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Analog Devices Inc. LTC3887IUJ-1
- Part No.:
- LTC3887IUJ-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ-1.pdf
- Description:
- IC POWER MANAGEMENT
- Quantity:
- Payment:
- Shipping:
Inventory:3,586
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Product details
Overview
LTC3887IUJ-1 from Analog Devices is a dual-output, PolyPhase® synchronous step-down DC/DC controller with integrated N-channel MOSFET gate drivers and PMBus/I²C digital power system management. It delivers ±0.5% output voltage accuracy over temperature, supports 4.5V to 24V input, 0.5V–5.5V VOUT range per channel, and enables precise telemetry readback (VIN, IIN, VOUT, IOUT, temperature, duty cycle, faults) in high-current server and telecom power systems.
For engineers reviewing the LTC3887IUJ-1 datasheet, LTC3887IUJ-1 pinout, LTC3887IUJ-1 application, or LTC3887IUJ-1 equivalent, this device serves as a digitally programmable, AEC-Q100 qualified dual-phase controller for intelligent power regulation-requiring attention to its 40-pin QFN package, EEPROM-based fault logging, analog current-mode control loop, and 45ns minimum on-time capability.
Technical Context
The LTC3887IUJ-1 implements a constant-frequency, analog current-mode control architecture with dual independent channels, each supporting remote differential sensing and accurate PolyPhase current sharing across up to six phases. Its internal 16-bit ADC digitizes voltage, current, and temperature telemetry for real-time PMBus reporting.
Digital configuration is enabled via resistor-programmable pins (VOUTn_CFG, FREQ_CFG, ASEL0/1) and persistent storage in internal EEPROM with ECC. The device integrates an INTVCC regulator (5V), dual VDD33/VDD25 LDOs, and supports frequency synchronization from 250kHz to 1MHz using the SYNC pin or PMBus commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and telecom rails without external biasing |
| Output Voltage Range | 0.5V to 5.5V per channel - covers core, I/O, and auxiliary rail requirements |
| VOUT Accuracy | ±0.5% over temperature - enables tight regulation for advanced processors and FPGAs |
| Minimum On-Time | 45ns - allows high-frequency operation with low-duty-cycle outputs (e.g., 1.0V @ 1MHz) |
| ADC Resolution | 16-bit - provides high-fidelity telemetry for closed-loop digital power management |
| EEPROM Endurance | 10,000 write cycles - ensures reliable firmware and configuration updates in field-deployed systems |
| PMBus Compliance | I²C-based PMBus v1.3 - enables interoperability with industry-standard power management tools like LTpowerPlay |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial embedded environments |
Pinout & Package
Package: 40-pin (6mm × 6mm) plastic QFN with exposed GND pad (Pin 41), θJA = 33°C/W, TJMAX = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–24V; powers INTVCC and gate drivers |
| TG0/TG1 | Top-gate drive outputs | Drive external high-side N-MOSFETs; 30ns rise/fall time into 3300pF |
| BG0/BG1 | Bottom-gate drive outputs | Drive external low-side N-MOSFETs; 30ns rise/fall time into 3300pF |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– | Differential output voltage sense inputs | Enable remote sensing for ±0.5% accuracy; reject PCB IR drop |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– | Differential current sense inputs | Support DCR or discrete resistor sensing; 16-bit ADC digitization |
| SCL/SDA | PMBus/I²C bidirectional interface | 400kHz max clock; open-drain; supports multi-device bus topology |
| ALERT | Open-drain fault indicator | Asserts low on OV/UV/IOUT/OT/UT/fault events; configurable via PMBus |
| RUN0/RUN1 | Channel enable inputs | Active-high; support sequencing, soft-start delay, and margining control |
| WP | Write-protect input | Hardware lock for EEPROM writes; prevents accidental configuration changes |
| SHARE_CLK | PolyPhase current-sharing clock | Enables accurate interleaving and load balancing across up to six phases |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel PolyPhase control | Enables scalable, high-current power delivery with <±1% phase current mismatch |
| Integrated gate drivers | Eliminates need for external driver ICs; supports 45ns min on-time at 1MHz |
| Telemetry readback | Real-time access to VIN, IIN, VOUT, IOUT, die/external temperature, duty cycle, and fault status |
| EEPROM with ECC | Persists configuration, calibration data, and fault logs across power cycles; 10-year retention |
| Digital soft-start/stop & sequencing | Programmable ramp rates, delays, and inter-channel timing via PMBus or resistors |
| AEC-Q100 qualification | Validated for automotive applications including engine control units and ADAS domain controllers |
Applications
| Server VR13/VR14 CPU Power | Telecom Base Station PSU |
|---|---|
Use Scenario: Dual-rail power delivery for multi-core Xeon or AMD EPYC processors requiring tightly regulated 0.8V core and 1.2V SoC supplies with dynamic current sharing. IC Role / Device Role / Timing Role: Dual-phase controller managing two independent buck stages with synchronized switching, remote sensing, and PMBus telemetry for dynamic voltage/frequency scaling (DVFS). Use Value: ±0.5% VOUT accuracy and 45ns min on-time ensure stable operation during rapid load transients; EEPROM stores per-CPU calibration data for consistent performance across platforms. | Use Scenario: High-efficiency, digitally managed 48V-to-12V/3.3V conversion in 5G macro base station power shelves with thermal monitoring and fault logging. IC Role / Device Role / Timing Role: Dual-output PolyPhase controller coordinating multiple phases across distributed power modules, using SHARE_CLK for precise interleaving and SDA/SCL for centralized PMBus supervision. Use Value: Telemetry readback of IOUT and temperature enables predictive maintenance; AEC-Q100 qualification supports extended life in harsh outdoor enclosures. |
| Automotive ADAS Domain Controller | Industrial PLC Power Management |
Use Scenario: Powering radar, camera, and AI accelerator subsystems in autonomous driving ECUs requiring redundant 1.8V, 3.3V, and 5V rails with fault containment. IC Role / Device Role / Timing Role: Dual-channel controller implementing sequenced startup/shutdown, OV/UV/OT protection, and GPIO-driven fault response for functional safety compliance (ISO 26262 ASIL-B). Use Value: Internal EEPROM stores fault logs with timestamps; ALERT pin triggers system-level watchdog reset; WP pin prevents runtime configuration corruption. | Use Scenario: Programmable power for modular I/O backplanes in factory automation systems where rail voltages and sequencing must adapt to varying fieldbus modules (PROFINET, EtherCAT). IC Role / Device Role / Timing Role: Digitally reconfigurable controller enabling field-upgradable VOUT, current limits, and soft-start profiles via PMBus without hardware change. Use Value: Resistor-programmable VOUTn_CFG/FREQ_CFG pins allow factory-set defaults; PMBus override enables runtime optimization for different module loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output digital DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3883IUJ-1 | Single-output controller; no second VOUT channel or IOUT telemetry on Channel 2 | Not suitable for dual-rail systems requiring independent regulation and monitoring of both outputs | Select only when single-rail digital control suffices and cost reduction outweighs loss of redundancy and telemetry depth |
| MP8796BGL-10-Z | No PMBus interface; analog-only configuration via resistors; no EEPROM or fault logging | Lacks digital telemetry, sequencing, and field-upgradability required for cloud-managed infrastructure | Choose for cost-sensitive, fixed-function applications where digital management is unnecessary |
Compared with LTC3883IUJ-1 and MP8796BGL-10-Z, the LTC3887IUJ-1 uniquely combines dual independent outputs, full PMBus telemetry, EEPROM-persistent configuration, and AEC-Q100 qualification-making it the only option among the three for automotive-grade, dual-rail, digitally managed power in mission-critical systems.
Availability
LTC3887IUJ-1 is available at Aetrix Electronics and suitable for server VR13/VR14 CPU power, 5G telecom base station PSUs, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887IUJ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, industrial, and automotive markets.
The LTC3887 product line delivers digitally enhanced, dual-output PolyPhase DC/DC controllers designed for intelligent, telemetry-rich power systems in data centers, telecom infrastructure, and automotive electronics-emphasizing configurability, reliability, and standards compliance (PMBus, AEC-Q100).
FAQ
What is the primary function of the LTC3887IUJ-1 in a power system?
The LTC3887IUJ-1 functions as a dual-output, PolyPhase synchronous step-down DC/DC controller with integrated gate drivers and PMBus digital power management. It regulates two independent output voltages (0.5V–5.5V), manages phase interleaving, reads back real-time telemetry (VIN, IOUT, temperature), and stores configuration in EEPROM-enabling intelligent, adaptive power delivery in servers, telecom, and automotive systems. The LTC3887IUJ-1 is specifically optimized for high-accuracy, high-reliability applications requiring ±0.5% VOUT stability and AEC-Q100 qualification.
Does the LTC3887IUJ-1 support both resistor-based and digital configuration?
Yes, the LTC3887IUJ-1 supports hybrid configuration: switching frequency, output voltage, device address, and phase offset can be set via external resistors on pins like FREQ_CFG, VOUT0_CFG, ASEL0/1, and PHAS_CFG-or dynamically programmed and stored in EEPROM via the PMBus/I²C interface. This dual-mode flexibility allows factory-default settings with field-upgradable parameters. The LTC3887IUJ-1 retains all user configurations across power cycles using its internal EEPROM with ECC protection.
How does the LTC3887IUJ-1 achieve ±0.5% output voltage accuracy?
The LTC3887IUJ-1 achieves ±0.5% output voltage accuracy over temperature through a combination of high-precision internal reference, 16-bit ADC-based digital servo loop, remote differential sensing (VSENSE±), and auto-zero calibration during startup. Its analog current-mode control loop maintains stability under transient loads, while EEPROM-stored calibration coefficients compensate for board-level drift. This accuracy is verified across –40°C to +125°C and applies to both VOUT0 and VOUT1 outputs of the LTC3887IUJ-1.
What fault protection features are implemented in the LTC3887IUJ-1?
The LTC3887IUJ-1 implements comprehensive fault protection including output overvoltage (OV), undervoltage (UV), overcurrent (IOUT), input overvoltage (VIN OV), internal/external overtemperature (OT/UT), and timing faults. Each fault triggers configurable responses-such as immediate shutdown, latched fault, or retry-with status logged in nonvolatile EEPROM. The ALERT pin asserts open-drain low on any active fault, and PMBus registers provide detailed fault cause and timestamp. These protections are fully programmable and persist across power cycles in the LTC3887IUJ-1.
Is the LTC3887IUJ-1 pin-compatible with other members of the LTC3887 family?
No, the LTC3887IUJ-1 is not pin-compatible with LTC3887-1 or LTC3887-2 variants. While all share the same 40-pin QFN package, pin functions differ significantly: LTC3887IUJ-1 uses TG0/TG1 gate drivers, whereas LTC3887IUJ-1#WTRPBF (this part) has PWM0/PWM1 outputs for DrMOS compatibility, and LTC3887-2 supports higher VIN (up to 34V) and lacks an internal LDO. Pin mapping, driver type, and voltage ratings are variant-specific-PCB layout must match the exact LTC3887IUJ-1 datasheet pinout.
LTC3887IUJ-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 ~ 24V
- 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-1 FAQ
1.How can I place an order for LTC3887IUJ-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ-1 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-1 reliable?
The price and inventory of LTC3887IUJ-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887IUJ-1 is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ-1?
LTC3887IUJ-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ-1 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-1?
For technical support, including LTC3887IUJ-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ-1 requirements.
6.How does Aetrix verify that LTC3887IUJ-1 is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ-1 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-1 meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ-1?
All LTC3887IUJ-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ-1, 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-1 part is unused and in its original packaging.
Return procedure for LTC3887IUJ-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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