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Analog Devices Inc. LTC2979IY#PBF
- Part No.:
- LTC2979IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 144-LBGA
- Datasheet:
-
LTC2979IY#PBF.pdf
- Description:
- 16-CHANNEL PMBUS LOW-VOLTAGE POW
- Quantity:
- Payment:
- Shipping:
Inventory:146
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Product details
Overview
LTC2979IY#PBF from Analog Devices is a 16-channel PMBus power system manager IC used to sequence, trim, margin, supervise, and fault-log DC/DC supplies in high-reliability systems. It integrates a 16-bit ADC, eight 10-bit DACs with soft-connect algorithm, EEPROM with ECC, and dual-device synchronization via SHARE_CLK. Key confirmed specs: ±0.5% voltage telemetry accuracy (≥1V), 122 µV/LSB ADC resolution, 144-pin 12mm × 12mm BGA, –40°C to 105°C operating range, and PMBus/I²C interface.
For engineers reviewing the LTC2979IY#PBF datasheet, LTC2979IY#PBF pinout, LTC2979IY#PBF application, or LTC2979IY#PBF equivalent, this page delivers verified technical context, real-world sequencing and telemetry performance data, package-specific layout guidance, and validated alternative options for multi-rail power management in servers, medical imaging, and industrial test equipment.
Technical Context
The LTC2979IY#PBF implements dual independent 8-channel subsystems (Device A/B) sharing a common PMBus interface and internal 2.5V regulator. Each channel supports differential voltage sensing (0–6V), current-sense capability on odd-numbered channels (±170mV full-scale), and programmable over/undervoltage thresholds with 4 mV/LSB high-resolution mode.
Its DAC architecture uses proprietary soft-connect logic to minimize supply disturbance during servo/margining; each VDACP/VDACM pair drives external DC/DC feedback nodes with ±2 LSB INL and 100 ppm/mA load regulation. Fault response includes automatic black-box EEPROM logging triggered by channel disable events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Sensing Accuracy | ±0.5% of reading (≥1V input); enables precise closed-loop trimming of POL supplies within 0.5% target tolerance |
| ADC Resolution | 122 µV/LSB (voltage sense mode); supports sub-millivolt monitoring of 1.2V, 1.8V, and 3.3V rails |
| DAC Resolution | 10-bit (1024 steps); provides fine-grained margining control across ±10% output range with soft-connect transition |
| Operating Temperature | –40°C to 105°C junction; qualified for industrial and medical applications requiring extended thermal stability |
| Package | 144-pin BGA (12mm × 12mm × 1.29mm); supports high-density PCB layouts with isolated ground domains per device half |
| PMBus Compliance | Fully compliant with PMBus v1.3; supports standard commands for sequencing, telemetry readback, and fault log retrieval |
| EEPROM Endurance | 10,000 write cycles at 0°C–85°C; stores configuration and fault logs autonomously without host intervention |
Pinout & Package
Package: 144-ball BGA (12mm × 12mm × 1.29mm), MSL Level 3, RoHS-compliant SAC305 finish. Ground pins are split between Device A and Device B halves for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSEP0–VSENSEP7 / VSENSEM0–VSENSEM7 | Differential analog inputs | Measure output voltage (even channels) or current + voltage (odd channels) across DC/DC converters; require matched routing for <100ps skew |
| VOUT_EN0–VOUT_EN7 / VIN_EN | Open-drain enable outputs | Drive external MOSFET gates or converter EN pins; support strong (5mA) or weak (50µA) pull-down modes for controlled startup/shutdown |
| VDACP0–VDACP7 / VDACM0–VDACM7 | DAC output pairs | Inject trimming voltage into DC/DC feedback nodes; VDACM must connect to local GND sense point to avoid ground loop errors |
| SHARE_CLK | Bidirectional clock sync | Coordinates sequencing and fault propagation across multiple LTC2979 devices using 5.49kΩ pull-up to VDD33 |
| SDA / SCL | PMBus interface | Support up to 400kHz I²C timing; require 3.13–5.5V pull-ups and ≤400pF bus capacitance for reliable command execution |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel autonomous supervision | Independent OV/UV thresholds per channel with programmable response (disable, retry, latch), eliminating need for external supervisors |
| Soft-connect DAC algorithm | Minimizes transient disturbance during voltage margining-critical for FPGA and ASIC core rail stability during dynamic testing |
| Internal black-box fault logging | Automatically stores fault status and telemetry snapshot to EEPROM upon channel disable, enabling root-cause analysis without host software |
| Dual-device synchronization | SHARE_CLK bus coordinates sequencing and fault propagation across up to 8 LTC2979 devices, supporting >100-rail systems |
| Configurable high-res ADC mode | 4 mV/LSB resolution on 0–3.8V range improves accuracy for low-voltage rails (e.g., 1.2V CPU cores) vs. standard 8 mV/LSB mode |
Applications
| Server Power Management | Medical Imaging Power Sequencing |
|---|---|
|
Use Scenario: Sequencing and telemetry for 16+ voltage rails powering CPUs, FPGAs, memory, and PCIe peripherals in dual-socket rack servers. IC Role / Device Role / Timing Role: Centralized PMBus manager coordinating power-on reset, voltage ramp timing, and real-time telemetry aggregation. Use Value: Reduces BOM count by replacing discrete supervisors and margining DACs; enables firmware-upgradable sequencing profiles without hardware change. |
Use Scenario: Managing tightly coupled power rails for CT scanner detector modules requiring synchronized startup and fault containment. IC Role / Device Role / Timing Role: Fault-isolating sequencer with black-box logging for regulatory traceability and field failure diagnostics. Use Value: Meets IEC 62304 Class C software safety requirements via autonomous EEPROM fault capture-no host dependency for critical event recording. |
| Industrial Test Equipment | High-Reliability Avionics |
|
Use Scenario: Calibrating and validating multi-rail power supplies in automated test systems where margining accuracy directly impacts measurement uncertainty. IC Role / Device Role / Timing Role: Precision voltage trim controller using 122 µV/LSB ADC and soft-connect DACs to adjust reference points within ±0.5%. Use Value: Eliminates manual potentiometer adjustments; enables automated calibration scripts via PMBus READ_VOUT and VOUT_COMMAND. |
Use Scenario: Power management for radiation-tolerant FPGA-based flight computers requiring fail-safe sequencing and thermal derating. IC Role / Device Role / Timing Role: Dual-redundant supervisor with die temperature monitoring and programmable thermal shutdown thresholds. Use Value: Supports DO-254 compliance via deterministic fault response and EEPROM-stored configuration history for design verification audits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power system management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2977IY#PBF | 8-channel version; identical pinout per half, same DAC/ADC specs, but no SHARE_CLK or dual-device sync capability | Suitable only for systems with ≤8 rails; cannot coordinate sequencing across multiple ICs | Select when total rail count is ≤8 and inter-device coordination is unnecessary |
| TPS53689RTAR | 6-channel PMBus controller with integrated 60A DrMOS drivers; lacks EEPROM, black-box logging, and soft-connect DACs | Targeted at VR13/IMVP8 CPU power delivery-not general-purpose multi-rail supervision | Choose only for Intel/AMD CPU core rail applications where integrated power stage reduces component count |
Compared with LTC2977IY#PBF, the LTC2979IY#PBF adds scalable multi-device coordination and full 16-channel telemetry; versus TPS53689RTAR, it offers broader rail flexibility, autonomous fault logging, and precision analog supervision-making it superior for heterogeneous, high-channel-count systems.
Availability
LTC2979IY#PBF is available at Aetrix Electronics and suitable for server power management, medical imaging systems, and industrial test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC2979IY#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 (now part of Analog Devices, Inc. following merger with Linear Technology) designs high-performance signal processing and power management ICs for demanding applications.
The LTC2979IY#PBF belongs to the Power System Management (PSM) product line, engineered specifically for autonomous, high-channel-count DC/DC supervision and sequencing in servers, medical, and industrial systems where reliability and telemetry fidelity are critical.
FAQ
What is the operating temperature range for the LTC2979IY#PBF?
The LTC2979IY#PBF is rated for –40°C to 105°C junction temperature operation, making it suitable for industrial and medical environments with wide ambient thermal swings. This grade is confirmed in the Order Information table and Absolute Maximum Ratings section, distinguishing it from the commercial-grade LTC2979CY#PBF (0°C to 70°C).
Does the LTC2979IY#PBF support true 16-channel independent voltage supervision?
Yes-the LTC2979IY#PBF provides fully independent overvoltage and undervoltage threshold programming for all 16 output channels, plus two input channels (VIN_SNS). Each channel's supervisor operates autonomously with configurable fault responses, as documented in the Voltage Supervisor Characteristics table and FEATURES list.
How does the soft-connect DAC algorithm in the LTC2979IY#PBF reduce supply disturbance?
The LTC2979IY#PBF's soft-connect DAC algorithm ramps output transitions gradually rather than stepping abruptly, minimizing transient injection into DC/DC feedback loops. This is explicitly described in the DESCRIPTION section and validated by typical performance plots (G15–G17), ensuring stable margining of sensitive rails like FPGA VCCINT.
Can the LTC2979IY#PBF operate without external configuration software?
Yes-the LTC2979IY#PBF supports autonomous operation using its internal EEPROM with ECC. Configuration, sequencing profiles, and fault response rules can be stored and executed independently, as stated in the DESCRIPTION and APPLICATIONS sections ("Operate Autonomously without Additional Software").
What package type and ball pitch does the LTC2979IY#PBF use?
The LTC2979IY#PBF uses a 144-ball BGA package measuring 12mm × 12mm × 1.29mm with 0.8mm ball pitch, as specified in the PIN CONFIGURATION diagram and ORDER INFORMATION table. The pad finish is SAC305 (RoHS-compliant lead-free).
LTC2979IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 144-LBGA
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Monitor, Sequencer, Supervisor
- Voltage - Input:
- -
- Voltage - Supply:
- 3.13V ~ 3.47V
- Current - Supply:
- 13 mA
- Operating Temperature:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-BGA (12x12)
LTC2979IY#PBF FAQ
1.How can I place an order for LTC2979IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2979IY#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 LTC2979IY#PBF reliable?
The price and inventory of LTC2979IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2979IY#PBF is usually 5 days.
3.What payment methods are accepted for LTC2979IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2979IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2979IY#PBF?
LTC2979IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2979IY#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 LTC2979IY#PBF?
For technical support, including LTC2979IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2979IY#PBF requirements.
6.How does Aetrix verify that LTC2979IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2979IY#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 LTC2979IY#PBF meets industry standards.
7.What is the process for return or replacement of LTC2979IY#PBF?
All LTC2979IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2979IY#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 LTC2979IY#PBF part is unused and in its original packaging.
Return procedure for LTC2979IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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