacitor CT. At TA = 25°C, typical frequency is 360 kHz; over 0°C–70°C, it ranges from 300 kHz to 420 kHz. Table 2 in the datasheet lists standard combinations (e.g., RT = 10 kΩ, CT = 3900 pF yields ~225 kHz). Frequency accuracy depends on component tolerance and layout.

Does UCC3882DW-1 require external components for voltage reference stability?

Yes-the UCC3882DW-1 requires a 0.01 µF low-ESR, low-ESL ceramic capacitor directly between VREF and GND to ensure stable 5 V reference operation and noise immunity. This is mandated in the PIN DESCRIPTIONS section for VREF and reinforced in the APPLICATION INFORMATION section, where improper bypassing risks UVLO misoperation and DAC inaccuracy.

How does the PWRGD output function in UCC3882DW-1, and what is its electrical specification?

The PWRGD output is an open-drain signal that pulls low when VSNS deviates more than ±9% from the COMMAND voltage-indicating out-of-regulation conditions. Its on-resistance is guaranteed ≤470 Ω, allowing direct connection to a 3.3 V or 5 V pull-up with ≤1 mA sink current. This reset signal is used to hold microprocessors in reset until stable core voltage is established, per Intel VRM specifications.