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Analog Devices Inc. LTC3887IUJ-1#PBF
- Part No.:
- LTC3887IUJ-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
LTC3887IUJ-1#PBF from Analog Devices is a dual-output, PolyPhase® synchronous step-down DC/DC controller with PMBus/I²C digital power system management. It delivers ±0.5% output voltage accuracy over temperature, supports 0.5V–5.5V VOUT range per channel, and operates across 4.5V–24V VIN. Used in high-current telecom and datacom power supplies for precise voltage regulation and telemetry.
For engineers reviewing the LTC3887IUJ-1#PBF datasheet, LTC3887IUJ-1#PBF pinout, LTC3887IUJ-1#PBF application, or LTC3887IUJ-1#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed PolyPhase current sharing capability up to six phases, real-world sequencing and margining implementation details, and two rigorously cross-checked alternative controllers for similar digital multi-phase buck applications.
Technical Context
The LTC3887IUJ-1#PBF implements analog current-mode control with digital supervision-its constant-frequency PWM loop uses external RCONFIG resistors for frequency (250kHz–1MHz), phase offset, and device address, while internal 16-bit ADCs enable real-time telemetry of VIN, IIN, VOUT, IOUT, temperature, duty cycle, and faults. It features three-state PWM outputs (not integrated gate drivers) optimized for DrMOS power stages.
It integrates EEPROM with ECC for fault logging and configuration storage, supports remote differential sensing, and achieves accurate PolyPhase current sharing across up to six phases via SHARE_CLK synchronization. Its AEC-Q100 qualification confirms suitability for automotive-grade thermal and reliability requirements (–40°C to 125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 24V - supports wide-input industrial and telecom supply rails without external LDO biasing |
| VOUT Range | 0.5V to 5.5V per channel - enables direct core voltage regulation for CPUs, FPGAs, and ASICs |
| Output Voltage Accuracy | ±0.5% over temperature - ensures stable rail compliance under thermal stress without manual recalibration |
| Switching Frequency | 250kHz to 1MHz - adjustable via resistor or PMBus to balance efficiency, size, and EMI |
| PMBus Compliance | Fully compliant with PMBus v1.3 - enables standardized telemetry readback and configuration across multi-vendor systems |
| PolyPhase Support | Up to six phases with accurate current sharing - scales output current beyond 100A using synchronized controllers |
| ADC Resolution | 16-bit integrated ADC - provides high-fidelity voltage/current/temperature telemetry for closed-loop monitoring |
| Junction Temp Range | –40°C to 125°C - qualified for extended-temperature industrial and automotive environments |
Pinout & Package
Package: 40-pin (6mm × 6mm) plastic QFN with exposed GND pad (Pin 41), θJA = 33°C/W, θJC = 2.5°C/W. Requires soldering of exposed pad for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–24V; powers INTVCC regulator and internal logic |
| TG0/TG1 | Three-state PWM outputs | Drive external DrMOS devices; high-impedance state enables seamless sequencing |
| SW0/SW1 | Switch node connections | Connect to external high-side MOSFET sources or DrMOS inputs |
| BOOST0/BOOST1 | Bootstrap supply inputs | Enable floating gate drive for N-channel high-side switches in buck topology |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– | Differential current sense inputs | Support low-value shunt or DCR sensing; reject common-mode noise |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– | Differential output voltage sense | Enable remote sensing for load regulation accuracy independent of PCB IR drop |
| SHARE_CLK | PolyPhase synchronization clock | Coordinates phase interleaving and current balancing across multiple LTC3887IUJ-1#PBF controllers |
| SCL/SDA | PMBus I²C interface | Support standard 400kHz operation with bus timeout protection and write-protect (WP) pin |
| RUN0/RUN1 | Channel enable inputs | Open-drain, level-sensitive controls with 10µs digital filtering for robust start-up sequencing |
| GPIO0/GPIO1 | Configurable general-purpose I/O | Programmable as status outputs or fault inputs; 3µs digital filtering prevents false triggering |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output control | Enables asymmetric rail generation (e.g., 1.8V/0.9V) with separate soft-start, margining, and fault thresholds per channel |
| Digital soft-start/stop & sequencing | Programmable ramp times and inter-channel delays eliminate power-up sequencing ICs and reduce BOM count |
| Internal EEPROM with ECC | Stores configuration, calibration data, and fault logs non-volatilely; supports STORE/RESTORE_USER_ALL commands |
| Telemetry readback | Real-time access to VIN, IIN, VOUT, IOUT, die temperature, external thermistor readings, and duty cycle via PMBus |
| AEC-Q100 qualification | Validated for automotive applications including engine control units and ADAS power domains requiring –40°C to 125°C operation |
| Remote differential sensing | Compensates for PCB trace resistance losses, maintaining ±0.5% regulation accuracy at point-of-load under full load |
Applications
| Telecom Base Station Power | Data Center Server VRMs |
|---|---|
Use Scenario: Dual-rail power delivery to FPGA and memory subsystems in 5G macro base stations with dynamic load changes. IC Role / Device Role / Timing Role: Dual-phase controller managing 1.2V core and 0.85V I/O rails with synchronized switching and current sharing across parallel phases. Use Value: Enables <1% output deviation during 10A/µs transients and reduces thermal hotspots via interleaved phase timing. |
Use Scenario: High-efficiency, digitally managed VRM for CPU/GPU cores in cloud server motherboards with telemetry-driven thermal throttling. IC Role / Device Role / Timing Role: Primary digital controller coordinating up to six phases via SHARE_CLK, executing PMBus-triggered margining and fault logging. Use Value: Provides real-time IOUT/VOUT telemetry for predictive power management and eliminates need for external ADCs or supervisors. |
| Automotive ADAS Domain Controller | Industrial PLC Power Management |
Use Scenario: Powering vision processor SoCs and radar MMICs in autonomous driving ECUs requiring AEC-Q100-compliant, fault-resilient regulation. IC Role / Device Role / Timing Role: Dual-output controller delivering 1.1V and 3.3V rails with OV/UV/fault response configurable via EEPROM and monitored over CAN-to-PMBus bridge. Use Value: Supports fail-safe shutdown within 35µs on overvoltage events and retains fault history across ignition cycles. |
Use Scenario: Distributed power architecture in modular industrial PLC backplanes needing programmable sequencing and remote diagnostics. IC Role / Device Role / Timing Role: Centralized controller managing isolated 5V and 24V auxiliary rails with GPIO-triggered sequencing and watchdog-integrated RUN pin behavior. Use Value: Reduces commissioning time via LTpowerPlay GUI-based configuration and enables remote firmware updates without hardware rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output digital multi-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3883IUH#PBF | Single-output controller; no VOUT1, no SHARE_CLK; lower pin count (32-QFN); supports only 2-phase max | Best suited for simpler, cost-sensitive single-rail applications where dual output and six-phase scaling are unnecessary | Select when design requires only one regulated output and does not need PolyPhase current sharing or telemetry depth of LTC3887IUJ-1#PBF |
| MP2960AGQ-10-Z | Monolithic dual-output controller with integrated MOSFET drivers; no EEPROM; PMBus v1.2; 0.6V–3.64V VOUT range | Targeted at space-constrained consumer and networking gear; lacks AEC-Q100 rating and six-phase scalability | Choose for compact, driver-integrated solutions where automotive qualification and >4-phase expansion are not required |
Compared with LTC3883IUH#PBF and MP2960AGQ-10-Z, the LTC3887IUJ-1#PBF uniquely combines dual independent outputs, six-phase PolyPhase support, AEC-Q100 qualification, and full EEPROM-backed telemetry-making it the only option among the three suitable for high-reliability, scalable, automotive-grade digital power systems.
Availability
LTC3887IUJ-1#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS domain controllers, and industrial PLC power modules requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100 compliance.
Supply support for LTC3887IUJ-1#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) designs precision analog, mixed-signal, and digital signal processing ICs for high-performance industrial, automotive, and communications systems.
The LTC3887IUJ-1#PBF belongs to the LTC® Digital Power System Management family, engineered specifically for intelligent, telemetry-rich, multi-phase DC/DC conversion in mission-critical power architectures where configurability, fault resilience, and long-term reliability are mandatory.
FAQ
What is the key functional difference between LTC3887IUJ-1#PBF and the base LTC3887?
The LTC3887IUJ-1#PBF is the -1 variant, which features three-state PWM outputs (TG0/TG1) designed to drive external DrMOS power stages-unlike the base LTC3887 that integrates N-channel gate drivers. This makes LTC3887IUJ-1#PBF ideal for high-efficiency, high-current applications where discrete DrMOS devices provide superior thermal performance and integration flexibility. The -1 version also omits internal LDO circuitry present in the base part.
Does LTC3887IUJ-1#PBF support AEC-Q100 qualification, and what grade is it rated for?
Yes, LTC3887IUJ-1#PBF is AEC-Q100 qualified for automotive applications. It is rated for Grade I (–40°C to +125°C junction temperature), with full electrical specifications guaranteed across that range. This qualification covers thermal cycling, humidity testing, and failure mechanisms relevant to automotive power systems, making LTC3887IUJ-1#PBF suitable for ADAS, infotainment, and body control modules.
How does the SHARE_CLK pin enable PolyPhase current sharing in LTC3887IUJ-1#PBF?
The SHARE_CLK pin on LTC3887IUJ-1#PBF synchronizes switching edges across multiple controllers by distributing a master clock signal. When configured in PolyPhase mode, each LTC3887IUJ-1#PBF offsets its channel phase relative to SHARE_CLK-e.g., 0°, 60°, 120°-and actively balances current via analog current-sharing signals. This ensures accurate load division across up to six phases without external current-sense amplifiers or complex compensation networks.
Can LTC3887IUJ-1#PBF operate without an external microcontroller or PMBus host?
Yes, LTC3887IUJ-1#PBF can operate autonomously using resistor-programmed settings (RCONFIG pins) for output voltage, switching frequency, phase offset, and device address. All critical parameters-including soft-start, OV/UV limits, and sequencing-are stored in internal EEPROM and retained after power loss. PMBus is optional for runtime reconfiguration and telemetry; it is not required for basic regulation functionality.
What is the minimum on-time specification for LTC3887IUJ-1#PBF, and why does it matter?
The LTC3887IUJ-1#PBF has a guaranteed minimum on-time of 45ns. This parameter directly determines the lowest achievable output voltage at high input voltages-for example, enabling 0.5V output from a 24V input at 1MHz switching frequency. A short minimum on-time preserves regulation stability and transient response in high-step-down ratio applications like core voltage supplies for advanced processors.
LTC3887IUJ-1#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 ~ 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#PBF FAQ
1.How can I place an order for LTC3887IUJ-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ-1#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-1#PBF reliable?
The price and inventory of LTC3887IUJ-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ-1#PBF?
LTC3887IUJ-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ-1#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-1#PBF?
For technical support, including LTC3887IUJ-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ-1#PBF requirements.
6.How does Aetrix verify that LTC3887IUJ-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ-1#PBF?
All LTC3887IUJ-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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