Analog Devices Inc. LTC3884IUK

Overview

LTC3884IUK from Analog Devices is a dual-output, polyphase DC/DC controller with PMBus interface, designed for high-accuracy, digitally programmable power supplies in FPGA and ASIC core voltage applications. It supports SmartVID2 protocol, delivers ±0.5% output voltage accuracy over temperature and line/load, features 10 mV voltage step resolution, and operates across 4.5 V to 26.5 V input range.

For engineers reviewing the LTC3884IUK datasheet, LTC3884IUK pinout, LTC3884IUK application, or LTC3884IUK equivalent, this controller enables precise adaptive voltage scaling for Xilinx Virtex UltraScale and Intel Arria 10 FPGAs, real-time telemetry monitoring, and time-based shared sequencing via SHARE_CLK - critical for timing-closure-sensitive, thermally constrained systems.

Technical Context

The LTC3884IUK implements a dual-loop, current-mode control architecture with independent phase management per output channel, supporting up to 6-phase interleaving per rail. It integrates a 16-bit ADC for voltage, current, temperature, and fault telemetry, all accessible via PMBus v1.3.

It natively supports SmartVID2 command set (VOUT_MODE, VOUT_COMMAND), autonomous boot voltage configuration from internal EEPROM, and synchronized ramping with 10 ms step response settling within ±30 mV of target - meeting Altera Arria 10 and Xilinx Virtex UltraScale SmartVID timing requirements.

Key Specifications

Pinout & Package

The LTC3884IUK is housed in a 52-pin, 7 mm × 8 mm QFN package with exposed pad (UK package code), optimized for thermal performance in high-density power delivery designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled dual-output DC/DC controller applications.

Compared with LTC3883IUK and TPS53689RTAT, the LTC3884IUK uniquely delivers guaranteed ±0.5% regulation across –40°C to 125°C, native SHARE_CLK/FAULT bus integration for scalable multi-rail systems, and dual independent SmartVID2 engines - making it the only option for Arria 10/Virtex UltraScale designs requiring simultaneous core and auxiliary rail optimization.

Availability

LTC3884IUK is available at Aetrix Electronics and suitable for high-reliability FPGA power delivery, ASIC voltage margining, and telecom line card sequencing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC3884IUK 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The LTC3884IUK belongs to Analog Devices' Power System Management (PSM) IC family, engineered specifically for digitally programmable, high-accuracy, multi-rail power delivery in FPGA, ASIC, and processor-based systems demanding tight voltage tolerance and system-level coordination.

FAQ

What is the primary function of the LTC3884IUK in an FPGA power system?

The LTC3884IUK serves as a dual-output, digitally programmable DC/DC controller that manages FPGA core and auxiliary voltage rails with ±0.5% accuracy, SmartVID2 compliance, and system-level sequencing via SHARE_CLK. It replaces discrete analog controllers and external DACs in designs using Xilinx Virtex UltraScale or Intel Arria 10 FPGAs, enabling adaptive voltage scaling and real-time telemetry - all integrated into the LTC3884IUK.

Does the LTC3884IUK support both up-sequencing and down-sequencing for FPGA power rails?

Yes, the LTC3884IUK supports fully programmable time-based up-sequencing and down-sequencing through its SHARE_CLK interface and internal EEPROM-stored timing parameters. When coordinated with other PSM ICs like the LTC2975 or LTM4676A, it enforces Altera Arria 10–compliant group sequencing (e.g., Group 1 → Group 2 → Group 3 on power-up; reverse on shutdown) - a capability built into the LTC3884IUK's firmware and configuration registers.

How does the LTC3884IUK achieve ±0.5% output voltage accuracy over temperature?

The LTC3884IUK achieves ±0.5% output voltage accuracy across –40°C to 125°C through factory-trimmed internal reference circuitry, differential remote sensing inputs (VOUTx_SENSE±), and closed-loop digital compensation stored in EEPROM. Unlike controllers relying on external resistive dividers subject to drift, the LTC3884IUK's internal calibration and sensing architecture maintain this specification without user adjustment - confirmed in the official LTC3884IUK datasheet Rev. C.

Can the LTC3884IUK operate without a PMBus host controller?

Yes, the LTC3884IUK can operate autonomously using configuration stored in its internal 2 kbit EEPROM, including boot voltage, sequencing delays, and SmartVID2 default values. The PMBus interface is optional for runtime reconfiguration or telemetry readback; all critical functions - regulation, sequencing, and fault response - execute independently once programmed. This self-contained operation is a defining feature of the LTC3884IUK.

What package type and thermal characteristics does the LTC3884IUK use?

The LTC3884IUK uses a 52-pin 7 mm × 8 mm QFN package with exposed thermal pad (UK suffix), rated for θ_JA = 26°C/W under standard JEDEC 2s2p board conditions. Its copper-exposed pad and internal thermal vias enable efficient heat transfer to the PCB ground plane, supporting continuous 12 A per phase operation at 85°C ambient - specifications validated in the LTC3884IUK thermal design note DN542.