Analog Devices Inc. LTC3882BIUJ

Overview

LTC3882BIUJ 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 power delivery. It supports SmartVID2 voltage commands, 0.5 V to 3.5 V output range per channel, and autonomous sequencing via SHARE_CLK. It is used in high-accuracy core voltage regulation for Xilinx Virtex UltraScale and Altera Arria 10 FPGAs.

For engineers reviewing the LTC3882BIUJ datasheet, LTC3882BIUJ pinout, LTC3882BIUJ application, or LTC3882BIUJ equivalent, this controller delivers deterministic timing-closure support, ±30 mV output settling accuracy within 10 ms, fault-aware down-sequencing coordination, and EEPROM-programmable configuration for production-ready FPGA power systems.

Technical Context

The LTC3882BIUJ implements a dual-channel, current-mode synchronous buck controller architecture with independent loop compensation per output. Each channel supports phase interleaving up to 6-phase operation via external clock synchronization and SHARE_CLK handshaking.

It integrates a PMBus 1.3-compliant interface supporting VOUT_COMMAND, VOUT_MODE, READ_VOUT, READ_IOUT, and PAGE commands, enabling dynamic voltage scaling and telemetry readback. Its SmartVID2 mode accepts 7-bit VID codes mapping to 10 mV steps across 0.82 V–0.93 V, matching Altera Arria 10 SmartVID requirements.

Key Specifications

Pinout & Package

Package: 40-pin 6 mm × 6 mm QFN (LTC3882BIUJ), exposed pad, RoHS-compliant, thermal pad soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3882BIUJ, LTC3883IUJ provides identical telemetry and SmartVID2 capability but requires duplication for dual-rail use, while TPS53689RTAR offers lower integration cost but forfeits system-level sequencing determinism and sub-0.5% accuracy needed for FPGA timing closure.

Availability

LTC3882BIUJ is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core regulation, and high-reliability embedded computing applications requiring stable component supply, long-term lifecycle assurance, and full PMBus telemetry support.

Supply support for LTC3882BIUJ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision power, sensing, and connectivity applications.

The LTC388x family was designed specifically for intelligent, digitally managed power delivery in FPGA, ASIC, and microprocessor systems-emphasizing accuracy, telemetry, and interoperable sequencing.

FAQ

What is the primary function of the LTC3882BIUJ in an FPGA power system?

The LTC3882BIUJ serves as a dual-output, PMBus-enabled synchronous buck controller that regulates and sequences core voltage rails for FPGAs such as Altera Arria 10 and Xilinx Virtex UltraScale. It executes SmartVID2 voltage commands, maintains ±0.5% output accuracy, and coordinates timing-aligned up/down sequencing via SHARE_CLK. The LTC3882BIUJ replaces discrete controllers and monitoring ICs with a single device capable of autonomous telemetry, fault logging, and EEPROM-based configuration.

Does the LTC3882BIUJ support SmartVID2 protocol natively?

Yes, the LTC3882BIUJ includes hardware-level SmartVID2 decoding logic that accepts 7-bit VID codes over PMBus and maps them to precise 10 mV output steps across 0.82 V–0.93 V. This eliminates software overhead and ensures deterministic response within 10 ms, meeting Altera Arria 10 SmartVID2 timing requirements. The LTC3882BIUJ does not require external firmware or host intervention to interpret or act on VID commands.

How does the LTC3882BIUJ achieve ±0.5% voltage accuracy over temperature?

The LTC3882BIUJ achieves ±0.5% output voltage accuracy from –40°C to 125°C through trimmed internal reference circuitry, matched feedback amplifier gain, and on-die temperature compensation of error amplifier offset. Its VFB input has <100 nA bias current and supports Kelvin remote sensing to cancel PCB trace IR drop. This accuracy is verified across production lots and is guaranteed in the datasheet-not derived from typical values or post-calibration.

Can the LTC3882BIUJ coordinate sequencing with other power system management ICs?

Yes, the LTC3882BIUJ uses the dedicated SHARE_CLK and FAULT open-drain buses to synchronize timing and fault response with other Analog Devices PSM ICs-including LTC2975, LTC2937, and LTM4676A. All devices share a common 100 kHz time base, enabling sub-millisecond alignment of enable/disable events, ramp timing, and fault-triggered shutdown across >10 rails. The LTC3882BIUJ can act as timing master or slave depending on configuration.

What telemetry data can be read from the LTC3882BIUJ via PMBus?

Via its PMBus 1.3 interface, the LTC3882BIUJ supports real-time readback of output voltage (READ_VOUT), output current (READ_IOUT), input voltage (READ_VIN), internal die temperature (READ_TEMPERATURE_1), and operational status (STATUS_WORD, STATUS_VOUT, STATUS_IOUT). It also logs fault events-including overvoltage, undervoltage, overcurrent, and overtemperature-with timestamps and pre-fault telemetry snapshots stored in internal EEPROM.