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Analog Devices Inc. LTC3887IUJ-1#TRPBF
- Part No.:
- LTC3887IUJ-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ-1#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
LTC3887IUJ-1#TRPBF 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 integrates 16-bit ADC telemetry for VIN, IIN, VOUT, IOUT, temperature, duty cycle, and faults-enabling precise closed-loop control in high-current server and telecom power rails.
For engineers reviewing the LTC3887IUJ-1#TRPBF datasheet, LTC3887IUJ-1#TRPBF pinout, LTC3887IUJ-1#TRPBF application, or LTC3887IUJ-1#TRPBF equivalent, this device serves as a digitally programmable, AEC-Q100-qualified controller for multi-phase buck conversion with real-time telemetry, fault logging, and EEPROM-based configuration persistence in demanding industrial and automotive embedded power systems.
Technical Context
The LTC3887IUJ-1#TRPBF implements analog current-mode control with digital supervision: its constant-frequency PWM core uses external ramp compensation and internal slope compensation to stabilize DCR- or resistor-based current sensing across up to six phases. The device features three-state PWM outputs (not gate drivers) to interface directly with DrMOS power stages, enabling fast transient response and accurate phase interleaving.
Its PMBus v1.3-compliant interface supports full readback of telemetry-including 16-bit VOUT, 10-bit VIN, 16-bit IOUT (via differential sense), and 0.25°C-resolution temperature-with configurable alert thresholds, event-triggered sequencing, and fault logging with ECC-protected internal EEPROM. All configuration parameters-including voltage setpoints, soft-start timing, OV/UV limits, and frequency synchronization-are stored nonvolatilely and survive power cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 24V - supports wide-input industrial and telecom supplies without external LDO biasing. |
| VOUT Range | 0.5V to 5.5V per channel - covers core, I/O, and auxiliary rail requirements in modern processors and FPGAs. |
| Output Accuracy | ±0.5% over –40°C to 125°C - enables tight regulation margins without external calibration. |
| ADC Resolution | 16-bit VOUT / 10-bit VIN / 16-bit IOUT - provides sub-mV and sub-mA telemetry resolution for closed-loop monitoring. |
| Min On-Time | 45ns - allows high-frequency operation (up to 1MHz) with low-duty-cycle regulation at high input-to-output ratios. |
| EEPROM Endurance | 10,000 write cycles - supports field firmware updates and dynamic configuration tuning over product lifetime. |
| PMBus Speed | Up to 400kHz - enables rapid telemetry polling and real-time parameter adjustment in dense multi-rail systems. |
Pinout & Package
Package: 40-pin (6mm × 6mm) QFN with exposed thermal pad (UJ package); RoHS-compliant, lead-free finish; operating junction temperature range –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–24V; powers INTVCC regulator and internal logic; requires local 1µF ceramic bypass. |
| TG0/TG1 | Three-state PWM outputs | Drive DrMOS high-side gates; compatible with 3.3V logic-level DrMOS inputs; no integrated MOSFET drivers (LTC3887-1 variant). |
| ISENSE0+/–, ISENSE1+/– | Differential current sense inputs | Supports low-value shunt or DCR sensing; 16-bit ADC digitizes current with ±1% TUE above 6mV differential. |
| VSENSE0+/–, VSENSE1+/– | Remote differential output voltage sense | Enables Kelvin sensing for accurate load regulation; 41kΩ/37kΩ input resistance minimizes loading error. |
| SCL/SDA | PMBus/I²C bidirectional data lines | 400kHz max clock rate; open-drain with 3mA sink capability; support SMBus timeout and CRC protection. |
| ALERT | Open-drain fault indicator | Asserts low on any enabled fault (OV, UV, OC, OT); configurable via PMBus command MFR_FAULT_LOG. |
| WP | Write-protect enable | Hardware lock for EEPROM writes; pulled high internally; tied low to disable all nonvolatile programming. |
| RUN0/RUN1 | Enable inputs per channel | Active-high logic; 0.8V/1.35V thresholds; 10µs digital filtering prevents false turn-on from noise. |
| GPIO0/GPIO1 | Configurable general-purpose I/O | Programmable as input (with 3µs filtering) or open-drain output; usable for sequencing handshaking or status signaling. |
| SHARE_CLK | PolyPhase current-sharing clock | Outputs synchronized clock for up to six-phase interleaving; phase alignment controlled via MFR_PWM_CONFIG register. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output control | Each channel fully programmable for voltage, current limit, soft-start, sequencing, margining, and OV/UV thresholds via PMBus or resistors. |
| Real-time telemetry with ECC logging | Simultaneous readback of VIN, IIN, VOUT, IOUT, die/external temperature, duty cycle, and fault status; all logged with error-correcting code in EEPROM. |
| DrMOS-compatible three-state PWM | Eliminates need for external level shifters; supports fast turn-off and shoot-through prevention in high-efficiency DrMOS-based designs. |
| Auto-calibrating digital servo loop | Uses internal 16-bit ADC and EEPROM-stored gain/offset coefficients to maintain ±0.5% VOUT accuracy without manual trimming. |
| AEC-Q100 qualified | Rated for automotive applications (Grade I: –40°C to 125°C); includes enhanced ESD protection and fault response timing validated per AEC standards. |
Applications
| Server VR13/VR14 Core Power | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Regulating CPU/GPU core voltage (0.7V–1.2V) with dynamic voltage/frequency scaling (DVFS) and telemetry-driven thermal throttling. IC Role / Device Role / Timing Role: Dual-channel PolyPhase controller managing two independent 3+3 phase rails; synchronizes switching via SHARE_CLK to reduce input ripple. Use Value: ±0.5% VOUT accuracy ensures compliance with VR14 spec; real-time IOUT readback enables per-rail current balancing and predictive failure analysis. |
Use Scenario: Powering radar SoC and vision processor in autonomous driving ECUs requiring ASIL-B compliant power sequencing and fault reporting. IC Role / Device Role / Timing Role: Primary DC/DC controller with EEPROM-stored startup sequence, watchdog-triggered soft-shutdown, and ALERT-driven CAN fault signaling. Use Value: AEC-Q100 qualification and internal fault logging meet ISO 26262 diagnostic coverage requirements; three-state PWM simplifies integration with automotive-grade DrMOS. |
| Telecom Line Card Power | Industrial FPGA/ASIC Power Supply |
|
Use Scenario: Delivering 12A @ 1.2V and 20A @ 3.3V from 12V backplane in 5G baseband units with hot-swap and remote monitoring. IC Role / Device Role / Timing Role: Dual-output controller with PMBus telemetry over shared I²C bus; supports remote differential sensing for long PCB traces. Use Value: 45ns minimum on-time enables 500kHz operation at 1.2V/12V ratio; telemetry readback reduces need for external multimeters during field diagnostics. |
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA with multiple voltage domains (core, I/O, auxiliary) requiring precise sequencing and margin testing. IC Role / Device Role / Timing Role: Digital power manager executing EVENT-based sequencing (e.g., VCCINT before VCCAUX) and margining via PMBus commands. Use Value: Internal EEPROM stores complete BOM-locked configuration; eliminates boot-time host initialization; GPIO pins provide hardware handshake to FPGA configuration logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output digital polyphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3887EUJ-1#TRPBF | Same functionality and pinout; rated for 0°C to 85°C ambient (commercial grade), not –40°C to 125°C. | Not qualified for automotive or extended-temperature industrial use; lacks AEC-Q100 validation. | Select when operating environment stays within 0°C–85°C and cost sensitivity outweighs extended temp requirement. |
| MP8770GL-10-Z | Monolithic dual-output buck converter (integrated MOSFETs); no PMBus telemetry; only analog configuration via resistors. | Lacks real-time telemetry, EEPROM storage, and digital sequencing; suitable only for fixed-function, low-complexity rails. | Choose for space-constrained, cost-sensitive designs where digital management is unnecessary and 3A–6A per rail suffices. |
Compared with LTC3887IUJ-1#TRPBF, the LTC3887EUJ-1#TRPBF offers identical digital features but reduced temperature rating, while the MP8770GL-10-Z trades telemetry and configurability for integration and lower BOM count-making it viable only in non-telemetry, non-automotive applications.
Availability
LTC3887IUJ-1#TRPBF is available at Aetrix Electronics and suitable for server VR13/VR14 core power, automotive ADAS domain controllers, and telecom line card power requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3887IUJ-1#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, industrial automation, communications, and automotive markets.
The LTC3887 family belongs to Analog Devices' Power by Linear™ digital power management portfolio, designed specifically for high-reliability, multi-rail, telemetry-enabled power systems in servers, networking equipment, and safety-critical automotive electronics.
FAQ
What is the key functional difference between LTC3887IUJ-1#TRPBF and the standard LTC3887IUJ#TRPBF?
The LTC3887IUJ-1#TRPBF is the -1 variant, which features three-state PWM outputs optimized for direct interfacing with DrMOS power stages-unlike the standard LTC3887IUJ#TRPBF that includes integrated N-channel gate drivers. This makes LTC3887IUJ-1#TRPBF ideal for high-efficiency, high-density designs using smart power stages, while retaining full PMBus telemetry, EEPROM configuration, and ±0.5% output accuracy.
Does LTC3887IUJ-1#TRPBF support AEC-Q100 qualification, and what does that mean for automotive use?
Yes, LTC3887IUJ-1#TRPBF is AEC-Q100 qualified (Grade I, –40°C to 125°C), meaning it has undergone stress testing for temperature cycling, humidity, ESD, and vibration per automotive reliability standards. This qualification validates its suitability for ADAS domain controllers and infotainment power supplies where functional safety and long-term robustness are mandatory-not just temperature rating.
How does the EEPROM in LTC3887IUJ-1#TRPBF enhance system reliability compared to volatile configuration storage?
The internal EEPROM in LTC3887IUJ-1#TRPBF stores all critical settings-including voltage setpoints, soft-start timing, fault thresholds, and sequencing order-with ECC protection. Unlike volatile registers, this ensures configuration persistence across power cycles, brownouts, and cold starts-eliminating boot-time host reprogramming and preventing misconfiguration-induced rail failures in unattended systems.
Can LTC3887IUJ-1#TRPBF operate with input voltages below 4.5V, and what are the constraints?
No-LTC3887IUJ-1#TRPBF specifies a minimum VIN of 4.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below 4.5V, the INTVCC regulator cannot sustain internal logic operation, and undervoltage lockout engages. For sub-4.5V inputs, an external bias supply to INTVCC is required, but this violates the recommended operating conditions and voids guaranteed performance.
What telemetry parameters can be read in real time from LTC3887IUJ-1#TRPBF, and at what resolution?
LTC3887IUJ-1#TRPBF supports real-time PMBus readback of VIN (10-bit, ±0.5% TUE), VOUT (16-bit, ±0.5% accuracy), IOUT (16-bit, ±1% TUE above 6mV sense voltage), die and external temperature (0.25°C resolution), duty cycle, and fault status. All values are updated every 90ms in round-robin mode unless accelerated via MFR_ADC_CONTROL.
LTC3887IUJ-1#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-1#TRPBF FAQ
1.How can I place an order for LTC3887IUJ-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ-1#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-1#TRPBF reliable?
The price and inventory of LTC3887IUJ-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ-1#TRPBF?
LTC3887IUJ-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ-1#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-1#TRPBF?
For technical support, including LTC3887IUJ-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ-1#TRPBF requirements.
6.How does Aetrix verify that LTC3887IUJ-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ-1#TRPBF?
All LTC3887IUJ-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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