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Analog Devices Inc. LTC3887IUJ#TRPBF
- Part No.:
- LTC3887IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,202
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Product details
Overview
LTC3887IUJ#TRPBF 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–24V input, 0.5V–5.5V dual VOUT ranges, and enables precise telemetry readback of VIN, IIN, VOUT, IOUT, temperature, duty cycle, and faults - deployed in high-current telecom and datacom power systems.
For engineers reviewing the LTC3887IUJ#TRPBF datasheet, LTC3887IUJ#TRPBF pinout, LTC3887IUJ#TRPBF application, or LTC3887IUJ#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed PolyPhase current sharing up to six phases, AEC-Q100 qualification status, and real-world design meaning for soft-start, sequencing, margining, and fault logging with ECC-protected EEPROM.
Technical Context
The LTC3887IUJ#TRPBF implements an analog current-mode control loop with constant-frequency PWM, supported by a 16-bit ADC for telemetry and internal EEPROM with error-correcting code (ECC) for configuration storage. Its dual-channel architecture enables independent programming of switching frequency (250kHz–1MHz), voltage, current limit, and phase offset via PMBus or external resistors.
It features remote differential sensing per channel, accurate PolyPhase current sharing across up to six phases, and programmable OV/UV/fault responses including peak overcurrent, timing faults, and thermal warnings. The device integrates gate drivers (TG/BG) with 45ns minimum on-time and supports synchronized operation via SYNC pin with configurable phase relationships relative to the SYNC falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-range industrial and telecom inputs without external LDO biasing. |
| Output Voltage Range | 0.5V to 5.5V (dual independent channels) - covers core logic, memory, and I/O rails in modern SoCs/FPGAs. |
| Output Voltage Accuracy | ±0.5% over temperature - ensures stable regulation under thermal stress without recalibration. |
| Switching Frequency | 250kHz to 1MHz - adjustable via resistor or PMBus; enables optimization of size vs. efficiency in compact designs. |
| Minimum On-Time | 45ns - allows high VIN-to-low VOUT conversion (e.g., 12V→0.6V at 1MHz) without pulse skipping. |
| PMBus Compliance | Fully compliant with PMBus v1.3 - enables standard telemetry, configuration, and fault logging in multi-rail systems. |
| EEPROM Retention | 10 years at TJ ≤ 125°C with ECC - preserves critical settings across power cycles and field updates. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive under-hood and industrial embedded environments. |
Pinout & Package
Package: 40-pin (6mm × 6mm) 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 gate drivers - must be decoupled near package. |
| TG0/TG1 | Top-gate drive outputs | Drive external high-side N-MOSFETs; rated –5V to 34V transient - requires bootstrap capacitor (BOOSTx). |
| BG0/BG1 | Bottom-gate drive outputs | Drive low-side N-MOSFETs; 6V max swing - complements TG with 30ns rise/fall time and 30ns dead-time control. |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– |
Differential output voltage sense inputs | Enable Kelvin sensing for ±0.5% accuracy; reject PCB trace IR drop - essential for high-current PolyPhase stability. |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– |
Differential current sense inputs | Support DCR or RSENSE current sensing; 16-bit ADC resolution enables <±1% IOUT_TUE telemetry. |
| TSNS0/TSNS1 | External temperature sensor inputs | Accept thermistor or diode-connected transistor; enable board-level thermal monitoring with ±3°C TUE. |
| SCL/SDA | PMBus/I²C bidirectional interface | 400kHz max clock; open-drain with 3mA sink capability - connects to system manager or host MCU for full digital control. |
| ALERT | Open-drain fault indicator | Asserts low on any enabled fault (OV/UV/OT/OC); supports daisy-chained fault propagation in multi-controller systems. |
| SHARE_CLK | PolyPhase current-sharing clock | Enables accurate interleaving across up to six phases; synchronizes switching edges to minimize input/output ripple. |
| WP | Write-protect enable input | Hardware lock for EEPROM writes - prevents accidental configuration changes during operation or firmware update. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent digital power controllers | Each channel fully programmable for VOUT, ILIM, soft-start, sequencing, and margining - eliminates discrete DACs and supervisors. |
| Integrated 16-bit ADC with telemetry | Simultaneous readback of VIN, IIN, VOUT, IOUT, temperature, duty cycle, and fault status - enables real-time health monitoring without external sensors. |
| ECC-protected internal EEPROM | Stores configuration, calibration data, and fault logs with error correction - ensures reliability over 10,000 write cycles and 10-year retention. |
| Analog current-mode control loop | Provides inherent cycle-by-cycle current limiting and fast transient response - avoids instability issues common in digital-only control loops. |
| Remote differential sensing & PolyPhase sharing | Supports up to six-phase operation with <±1% current matching - reduces thermal stress and improves power density in high-current applications. |
| AEC-Q100 qualified | Rated for automotive-grade reliability (Grade I: –40°C to +125°C) - suitable for ADAS, infotainment, and body control modules. |
Applications
| Telecom Power Shelf | Datacenter VRM |
|---|---|
|
Use Scenario: Dual-rail power delivery for FPGA, ASIC, and memory in 48V intermediate bus telecom shelves. IC Role / Device Role: Primary dual-phase controller managing 12V and 1.8V rails with telemetry and fault logging. Use Value: ±0.5% VOUT accuracy and 45ns min-on-time enable efficient 48V→1.8V conversion; PMBus enables centralized rack-level power management. |
Use Scenario: High-efficiency, digitally managed VRMs for CPU/GPU cores in cloud servers. IC Role / Device Role: Dual-output PolyPhase controller supporting dynamic voltage scaling and load-line regulation. Use Value: Independent sequencing and margining per rail ensure safe boot-up; EEPROM stores calibrated settings across firmware updates. |
| Automotive ADAS ECU | Industrial PLC Power Module |
|
Use Scenario: Powering radar SoC and image signal processor in autonomous driving ECUs. IC Role / Device Role: AEC-Q100-qualified dual controller delivering 3.3V I/O and 1.0V core rails with thermal derating. Use Value: TSNS inputs monitor heatsink temperature; ALERT pin triggers system shutdown before OT fault - meets ASIL-B functional safety requirements. |
Use Scenario: Compact, field-upgradable power module for programmable logic controllers in harsh factory environments. IC Role / Device Role: Digital controller with EEPROM-stored configurations enabling plug-and-play replacement without reprogramming. Use Value: Remote sensing compensates for long PCB traces; SYNC input allows synchronization with other power stages to reduce EMI. |
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 |
|---|---|---|---|
| LTC3887EUJ#TRPBF | Same silicon, extended temperature grade (–40°C to +125°C guaranteed, not just characterized) | Required for production releases needing full temp-range validation; higher test cost | Select when full industrial qualification and production traceability are mandatory. |
| LTC3887-1IUJ#TRPBF | Replaces integrated gate drivers with three-state PWM outputs for DrMOS compatibility; no internal LDO | Better suited for ultra-high-density designs using monolithic DrMOS power stages instead of discrete MOSFETs | Choose when using Infineon/ON Semi DrMOS devices and requiring lower layout complexity. |
Compared with LTC3887IUJ#TRPBF, the LTC3887EUJ#TRPBF offers guaranteed performance across the full –40°C to +125°C range, while the LTC3887-1IUJ#TRPBF trades gate drivers for DrMOS PWM compatibility - both retain identical PMBus functionality, EEPROM, and telemetry but serve distinct power stage architectures.
Availability
LTC3887IUJ#TRPBF is available at Aetrix Electronics and suitable for telecom power shelves, datacenter VRMs, and automotive ADAS ECUs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant digital power management.
Supply support for LTC3887IUJ#TRPBF 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, and industrial markets.
The LTC3887 series belongs to Analog Devices' Power by Linear™ digital power management product line, designed specifically for high-reliability, multi-rail, telemetry-enabled DC/DC systems in telecom, datacom, and automotive applications.
FAQ
What is the primary function of the LTC3887IUJ#TRPBF in a power system?
The LTC3887IUJ#TRPBF serves as a dual-output, PolyPhase synchronous step-down DC/DC controller with integrated gate drivers and PMBus digital management. It regulates two independent output voltages (0.5V–5.5V), provides real-time telemetry (VIN, IIN, VOUT, IOUT, temperature), and executes programmable functions like sequencing, margining, and fault logging - all within a single 40-pin QFN package. Its analog current-mode loop ensures stability while digital features simplify system-level power control.
Does the LTC3887IUJ#TRPBF support AEC-Q100 qualification?
Yes, the LTC3887IUJ#TRPBF is AEC-Q100 qualified for automotive applications (Grade I: –40°C to +125°C junction temperature). This qualification covers stress testing for temperature cycling, humidity, ESD, and latch-up, making it suitable for use in ADAS, infotainment, and body control modules where reliability under harsh conditions is critical. The device also includes ECC-protected EEPROM and robust fault handling to meet automotive functional safety expectations.
How does the LTC3887IUJ#TRPBF achieve ±0.5% output voltage accuracy?
The LTC3887IUJ#TRPBF achieves ±0.5% output voltage accuracy over temperature through a combination of on-chip trimming, auto-zeroing via its 16-bit ADC during servo mode, and remote differential sensing (VSENSE±). The internal reference and error amplifier (gm = 3 mmho) are designed for minimal drift, and the digital servo loop continuously corrects for thermal and load-induced errors - all verified across –40°C to +125°C per the datasheet's VOUTR0/VOUTR1 specifications.
Can the LTC3887IUJ#TRPBF operate without external configuration resistors?
Yes, the LTC3887IUJ#TRPBF can operate without external configuration resistors. All key parameters - including output voltage, switching frequency, device address, and sequencing delays - can be programmed and stored in its internal EEPROM via the PMBus interface. Resistors (e.g., on FREQ_CFG, VOUTn_CFG, ASEL0/1) provide optional hardware defaults or factory-set values, but full digital control is retained even with all RCONFIG pins left unconnected or tied to defined logic levels.
What telemetry data can be read back from the LTC3887IUJ#TRPBF via PMBus?
The LTC3887IUJ#TRPBF supports comprehensive telemetry readback via PMBus, including input voltage (VIN), input current (IIN), both output voltages (VOUT0/VOUT1), both output currents (IOUT0/IOUT1), internal die temperature, external temperatures (TSNS0/TSNS1), duty cycle, and fault status registers. All values are captured by the integrated 16-bit ADC and reported with documented accuracy (e.g., ±1% IOUT_TUE, ±3°C external TUE), enabling real-time health monitoring and predictive maintenance in mission-critical systems.
LTC3887IUJ#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3887IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3887IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ#TRPBF?
LTC3887IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ#TRPBF 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#TRPBF?
For technical support, including LTC3887IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3887IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ#TRPBF?
All LTC3887IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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