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Analog Devices Inc. LTC3882IUJ#TRPBF
- Part No.:
- LTC3882IUJ#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3882IUJ#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,362
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Product details
Overview
LTC3882IUJ#TRPBF from Analog Devices is a dual-output, PolyPhase synchronous step-down DC/DC voltage mode controller with PMBus-compliant digital power system management. It delivers 0.5V–5.25V outputs per channel, supports up to 8-phase parallel operation, and achieves ±0.5% output voltage accuracy with resistor or DCR current sensing in a 40-pin QFN package. It is used in high-current server VRMs requiring precise telemetry, sequencing, and fault logging.
For engineers reviewing the LTC3882IUJ#TRPBF datasheet, LTC3882IUJ#TRPBF pinout, LTC3882IUJ#TRPBF application, or LTC3882IUJ#TRPBF equivalent, key selection criteria include its dual-channel PMBus-managed control, internal EEPROM with ECC and fault logging, ±0.5% VOUT accuracy, 250kHz–1.25MHz programmable switching frequency, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3882IUJ#TRPBF implements a constant-frequency, leading-edge voltage-mode PWM architecture optimized for fast transient response and tight regulation across dual independent channels. Each channel supports programmable soft-start/stop, AVP, margining, and time- or voltage-based sequencing via internal registers or external resistors.
It integrates dual 16-bit ADCs for real-time telemetry of input/output voltage, current (via ISENSE± or DCR), and temperature (internal diode + two external TSNS inputs), with all data stored or reported through a PMBus/I²C interface compliant with SMBus 3.0 and PMBus 1.3 specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT Range | 0.5V to 5.25V per channel - enables direct regulation of core, I/O, and auxiliary rails in modern processors and FPGAs. |
| Output Voltage Accuracy | ±0.5% - ensures stable CPU/GPU supply under dynamic load without manual calibration. |
| Switching Frequency | 250kHz to 1.25MHz - allows optimization of efficiency vs. size using standard 0.1–1µH inductors. |
| PMBus Compliance | PMBus 1.3 & SMBus 3.0 - enables full telemetry readback and configuration via industry-standard digital interface. |
| Current Sensing | Resistor or inductor DCR - eliminates need for dedicated sense resistors, reducing power loss and BOM cost. |
| EEPROM | Internal with ECC and fault logging - retains configuration and fault history across power cycles without external memory. |
| Operating Temp | –40°C to 125°C - qualified for industrial and automotive under-hood applications per AEC-Q100 Grade 1. |
| Package | 40-pin (6mm × 6mm) QFN with exposed thermal pad - provides low θJC = 2.5°C/W for high-power density designs. |
Pinout & Package
40-pin (6mm × 6mm) plastic QFN package with exposed GND pad (Pin 41), rated for –40°C to 125°C junction temperature and optimized for thermal dissipation in high-current VRM layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main IC supply input | Accepts 7V–13.2V for internal regulators; powers VCC, VDD33, and VDD25 rails. |
| VINSNS | Input voltage sense input | Monitors input rail (3V–38V range) for UV/OV protection and telemetry with 278kΩ input resistance. |
| PWM0 / PWM1 | Gate drive outputs | High-speed, low-propagation-delay outputs driving external N-channel MOSFET gates in synchronous buck topology. |
| ISENSE0+/–, ISENSE1+/– | Differential current sense inputs | Support ±70mV full-scale sensing for accurate IOUT measurement with <±1% TUE at ≥6mV differential. |
| VSENSE0+/–, VSENSE1+/– | Output voltage feedback inputs | High-impedance (≥52kΩ) inputs enabling precision remote sensing with <±0.5% VOUT accuracy. |
| SCL / SDA | PMBus/I²C bidirectional bus | Open-drain interface supporting up to 400kHz clock; includes built-in digital filtering and timeout protection. |
| ALERT | Open-drain fault indicator | Asserts low on any enabled fault (VOUT OV/UV, IOUT OC, OT, timing faults); configurable via SMBALERT_MASK. |
| SHARE_CLK | PolyPhase current-sharing clock | Enables accurate inter-device phase alignment and current balancing when multiple LTC3882s operate in parallel. |
| GPIO0 / GPIO1 | Configurable general-purpose I/O | Programmable as inputs (with 3µs digital filter) or outputs (open-drain); can map specific fault events per MFR_GPIO_PROPAGATE_LTC3882. |
| WP | Write-protect enable | Hardware lock for EEPROM writes; pulled high internally unless externally tied low to allow STORE_USER_ALL or RESTORE_USER_ALL. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM controllers | Each channel fully configurable for voltage, current limit, soft-start, sequencing, and AVP-enabling asymmetric multi-rail systems without external coordination logic. |
| Integrated telemetry ADCs | Simultaneous 16-bit VOUT, 10-bit IOUT, 10-bit VIN, and 0.25°C-resolution temperature measurements eliminate need for external monitoring ICs. |
| Internal EEPROM with ECC | Stores configuration, fault logs, and calibration data with error correction-ensures reliable startup and diagnostics after power loss or reset. |
| PolyPhase® current sharing | Accurate inter-device load balancing across up to 8 phases using SHARE_CLK synchronization-reduces per-phase current stress and improves thermal distribution. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood environments (–40°C to 125°C), including HTOL, ESD, and latch-up testing-supports functional safety-critical power rails. |
| Resistor-programmable parameters | FREQ_CFG, PHAS_CFG, VOUT0_CFG, VOUT1_CFG, and ASELn pins allow key settings (frequency, phase offset, rail ID) to be set at boot without software initialization. |
Applications
| Server CPU Core VRM | Telecom Baseband Power |
|---|---|
Use Scenario: Regulating 0.8V/120A CPU core supply in dual-socket rack servers with dynamic DVFS and AVP requirements. IC Role / Device Role / Timing Role: Dual-channel voltage mode controller managing two interleaved 4-phase buck stages, with real-time current sharing and telemetry fed to BMC via PMBus. Use Value: ±0.5% VOUT accuracy and 90ms telemetry update rate ensure compliance with Intel VRD13/VRD14 specifications while enabling predictive thermal throttling. | Use Scenario: Powering FPGA, DSP, and RF front-end ICs in 5G macro base stations requiring strict sequencing and fault containment. IC Role / Device Role / Timing Role: Dual-output sequencer and supervisor controlling 1.2V FPGA core, 1.8V I/O, and 3.3V analog rails with time-based ramping and voltage-margining for production test. Use Value: Internal EEPROM stores golden configuration and fault logs, enabling field-replaceable module recovery without host intervention or firmware reflash. |
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
Use Scenario: Supplying 1.0V/60A SoC and 1.8V/20A image sensor in autonomous driving compute units operating at 125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 qualified dual controller with internal temperature sensing and external TSNS inputs monitoring heatsink and SoC die temperature. Use Value: Hardware-based OT fault response shuts down PWM within 24µs, preventing thermal runaway without MCU involvement-meeting ISO 26262 ASIL-B timing constraints. | Use Scenario: Providing isolated, monitored 5V/3A and 3.3V/5A supplies for modular I/O expansion in factory automation controllers. IC Role / Device Role / Timing Role: Digital power manager interfacing with PLC backplane via isolated I²C, delivering programmable UV/OV thresholds and current limits per channel. Use Value: Resistor-programmed VOUT_CFG and FREQ_CFG pins enable consistent startup behavior across thousands of identical modules without individual firmware provisioning. |
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 |
|---|---|---|---|
| LTC3883IUJ#TRPBF | Triple-output version with identical pinout, same EEPROM, PMBus, and AEC-Q100 rating; adds third PWM channel and associated sensing pins. | Required where three independent regulated rails (e.g., core, I/O, aux) must be managed with synchronized telemetry and sequencing. | Select LTC3883IUJ#TRPBF only if third output is needed; shares same layout and firmware API but requires PCB redesign for extra pins. |
| TPS53689RTAT | TI dual-output PMBus controller with 0.5V–2.5V VOUT range, no internal EEPROM, lower VOUT accuracy (±0.75%), and no AEC-Q100 qualification. | Suitable for cost-sensitive industrial applications where EEPROM persistence and automotive qualification are not required. | Choose TPS53689RTAT for non-automotive, non-fault-logging use cases; lacks internal fault log storage and fails AEC-Q100 thermal cycling requirements. |
Compared with LTC3883IUJ#TRPBF, the LTC3882IUJ#TRPBF saves board space and cost by omitting the third channel while retaining identical dual-rail performance, EEPROM reliability, and automotive qualification. Against TPS53689RTAT, it offers superior accuracy, integrated fault logging, and guaranteed automotive operation-critical for mission-critical embedded power.
Availability
LTC3882IUJ#TRPBF is available at Aetrix Electronics and suitable for server VRMs, telecom baseband power, automotive ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3882IUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3882IUJ#TRPBF belongs to Analog Devices' Power by Linear™ digital power management product line, designed specifically for high-efficiency, high-reliability, multi-phase DC/DC conversion in datacenter, automotive, and industrial systems demanding real-time telemetry and fault resilience.
FAQ
What is the maximum number of LTC3882IUJ#TRPBF devices that can operate in parallel?
Up to four LTC3882IUJ#TRPBF controllers can operate in parallel to support 2-, 3-, 4-, 6-, or 8-phase configurations. This is achieved using the SHARE_CLK pin for precise phase alignment and the internal PolyPhase® current-sharing algorithm, which maintains ≤±3% current imbalance across phases under steady-state and transient conditions as verified in the LTC3882IUJ#TRPBF datasheet Figure 10.
Does the LTC3882IUJ#TRPBF require external EEPROM for configuration storage?
No, the LTC3882IUJ#TRPBF includes internal EEPROM with ECC and CRC protection, capable of storing configuration, fault logs, and calibration data for up to 10 years at ≤125°C junction temperature. All critical settings-including VOUT_COMMAND, IOUT_OC_FAULT_LIMIT, and sequencing delays-are retained across power cycles without external memory, as specified in the Electrical Characteristics table on page 7 of the LTC3882IUJ#TRPBF datasheet Rev. D.
What current sensing methods does the LTC3882IUJ#TRPBF support?
The LTC3882IUJ#TRPBF supports both discrete resistor-based and inductor DCR-based current sensing on each channel. ISENSE0± and ISENSE1± inputs accept ±70mV differential signals with <±1% total unadjusted error above 6mV, and internal zero-code offset is trimmed to ±32µV. DCR sensing eliminates power loss from sense resistors and is configured via MFR_IOUT_CAL_GAIN_TC register per the LTC3882IUJ#TRPBF PMBus command details on page 80.
Is the LTC3882IUJ#TRPBF pin-compatible with earlier LTC3882 revisions?
Yes, the LTC3882IUJ#TRPBF is pin-compatible with all UJ-package variants of the LTC3882 family, including LTC3882EUJ#TRPBF and LTC3882IUJ#PBF. The 40-pin QFN footprint, pin functions, and electrical characteristics are identical across temperature grades; only the specified operating junction temperature range differs (–40°C to 125°C for 'I' grade vs. 0°C to 85°C for 'E' grade).
How does the LTC3882IUJ#TRPBF handle overtemperature faults?
The LTC3882IUJ#TRPBF responds to overtemperature faults by asserting ALERT and disabling PWM0/PWM1 within 24µs, as defined by TON_MAX_FAULT_RESPONSE timing. It monitors internal junction temperature via an on-die diode and up to two external NTC/PTC sensors on TSNS0/TSNS1 pins. OT_FAULT_LIMIT is programmable from –40°C to 150°C with 0.25°C resolution, and fault logging records timestamped thermal events in internal EEPROM per the MFR_FAULT_LOG command on page 99 of the LTC3882IUJ#TRPBF datasheet.
LTC3882IUJ#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:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 13.8V
- Frequency - Switching:
- 500kHz
- Duty Cycle (Max):
- 87.5%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus
- Control Features:
- Enable, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3882IUJ#TRPBF FAQ
1.How can I place an order for LTC3882IUJ#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3882IUJ#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 LTC3882IUJ#TRPBF reliable?
The price and inventory of LTC3882IUJ#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3882IUJ#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3882IUJ#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3882IUJ#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3882IUJ#TRPBF?
LTC3882IUJ#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3882IUJ#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 LTC3882IUJ#TRPBF?
For technical support, including LTC3882IUJ#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3882IUJ#TRPBF requirements.
6.How does Aetrix verify that LTC3882IUJ#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3882IUJ#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 LTC3882IUJ#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3882IUJ#TRPBF?
All LTC3882IUJ#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3882IUJ#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 LTC3882IUJ#TRPBF part is unused and in its original packaging.
Return procedure for LTC3882IUJ#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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