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Analog Devices Inc. LTC3887IUJ-2#TRPBF
- Part No.:
- LTC3887IUJ-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887IUJ-2#TRPBF.pdf
- Description:
- DUAL OUTPUT POLYPHASE STEP-DOWN
- Quantity:
- Payment:
- Shipping:
Inventory:4,244
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Product details
Overview
LTC3887IUJ-2#TRPBF from Analog Devices is a dual-channel, current-mode DC/DC controller with digital power system management (PSM) via PMBus/SMBus/I²C interface. It supports 0.5V to 5.5V output per channel, 4.5V to 24V input, ±0.5% VOUT accuracy, and manages point-of-load supplies in high-density server and telecom power systems.
For engineers reviewing the LTC3887IUJ-2#TRPBF datasheet, LTC3887IUJ-2#TRPBF pinout, LTC3887IUJ-2#TRPBF application, or LTC3887IUJ-2#TRPBF equivalent, key selection criteria include dual-phase current-mode control, inferred input current sensing, integrated temperature monitoring with ΔVBE and direct sensing, and support for autonomous sequencing and fault logging without host firmware.
Technical Context
The LTC3887IUJ-2#TRPBF implements two independent current-mode PWM controllers with digitally programmable loop parameters, real-time telemetry readback (VIN, VOUT, IOUT, POUT, temperature), and EEPROM-based configuration storage. It supports fast ADC mode for high-resolution voltage/current sampling and coordinates multi-rail sequencing across cascaded PSM devices.
It features inferred input current sensing, ultralow DCR sensing capability, three-state PWM control for phase shedding, and on-chip LDOs derived from VIN. The device operates with no external software coding required and integrates black-box fault logging compliant with PMBus standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 24V - supports standard intermediate bus voltages including 5V, 12V, and 19V inputs |
| VOUT Range | 0.5V to 5.5V per channel - enables precise regulation of core, I/O, and auxiliary rails in FPGA/ASIC systems |
| VOUT Accuracy | ±0.5% - ensures tight tolerance for sensitive digital loads requiring stable supply margins |
| Max IOUT | 30A per phase - scalable output current via external MOSFET selection and layout optimization |
| Control Mode | Current-mode PWM - provides inherent cycle-by-cycle current limiting and improved transient response |
| Digital Interface | PMBus v1.3 over I²C/SMBus - enables full telemetry, configuration, and fault management without custom firmware |
| Temp Sensing | ΔVBE and direct sensing - supports accurate die and remote temperature monitoring for thermal derating |
Pinout & Package
The LTC3887IUJ-2#TRPBF is housed in a 6 mm × 6 mm QFN-40 package with exposed thermal pad (UJ suffix), optimized for high-power density and thermal performance in multilayer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD1, PGOOD2 | Power-good status outputs | Open-drain signals indicating regulated output stability per channel; used for sequencing handshaking |
| CLKIN, CLKOUT | Phase synchronization terminals | Enable interleaved operation with external clock source or master-slave timing coordination |
| SCL, SDA | PMBus serial interface | Two-wire bidirectional bus for configuration, telemetry readback, and fault logging |
| ITH1, ITH2 | Current limit threshold inputs | Analog pins setting peak inductor current per channel via resistor divider; supports programmable ILIM |
| VC1, VC2 | Output voltage feedback compensation | Connect to error amplifier output for external compensation network tuning of each control loop |
| TEMP | Temperature sensor input | Accepts ΔVBE signal from external NPN transistor or internal diode for thermal monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode controllers | Enables synchronous two-phase or dual-rail operation with separate loop tuning and fault isolation |
| EEPROM-based configuration storage | Persists register settings across power cycles; eliminates boot-time host initialization overhead |
| Autonomous sequencing and margining | Programmable start-up delays, voltage trim offsets, and rail enable/disable logic without CPU involvement |
| Black-box fault logging | Records timestamped fault events (OV, UV, OC, OT) with telemetry snapshots for root-cause analysis |
| Three-state PWM control | Supports phase shedding during light load to improve efficiency without changing switching frequency |
Applications
| High-Density Server VRMs | Telecom Line Cards |
|---|---|
|
Use Scenario: Regulating multiple low-voltage, high-current rails (e.g., 0.8V/30A core, 1.2V/20A I/O) on compact line cards with strict thermal constraints. IC Role / Device Role / Timing Role: Dual-channel DC/DC controller managing independent POL supplies with synchronized phase interleaving and real-time telemetry. Use Value: ±0.5% VOUT accuracy and inferred current sensing reduce component count while enabling dynamic margining for ASIC voltage validation. |
Use Scenario: Powering DSP/FPGA subsystems in carrier-grade base stations requiring coordinated startup, fault containment, and field-upgradable configurations. IC Role / Device Role / Timing Role: Digital power manager executing pre-programmed sequencing, voltage trimming, and black-box logging over PMBus. Use Value: Autonomous operation eliminates host processor dependency; EEPROM persistence ensures consistent behavior after hot-swap or reset. |
| Industrial PLC Backplanes | Test & Measurement Equipment |
|
Use Scenario: Delivering tightly regulated 3.3V, 5V, and 12V rails to mixed-signal modules in ruggedized automation controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Dual-output controller with direct and ΔVBE temperature sensing for thermal derating and reliability monitoring. Use Value: Integrated temperature sensing and ±0.5% accuracy ensure stable operation across –40°C to +105°C junction temperatures without external sensors. |
Use Scenario: Calibratable power supplies in bench instruments where output voltage must be trimmed/margined during production test and field calibration. IC Role / Device Role / Timing Role: Digitally programmable controller supporting fine-grained VOUT adjustment (1mV steps) and precision current measurement. Use Value: PMBus-based margining commands allow automated test sequences to verify supply compliance without hardware rework. |
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 |
|---|---|---|---|
| LTC3882IUJ#TRPBF | Same 6×6 QFN-40 package; supports 0.5V–5.3V VOUT but lacks direct temperature sensing and uses inferred input current sensing only | Lower-cost option for applications not requiring dual temperature sensing or black-box fault logging | Select when thermal monitoring is limited to die temperature only and EEPROM fault history is unnecessary |
| LTC3884IUJ#TRPBF | Wider VIN range (4.5V–38V); adds dedicated PGOOD pins and supports higher output voltage (up to 13.2V) | Suitable for industrial and automotive intermediate bus applications requiring >24V input or >5.5V output | Choose when input voltage exceeds 24V or output must exceed 5.5V; retains same digital management features |
Compared with LTC3882IUJ#TRPBF and LTC3884IUJ#TRPBF, the LTC3887IUJ-2#TRPBF uniquely combines dual ΔVBE/direct temperature sensing, autonomous sequencing, and black-box logging in a 24V-input, 5.5V-output dual-controller platform-making it optimal for high-reliability telecom and server POL systems requiring comprehensive telemetry and fault diagnostics.
Availability
LTC3887IUJ-2#TRPBF is available at Aetrix Electronics and suitable for high-density server VRMs, telecom line cards, industrial PLC backplanes, and test & measurement equipment requiring stable component supply and long-term design-in support.
Supply support for LTC3887IUJ-2#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, headquartered in Norwood, MA.
The LTC3887IUJ-2#TRPBF belongs to Analog Devices' Power System Management (PSM) product line, designed specifically for digitally controlled, telemetry-enabled point-of-load power conversion in datacenter, communications, and industrial infrastructure.
FAQ
What is the primary function of the LTC3887IUJ-2#TRPBF?
The LTC3887IUJ-2#TRPBF is a dual-channel, current-mode DC/DC controller with integrated digital power system management. It regulates two independent output rails, provides real-time telemetry (voltage, current, temperature, power), and supports autonomous sequencing, margining, and fault logging via PMBus. Its design enables robust, software-defined power delivery in high-reliability systems without host processor intervention.
Does the LTC3887IUJ-2#TRPBF require external firmware to operate?
No, the LTC3887IUJ-2#TRPBF operates autonomously using configuration stored in on-chip EEPROM. Once programmed-via LTpowerPlay and DC1613 adapter or JTAG-the LTC3887IUJ-2#TRPBF executes sequencing, supervision, and telemetry functions independently. Host interaction is optional for dynamic reconfiguration or data readback, not required for basic operation.
What temperature sensing methods does the LTC3887IUJ-2#TRPBF support?
The LTC3887IUJ-2#TRPBF supports both ΔVBE sensing (using an external NPN transistor or integrated die diode) and direct temperature sensing via the TEMP pin. This dual-method capability allows simultaneous monitoring of IC junction temperature and remote board hotspots, enabling precise thermal derating and fault detection in the LTC3887IUJ-2#TRPBF-based power system.
Can the LTC3887IUJ-2#TRPBF be used in single-rail applications?
Yes, the LTC3887IUJ-2#TRPBF can configure one channel for primary regulation while disabling or repurposing the second. Its dual-channel architecture supports flexible deployment-including single high-current rail (up to 30A/phase with appropriate MOSFETs) or two independent lower-current rails. All digital management features remain fully functional in either configuration.
How is the LTC3887IUJ-2#TRPBF programmed and configured?
The LTC3887IUJ-2#TRPBF is configured using Analog Devices' free LTpowerPlay GUI with a DC1613 USB-to-PMBus adapter. Users define VOUT, sequencing delays, fault thresholds, and loop compensation; settings are saved to on-chip EEPROM. In-circuit programming is supported via board-mounted PMBus headers or JTAG, allowing field updates and configuration validation without removing the LTC3887IUJ-2#TRPBF from the PCB.
LTC3887IUJ-2#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 ~ 34V
- 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-2#TRPBF FAQ
1.How can I place an order for LTC3887IUJ-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887IUJ-2#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-2#TRPBF reliable?
The price and inventory of LTC3887IUJ-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3887IUJ-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887IUJ-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887IUJ-2#TRPBF?
LTC3887IUJ-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887IUJ-2#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-2#TRPBF?
For technical support, including LTC3887IUJ-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887IUJ-2#TRPBF requirements.
6.How does Aetrix verify that LTC3887IUJ-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3887IUJ-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3887IUJ-2#TRPBF?
All LTC3887IUJ-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887IUJ-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3887IUJ-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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