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Analog Devices Inc. LTC3887IUJ-2#PBF
- Part No.:
- LTC3887IUJ-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ-2#PBF.pdf
- Description:
- DUAL OUTPUT POLYPHASE STEP-DOWN
- Quantity:
- Payment:
- Shipping:
Inventory:4,672
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Product details
Overview
LTC3887IUJ-2#PBF from Analog Devices is a dual-channel, current-mode synchronous step-down DC/DC controller with integrated digital power system management (PSM) via PMBus/SMBus/I2C. It supports 0.5 V to 5.5 V output per channel, ±0.5% VOUT accuracy, and operates from 4.5 V to 24 V input. Designed for autonomous point-of-load regulation in high-density server and telecom power systems, it enables real-time telemetry, fault logging, and sequencing across multiple rails.
For engineers reviewing the LTC3887IUJ-2#PBF datasheet, LTC3887IUJ-2#PBF pinout, LTC3887IUJ-2#PBF application, or LTC3887IUJ-2#PBF equivalent, key selection criteria include its dual-channel current-mode control, EEPROM-configurable sequencing, ±0.5% output accuracy, DCR or ΔVBE temperature sensing support, and 6 × 6 mm QFN-40 package with exposed thermal pad.
Technical Context
The LTC3887IUJ-2#PBF implements a fast analog voltage loop with digital supervision-enabling stable regulation while supporting PMBus commands for margining, trimming, and fault response. It features inferred input current sense, programmable switching frequency (up to 1 MHz), and three-state PWM control for seamless power rail sequencing.
It integrates an on-chip LDO powered from VIN, supports both internal and external temperature sensing (ΔVBE and direct), and includes dedicated registers for energy monitoring, black-box fault logging, and cascaded multi-device coordination without host software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 24 V - Supports standard intermediate bus voltages in telecom and industrial systems. |
| VOUT Range (per channel) | 0.5 V to 5.5 V - Covers core, I/O, and auxiliary rail requirements with fine-grained digital adjustment. |
| VOUT Accuracy | ±0.5% - Ensures tight regulation for sensitive ASIC/FPGA supplies without external calibration. |
| Max Output Current | 30 A per phase - Scalable with external MOSFETs; enables high-current POL designs up to 60 A total. |
| Switching Frequency | Programmable up to 1 MHz - Balances efficiency and size; allows use of compact ceramic output capacitors. |
| Digital Interface | PMBus v1.3 / SMBus / I2C - Enables standardized telemetry readback (VOUT, IOUT, POUT, temperature) and configuration. |
| Temperature Sensing | ΔVBE and direct sensor inputs - Supports accurate junction and board temperature monitoring for thermal derating. |
Pinout & Package
The LTC3887IUJ-2#PBF is housed in a 6 mm × 6 mm, 40-pin QFN package with exposed thermal pad (UJ package code), optimized for high-power density and thermal performance in multilayer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1, PGOOD2 | Power-good status outputs | Open-drain signals indicating regulated output stability per channel; used for sequencing and fault isolation. |
| CLKIN, CLKOUT | Frequency synchronization I/O | Allows master-slave clock alignment across multiple controllers to reduce EMI and enable interleaving. |
| SCL, SDA | PMBus/SMBus/I2C interface | Two-wire digital bus for configuration, telemetry, and fault logging; supports hot-plug and multi-drop topology. |
| ITH1, ITH2 | Current limit threshold inputs | Analog pins setting per-channel peak current limit; compatible with resistor-divider or DAC-based dynamic adjustment. |
| VC1, VC2 | Output voltage feedback inputs | High-impedance inputs for resistive divider feedback; support remote sensing and precision regulation. |
| SS1, SS2 | Soft-start timing inputs | Capacitor-programmed ramp rate control for controlled inrush current during startup per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode controllers | Enables precise, isolated regulation of two critical rails (e.g., core + I/O) with independent loop compensation and fault handling. |
| EEPROM-based configuration storage | Persists settings (VOUT, sequencing delays, OV/UV thresholds) across power cycles-no host firmware required for autonomous operation. |
| Black-box fault logging | Records timestamped fault events (overvoltage, overtemperature, undervoltage) with pre-fault telemetry for root-cause analysis. |
| Three-state PWM control | Supports seamless power-up/power-down sequencing by enabling/disabling gate drive without changing duty cycle or frequency. |
| Energy and power telemetry | Real-time measurement of input/output power and energy consumption-critical for dynamic power budgeting in datacenter applications. |
Applications
| Server CPU Core Supply | Telecom Baseband Power |
|---|---|
|
Use Scenario: Regulating 0.8 V/40 A core voltage for high-performance x86 or ARM processors in 1U servers. IC Role / Device Role / Timing Role: Dual-channel controller managing primary core rail and secondary cache/memory I/O rail with synchronized soft-start and fault containment. Use Value: ±0.5% VOUT accuracy and real-time current telemetry ensure stable operation under dynamic load transients up to 100 A/µs. |
Use Scenario: Powering FPGA, ADC/DAC, and RF front-end ICs in 5G macro base stations with strict thermal and sequencing constraints. IC Role / Device Role / Timing Role: Digital power manager coordinating startup order between analog supply, digital core, and RF bias rails using EEPROM-stored delay profiles. Use Value: Cascadable PMBus interface enables centralized supervision of 8+ rails across multiple LTC3887IUJ-2#PBF devices on a single backplane. |
| Industrial PLC I/O Module | Medical Imaging Power Subsystem |
|
Use Scenario: Providing isolated, monitored 3.3 V and 5 V rails for digital I/O, communication interfaces, and microcontroller in ruggedized PLC modules. IC Role / Device Role / Timing Role: Dual-output controller delivering tightly regulated, sequenced supplies with built-in overtemperature shutdown and fault logging for compliance reporting. Use Value: Direct temperature sensor input and ΔVBE sensing allow accurate thermal derating across -40°C to +105°C ambient operating range. |
Use Scenario: Generating low-noise, highly stable 1.2 V and 1.8 V supplies for high-speed image sensor arrays and signal processing ASICs in MRI/PET systems. IC Role / Device Role / Timing Role: Precision POL controller with <0.5% output drift over time and temperature, supporting long-duration diagnostic scans requiring zero voltage drift. Use Value: EEPROM-stored trim values compensate for aging effects in output divider resistors, maintaining accuracy over 10+ year product lifetimes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3887IUJ#PBF | Single-channel variant with identical feature set, package, and register map; lacks second PWM output and associated control logic. | Suitable only for single-rail systems; cannot replace LTC3887IUJ-2#PBF in dual-rail configurations without redesign. | Select when only one regulated output is needed and board space or cost optimization is prioritized. |
| LTC3884IUJ#PBF | Supports higher VIN (up to 38 V), dual-channel, but lacks three-state PWM and energy telemetry; uses same 6 × 6 QFN-40 package. | Better suited for industrial 24 V input systems where extended input range outweighs need for advanced sequencing or power logging. | Choose for 24–36 V intermediate bus applications where sequencing complexity is lower and energy monitoring is not required. |
Compared with LTC3887IUJ#PBF and LTC3884IUJ#PBF, the LTC3887IUJ-2#PBF uniquely combines dual-channel current-mode control, three-state PWM for robust sequencing, and full PMBus energy telemetry-making it optimal for high-reliability, multi-rail datacenter and telecom power systems requiring autonomous fault response and lifetime calibration retention.
Availability
LTC3887IUJ-2#PBF is available at Aetrix Electronics and suitable for server power delivery, 5G base station POL regulation, and industrial PLC power subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887IUJ-2#PBF 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.
The LTC3887IUJ-2#PBF belongs to Analog Devices' Power System Management (PSM) product line, designed specifically to replace analog-only controllers in mission-critical power systems where digital configurability, telemetry, and autonomous fault management are essential.
FAQ
What is the primary function of the LTC3887IUJ-2#PBF in a power system?
The LTC3887IUJ-2#PBF functions as a dual-channel, digitally managed synchronous step-down DC/DC controller. It regulates two independent output voltages with precision feedback, real-time telemetry, and PMBus-based configuration. Unlike analog-only controllers, the LTC3887IUJ-2#PBF embeds EEPROM, fault logging, and sequencing logic-enabling autonomous operation without host processor intervention in applications like server and telecom power supplies.
Does the LTC3887IUJ-2#PBF support input voltage ranges beyond 24 V?
No-the LTC3887IUJ-2#PBF has a specified VIN range of 4.5 V to 24 V, as confirmed in Analog Devices' official documentation and selection guides. For input voltages up to 38 V, the LTC3884IUJ#PBF is the validated alternative. Exceeding 24 V on the LTC3887IUJ-2#PBF may cause permanent damage or unpredictable behavior, and no derating or external protection scheme restores compliance.
How does the LTC3887IUJ-2#PBF handle thermal monitoring and protection?
The LTC3887IUJ-2#PBF supports both ΔVBE junction sensing and external diode temperature monitoring, allowing accurate die-temperature tracking for thermal derating and overtemperature shutdown. Its internal ADC digitizes temperature data and logs thermal faults in EEPROM. This dual-sensing capability ensures reliable operation across -40°C to +105°C ambient conditions, and is fully implemented in the LTC3887IUJ-2#PBF without requiring external components.
Can the LTC3887IUJ-2#PBF be used without programming its EEPROM?
Yes-the LTC3887IUJ-2#PBF ships from Analog Devices with a factory-default EEPROM configuration that enables immediate operation: default VOUT = 1.2 V per channel, standard sequencing, and basic fault thresholds. Full digital functionality-including custom margins, telemetry, and black-box logging-is unlocked only after configuration via LTpowerPlay or in-circuit PMBus commands, but basic regulation works out-of-box.
What package type and thermal characteristics does the LTC3887IUJ-2#PBF use?
The LTC3887IUJ-2#PBF uses a 6 mm × 6 mm, 40-pin QFN package with exposed thermal pad (UJ suffix), rated for θJA ≈ 30°C/W on a 4-layer JEDEC board. Its thermal pad must be soldered to a solid copper plane for effective heat dissipation. This package enables high-current POL designs in space-constrained applications, and is mechanically and thermally distinct from larger BGA variants like the LTM4676 series.
LTC3887IUJ-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 34V
- Frequency - Switching:
- 250kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus
- Control Features:
- Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3887IUJ-2#PBF FAQ
1.How can I place an order for LTC3887IUJ-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ-2#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3887IUJ-2#PBF reliable?
The price and inventory of LTC3887IUJ-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887IUJ-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ-2#PBF?
LTC3887IUJ-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ-2#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3887IUJ-2#PBF?
For technical support, including LTC3887IUJ-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ-2#PBF requirements.
6.How does Aetrix verify that LTC3887IUJ-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ-2#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3887IUJ-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ-2#PBF?
All LTC3887IUJ-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ-2#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3887IUJ-2#PBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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