Analog Devices Inc. LTC3883EUH-1

Overview

LTC3883EUH-1 from Analog Devices is a dual-output, polyphase DC/DC synchronous buck controller with integrated PMBus interface, precision voltage regulation (±0.5% over temperature), and real-time telemetry for FPGA and ASIC core power delivery. It supports SmartVID2-compliant voltage commands, 0.5 V to 3.5 V output range per channel, and autonomous sequencing up/down via SHARE_CLK. It is used in high-reliability Arria 10 and Virtex UltraScale FPGA power systems requiring tight voltage accuracy and dynamic adaptation.

For engineers reviewing the LTC3883EUH-1 datasheet, LTC3883EUH-1 pinout, LTC3883EUH-1 application, or LTC3883EUH-1 equivalent, this controller delivers verified ±0.5% output voltage accuracy, 10 ms SmartVID step response, 30 mV settling tolerance, and time-based sequencing coordination across multi-rail PSM systems - critical for timing-closure-sensitive FPGA core supplies.

Technical Context

The LTC3883EUH-1 implements two independent current-mode synchronous buck controllers with programmable phase interleaving (up to 6-phase total), each supporting external MOSFET drivers and adaptive voltage positioning (AVP). Its embedded 12-bit ADC measures input/output voltage, current (via sense resistor or DCR), and temperature with ±1°C accuracy.

It operates as a full PMBus v1.3-compliant device with VOUT_MODE and VOUT_COMMAND support, enabling direct SmartVID2 communication from Altera/Xilinx FPGAs. The controller executes autonomous up/down sequencing using shared timing via the open-drain SHARE_CLK bus and coordinated fault handling over the FAULT bus.

Key Specifications

Pinout & Package

Package: 32-lead (5 mm × 5 mm) QFN with exposed pad (EUH); thermally enhanced for high-current control IC operation in dense FPGA power planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3884IUH#PBF and TPS53679RSLR, the LTC3883EUH-1 uniquely provides native dual-rail control with hardware-coordinated sequencing and fault propagation - essential for Arria 10/Virtex UltraScale systems requiring zero-software, deterministic power-up/down without host CPU involvement.

Availability

LTC3883EUH-1 is available at Aetrix Electronics and suitable for FPGA core power, ASIC voltage optimization, and multi-domain SoC sequencing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and aerospace programs.

Supply support for LTC3883EUH-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

Analog Devices is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management technologies for precision signal chain and power system applications.

The LTC3883EUH-1 belongs to the Power System Management (PSM) controller family, designed specifically to meet the stringent voltage accuracy, sequencing, and telemetry demands of advanced FPGAs and ASICs in compute- and signal-intensive systems.

FAQ

What is the primary function of the LTC3883EUH-1 in an FPGA power system?

The LTC3883EUH-1 serves as a dual-output, PMBus-enabled synchronous buck controller that delivers tightly regulated core voltage to FPGAs such as the Intel Arria 10 and Xilinx Virtex UltraScale. It executes autonomous SmartVID2 voltage adaptation, time-based sequencing, and real-time telemetry - ensuring timing closure while minimizing power waste. The LTC3883EUH-1 replaces discrete control + monitoring solutions with a single IC that integrates regulation, communication, and fault coordination.

Does the LTC3883EUH-1 support Altera SmartVID2 protocol natively?

Yes, the LTC3883EUH-1 fully supports Altera SmartVID2 via standard PMBus commands VOUT_MODE and VOUT_COMMAND. It accepts dynamic voltage requests from the FPGA's internal VID register and adjusts output within 10 ms per 10 mV step, settling to within ±30 mV of target - meeting the exact specification cited in Analog Dialogue 52-11 for Arria 10 SmartVID operation. The LTC3883EUH-1 requires no external translation logic or firmware.

How does the LTC3883EUH-1 achieve ±0.5% output voltage accuracy?

The LTC3883EUH-1 achieves ±0.5% output voltage accuracy through a combination of factory-trimmed internal reference, differential Kelvin sensing inputs (VOUT0_SENSE±, VOUT1_SENSE±), and closed-loop digital calibration via PMBus. Its 12-bit ADC continuously monitors output conditions and compensates for PCB trace resistance, temperature drift, and load variation - maintaining specification across –40°C to +125°C ambient without external trimming. This accuracy is confirmed in the official LTC3883 datasheet Rev. C.

Can the LTC3883EUH-1 perform power supply sequencing without a host microcontroller?

Yes, the LTC3883EUH-1 performs fully autonomous up/down sequencing using its built-in timer and the shared SHARE_CLK bus - no host microcontroller is required. It coordinates timing with other PSM devices (e.g., LTC2975, LTM4676A) by synchronizing to a common 100 kHz clock, enabling deterministic enable/disable delays, ramp rates, and fault-triggered retries. This capability is explicitly validated for Arria 10 Group 1→2→3 up-sequencing and reverse down-sequencing per Analog Devices application documentation.

What package type and thermal characteristics does the LTC3883EUH-1 use?

The LTC3883EUH-1 is packaged in a 32-lead 5 mm × 5 mm QFN (EUH) with exposed thermal pad, rated for operation from –40°C to +125°C junction temperature. Its thermal resistance θ_JA is 36°C/W (with 2-layer 2 oz copper PCB layout per datasheet guidelines), enabling reliable operation in high-density FPGA power modules. The exposed pad must be soldered to a solid thermal plane for optimal heat dissipation - a requirement confirmed in the LTC3883EUH-1 datasheet layout recommendations.