Analog Devices Inc. LTC3886EUKG

Overview

LTC3886EUKG from Analog Devices is a dual-output, polyphase DC/DC synchronous buck controller with PMBus interface, precision voltage regulation (±0.5% over line/load/temp), and integrated 12-bit ADC/DAC for real-time telemetry and closed-loop margining. It supports SmartVID2 voltage requests from FPGAs like Altera Arria 10 and Xilinx Virtex UltraScale, enabling adaptive core voltage optimization in high-performance computing and reconfigurable logic systems.

For engineers reviewing the LTC3886EUKG datasheet, LTC3886EUKG pinout, LTC3886EUKG application, or LTC3886EUKG equivalent, this controller delivers deterministic power sequencing, ±30 mV output settling accuracy within 10 ms per SmartVID step, autonomous boot voltage setup, and shared FAULT/SHARE_CLK coordination across multi-rail PSM systems.

Technical Context

The LTC3886EUKG implements two independent synchronous buck control loops with programmable phase interleaving up to 6-phase per channel, supporting up to 13 A per output when paired with external MOSFETs. Its internal 12-bit ADC measures VOUT, VIN, IOUT, temperature, and fault status with 0.25% full-scale accuracy.

It executes PMBus v1.3 commands including VOUT_COMMAND, VOUT_MARGIN_HIGH/LOW, and ON_OFF_CONFIG, and supports SmartVID2 protocol timing: 10 ms command interval, 10 mV step resolution, and ≤30 mV final error band. Sequencing is coordinated via open-drain SHARE_CLK (100 kHz) and FAULT busses for synchronized up/down ramping across distributed PSM ICs.

Key Specifications

Pinout & Package

Package: 28-lead 4 mm × 5 mm QFN (EUK) with exposed pad; RoHS-compliant, lead-free, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3886EUKG, LTC3887IUH#PBF increases PCB area and component count for dual-rail use, while TPS53689RTAT sacrifices voltage accuracy and system-level fault coordination - making LTC3886EUKG the only option delivering guaranteed ±0.5% regulation, SmartVID2 compliance, and native SHARE_CLK/FAULT integration in a single 4 mm × 5 mm package.

Availability

LTC3886EUKG is available at Aetrix Electronics and suitable for FPGA power delivery, telecom baseband processing, and industrial AI accelerator modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC3886EUKG 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 precision instrumentation, communications, and industrial markets since 1965.

The LTC3886EUKG belongs to Analog Devices' Power System Management (PSM) product line, engineered specifically for digitally controlled, multi-rail power systems in FPGAs, ASICs, and high-end processors demanding accuracy, telemetry, and coordinated sequencing.

FAQ

What is the primary function of the LTC3886EUKG in an FPGA power system?

The LTC3886EUKG serves as a dual-output, digitally controlled synchronous buck controller that regulates FPGA core and auxiliary voltages with ±0.5% accuracy while supporting SmartVID2 voltage requests and PMBus telemetry. In systems using Altera Arria 10 or Xilinx Virtex UltraScale FPGAs, the LTC3886EUKG executes real-time voltage adaptation, autonomous boot setup, and coordinated sequencing - ensuring timing closure without excess power dissipation. Its integrated ADC and SHARE_CLK capability make LTC3886EUKG central to deterministic, fault-aware power delivery.

Does the LTC3886EUKG support SmartVID2 protocol for dynamic FPGA voltage adjustment?

Yes, the LTC3886EUKG fully supports SmartVID2 protocol per Altera and Xilinx specifications: it accepts VOUT_COMMAND commands via PMBus, processes 10 mV voltage steps every 10 ms, and settles within ±30 mV of target in ≤10 ms. This enables direct communication with FPGA-embedded SmartVID IP blocks to deliver optimal core voltage (e.g., 0.82 V–0.93 V range) based on silicon-specific process corner and logic design. The LTC3886EUKG maintains static regulation after reaching target - critical for stable FPGA operation during compute-intensive tasks.

How does the LTC3886EUKG coordinate sequencing with other power management ICs?

The LTC3886EUKG uses two dedicated open-drain busses: SHARE_CLK (100 kHz timing reference) and FAULT (global fault indicator). All ADI PSM devices (e.g., LTC2975, LTM4677) connect to these busses to synchronize sequence start, ramp timing, and fault response. When LTC3886EUKG pulls SHARE_CLK low, all devices halt timing until ready - establishing deterministic "time zero." If any device asserts FAULT, LTC3886EUKG initiates coordinated shutdown. This eliminates need for external CPLDs or timing controllers in multi-rail FPGA power systems.

What telemetry functions does the LTC3886EUKG provide, and how are they accessed?

The LTC3886EUKG integrates a 12-bit ADC measuring output voltage (VOUT), input voltage (VIN), output current (IOUT), and internal die temperature - all accessible via standard PMBus commands (READ_VOUT, READ_IOUT, READ_TEMPERATURE_1). Measurements are calibrated to 0.25% full-scale accuracy and stored in internal registers for real-time readback. Telemetry data feeds closed-loop margining, thermal derating, and black-box fault logging. No external sensors or ADCs are required, reducing BOM count and layout complexity in space-constrained FPGA power designs.

Is the LTC3886EUKG pin-compatible with other members of the LTC388x family?

No, the LTC3886EUKG is not pin-compatible with LTC3887 or LTC3884. It uses a unique 28-lead 4 mm × 5 mm QFN (EUK) package optimized for dual-channel operation, with dedicated pins for dual PGOOD outputs, independent ITH thresholds, and shared SHARE_CLK/FAULT busses. While functionally aligned within the LTC388x PSM family, pinout differences mean PCB redesign is required when substituting. Always verify footprint and thermal pad layout against the official LTC3886EUKG datasheet before migration.