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Analog Devices Inc. LTC3887IUJ#PBF
- Part No.:
- LTC3887IUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ#PBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:280
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Product details
Overview
LTC3887IUJ#PBF from Analog Devices is a dual-output, PolyPhase® synchronous step-down DC/DC controller with integrated N-channel MOSFET gate drivers, PMBus/I²C digital power system management, and ±0.5% output voltage accuracy over temperature. It supports 4.5V–24V input, 0.5V–5.5V dual VOUT ranges, and programmable sequencing, margining, and fault telemetry for high-current server and telecom power rails.
For engineers reviewing the LTC3887IUJ#PBF datasheet, LTC3887IUJ#PBF pinout, LTC3887IUJ#PBF application, or LTC3887IUJ#PBF equivalent, key selection criteria include its 40-pin QFN package, 45ns minimum on-time, AEC-Q100 qualification, internal 16-bit ADC for telemetry, and EEPROM-based configuration storage with ECC protection.
Technical Context
The LTC3887IUJ#PBF implements an analog current-mode control loop with constant-frequency PWM, enabling precise regulation across load transients while supporting up to six-phase PolyPhase operation via remote differential sensing and accurate current sharing. Its digital interface enables real-time readback of VIN, IIN, VOUT, IOUT, temperature, duty cycle, and fault status.
It integrates dual gate drivers (TG/BG per channel), internal INTVCC and VDD33/VDD25 regulators, and a 16-bit ADC with auto-zeroing servo loop for ±0.5% VOUT accuracy. Configuration is stored in on-chip EEPROM with error-correcting code (ECC) and supports PMBus v1.3 commands including STORE_USER_ALL and READ_TEMPERATURE_1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-range industrial and telecom inputs without external bias supply |
| Output Voltage Range | 0.5V to 5.5V (dual independent outputs) - covers core, I/O, and auxiliary rail requirements |
| VOUT Accuracy | ±0.5% over –40°C to 125°C - ensures stable CPU/GPU voltage under thermal stress |
| Switching Frequency | 250kHz to 1MHz - configurable via resistor or PMBus for EMI optimization and efficiency trade-offs |
| Minimum On-Time | 45ns - enables high VIN-to-low VOUT conversion (e.g., 12V→0.8V at 1MHz) |
| ADC Resolution | 16-bit for VOUT/IOUT/temperature telemetry - provides sub-mV and sub-µA measurement granularity |
| EEPROM Endurance | 10,000 write cycles with ECC - ensures reliable firmware and calibration storage over product lifetime |
Pinout & Package
Package: 40-pin (6mm × 6mm) plastic QFN with exposed GND pad (Pin 41), rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 4.5V–24V; powers INTVCC regulator and gate drivers |
| TG0/TG1 | Top-gate driver outputs | Drive external high-side N-MOSFETs; 30ns rise/fall time into 3300pF |
| BG0/BG1 | Bottom-gate driver outputs | Drive external low-side N-MOSFETs; 30ns rise/fall time into 3300pF |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– | Differential output voltage sense | Enables remote sensing for <0.5% load regulation; supports PolyPhase current sharing |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– | Differential current sense inputs | Supports DCR or RSENSE current monitoring with 10–125µV LSB resolution |
| SDA/SCL | PMBus/I²C bidirectional data/clock | Compliant with PMBus v1.3; 400kHz max clock rate; open-drain with 0.4V VOL @ 3mA |
| ALERT | Open-drain fault indicator | Asserts low on OV/UV/IOUT/OT faults; supports daisy-chained fault propagation |
| RUN0/RUN1 | Enable inputs per channel | Active-high; 0.8V/1.35V logic thresholds; 10µs digital filtering for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output control | Enables asymmetric rail generation (e.g., 1.8V@30A + 3.3V@20A) with separate sequencing and margining |
| Integrated gate drivers | Eliminates need for external driver ICs; supports >30A per phase with optimized dead-time control |
| PMBus telemetry readback | Real-time access to VIN, IIN, VOUT, IOUT, die/external temperature, duty cycle, and fault flags via standard commands |
| EEPROM with ECC | Stores configuration, calibration, and fault logs non-volatilely; prevents bit corruption during automotive thermal cycling |
| AEC-Q100 qualification | Validated for automotive Grade I (–40°C to 125°C); includes accelerated life testing and failure mode analysis |
Applications
| High-Performance Computing Power | Telecom Base Station PSU |
|---|---|
Use Scenario: Dual-rail power delivery to FPGA and ASIC cores requiring tight voltage tolerance and dynamic load response. IC Role / Device Role / Timing Role: Primary PolyPhase controller managing two independent 1.0V/1.2V outputs with synchronized phasing and current balancing across four phases. Use Value: ±0.5% VOUT accuracy and 45ns min-on-time enable stable 1.2V@60A operation from 12V input at 500kHz, reducing output capacitance by 30% vs legacy controllers. | Use Scenario: Distributed 48V-to-12V/3.3V conversion in macro/micro base station RF power amplifiers. IC Role / Device Role / Timing Role: Digital power manager providing telemetry, sequencing, and fault logging for redundant 12V intermediate bus and 3.3V logic rails. Use Value: PMBus readback of IOUT and temperature enables predictive maintenance; EEPROM stores calibration to maintain <±2% current accuracy over 10-year field life. |
| Automotive ADAS Domain Controller | Enterprise SSD Power Architecture |
Use Scenario: Powering vision processor SoCs and radar MMICs in autonomous driving ECUs with functional safety requirements. IC Role / Device Role / Timing Role: AEC-Q100 qualified dual controller delivering 1.8V core and 0.85V I/O rails with independent soft-start, OV/UV protection, and fault reporting via ALERT pin. Use Value: Internal 16-bit ADC and ECC EEPROM meet ASIL-B diagnostic coverage targets; remote sensing compensates for PCB voltage drop in high-current traces. | Use Scenario: High-efficiency, digitally managed power for NVMe SSDs with bursty NAND write loads and strict thermal limits. IC Role / Device Role / Timing Role: Dual-output controller generating 1.8V NAND I/O and 3.3V PCIe interface rails with dynamic margining and thermal derating. Use Value: Telemetry readback of VOUT/IOUT/temperature allows host firmware to throttle writes before thermal throttling occurs; 100ms fault response prevents NAND corruption. |
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 |
|---|---|---|---|
| LTC3880IUJ#PBF | Narrower VOUT range (0.5V–3.3V), no LDO for VDD33, lower EEPROM endurance (5k cycles) | Lacks support for >3.3V rails like DDR4 VPP or 5V aux; less suitable for post-regulator applications | Select LTC3887IUJ#PBF when 5.5V VOUT capability, enhanced telemetry, or higher EEPROM reliability is required. |
| TPS53689RTAT | TI PMBus controller with 3.3V-only VDDIO; no internal VDD33/VDD25 regulators; 12-bit ADC resolution | Requires external LDOs for digital rails; lower telemetry precision limits closed-loop margining accuracy | Choose LTC3887IUJ#PBF for self-contained power with integrated regulators and 16-bit telemetry fidelity. |
Compared with LTC3880IUJ#PBF and TPS53689RTAT, the LTC3887IUJ#PBF delivers broader output voltage range, higher ADC resolution, integrated digital supply regulation, and AEC-Q100 qualification-making it optimal for high-reliability, multi-rail systems demanding long-term configuration stability and precise closed-loop control.
Availability
LTC3887IUJ#PBF is available at Aetrix Electronics and suitable for high-current distributed power systems, telecom/datacom PSUs, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887IUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3887IUJ#PBF belongs to the Power by Linear™ digital power controller family, designed specifically for intelligent, telemetry-enabled, multi-phase DC/DC conversion in mission-critical infrastructure where configurability, reliability, and real-time monitoring are essential.
FAQ
What is the maximum input voltage supported by the LTC3887IUJ#PBF?
The LTC3887IUJ#PBF supports a maximum input voltage of 24V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This rating applies across the full operating temperature range (–40°C to 125°C). Operation above 24V risks permanent damage; for 34V input capability, the pin-compatible LTC3887-2 variant must be used instead of the LTC3887IUJ#PBF.
Does the LTC3887IUJ#PBF include integrated gate drivers?
Yes, the LTC3887IUJ#PBF integrates dual N-channel MOSFET gate drivers (TG0/BG0 and TG1/BG1) capable of driving high-side and low-side external FETs. Each driver delivers 30ns rise/fall times into 3300pF loads and supports precise dead-time control. This eliminates the need for external driver ICs and simplifies layout for high-current PolyPhase designs.
How does the LTC3887IUJ#PBF achieve ±0.5% output voltage accuracy?
The LTC3887IUJ#PBF achieves ±0.5% output voltage accuracy over temperature through a combination of on-chip 16-bit ADC-based servo loop calibration, internal reference trimming, and analog current-mode control architecture. The datasheet confirms this specification applies across –40°C to 125°C when using the ADC auto-zero function, as verified in the Electrical Characteristics table under VOUTR0/VOUTR1 set point accuracy.
Is the LTC3887IUJ#PBF qualified for automotive applications?
Yes, the LTC3887IUJ#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to 125°C). This qualification is explicitly stated in the Features section and confirmed in the Order Information table, which lists automotive-grade variants with #WPBF suffix. The device undergoes stress testing for thermal cycling, humidity, and vibration per AEC-Q100 Rev H standards.
What telemetry parameters can be read back from the LTC3887IUJ#PBF via PMBus?
The LTC3887IUJ#PBF supports PMBus readback of VIN, IIN, VOUT (per channel), IOUT (per channel), internal/external temperature (T0/T1/T2), duty cycle, and fault status (OV, UV, OT, OC, etc.). All telemetry is digitized by the integrated 16-bit ADC and accessible via standard PMBus commands such as READ_VIN, READ_VOUT, READ_IOUT, and READ_TEMPERATURE_1.
LTC3887IUJ#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#PBF FAQ
1.How can I place an order for LTC3887IUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ#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#PBF reliable?
The price and inventory of LTC3887IUJ#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ#PBF?
LTC3887IUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ#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#PBF?
For technical support, including LTC3887IUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ#PBF requirements.
6.How does Aetrix verify that LTC3887IUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ#PBF?
All LTC3887IUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ#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#PBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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