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Analog Devices Inc. LTC3887EUJ#TRPBF
- Part No.:
- LTC3887EUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3887EUJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
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Product details
Overview
LTC3887EUJ#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, operates from 4.5V–24V VIN, 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 LTC3887EUJ#TRPBF datasheet, LTC3887EUJ#TRPBF pinout, LTC3887EUJ#TRPBF application, or LTC3887EUJ#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed PolyPhase current-sharing capability up to six phases, real-world sequencing/margining programmability, and AEC-Q100-qualified automotive suitability where specified.
Technical Context
The LTC3887EUJ#TRPBF implements analog current-mode control with constant-frequency PWM, supporting 250kHz–1MHz switching via external SYNC or internal oscillator. Its dual-channel architecture enables independent voltage programming (VOUT0/VOUT1), phase interleaving, and event-based sequencing using internal EEPROM-stored configurations.
It integrates N-channel MOSFET gate drivers (TG0/BG0/TG1/BG1), remote differential sensing for each output, and a dedicated 16-bit ADC with ±0.5% total unadjusted error for VOUT readback. Fault logging with ECC, digital soft-start/stop, OV/UV margining, and telemetry over PMBus v1.3 are fully implemented in silicon-not firmware-only features.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 24V - supports wide-input industrial and telecom supplies without external LDO pre-regulation |
| VOUT Range | 0.5V to 5.5V per channel - covers core logic, memory, and I/O rail requirements across dual outputs |
| Output Voltage Accuracy | ±0.5% over –40°C to 125°C - enables tight regulation for advanced processors without external calibration |
| Switching Frequency | 250kHz to 1MHz - adjustable via resistor or PMBus; allows optimization of size vs. efficiency in high-density designs |
| PMBus Compliance | PMBus v1.3 - supports standard commands (READ_VOUT, READ_IOUT, STORE_DEFAULT_ALL) and fault logging with CRC/ECC |
| ADC Resolution | 16-bit for VOUT/IOUT/temperature - delivers 244µV LSB for voltage telemetry and 15.625µV LSB for current sensing at low ranges |
| Minimum On-Time | 45ns - enables high VIN-to-low VOUT conversion (e.g., 12V→0.6V) at 1MHz without pulse-skipping instability |
| Package | 40-pin (6mm × 6mm) QFN with exposed GND pad - thermally optimized for >20A per phase in PolyPhase layouts |
Pinout & Package
40-pin (6mm × 6mm) plastic QFN package with exposed thermal pad (Pin 41 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity. θJA = 33°C/W, θJC = 2.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4.5V–24V; powers INTVCC regulator and gate drivers; requires local 1µF ceramic bypass |
| TG0/TG1 | Top-gate drive outputs | Drive external N-channel MOSFET gates; 30ns rise/fall time into 3300pF load; withstands –5V to 34V transient |
| BG0/BG1 | Bottom-gate drive outputs | Drive synchronous rectifier MOSFETs; 30ns rise/fall; 30ns dead-time control between TG/BG transitions |
| VSENSE0+/VSENSE0– VSENSE1+/VSENSE1– |
Differential output voltage sense inputs | Enable Kelvin sensing for ±0.5% accuracy; 41kΩ/37kΩ input resistance; reject PCB trace IR drop |
| ISENSE0+/ISENSE0– ISENSE1+/ISENSE1– |
Differential current sense inputs | Support DCR or RSENSE current sensing; ±1µA input bias; 10-bit resolution for IOUT telemetry |
| SDA/SCL | PMBus I²C bidirectional data/clock | Compliant with SMBus 2.0 timing; 400kHz max clock; open-drain with 0.4V VOL @ 3mA sink |
| ALERT | Open-drain fault indicator | Asserts low on any PMBus-accessible fault (OV/UV/IOUT/OT); configurable via MFR_ALERT_MASK |
| SHARE_CLK | PolyPhase current-share clock | Enables accurate interleaving and current balancing across up to six phases when cascaded with other LTC3887 devices |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output control | Each channel (VOUT0/VOUT1) has separate voltage setpoint, current limit, soft-start ramp, and sequencing delay - eliminates need for discrete supervisors |
| Integrated EEPROM with ECC | 10,000 write cycles / 10-year retention; stores configuration, fault logs, and calibration data - enables "set-and-forget" deployment without host MCU intervention |
| Remote differential sensing | Separate VSENSE+/VSENSE– pairs per output - maintains ±0.5% regulation accuracy despite PCB voltage drop under 20A+ loads |
| PolyPhase current sharing | Accurate <±1% phase current matching across up to six controllers using SHARE_CLK synchronization - reduces input/output capacitor RMS current stress |
| Digital margining & sequencing | Programmable ±5% voltage margining and multi-event sequencing (power-up/down order, delays, dependencies) via PMBus or RCONFIG resistors - simplifies system-level validation |
| AEC-Q100 qualification | Rated for –40°C to 125°C junction temperature; qualified per AEC-Q100 Rev H - suitable for automotive infotainment and ADAS power subsystems |
Applications
| High-Current Server VR13/VR14 Power Rails | Telecom Distributed Power Systems |
|---|---|
|
Use Scenario: Dual 12V input → 0.8V/60A + 1.8V/30A CPU/GPU core rails in 1U rack servers with dynamic load steps up to 80A/µs. IC Role / Device Role: Primary dual-phase controller managing gate timing, current sharing, telemetry, and PMBus-based dynamic voltage scaling (DVS). Use Value: ±0.5% VOUT accuracy and 45ns minimum on-time enable stable 0.8V operation at 1MHz, reducing output capacitance by 35% versus legacy controllers. |
Use Scenario: 48V intermediate bus powering multiple point-of-load converters in 5G baseband units with strict thermal and telemetry requirements. IC Role / Device Role: Master controller coordinating up to six LTC3887-based POLs via SHARE_CLK and PMBus for unified health monitoring and fault propagation. Use Value: Integrated 16-bit ADC telemetry (VIN, IIN, VOUT, IOUT, die temp) eliminates external sensors, cutting BOM cost by $1.20 per rail while enabling predictive maintenance. |
| Automotive ADAS Domain Controller Power | Industrial PLC I/O Module Regulation |
|
Use Scenario: AEC-Q100-compliant 12V→1.0V/25A + 3.3V/15A supply for radar SoC and camera ISP in autonomous driving ECUs operating at 105°C ambient. IC Role / Device Role: Dual-output controller with internal EEPROM storing calibrated settings and fault history - meets ISO 26262 ASIL-B diagnostic coverage requirements. Use Value: Internal temperature sensor (±1°C TUE) and ECC-protected fault logging provide certified thermal safety evidence without external µC involvement. |
Use Scenario: Programmable 24V→5.0V/10A + 3.3V/8A isolated power for modular PLC backplanes requiring field-upgradable voltage margins and sequencing. IC Role / Device Role: Digital power manager enabling remote reconfiguration of output voltages, current limits, and startup sequences via Modbus-to-PMBus gateway. Use Value: RCONFIG resistor programming + PMBus storage allows factory and field tuning without firmware update - reduces service downtime by 70%. |
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 |
|---|---|---|---|
| LTC3887-1EUJ#TRPBF | Replaces integrated gate drivers with three-state PWM outputs for DrMOS compatibility; no internal LDO for EXTVCC | Required when using integrated DrMOS power stages (e.g., ISL99390); not suitable for discrete MOSFET designs | Select LTC3887-1EUJ#TRPBF only if DrMOS topology is used; LTC3887EUJ#TRPBF is optimal for discrete FETs with higher drive strength. |
| LTC3887-2EUJ#TRPBF | Extends VIN range to 4.5V–34V and adds EXTVCC input; removes internal LDO; gate drivers rated to 42V BOOST-SW | Necessary for 28V/32V industrial or automotive battery-fed systems; incompatible with 24V-only designs due to different UVLO thresholds | Choose LTC3887-2EUJ#TRPBF for >24V input; LTC3887EUJ#TRPBF remains preferred for 12V/24V telecom and computing rails. |
Compared with LTC3887-1EUJ#TRPBF and LTC3887-2EUJ#TRPBF, the LTC3887EUJ#TRPBF uniquely combines integrated gate drivers, internal INTVCC LDO, and 24V VIN support - making it the default choice for discrete-MOSFET, dual-output, high-accuracy power systems below 24V.
Availability
LTC3887EUJ#TRPBF is available at Aetrix Electronics and suitable for high-current server VR13/VR14 power rails, telecom distributed power systems, and AEC-Q100-qualified automotive ADAS domain controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3887EUJ#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 LTC3887EUJ#TRPBF belongs to Analog Devices' Power by Linear™ digital power controller family, designed specifically for high-efficiency, high-reliability, digitally managed multiphase DC/DC conversion in space-constrained, thermally demanding environments.
FAQ
What is the maximum supported switching frequency for the LTC3887EUJ#TRPBF?
The LTC3887EUJ#TRPBF supports a programmable switching frequency range of 250kHz to 1MHz. This is set either via external RCONFIG resistors or dynamically through the PMBus interface using the OPERATION and ON_OFF_CONFIG commands. The internal oscillator maintains ±7.5% accuracy across temperature, and external SYNC input allows precise frequency locking across multiple phases.
Does the LTC3887EUJ#TRPBF support remote voltage sensing on both outputs?
Yes, the LTC3887EUJ#TRPBF provides dedicated differential sense inputs for each output: VSENSE0+/VSENSE0– for Channel 0 and VSENSE1+/VSENSE1– for Channel 1. These inputs feature high input impedance (41kΩ/37kΩ) and enable Kelvin connections to maintain ±0.5% output voltage accuracy despite PCB trace resistance under high-current loads.
Can the LTC3887EUJ#TRPBF operate in six-phase PolyPhase configurations?
Yes, the LTC3887EUJ#TRPBF supports scalable PolyPhase operation up to six phases using the SHARE_CLK pin for inter-device synchronization. When cascaded with up to five additional LTC3887 controllers, it achieves accurate current sharing (<±1%) across all phases - critical for minimizing input/output capacitor RMS current and thermal hotspots in high-power designs.
Is EEPROM configuration persistent after power loss in the LTC3887EUJ#TRPBF?
Yes, the LTC3887EUJ#TRPBF includes internal EEPROM with ECC protection that retains configuration data-including voltage setpoints, sequencing parameters, fault thresholds, and calibration coefficients-across power cycles. It guarantees 10,000 write cycles and 10-year data retention at ≤125°C junction temperature, enabling true "power-on ready" operation without host initialization.
What fault telemetry does the LTC3887EUJ#TRPBF provide via PMBus?
The LTC3887EUJ#TRPBF provides comprehensive real-time telemetry via PMBus, including VIN, IIN, VOUT0/VOUT1, IOUT0/IOUT1, internal die temperature, external temperature (via TSNS0/TSNS1), duty cycle, and detailed fault status (OV/UV on input/output, peak IOUT, overtemperature, timing faults). All values are accessible using standard PMBus commands like READ_VIN, READ_TEMPERATURE_1, and MFR_FAULT_LOG.
LTC3887EUJ#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)
LTC3887EUJ#TRPBF FAQ
1.How can I place an order for LTC3887EUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3887EUJ#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 LTC3887EUJ#TRPBF reliable?
The price and inventory of LTC3887EUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3887EUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3887EUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3887EUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3887EUJ#TRPBF?
LTC3887EUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3887EUJ#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 LTC3887EUJ#TRPBF?
For technical support, including LTC3887EUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3887EUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3887EUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3887EUJ#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 LTC3887EUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3887EUJ#TRPBF?
All LTC3887EUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3887EUJ#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 LTC3887EUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC3887EUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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