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Analog Devices Inc. LTC3887EUJ#PBF
- Part No.:
- LTC3887EUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887EUJ#PBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
LTC3887EUJ#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 interface, and real-time telemetry readback (VIN, IIN, VOUT, IOUT, temperature, duty cycle, faults). It supports 4.5V–24V input, 0.5V–5.5V output per channel, ±0.5% output voltage accuracy over temperature, and operates up to six-phase configurations for high-current server and telecom power rails.
For engineers reviewing the LTC3887EUJ#PBF datasheet, LTC3887EUJ#PBF pinout, LTC3887EUJ#PBF application, or LTC3887EUJ#PBF equivalent, this page delivers verified specifications including analog current-mode control loop architecture, 16-bit ADC telemetry, internal EEPROM with ECC, remote differential sensing, and AEC-Q100 qualification - all critical for digital power system management in high-reliability embedded and automotive designs.
Technical Context
The LTC3887EUJ#PBF implements a constant-frequency, analog current-mode control loop with programmable switching frequency (250kHz–1MHz), precise phase alignment across up to six phases, and independent soft-start/stop, sequencing, margining, and OV/UV protection per output. Its digital interface enables full configuration via PMBus commands or external resistors (RCONFIG pins), with settings stored in nonvolatile EEPROM.
Telemetry is acquired using a dedicated 16-bit ADC with auto-zero calibration, supporting simultaneous readback of input/output voltages and currents, internal/external temperatures, and fault status. The device integrates dual gate drivers (TG/BG) with 45ns minimum on-time, 30ns rise/fall times, and dead-time control - optimized for high-efficiency, high-density multiphase buck converters.
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 per channel - covers core logic, memory, FPGA, and ASIC supply requirements. |
| Output Voltage Accuracy | ±0.5% over –40°C to +125°C - ensures stable regulation under thermal stress without manual trimming. |
| Switching Frequency | 250kHz to 1MHz - configurable via resistor or PMBus; enables optimization of size, efficiency, and transient response. |
| Minimum On-Time | 45ns - supports high VIN-to-low VOUT conversion (e.g., 12V→0.6V) at high frequency without pulse-skipping instability. |
| Telemetry Resolution | 16-bit ADC for VOUT/IOUT, 10-bit for VIN/duty cycle - provides sub-mV and sub-mA precision for closed-loop monitoring. |
| EEPROM Endurance | 10,000 write cycles with ECC - guarantees reliable storage of configuration, fault logs, and calibration data over product lifetime. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed GND pad (Pin 41), θJA = 33°C/W, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input power rail | Supplies controller core and gate drivers; accepts 4.5V–24V with internal UVLO at 3.95V rising threshold. |
| TG0/TG1 | Top-gate drive outputs | Drive external high-side N-MOSFETs; rated for –5V to 34V transient, 30ns rise/fall into 3300pF load. |
| BG0/BG1 | Bottom-gate drive outputs | Drive low-side N-MOSFETs; synchronized with TG with 30ns dead-time control to prevent shoot-through. |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– |
Differential output voltage sense | Enables remote sensing for ±0.5% accuracy; supports Kelvin connections to minimize PCB IR drop error. |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– |
Differential current sense inputs | Accept DCR or shunt-based sensing; 16-bit ADC reads current with ±1% TUE above 6mV differential. |
| SCL/SDA | PMBus/I²C serial interface | Supports 400kHz operation; open-drain with 0.4V VOL @ 3mA; includes bus timeout protection and CRC. |
| ALERT | Open-drain fault indicator | Asserts low on any monitored fault (OV/UV/IOUT/OT); configurable via PMBus for latched or sticky behavior. |
| SHARE_CLK | PolyPhase current-sharing clock | Enables accurate interleaved current sharing across up to six phases when daisy-chained with other LTC3887 devices. |
| WP | Write-protect enable | Hardware lock for EEPROM writes; pulled high internally unless externally grounded or driven low. |
| GPIO0/GPIO1 | Configurable general-purpose I/O | Programmable as inputs (with 3µs digital filter) or open-drain outputs; usable for sequencing control or status signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output control | Each channel fully programmable for voltage, current limit, soft-start, sequencing, and margining - eliminates need for discrete supervisors. |
| Integrated gate drivers | Drives N-MOSFETs directly with matched timing (30ns tr/tf, 30ns dead time), reducing BOM count and layout complexity vs. external drivers. |
| Real-time telemetry with 16-bit ADC | Simultaneous measurement of VIN, VOUT, IOUT, temperature, and duty cycle - enables predictive maintenance and dynamic power scaling. |
| Nonvolatile EEPROM with ECC | Stores configuration, fault logs, and calibration data across power cycles; 10-year retention and 10,000-cycle endurance ensure field reliability. |
| AEC-Q100 qualified | Rated for automotive applications (Grade E, –40°C to +125°C); includes enhanced fault logging and robust bus communication for safety-critical systems. |
Applications
| High-Current Server VRMs | Telecom Line Cards |
|---|---|
|
Use Scenario: Dual-output 1.8V/20A and 0.5V/20A power delivery for CPU and memory subsystems in 1U rack servers. IC Role / Device Role / Timing Role: Primary PolyPhase controller managing six-phase interleaving, current sharing, and telemetry-driven thermal derating. Use Value: ±0.5% output accuracy and 45ns min-on-time enable stable 0.5V core supplies at 500kHz, reducing output capacitance by 30% vs. legacy controllers. |
Use Scenario: Hot-swappable line card with dual 3.3V/12A and 12V/3A rails requiring precise sequencing and fault reporting over backplane PMBus. IC Role / Device Role / Timing Role: Digital power manager providing programmable startup delay, voltage margining, and real-time IOUT/VOUT readback for system health monitoring. Use Value: Internal EEPROM stores per-card calibration data and fault history, enabling field-replaceable unit (FRU) traceability without host intervention. |
| Automotive ADAS ECUs | Industrial PLC Power Modules |
|
Use Scenario: Power management for radar processor and sensor fusion SoC in AEC-Q100-compliant autonomous driving ECU. IC Role / Device Role / Timing Role: Dual-channel controller with remote sensing, temperature-compensated current limiting, and fault-logging for ISO 26262 ASIL-B support. Use Value: AEC-Q100 qualification, internal temperature sensor (±1°C TUE), and ECC-protected EEPROM meet functional safety requirements for automotive deployment. |
Use Scenario: Modular 24V input, dual 5V/3.3V isolated power stage in programmable logic controller with firmware-updatable parameters. IC Role / Device Role / Timing Role: Configurable controller storing voltage setpoints, soft-start ramps, and fault thresholds in EEPROM for field reconfiguration. Use Value: PMBus interface allows OEMs to update power profiles via standard tooling (LTpowerPlay), eliminating hardware revisions for new I/O module variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output digital power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3880IUJ#PBF | Lacks extended VOUT range (0.5V–3.5V only), no internal EEPROM, lower telemetry resolution (12-bit ADC), and no AEC-Q100 option. | Suitable for cost-sensitive, non-automotive applications where digital configurability is secondary to basic dual-output control. | Select LTC3880 if EEPROM storage, 16-bit telemetry, or automotive qualification are not required - reduces BOM cost by ~18%. |
| TPS53689RTAT | TI part with PMBus v1.3, 12-bit telemetry, no internal EEPROM, 4.5V–18V VIN, and fixed 0.5V–3.3V VOUT range; lacks remote differential sensing. | Targeted at mid-range server and networking applications where TI ecosystem integration (Fusion Digital Power Designer) is preferred. | Choose TPS53689 for TI-centric designs needing fast evaluation; avoid where ±0.5% accuracy, remote sensing, or EEPROM persistence are mandatory. |
Compared with LTC3880IUJ#PBF and TPS53689RTAT, the LTC3887EUJ#PBF delivers superior accuracy (±0.5% vs. ±0.75%), wider VOUT range (0.5V–5.5V), on-chip EEPROM with ECC, and AEC-Q100 qualification - making it the only option for high-precision, field-updatable, automotive-grade dual-output power management.
Availability
LTC3887EUJ#PBF is available at Aetrix Electronics and suitable for high-current server VRMs, telecom line cards, and automotive ADAS ECUs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887EUJ#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. following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC3887EUJ#PBF belongs to the LTC® digital power controller family, designed specifically for intelligent, telemetry-enabled, multi-phase DC/DC conversion in mission-critical infrastructure and automotive systems.
FAQ
What is the maximum number of phases supported by the LTC3887EUJ#PBF?
The LTC3887EUJ#PBF supports up to six interleaved phases through its SHARE_CLK pin and phase synchronization logic. This enables precise current sharing across multiple LTC3887EUJ#PBF devices or compatible controllers in high-current applications such as CPU VRMs, where total output exceeds 100A. Phase offsets are programmable via PMBus or RCONFIG resistors.
Does the LTC3887EUJ#PBF require external components for PMBus communication?
No, the LTC3887EUJ#PBF includes internal pull-up resistors on SCL and SDA lines and supports standard PMBus v1.2 protocol at up to 400kHz. Only external 0.1µF decoupling capacitors on VDD33 and VDD25 are required; no external level shifters or bus buffers are needed for typical 3.3V system interfaces.
How does the LTC3887EUJ#PBF handle prebiased output conditions during startup?
The LTC3887EUJ#PBF supports controlled startup into prebiased outputs via its digital servo mode and programmable soft-start ramp. When RUN pins are asserted, the controller monitors VOUT via VSENSE inputs and gradually increases duty cycle only after confirming the output is below the target - preventing reverse current flow and ensuring safe turn-on without external circuitry.
Can the LTC3887EUJ#PBF operate without connecting the EEPROM write-protect (WP) pin?
Yes - the WP pin has an internal pull-up and defaults to write-protected state when left unconnected or tied high. To enable EEPROM writes (e.g., STORE_USER_ALL), WP must be actively pulled low. This hardware lock prevents accidental corruption of configuration or fault logs during normal operation or firmware updates.
What thermal sensing capabilities does the LTC3887EUJ#PBF provide?
The LTC3887EUJ#PBF integrates an internal die temperature sensor (±1°C TUE) and supports two external NTC thermistors via TSNS0 and TSNS1 pins (±3°C TUE). All three sensors feed the 16-bit ADC, enabling real-time thermal mapping, per-rail derating, and fault-triggered shutdown - critical for maintaining reliability in high-power density applications.
LTC3887EUJ#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)
LTC3887EUJ#PBF FAQ
1.How can I place an order for LTC3887EUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887EUJ#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 LTC3887EUJ#PBF reliable?
The price and inventory of LTC3887EUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887EUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC3887EUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887EUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887EUJ#PBF?
LTC3887EUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887EUJ#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 LTC3887EUJ#PBF?
For technical support, including LTC3887EUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887EUJ#PBF requirements.
6.How does Aetrix verify that LTC3887EUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3887EUJ#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 LTC3887EUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC3887EUJ#PBF?
All LTC3887EUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887EUJ#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 LTC3887EUJ#PBF part is unused and in its original packaging.
Return procedure for LTC3887EUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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