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Analog Devices Inc. LTM4676AIY#PBF
- Part No.:
- LTM4676AIY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 144-BBGA Module
- Datasheet:
-
LTM4676AIY#PBF.pdf
- Description:
- DC DC CNVRTR 0.5-5.4V 0.5-5.4V
- Quantity:
- Payment:
- Shipping:
Inventory:3,945
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Product details
Overview
LTM4676AIY#PBF from Analog Devices is a dual 13A or single 26A µModule® step-down DC/DC regulator with integrated PMBus digital power system management. It delivers ±0.5% DC output voltage accuracy over temperature, supports 0.5V–5.5V output range, and features fast analog control loops with telemetry readback of voltage, current, temperature, and uptime. It is used in high-density server, telecom, and AI accelerator power rails requiring precise sequencing and real-time monitoring.
For engineers reviewing the LTM4676AIY#PBF datasheet, LTM4676AIY#PBF pinout, LTM4676AIY#PBF application, or LTM4676AIY#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and telemetry specs, and two rigorously cross-checked alternative parts for digital power system design.
Technical Context
The LTM4676AIY#PBF implements constant-frequency current-mode control per channel with independent 16-bit ΔΣ ADCs for telemetry. Its dual-channel architecture supports phase interleaving (0°–300° programmable), parallel operation with current sharing, and synchronized switching via external SYNC or internal PLL.
It integrates EEPROM for nonvolatile configuration storage, supports all 7-bit PMBus slave addresses, and enables full digital servo mode for closed-loop voltage regulation. Telemetry polling reaches up to 125Hz, with time-averaged and peak values (e.g., running max VOUT, IOUT, temperature) stored onboard with ECC fault logging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Dual 13A per channel or single 26A total - enables high-current FPGA/GPU core rail delivery without external current-sharing circuitry. |
| Input Voltage Range | 4.5V to 26.5V - supports 5V, 12V, and 24V intermediate bus architectures across industrial and telecom systems. |
| Output Voltage Range | 0.5V to 5.5V - covers CPU core, memory, and I/O supply requirements with 244µV LSB resolution in readback. |
| DC Output Accuracy | ±0.5% over temperature - ensures stable voltage margins for advanced process nodes (e.g., 7nm/5nm ASICs) without manual calibration. |
| PMBus Interface | 400kHz I²C-compatible serial interface - enables integration with BMC/IPMI controllers for rack-level power telemetry and firmware updates. |
| Thermal Performance | θJC bottom = 0.8°C/W - allows direct thermal coupling to PCB copper planes for efficient heat extraction in compact 16mm × 16mm footprint. |
| Startup Time | 40ms turn-on - meets strict power-up sequencing windows in multi-rail systems with programmable delay and slew control. |
Pinout & Package
16mm × 16mm × 5.01mm BGA package with 144 leads; bottom-side thermal pad for enhanced thermal conduction. Package complies with JEDEC MSL Level 4 and RoHS SAC305 finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0 / VIN1 | Primary input power for Channel 0 / Channel 1 | Accepts 4.5V–26.5V; each channel has dedicated input path for optimal noise isolation and current sensing. |
| VOUT0 / VOUT1 | Regulated output terminals | Differentially sensed outputs; VOUT0 uses VOSNS0+/VOSNS0– pair, VOUT1 uses VOSNS1/SGND for <±5mV readback error at low voltages. |
| SCL / SDA | PMBus serial interface lines | 400kHz I²C-compliant; support SMBus alert response and multi-master arbitration for system-level power management. |
| RUN0 / RUN1 | Enable inputs for Channel 0 / Channel 1 | Active-high logic; enable/disable individual channels independently for dynamic rail control and fault containment. |
| ALERT | Open-drain fault indicator | Asserts on OV/UV/OT/fault events; supports daisy-chained interrupt reporting across multiple LTM4676A modules. |
| SYNC | External clock synchronization input | Accepts 225kHz–1.1MHz clock; enables precise phase alignment between multiple modules to reduce input ripple and EMI peaks. |
| SHARE_CLK | Current-share clock output | Drives external current-share resistors or other LTM4676A modules for accurate load balancing without master-slave hierarchy. |
| WP | EEPROM write protection | Hardware lock for critical configuration registers; prevents accidental overwrite of calibrated settings during field operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent telemetry ADCs | 16-bit ΔΣ converters per channel - deliver ±0.5% VOUT and ±250mA IOUT readback accuracy at 10A, enabling closed-loop margining without external sensors. |
| Onboard EEPROM with ECC | 10,000 write cycles, 10-year data retention - stores startup configurations, fault logs, and calibration data with error correction for field reliability. |
| Digital servo mode | Real-time PID-based voltage regulation - compensates for line/load transients faster than analog-only loops, reducing output deviation to <50mV under 6.5A/µs steps. |
| Programmable soft-start/stop | Configurable ramp rates and sequencing delays - eliminates inrush current and ensures safe power-up/down order across multi-voltage systems (e.g., core before I/O). |
| Phase-interleaved operation | 0°–300° programmable channel phasing - reduces input capacitor RMS current by up to 40% and lowers EMI emissions in dense board layouts. |
Applications
| Server CPU Core Power | AI Accelerator Board |
|---|---|
Use Scenario: High-current, dynamically scaled core voltage for dual-socket Xeon or AMD EPYC platforms with tight voltage tolerance. IC Role / Device Role / Timing Role: Dual-channel µModule delivering 13A per rail at 0.8–1.2V with PMBus-controlled DVFS and telemetry feedback to BMC. Use Value: Eliminates need for discrete power stages and external ADCs; ±0.5% accuracy maintains timing margins under transient loads up to 6.5A/µs. | Use Scenario: Power delivery for multi-die AI accelerators (e.g., NVIDIA A100/H100) requiring coordinated rail sequencing and thermal derating. IC Role / Device Role / Timing Role: Single 26A or dual 13A regulator managing VDDQ/VDDP rails with synchronized startup and per-rail temperature monitoring. Use Value: Onboard EEPROM stores device-specific calibration; telemetry polling at 125Hz enables real-time thermal throttling decisions without host intervention. |
| 5G Baseband Unit | Industrial PLC Controller |
Use Scenario: Compact, high-efficiency power for RF front-end FPGAs and data converters operating in thermally constrained outdoor enclosures. IC Role / Device Role / Timing Role: Dual-output regulator supplying 1.2V core and 3.3V I/O with remote margining and fault logging via PMBus to baseband controller. Use Value: 16mm × 16mm footprint fits tight PCB areas; –40°C to 125°C operation ensures reliability in uncooled outdoor deployments. | Use Scenario: Robust, long-lifecycle power for programmable logic controllers exposed to wide ambient swings and EMI-rich factory environments. IC Role / Device Role / Timing Role: Primary DC/DC converter with undervoltage lockout, overtemperature shutdown, and ECC-protected fault log for predictive maintenance. Use Value: Integrated SVIN supervision detects brownouts; onboard fault log retains last 10 events with timestamps for root-cause analysis after unexpected shutdowns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4677IY#PBF | Higher per-channel rating (18A vs. 13A); identical pinout and PMBus command set; improved current-sense accuracy (±1.5% vs. ±2.5% at 10A). | Targeted at next-gen AI/ASICs requiring >15A/core; same PCB layout but requires higher input capacitance and thermal headroom. | Select when peak current demand exceeds 13A per rail and board space allows increased thermal solution. |
| TPS546D24ARVFT | Single-channel 60A buck controller (not µModule); external power stage required; supports PMBus v1.3 but lacks integrated telemetry ADC and EEPROM. | Used where design flexibility outweighs integration - e.g., custom inductor selection or ultra-low-noise filtering for sensitive analog supplies. | Choose when system-level optimization (efficiency, size, cost) justifies added design effort and component count. |
Compared with LTM4676AIY#PBF, LTM4677IY#PBF offers higher current capacity in identical packaging, while TPS546D24ARVFT trades integration for configurability - making the former a drop-in upgrade and the latter a platform-level redesign option.
Availability
LTM4676AIY#PBF is available at Aetrix Electronics and suitable for server CPU core power, AI accelerator boards, 5G baseband units, and industrial PLC controllers requiring stable component supply across extended product lifecycles.
Supply support for LTM4676AIY#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 technologies, serving precision instrumentation, communications, and power management markets.
The LTM4676AIY#PBF belongs to the µModule regulator family designed for high-density, digitally managed power delivery in space-constrained, thermally demanding applications such as datacenter and edge AI hardware.
FAQ
What is the maximum supported input voltage for the LTM4676AIY#PBF?
The LTM4676AIY#PBF supports an absolute maximum input voltage of 28V on VINn and SVIN pins, with recommended operating range from 4.5V to 26.5V. Operation beyond 26.5V risks permanent damage and voids warranty compliance per Absolute Maximum Ratings table. The device's internal protection circuits respond within 35µs to overvoltage events on SVIN.
Does the LTM4676AIY#PBF support independent voltage sequencing for its two outputs?
Yes, the LTM4676AIY#PBF supports fully independent voltage sequencing via PMBus commands MFR_VOUT_COMMAND, ON_OFF_CONFIG, and MFR_TON_DELAY. Each channel (VOUT0/VOUT1) can be programmed with unique turn-on delay (0–255ms), rise time (0.1–100ms), and margining offset (±10%), enabling complex multi-rail startup sequences without external logic.
What is the accuracy of output current readback at full load for the LTM4676AIY#PBF?
At 13A full load, the LTM4676AIY#PBF achieves ±250mA output current readback accuracy in forced-continuous mode per Electrical Characteristics table. Measured IOUTn readback yields 13.1A typical value, with guaranteed accuracy bounded by ±2.5% relative error or ±250mA absolute - whichever is greater - across –40°C to 125°C.
Can the LTM4676AIY#PBF operate without PMBus communication enabled?
Yes, the LTM4676AIY#PBF operates autonomously using factory-default EEPROM settings or pin-strapped configurations (e.g., VOUTnCFG resistors). PMBus is optional for runtime reconfiguration and telemetry; basic regulation continues with RUNn assertion even if SCL/SDA are unconnected or held static.
What thermal resistance values apply to the LTM4676AIY#PBF package?
The LTM4676AIY#PBF BGA package specifies θJC bottom = 0.8°C/W (junction-to-case via thermal pad), θJC top = 8.8°C/W, and θJA = 10.3°C/W (junction-to-ambient, measured per JESD51-12 on 4-layer board). These values assume 1oz copper, 20cm² thermal pad, and no airflow - actual performance improves with enhanced PCB copper and heatsinking.
LTM4676AIY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 144-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 26.5V
- Voltage - Output 1:
- 0.5 ~ 5.4V
- Voltage - Output 2:
- 0.5 ~ 5.4V
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 13A, 13A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OTP, OVP, SCP, UVLO
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-BGA (16x16)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4676AIY#PBF FAQ
1.How can I place an order for LTM4676AIY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4676AIY#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 LTM4676AIY#PBF reliable?
The price and inventory of LTM4676AIY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4676AIY#PBF is usually 5 days.
3.What payment methods are accepted for LTM4676AIY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4676AIY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4676AIY#PBF?
LTM4676AIY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4676AIY#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 LTM4676AIY#PBF?
For technical support, including LTM4676AIY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4676AIY#PBF requirements.
6.How does Aetrix verify that LTM4676AIY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4676AIY#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 LTM4676AIY#PBF meets industry standards.
7.What is the process for return or replacement of LTM4676AIY#PBF?
All LTM4676AIY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4676AIY#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 LTM4676AIY#PBF part is unused and in its original packaging.
Return procedure for LTM4676AIY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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