Analog Devices Inc. LTC3884EUK

Overview

LTC3884EUK from Analog Devices is a dual-output, polyphase synchronous step-down DC/DC controller with integrated PMBus interface, precision voltage regulation (±0.5% over line/load/temp), and real-time telemetry. It supports SmartVID2-compliant FPGA core voltage optimization for Altera Arria 10 and Xilinx Virtex UltraScale devices, delivering adaptive 0.82 V–0.93 V output with 10 mV resolution and ≤30 mV settling error within 10 ms per step.

For engineers reviewing the LTC3884EUK datasheet, LTC3884EUK pinout, LTC3884EUK application, or LTC3884EUK equivalent, this controller enables deterministic power-up/down sequencing across multiple rails, autonomous fault response via shared FAULT bus, and accurate closed-loop VOUT trimming - critical for FPGA timing closure, thermal management, and power-performance optimization in high-density embedded systems.

Technical Context

The LTC3884EUK implements a dual-channel, current-mode control architecture with independent loop compensation per phase, supporting up to 6-phase interleaving per channel via external phase synchronization. It integrates a 16-bit ADC for voltage, current, temperature, and duty cycle monitoring, all accessible via PMBus v1.3 commands including VOUT_COMMAND, VOUT_MODE, and READ_VIN/READ_IOUT.

Its SmartVID2 interface complies with Altera's specification for autonomous FPGA core voltage negotiation, requiring VOUT_MODE = 0x01 (direct mode) and 10 ms command-to-settle latency with ±30 mV accuracy. The device uses a shared SHARE_CLK bus for time-synchronized multi-rail sequencing and coordinates down-sequencing with energy-dissipation timing for bulk capacitor discharge.

Key Specifications

Pinout & Package

The LTC3884EUK is housed in a 28-pin 4 mm × 5 mm QFN package with exposed pad (ES suffix), optimized for thermal performance in high-current applications. Pin functions are validated per Analog Devices' official datasheet DS3884F.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel PMBus power controller applications.

Compared with LTC3887IUHF#PBF and TPS53689RTAT, the LTC3884EUK uniquely integrates SmartVID2 decoding, SHARE_CLK synchronization, and FAULT bus coordination - enabling fully autonomous, hardware-governed FPGA power delivery without host intervention or custom firmware.

Availability

LTC3884EUK is available at Aetrix Electronics and suitable for FPGA core power, ASIC multi-rail sequencing, and industrial embedded computing requiring stable component supply, long-term lifecycle assurance, and guaranteed PMBus interoperability.

Supply support for LTC3884EUK 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets since 1965.

The LTC3884EUK belongs to Analog Devices' Power System Management (PSM) IC family, designed specifically to address the voltage accuracy, sequencing determinism, and telemetry depth required by advanced FPGAs and ASICs in high-reliability systems.

FAQ

What is the primary function of the LTC3884EUK in FPGA power systems?

The LTC3884EUK serves as a dual-output, PMBus-enabled synchronous buck controller optimized for FPGA core voltage delivery. It executes SmartVID2 commands autonomously, regulates output voltage to ±0.5% accuracy, sequences multiple rails via SHARE_CLK, and reports real-time telemetry - all without host processor involvement. This makes the LTC3884EUK essential for achieving timing closure and thermal efficiency in Altera Arria 10 and Xilinx Virtex UltraScale designs.

Does the LTC3884EUK support true SmartVID2 protocol compliance out of the box?

Yes, the LTC3884EUK natively supports SmartVID2 per Altera's specification: it accepts VOUT_COMMAND and VOUT_MODE PMBus commands, achieves 10 mV voltage steps, settles within ±30 mV of target in ≤10 ms, and operates across the 0.82 V–0.93 V range without external VID interface logic. This autonomous behavior is confirmed in Analog Devices' DS3884F datasheet and validated in Application Note AN158.

How does the LTC3884EUK handle power supply sequencing for multi-rail FPGA systems?

The LTC3884EUK uses the SHARE_CLK pin to synchronize timing across all connected PSM ICs, enabling deterministic up/down sequencing that matches FPGA vendor requirements - such as Altera Arria 10's Group 1→2→3 up-order and reverse down-order. Each LTC3884EUK stores its own sequence timers in EEPROM, then aligns enable/disable events to the shared clock edge, eliminating software dependency and jitter accumulation.

Can the LTC3884EUK operate without a host microcontroller after initial configuration?

Yes. The LTC3884EUK retains full configuration - including PMBus command maps, sequencing timers, fault thresholds, and VOUT trim values - in on-chip EEPROM. Once programmed, it boots autonomously, executes SmartVID2 requests, sequences rails, and responds to faults without host interaction. This "set-and-forget" capability is critical for headless industrial and aerospace deployments where the LTC3884EUK must function independently.

What fault protection features are built into the LTC3884EUK?

The LTC3884EUK provides programmable overvoltage (OV), undervoltage (UV), overcurrent (OC), and overtemperature (OT) protection. Upon fault detection, it asserts the open-drain FAULT bus, triggering coordinated shutdown across all linked PSM ICs. Simultaneously, it logs timestamped fault context - including VOUT, IOUT, die temperature, and register state - to internal EEPROM for post-failure analysis, ensuring robust field reliability for the LTC3884EUK.