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Analog Devices Inc. LTC3882IUJ#PBF
- Part No.:
- LTC3882IUJ#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3882IUJ#PBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LTC3882IUJ#PBF 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 inductor DCR current sensing-used in high-current server VRMs and telecom power systems.
For engineers reviewing the LTC3882IUJ#PBF datasheet, LTC3882IUJ#PBF pinout, LTC3882IUJ#PBF application, or LTC3882IUJ#PBF equivalent, key selection criteria include its 40-pin QFN package, 250kHz–1.25MHz programmable switching frequency, internal EEPROM with fault logging and ECC, AEC-Q100 qualification, and support for AVP, sequencing, margining, and real-time telemetry via PMBus/I²C.
Technical Context
The LTC3882IUJ#PBF implements a constant-frequency, leading-edge voltage-mode PWM architecture with two independent control loops, each supporting programmable soft-start, ramping, and time- or voltage-based sequencing. Its digital interface enables full configuration of output voltage, current limits, UV/OV thresholds, and phase alignment.
It integrates dual 16-bit ADCs for VOUT, IOUT, VIN, and temperature telemetry; supports both resistor and DCR current sensing; and features hardware-fault response (e.g., immediate PWM shutdown on overcurrent or overtemperature) alongside configurable GPIO mapping for status propagation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.5V to 5.25V per channel - supports core logic, memory, and ASIC rails in modern computing platforms. |
| Output Voltage Accuracy | ±0.5% - ensures tight regulation critical for low-voltage, high-current loads like CPUs and FPGAs. |
| Switching Frequency | 250kHz to 1.25MHz - adjustable via resistor or external clock; enables optimization of efficiency vs. size for different inductor/capacitor selections. |
| Current Sensing | Resistor or inductor DCR - eliminates sense resistor losses while maintaining accurate load monitoring across wide dynamic range. |
| Digital Interface | PMBus v1.3 compliant - enables bidirectional telemetry, configuration storage in internal EEPROM, and fault logging with ECC protection. |
| Operating Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for automotive under-hood and industrial harsh-environment applications. |
| Package | 40-pin (6mm × 6mm) QFN with exposed pad - provides low thermal resistance (θJC = 2.5°C/W) and compact footprint for dense PCB layouts. |
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 θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | IC supply input | Accepts 7V–13.2V for internal regulators; powers VCC, VDD33, and VDD25 rails. |
| VINSNS | Input voltage sense | Monitors input rail (3V–38V range) for UV/OV fault detection and telemetry. |
| PWM0 / PWM1 | Gate drive outputs | High-speed, current-limited PWM signals driving external high-side MOSFETs or DrMOS devices. |
| ISENSE0+/– / ISENSE1+/– | Current sense differential inputs | Supports precision current measurement using either discrete shunt resistors or inductor DCR. |
| VSENSE0+/– / VSENSE1+/– | Output voltage sense differential inputs | Enables Kelvin sensing for accurate remote feedback, rejecting PCB trace IR drop. |
| SCL / SDA | PMBus/I²C interface | Standard open-drain bus lines for configuration, telemetry readback, and fault reporting. |
| ALERT | Open-drain fault indicator | Asserts low on any enabled fault condition; can be mapped to specific GPIOs via register configuration. |
| SHARE_CLK | PolyPhase synchronization | Enables precise phase interleaving across multiple LTC3882 units for ripple cancellation and current sharing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage mode controllers | Each channel fully configurable for output voltage, current limit, soft-start, and sequencing-enabling asymmetric multi-rail designs. |
| Internal EEPROM with ECC and fault logging | Stores configuration, calibration data, and fault history with error correction; survives >10,000 write cycles and retains data ≥10 years at ≤125°C. |
| Hardware-based fault response | Hardwired PWM disable on overvoltage, overcurrent, overtemperature, or timing faults-bypasses firmware delay for sub-microsecond protection. |
| Active Voltage Positioning (AVP) | Programmable droop curve (±118mV max deviation) to reduce output capacitance requirements while maintaining transient compliance. |
| Flexible current sensing | Configurable gain and offset compensation for both shunt and DCR sensing paths-supports high-accuracy, low-loss current monitoring. |
Applications
| Server VRM | Telecom Power Shelf |
|---|---|
Use Scenario: Regulating 1V/80A CPU core voltage in dual-socket rack servers with strict transient response and telemetry requirements. IC Role / Device Role / Timing Role: Dual-channel PolyPhase controller managing eight-phase interleaved buck conversion with real-time current/voltage monitoring. Use Value: ±0.5% voltage accuracy and hardware fault response ensure stable operation during rapid load steps; PMBus telemetry enables predictive maintenance and dynamic power capping. | Use Scenario: Providing isolated, digitally managed 3.3V and 12V rails in carrier-grade telecom line cards with hot-swap and redundancy support. IC Role / Device Role / Timing Role: Dual-output controller coordinating sequencing, margining, and fault reporting across redundant power modules via shared ALERT and SHARE_CLK. Use Value: Internal EEPROM stores golden configurations for fast recovery after firmware update; AEC-Q100 qualification ensures reliability in extended-life telecom infrastructure. |
| Automotive ADAS ECU | Industrial PLC Power Module |
Use Scenario: Supplying 1.8V and 3.3V rails to radar SoCs and image signal processors in autonomous driving ECUs operating under wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-grade dual controller delivering AEC-Q100-compliant power with temperature-compensated current sensing and fault logging. Use Value: On-chip temperature sensors and external TSNS inputs enable closed-loop thermal derating; fault logs aid root-cause analysis during field returns. | Use Scenario: Delivering tightly regulated 5V and 24V auxiliary supplies in programmable logic controllers deployed in factory automation environments with EMI and thermal constraints. IC Role / Device Role / Timing Role: Digitally managed dual-buck controller supporting programmable UV/OV thresholds, soft-start timing, and GPIO-controlled power-up sequencing. Use Value: Resistor-programmable parameters simplify BOM consolidation; PMBus interface allows integration into centralized SCADA power health monitoring. |
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#PBF | Triple-output version with identical feature set, higher pin count (48-pin QFN), and extended VOUT range (0.5V–5.5V). | Required when three independently controlled rails are needed; not pin-compatible with LTC3882IUJ#PBF. | Select LTC3883IUJ#PBF only if third output is required; otherwise, LTC3882IUJ#PBF offers lower cost and smaller footprint. |
| MP8770GQ-Z | Single-output, non-PMBus controller with analog-only interface; lacks EEPROM, telemetry, and AVP; supports 0.6V–5.5V output. | Suitable for cost-sensitive, non-digital power applications where configuration flexibility and fault logging are unnecessary. | Choose MP8770GQ-Z only for simple, fixed-function buck regulation without digital management; LTC3882IUJ#PBF remains necessary for system-level power intelligence. |
Compared with LTC3883IUJ#PBF, the LTC3882IUJ#PBF reduces pin count and board area for dual-rail systems while retaining full digital management capability; versus MP8770GQ-Z, it adds essential telemetry, configurability, and fault resilience required for mission-critical infrastructure.
Availability
LTC3882IUJ#PBF is available at Aetrix Electronics and suitable for high-current distributed power systems, server VRMs, and automotive ADAS ECUs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3882IUJ#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets.
The LTC3882IUJ#PBF belongs to Analog Devices' Power by Linear™ digital power controller family, designed specifically for intelligent, high-efficiency, multi-phase DC/DC regulation in data centers, telecom infrastructure, and automotive electronics.
FAQ
What is the maximum number of phases supported by the LTC3882IUJ#PBF?
The LTC3882IUJ#PBF itself is a dual-output controller supporting up to 4 phases per channel (8 total) when operated in parallel with up to three additional LTC3882IUJ#PBF units. Phase interleaving is synchronized via the SHARE_CLK pin, enabling precise current sharing and reduced input/output ripple in high-current applications.
Does the LTC3882IUJ#PBF require external components for basic operation?
Yes-the LTC3882IUJ#PBF requires external power stages (e.g., DrMOS, discrete FETs, or power blocks), output inductors, input/output capacitors, and feedback resistors. It also needs pull-up resistors on SCL/SDA, and optional configuration resistors for frequency, phase, and address setting. No external op-amps or compensators are needed due to its integrated error amplifiers and internal compensation networks.
Can the LTC3882IUJ#PBF operate without connecting the PMBus interface?
Yes-the LTC3882IUJ#PBF can operate autonomously using resistor-programmed defaults for output voltage, switching frequency, and sequencing. The PMBus interface is optional for runtime reconfiguration, telemetry, and fault logging; all critical functions remain active even with SCL/SDA unconnected.
What is the role of the IAVG_GND pin on the LTC3882IUJ#PBF?
The IAVG_GND pin on the LTC3882IUJ#PBF serves as the dedicated reference ground for the average current sense amplifier inputs (IAVG0 and IAVG1). It must be connected to the system power ground plane with low-inductance routing to minimize noise coupling and ensure accurate current measurement-especially critical when using inductor DCR sensing.
How does the LTC3882IUJ#PBF handle overtemperature conditions?
The LTC3882IUJ#PBF monitors die temperature via an internal sensor and supports external NTC/PTC thermistors on TSNS0/TSNS1 pins. Upon exceeding OT_FAULT_LIMIT (programmable), it asserts ALERT and disables PWM outputs within microseconds via hardware fault logic-not software polling-ensuring robust thermal protection even during firmware hangs or communication loss.
LTC3882IUJ#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:
- 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#PBF FAQ
1.How can I place an order for LTC3882IUJ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3882IUJ#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 LTC3882IUJ#PBF reliable?
The price and inventory of LTC3882IUJ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3882IUJ#PBF is usually 5 days.
3.What payment methods are accepted for LTC3882IUJ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3882IUJ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3882IUJ#PBF?
LTC3882IUJ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3882IUJ#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 LTC3882IUJ#PBF?
For technical support, including LTC3882IUJ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3882IUJ#PBF requirements.
6.How does Aetrix verify that LTC3882IUJ#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3882IUJ#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 LTC3882IUJ#PBF meets industry standards.
7.What is the process for return or replacement of LTC3882IUJ#PBF?
All LTC3882IUJ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3882IUJ#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 LTC3882IUJ#PBF part is unused and in its original packaging.
Return procedure for LTC3882IUJ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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