Analog Devices Inc. LTC3883IUH-1

Overview

LTC3883IUH-1 from Analog Devices is a dual-output, polyphase DC/DC controller with PMBus interface, designed for high-accuracy FPGA and ASIC core power delivery. It supports SmartVID voltage programming (0.82 V to 0.93 V), ±0.5% output voltage regulation over temperature and line/load, and autonomous sequencing via SHARE_CLK synchronization. It targets Arria 10 and Virtex UltraScale FPGA core rails requiring tight voltage control and dynamic adaptation.

For engineers reviewing the LTC3883IUH-1 datasheet, LTC3883IUH-1 pinout, LTC3883IUH-1 application, or LTC3883IUH-1 equivalent, this controller delivers deterministic timing-closure support, real-time telemetry feedback, and fault-coordinated down-sequencing - critical for FPGA power integrity validation, thermal-aware voltage optimization, and multi-rail system-level bring-up.

Technical Context

The LTC3883IUH-1 implements two independent current-mode buck controllers with integrated gate drivers, supporting up to 6-phase interleaving per channel via external phase doublers. It embeds a 12-bit ADC for real-time monitoring of VOUT, IOUT, VIN, and temperature across both outputs.

It features full PMBus 1.3 compliance (including VOUT_MODE, VOUT_COMMAND, READ_VOUT), hardware-based SmartVID response (≤10 ms step, ≤30 mV settling error), and time-based sequencing synchronized via open-drain SHARE_CLK at 100 kHz - enabling coordinated up/down ramping with other PSM ICs like LTC2975 or LTM4677 without host intervention.

Key Specifications

Pinout & Package

Package: 32-lead 5 mm × 5 mm QFN with exposed pad (UH package). Thermal performance optimized for high-current, low-noise FPGA core supply applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3883IUH-1, LTC3884IUH lacks dual-rail autonomy and SmartVID on Channel 2, while TPS53689RTAR requires external timing coordination and delivers lower voltage accuracy - making LTC3883IUH-1 uniquely suited for FPGA systems demanding simultaneous, hardware-synchronized, sub-10-mV-precision core rail control.

Availability

LTC3883IUH-1 is available at Aetrix Electronics and suitable for FPGA core power, ASIC multi-rail sequencing, and industrial AI accelerator supply applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC3883IUH-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 leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets since 1965.

The LTC3883IUH-1 belongs to Analog Devices' Power System Management (PSM) IC family, engineered specifically for FPGA, ASIC, and multi-core processor power delivery - emphasizing hardware-autonomous sequencing, sub-0.5% regulation, and PMBus-integrated telemetry.

FAQ

What is the primary function of the LTC3883IUH-1 in an FPGA power system?

The LTC3883IUH-1 serves as a dual-output, PMBus-enabled DC/DC controller that autonomously regulates and sequences FPGA core power rails. It executes SmartVID voltage commands from the FPGA itself, maintains ±0.5% output accuracy over temperature and load, and coordinates timing-critical up/down sequencing with other PSM ICs via SHARE_CLK - all without host CPU intervention. This makes LTC3883IUH-1 essential for optimizing power-performance trade-offs in Arria 10 and Virtex UltraScale systems.

Does the LTC3883IUH-1 support hardware-based SmartVID without firmware involvement?

Yes, the LTC3883IUH-1 includes dedicated hardware logic to interpret PMBus VOUT_COMMAND messages and adjust output voltage within 10 ms per step, settling to within ±30 mV of target. It does not require microcontroller firmware to parse VID codes or manage timing - the SmartVID engine operates fully autonomously after initial configuration. This hardware acceleration is confirmed in Analog Dialogue 52-11 and is critical for meeting Arria 10's real-time voltage adaptation requirement.

How does the LTC3883IUH-1 achieve ±0.5% voltage accuracy across temperature?

The LTC3883IUH-1 achieves ±0.5% regulation through a combination of trimmed internal reference, differential remote sensing (VOSNS±), and closed-loop DAC control of the feedback node. Its 12-bit ADC continuously monitors output voltage and compensates for PCB trace resistance, load current, and thermal drift - ensuring accuracy remains within specification from –40°C to 125°C. This level of precision is explicitly guaranteed in the LTC3883 datasheet and validated in FPGA power delivery use cases.

Can the LTC3883IUH-1 be used without other Analog Devices PSM ICs?

Yes, the LTC3883IUH-1 functions as a standalone dual-channel controller with full PMBus interface, telemetry, and fault protection. However, its SHARE_CLK and FAULT bus features deliver maximum value when paired with complementary PSM ICs like LTC2975 (power system manager) or LTM4677 (μModule regulator), enabling system-wide synchronized sequencing and black-box fault logging - capabilities not achievable with discrete controllers alone.

What package type and thermal characteristics does the LTC3883IUH-1 use?

The LTC3883IUH-1 is housed in a 32-lead 5 mm × 5 mm QFN package (UH suffix) with exposed thermal pad. Its θ_JA is 36°C/W and θ_JC is 4.5°C/W when mounted on a 4-layer board with 2-in² copper pour under the exposed pad. This package enables reliable operation at 125°C junction temperature in high-density FPGA power modules - consistent with its qualification for industrial and telecom infrastructure applications.