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Analog Devices Inc. LTC3882EUJ-1#PBF
- Part No.:
- LTC3882EUJ-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC3882EUJ-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK PMBUS 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
LTC3882EUJ-1#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 0.1V–5.25V output per channel, supports up to 8-phase operation via parallel configuration, achieves ±0.5% output voltage accuracy, and operates with switching frequencies from 250kHz to 1.25MHz. It is used in high-current server VRMs where precise telemetry, phase interleaving, and fault-logging EEPROM are required.
For engineers reviewing the LTC3882EUJ-1#PBF datasheet, LTC3882EUJ-1#PBF pinout, LTC3882EUJ-1#PBF application, or LTC3882EUJ-1#PBF equivalent, key selection criteria include its dual-channel PMBus-managed control, resistor-programmable frequency and output voltage, internal EEPROM with ECC and fault logging, ±70mV ISENSE differential range, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3882EUJ-1#PBF implements a constant-frequency, leading-edge voltage-mode PWM architecture with independent feedback loops per channel. Each channel supports both resistor-based and digital (PMBus) configuration of output voltage, soft-start, sequencing, margining, and AVP, with servo-mode regulation enabled via MFR_PWM_MODE command bit 6.
It integrates dual 10-bit ADCs for telemetry readback of VIN, VOUT, IOUT, and temperature (TSNS0/TSNS1), plus dedicated hardware fault response paths for UV/OV/OC/OT events-bypassing software latency. Phase synchronization and current sharing across up to four devices rely on SHARE_CLK and IAVG_GND reference alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.1V to 5.25V per channel; supports wide-range point-of-load regulation including sub-1V CPU/GPU rails. |
| Output Voltage Accuracy | ±0.5% over temperature; guaranteed with servo mode enabled, enabling tight tolerance compliance for ASIC/FPGA supplies. |
| Switching Frequency | 250kHz to 1.25MHz; programmable via FREQ_CFG resistor or external SYNC clock, balancing efficiency vs. size in high-density designs. |
| Current Sensing | ±70mV differential ISENSE range with ±175µV offset; supports accurate DCR or discrete sense resistor implementation with minimal gain error. |
| Telemetry Resolution | 10-bit VOUT/VIN/IOUT readback (244µV LSB for VOUT); enables real-time closed-loop monitoring without external ADCs. |
| EEPROM Features | Internal EEPROM with ECC and fault logging; retains configuration and fault history across power cycles, supporting field diagnostics and traceability. |
| PMBus Compliance | PMBus v1.3 compliant interface (SCL/SDA); supports full command set including READ_VOUT, IOUT_OC_FAULT_LIMIT, and STORE_USER_ALL for production programming. |
| Operating Temperature | –40°C to +125°C junction; qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and industrial edge computing environments. |
Pinout & Package
Package: 40-lead (6mm × 6mm) QFN with exposed thermal pad (Pin 41 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE0+/VSENSE0– | Differential output voltage sense inputs (Channel 0) | Enable Kelvin sensing for high-accuracy regulation; reject PCB trace IR drop in high-current applications. |
| ISENSE0+/ISENSE0– | Differential current sense inputs (Channel 0) | Interface directly to DCR network or shunt resistor; support bidirectional current measurement for AVP and phase balancing. |
| PWM0/PWM1 | Gate drive outputs (Channel 0/1) | Push-pull outputs driving external MOSFET gates or DrMOS; 2.7V VOH at 2mA ensures robust level-shifting into power stage drivers. |
| SHARE_CLK | PolyPhase clock distribution output | Drives clock input of slave LTC3882-1 devices to synchronize switching edges and enable accurate current sharing across phases. |
| IAVG_GND | Current averaging reference node | Common return for all IAVG pins in multi-phase systems; critical for stable inter-device current balance without external summing circuitry. |
| ALERT/FAULT0/FAULT1 | Open-drain fault reporting outputs | Hardware-fast fault signaling (3µs filter delay); allows immediate shutdown or system-level alert without waiting for PMBus polling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PMBus-controlled channels | Enables fully autonomous regulation of two distinct power rails (e.g., core and I/O) with separate sequencing, margining, and telemetry. |
| Resistor-programmable key parameters | FREQ_CFG, VOUT0_CFG, VOUT1_CFG, and PHAS_CFG pins allow analog configuration of frequency, output voltage, and phase offset-reducing firmware dependency during bring-up. |
| Hardware-accelerated fault response | Dedicated comparator paths for VOUT UV/OV, IOUT OC, and temperature faults trigger PWM disable within microseconds-bypassing software latency for safety-critical shutdown. |
| Internal EEPROM with ECC and logging | Stores configuration, fault timestamps, and event codes; ECC prevents silent corruption, and logging supports root-cause analysis after field failures. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood operation (–40°C to +125°C), including HTOL, TC, and ESD testing-enabling use in ADAS domain controllers and EV power modules. |
Applications
| Server VRM | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Regulating 0.8V/60A CPU core rail and 1.1V/40A SoC I/O rail in 2U rack server with dynamic load steps. IC Role / Device Role / Timing Role: Dual-channel PolyPhase controller managing gate timing, current sharing, and telemetry for two independent buck stages using DrMOS power blocks. Use Value: ±0.5% VOUT accuracy and 90ms round-robin telemetry update ensure stable operation during 50A/µs load transients while enabling real-time thermal derating. | Use Scenario: Powering vision processor and radar SoC in autonomous driving ECU with functional safety requirements. IC Role / Device Role / Timing Role: AEC-Q100-qualified digital controller providing ASIL-B compliant power sequencing, fault logging, and hardware-fast OV/OC shutdown. Use Value: Internal EEPROM fault logs and hardware-triggered PGOOD deassertion meet ISO 26262 diagnostic coverage requirements for power subsystems. |
| High-Density Network Switch | Industrial FPGA Accelerator Card |
Use Scenario: Delivering 1.2V/80A and 0.9V/50A to switch ASICs and SerDes banks in 1RU data center switch with strict thermal constraints. IC Role / Device Role / Timing Role: 4-phase master controller coordinating up to three LTC3882-1 slaves via SHARE_CLK to distribute 130A across eight phases. Use Value: Accurate PolyPhase current sharing (±300µV IAVG offset) minimizes thermal imbalance between parallel power stages, extending MOSFET lifetime. | Use Scenario: Supplying reconfigurable logic (1.0V) and transceiver banks (0.95V) on PCIe-based AI inference card with remote monitoring capability. IC Role / Device Role / Timing Role: Digital power manager interfacing with host BMC via PMBus to report rail health, temperature, and load trends over IPMI. Use Value: LTpowerPlay GUI integration and READ_VOUT/READ_IOUT commands enable predictive maintenance and dynamic voltage scaling in edge deployments. |
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 | Single-output controller with identical PMBus stack, higher max VOUT (10V), no SHARE_CLK or IAVG_GND pins. | Suitable only for single-rail systems; lacks native PolyPhase coordination capability required for >40A loads. | Select when only one regulated rail is needed and higher output voltage range is required. |
| TPS546D24ARVFT | TI dual-output PMBus controller; supports 2.5MHz max frequency, integrated MOSFET drivers, but no internal EEPROM or fault logging. | Requires external nonvolatile storage for configuration; lacks hardware-fault logging for long-term field diagnostics. | Select for cost-sensitive telecom applications where EEPROM and fault history are not mandatory. |
Compared with LTC3882EUJ-1#PBF, LTC3883IUJ#PBF offers higher voltage capability but cannot replace it in dual-rail PolyPhase systems, while TPS546D24ARVFT provides higher switching frequency and integration but sacrifices field-diagnostic EEPROM and AEC-Q100 qualification-making LTC3882EUJ-1#PBF the only choice for automotive or mission-critical server applications requiring fault traceability and phase-coordinated control.
Availability
LTC3882EUJ-1#PBF is available at Aetrix Electronics and suitable for server VRMs, automotive ADAS domain controllers, and high-density network switches requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant reliability.
Supply support for LTC3882EUJ-1#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, 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 LTC3882 product line delivers digitally managed, multi-phase DC/DC controllers for high-current, high-reliability power systems-designed specifically for servers, networking gear, and automotive ECUs demanding telemetry, fault resilience, and seamless firmware integration.
FAQ
What is the maximum supported switching frequency for the LTC3882EUJ-1#PBF?
The LTC3882EUJ-1#PBF supports a programmable switching frequency range of 250kHz to 1.25MHz. This upper limit is fixed for the -1 variant; the LTC3882-2 variant extends to 2.5MHz. Frequency is set either by an external resistor on the FREQ_CFG pin or synchronized to an external clock on the SYNC pin. Operation at 600kHz, 750kHz, 900kHz, and 1MHz is explicitly discouraged in new designs per the datasheet.
Does the LTC3882EUJ-1#PBF support hardware-based current sharing across multiple phases?
Yes, the LTC3882EUJ-1#PBF implements hardware-accelerated PolyPhase current sharing via the SHARE_CLK output and IAVG_GND reference node. When multiple LTC3882-1 devices operate in master/slave configuration, SHARE_CLK synchronizes switching edges, and IAVG_GND provides a common current-summing reference-achieving accurate inter-device current balance with ±300µV typical offset, independent of software polling.
Can the LTC3882EUJ-1#PBF be used in automotive applications?
Yes, the LTC3882EUJ-1#PBF is AEC-Q100 Grade 1 qualified (–40°C to +125°C), with validated reliability for automotive under-hood environments. It includes hardware fault responses, EEPROM fault logging, and robust EMC performance-making it suitable for ADAS domain controllers, infotainment power supplies, and EV battery management subsystems requiring functional safety awareness.
How does the internal EEPROM in the LTC3882EUJ-1#PBF enhance system reliability?
The LTC3882EUJ-1#PBF integrates EEPROM with ECC and dedicated fault logging. It stores user configuration (voltage, sequencing, limits), retains settings across power cycles, and records timestamped fault events (OV, OC, OT) with cause codes. This enables post-failure diagnostics, eliminates boot-time reprogramming delays, and supports ISO 26262 diagnostic coverage requirements in automotive applications.
What current sensing methods are supported by the LTC3882EUJ-1#PBF?
The LTC3882EUJ-1#PBF supports both resistor-based and inductor DCR current sensing via its ±70mV differential ISENSE inputs. It includes programmable gain and offset calibration (via PMBus commands like IOUT_CAL_GAIN), and features ±175µV typical input offset referred to the sense terminals-enabling accurate, low-loss current measurement across wide dynamic ranges without external amplifiers.
LTC3882EUJ-1#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, Frequency Control, Phase Control, Power Good
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
LTC3882EUJ-1#PBF FAQ
1.How can I place an order for LTC3882EUJ-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3882EUJ-1#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 LTC3882EUJ-1#PBF reliable?
The price and inventory of LTC3882EUJ-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3882EUJ-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3882EUJ-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3882EUJ-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3882EUJ-1#PBF?
LTC3882EUJ-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3882EUJ-1#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 LTC3882EUJ-1#PBF?
For technical support, including LTC3882EUJ-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3882EUJ-1#PBF requirements.
6.How does Aetrix verify that LTC3882EUJ-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3882EUJ-1#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 LTC3882EUJ-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3882EUJ-1#PBF?
All LTC3882EUJ-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3882EUJ-1#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 LTC3882EUJ-1#PBF part is unused and in its original packaging.
Return procedure for LTC3882EUJ-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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