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Analog Devices Inc. LTC3887EUJ
- Part No.:
- LTC3887EUJ
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887EUJ.pdf
- Description:
- IC POWER MANAGEMENT
- Quantity:
- Payment:
- Shipping:
Inventory:1,084
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Product details
Overview
LTC3887EUJ from Analog Devices is a dual-channel, current-mode synchronous step-down DC/DC controller with digital power system management (PSM) via PMBus/SMBus/I2C interface. It supports 0.5V to 5.5V output voltage per channel, 4.5V to 24V input range, ±0.5% VOUT accuracy, and up to 30A per phase with external MOSFETs-used in high-density server and telecom POL supplies requiring precise telemetry and sequencing.
For engineers reviewing the LTC3887EUJ datasheet, LTC3887EUJ pinout, LTC3887EUJ application, or LTC3887EUJ equivalent, key selection criteria include its dual-phase current-mode control, integrated EEPROM for fault logging, real-time telemetry (VIN, VOUT, IOUT, temperature), and autonomous sequencing without host firmware.
Technical Context
The LTC3887EUJ implements a fast analog feedback loop with digital supervision-each channel uses independent current-mode PWM control with programmable loop compensation via external RC network. It supports three-state PWM for phase shedding and integrates a 10-bit ADC for voltage, current, and temperature monitoring with fast ADC mode disabled by default.
PMBus v1.3 compliance enables full configuration of trim, margin, OV/UV thresholds, soft-start ramp rate, and sequencing delays. Fault management includes overvoltage, undervoltage, overcurrent, and thermal shutdown with black-box EEPROM logging and dedicated FAULT pin assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 24V - supports standard 5V, 12V intermediate bus architectures with headroom for ripple and drop. |
| VOUT Range | 0.5V to 5.5V per channel - covers core, I/O, and auxiliary rails including DDR4, ASIC, and FPGA supplies. |
| VOUT Accuracy | ±0.5% over line/load/temp - ensures stable operation of sensitive digital loads without manual calibration. |
| Max Output Current | 30A per phase - scalable to higher currents using external high-side/low-side MOSFETs and gate drivers. |
| Digital Interface | PMBus v1.3 over I2C/SMBus - enables standardized telemetry readback and configuration without proprietary software. |
| EEPROM | On-chip nonvolatile memory - stores user-defined configuration and fault logs for post-failure analysis and field diagnostics. |
| Temp Sensing | ΔVBE + direct NTC support - provides accurate die and remote temperature monitoring for thermal derating and fan control. |
Pinout & Package
Package: 6 mm × 6 mm QFN-40 with exposed pad (EPAD); RoHS-compliant, thermally enhanced for high-current POL applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1, PGOOD2 | Open-drain power-good status | Asserted low when respective VOUT is within ±7.5% regulation window-enables rail-to-rail sequencing and fault isolation. |
| CLK, SDA, SCL | PMBus interface signals | Support hot-plug capable SMBus communication at up to 400 kHz; SCL/SDA pulled up externally per PMBus spec. |
| ITH1, ITH2 | Error amplifier compensation nodes | Accept external RC networks to set bandwidth, phase margin, and transient response per channel independently. |
| IMON1, IMON2 | Analog current sense inputs | Accept DCR or resistor-based current sensing; enable accurate real-time IOUT telemetry and OCP protection. |
| TRK1, TRK2 | Tracking input pins | Support supply tracking during startup/shutdown via external resistor divider or master-slave cascading with LTC3870. |
| EN1, EN2 | Channel enable inputs | Active-high logic enables independent channel power-up control and sequencing delay programming via PMBus. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode controllers | Enables asymmetric phase design and per-rail optimization-no shared timing or compensation constraints between channels. |
| Three-state PWM control | Allows seamless phase shedding under light load to maintain high efficiency across 1–100% load range. |
| Integrated 10-bit ADC with telemetry | Reads VIN, VOUT, IOUT, temperature, duty cycle, and faults without external converters-reduces BOM count and layout complexity. |
| Autonomous sequencing with EEPROM | Stores multi-rail startup/shutdown order, delays, and dependencies-eliminates need for external sequencer IC or FPGA logic. |
| PMBus v1.3 compliance | Ensures interoperability with industry-standard power management tools (e.g., LTpowerPlay) and host BMC firmware stacks. |
Applications
| Server CPU Core Supply | Telecom Data Plane Card |
|---|---|
Use Scenario: High-current, dynamically scaled core voltage for x86 or ARM-based server processors with DVFS. IC Role / Device Role / Timing Role: Dual-phase controller managing two independent 0.8V/30A rails with synchronized current sharing and adaptive voltage positioning (AVP). Use Value: ±0.5% VOUT accuracy and real-time IOUT telemetry enable closed-loop AVP control and dynamic power capping per workload. | Use Scenario: Multi-rail power delivery on packet processing line cards with strict sequencing and fault containment. IC Role / Device Role / Timing Role: Primary POL manager coordinating 1.2V, 1.8V, and 3.3V rails with programmable startup delays and fault propagation via FAULT pin. Use Value: Cascadable sequencing and EEPROM-stored fault logs reduce field return root-cause analysis time by >50%. |
| FPGA I/O Bank Supply | Industrial PLC Power Module |
Use Scenario: Configurable I/O voltage for Xilinx or Intel FPGAs supporting multiple interface standards (LVDS, HSTL, SSTL). IC Role / Device Role / Timing Role: Digitally trimmed and margined 1.8V/2.5V rail with margining enabled via PMBus commands during production test. Use Value: On-the-fly VOUT margining eliminates need for external DACs or manual resistor changes-accelerates ATE test coverage. | Use Scenario: Ruggedized 24V-input power module delivering isolated 5V, 12V, and 24V outputs in factory automation systems. IC Role / Device Role / Timing Role: Master controller interfacing with external isolators and supervisors to enforce safety-critical power-up sequence and watchdog timeout. Use Value: Autonomous fault response (e.g., immediate shutdown on overtemperature) meets IEC 61508 SIL-2 functional safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3887IUJ | Same functionality but rated for –40°C to 125°C junction temperature vs. –40°C to 115°C for LTC3887EUJ. | Suitable for extended-temperature industrial or automotive under-hood environments where ambient exceeds 85°C. | Select LTC3887IUJ when operating junction temperature must exceed 115°C; otherwise LTC3887EUJ is optimal for commercial/enterprise applications. |
| LTC3886IUJ | Supports wider VIN (4.5V to 60V), higher VOUT (up to 13.2V), but lacks three-state PWM and has no direct NTC support. | Targeted at industrial 24V/48V bus systems requiring higher output voltage and input surge tolerance-not optimized for low-VOUT, high-current server rails. | Choose LTC3886IUJ only when input exceeds 24V or VOUT > 5.5V is required; LTC3887EUJ remains superior for sub-6V POL with telemetry depth. |
Compared with LTC3887IUJ and LTC3886IUJ, the LTC3887EUJ delivers best-in-class telemetry fidelity and phase-shedding efficiency for 12V-input server and networking POLs-while offering lower cost and smaller footprint than the extended-temp or wide-input alternatives.
Availability
LTC3887EUJ is available at Aetrix Electronics and suitable for server motherboard design, telecom line card development, and FPGA-based embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3887EUJ 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, headquartered in Norwood, MA.
The LTC3887EUJ belongs to Analog Devices' Digital Power System Management (PSM) product line-designed specifically for intelligent, self-monitoring point-of-load power supplies in datacenter, networking, and high-reliability industrial systems.
FAQ
What is the maximum supported input voltage for the LTC3887EUJ?
The LTC3887EUJ supports an input voltage range from 4.5V to 24V. This range is optimized for standard intermediate bus voltages used in enterprise servers and telecom equipment. Operation above 24V is not supported and may damage the device. The LTC3887EUJ datasheet specifies absolute maximum VIN as 26V, but recommended operating conditions cap continuous operation at 24V for reliability.
Does the LTC3887EUJ require external components for current sensing?
Yes, the LTC3887EUJ requires external components for current sensing-it supports both DCR sensing (using series inductor resistance) and resistor-based sensing via IMON1/IMON2 pins. No internal current sense amplifier is included; external RC networks and sense resistors must be selected per application load and accuracy requirements. The LTC3887EUJ does not integrate MOSFET drivers or sense elements.
Can the LTC3887EUJ operate without a PMBus host controller?
Yes, the LTC3887EUJ can operate autonomously without a PMBus host controller. Its on-chip EEPROM stores default or user-programmed configurations-including VOUT, switching frequency, and sequencing parameters-allowing full analog operation after power-up. PMBus is optional for configuration, telemetry, and dynamic adjustment; it is not required for basic regulation.
What package type and thermal characteristics does the LTC3887EUJ use?
The LTC3887EUJ uses a 6 mm × 6 mm QFN-40 package with exposed thermal pad (EPAD). Its θJA is 30°C/W on a 4-layer JEDEC board, and θJC is 2.5°C/W. The EPAD must be soldered to a solid copper thermal plane for reliable operation at full 30A/phase. Thermal performance directly impacts maximum sustained output current and fault threshold margins.
Is the LTC3887EUJ pin-compatible with other members of the LTC388x family?
No, the LTC3887EUJ is not pin-compatible with other LTC388x devices such as LTC3882 or LTC3884. While all share the QFN-40 footprint, pin functions differ significantly-for example, LTC3882 uses different compensation and current sense topologies, and LTC3884 features distinct sequencing and bias supply pins. PCB layout must be designed specifically for the LTC3887EUJ pinout.
LTC3887EUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PolyPhase®
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC3887EUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887EUJ 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 reliable?
The price and inventory of LTC3887EUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887EUJ is usually 5 days.
3.What payment methods are accepted for LTC3887EUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887EUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887EUJ?
LTC3887EUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887EUJ 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?
For technical support, including LTC3887EUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887EUJ requirements.
6.How does Aetrix verify that LTC3887EUJ is sourced from the original manufacturer or authorized distributors?
All LTC3887EUJ 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 meets industry standards.
7.What is the process for return or replacement of LTC3887EUJ?
All LTC3887EUJ units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887EUJ, 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 part is unused and in its original packaging.
Return procedure for LTC3887EUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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