Texas Instruments UCC3882DW

Overview

UCC3882DW 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 mV/100 mV steps, supports 12 V or 5 V input systems, and features foldback current limiting, dual overvoltage/undervoltage protection, and programmable dead-time control for synchronous MOSFETs.

For engineers reviewing the UCC3882DW datasheet, UCC3882DW pinout, UCC3882DW application, or UCC3882DW equivalent, this page provides verified technical context, confirmed pin functions, real-world VRM design parameters, DAC voltage accuracy (±1%), oscillator frequency range (300–420 kHz), and validated alternative controllers for Pentium® II–class power delivery.

Technical Context

The UCC3882DW implements average current mode control using a dedicated current sense amplifier (gain = 16 V/V, CMRR = 60 dB) and a voltage error amplifier (90 dB open-loop gain, ±10 mV offset). Its 5-bit DAC generates the COMMAND reference (1.3 V–3.5 V) directly compatible with Intel VID codes, with combined DAC/reference accuracy better than ±1%.

It integrates dual gate drivers (GATEHI/GATELO) with 2-Ω totem-pole outputs, programmable dead time via RT resistor, and internal cross-conduction prevention logic. The device uses separate PGND and GND pins, supports external 12 V or 18 V gate drive supplies (VDRVHI/VDRVLO), and includes foldback current limiting triggered at VSNS ≤ 50% of COMMAND voltage.

Key Specifications

Pinout & Package

UCC3882DW is housed in a 28-pin SOIC (DW package), 300 mil wide body, surface-mount package compliant with JEDEC MS-013AC. Pin 1 is located at bottom-left corner when notch faces up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC3882D, the UCC3882DW offers wider SOIC packaging for improved thermal dissipation and solder joint reliability in high-power VRMs; compared with TPS51116, it provides full analog control loop access, external sense resistor flexibility, and higher current scalability beyond 20 A with discrete FETs.

Availability

UCC3882DW is available at Aetrix Electronics and suitable for Pentium® II VRM designs, high-current point-of-load converters, and industrial embedded power supplies requiring stable component supply, long-lifecycle support, and verified 0°C–70°C operation.

Supply support for UCC3882DW 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 UCC3882DW belongs to TI's Unitrode high-performance power controller family, engineered specifically for Intel-compatible voltage regulator modules demanding tight DC accuracy, fast transient response, and robust fault protection.

FAQ

What is the DAC output voltage accuracy of the UCC3882DW?

The UCC3882DW achieves better than ±1% combined accuracy across its entire DAC output range (1.3 V–3.5 V), including both reference voltage error and DAC linearity. This specification is measured under standard conditions (10.8 V < VIN < 13.2 V, IREF = 0 mA) and applies to all valid VID codes from 1.8 V to 3.5 V. The UCC3882DW maintains this accuracy without requiring external calibration or trimming components.

How does the UCC3882DW implement foldback current limiting?

The UCC3882DW activates foldback current limiting when the VSNS voltage falls to approximately 50% of the COMMAND voltage, indicating severe output overload or short circuit. At that point, the current limit threshold reduces to 50% of its nominal value-e.g., from 17 A to ~8.5 A-minimizing MOSFET and capacitor stress. This behavior is implemented via internal analog circuitry and does not require external components or configuration.

Can the UCC3882DW operate from a 5 V input rail?

Yes, the UCC3882DW supports 5 V input systems. Its VIN pin requires ≥10.8 V to exit UVLO, so a 5 V input must be stepped up (e.g., using a charge pump or auxiliary boost converter) to power VIN. However, VDRVHI and VDRVLO can accept 5 V directly-VDRVLO may be tied to 5 V to drive logic-level MOSFETs, while VDRVHI should be ≥12 V for adequate high-side gate drive margin. The UCC3882DW is explicitly rated for compatibility with both 5 V and 12 V input architectures.

What is the purpose of the NC pins on the UCC3882DW?

The UCC3882DW has two NC (no-connect) pins: Pin 3 and Pin 18. These pins have no internal bond wire or silicon connection and serve no electrical function. They must be left unconnected-neither tied to GND nor routed on the PCB-to avoid unintended coupling or mechanical stress. Their presence accommodates package standardization and die layout constraints, not functional expansion.

Does the UCC3882DW support both synchronous and asynchronous buck topologies?

The UCC3882DW is designed exclusively for synchronous buck operation, with dedicated GATEHI and GATELO outputs for high-side and low-side MOSFETs. It includes internal anti-cross-conduction logic, programmable dead time, and a current-sense amplifier optimized for average current mode control in synchronous rectified converters. It does not support asynchronous (diode-rectified) topologies, as it lacks a dedicated diode drive output or associated control logic.