My Inquiry
My Account
Analog Devices Inc. LTC2979CY#PBF
- Part No.:
- LTC2979CY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 144-LBGA
- Datasheet:
-
LTC2979CY#PBF.pdf
- Description:
- 16-CHANNEL PMBUS LOW-VOLTAGE POW
- Quantity:
- Payment:
- Shipping:
Inventory:113
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2979CY#PBF from Analog Devices is a 16-channel PMBus Power System Manager IC used for sequencing, trimming, margining, supervising, fault management, telemetry monitoring, and autonomous EEPROM-based fault logging in multi-rail power systems. It features 16 VSENSEP/VSENSEM differential input pairs, eight 10-bit VDACP/VDACM DACs with soft-connect algorithm, internal 16-bit ADC, programmable watchdog timer, and single-wire SHARE_CLK synchronization across multiple ADI PSM devices - deployed in network servers and high-reliability medical imaging systems.
For engineers reviewing the LTC2979CY#PBF datasheet, LTC2979CY#PBF pinout, LTC2979CY#PBF application, or LTC2979CY#PBF equivalent, key selection criteria include per-channel OV/UV supervision accuracy (±1.25% over 2–6V), DAC full-scale output range (1.32–2.77V), 144-pin 12mm × 12mm BGA package with isolated Device A/B ground domains, and support for autonomous operation via configuration EEPROM with ECC.
Technical Context
The LTC2979CY#PBF implements dual-device architecture (Device A and Device B) with identical functionality per half, enabling coordinated control of up to 16 DC/DC converters. Each channel supports either voltage sensing (even-numbered) or voltage/current sensing (odd-numbered) via dedicated VSENSEP/VSENSEM inputs and corresponding VDACP/VDACM DAC outputs for servo control.
Its PMBus interface operates at up to 400kHz with full SMBus 2.0 compliance, while the SHARE_CLK bus synchronizes sequencing and fault response across multiple LTC2979 or compatible ADI PSM devices. The internal 16-bit ADC provides configurable resolution (122µV/LSB in voltage mode) and supports simultaneous telemetry acquisition across all 16 channels with programmable update timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Channels | 16 independent differential voltage sensing inputs (VSENSEPn/VSENSEMn) |
| DAC Resolution | 10-bit VDACP outputs with soft-connect algorithm minimizing supply disturbance during trim/margin |
| ADC Resolution | 16-bit ADC with 122 µV/LSB resolution in voltage sense mode; supports current sense on odd channels |
| Supervision Accuracy | ±1.25% TUE for 2–6V input range; ±1.0% for 1.5–3.8V high-resolution mode |
| Package | 144-pin BGA, 12mm × 12mm × 1.29mm, MSL Level 3, 0°C to 70°C operating junction temperature |
| Power Supply | VDD33 input: 3.13V to 3.47V; internal 2.5V regulator (VDD25) with 30–80mA short-circuit capability |
| EEPROM | Configuration EEPROM with ECC; 10,000 write cycles endurance; 20-year data retention at TJ < 105°C |
Pinout & Package
Package: 144-pin BGA (12mm × 12mm × 1.29mm), RoHS-compliant SAC305 finish, thermal pad exposed on bottom, Device A and Device B ground domains electrically isolated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSEP0–VSENSEP7 VSENSEM0–VSENSEM7 | Differential analog inputs | 16-channel voltage sensing (even) or voltage/current sensing (odd); VSENSEM must be tied to local GND or current-sense resistor return |
| VDACP0–VDACP7 VDACM0–VDACM7 | DAC output pairs | Eight 10-bit DACs drive external DC/DC converter feedback nodes; VDACM connects to local GND or current-sense return |
| VOUT_EN0–VOUT_EN7 VIN_EN | Open-drain enable outputs | Active-low enable signals with strong/weak pull-down options; sinking capability up to 9mA per pin |
| SHARE_CLK | Bidirectional clock sync | Single-wire bus synchronizing sequencing/fault response across multiple ADI PSM devices; requires 5.49kΩ pull-up to VDD33 |
| SDA / SCL | PMBus interface | Standard SMBus 2.0 compliant bidirectional data/clock; supports up to 400kHz operation |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel autonomous supervision | Independent OV/UV thresholds per channel with programmable fault responses including automatic disable and black-box EEPROM logging |
| Soft-connect DAC algorithm | Minimizes transient disturbance during voltage trim/margin by ramping DAC output before enabling feedback loop |
| Configurable ADC resolution | Selectable high-resolution (122 µV/LSB) or low-resolution (244 µV/LSB) modes per channel for optimal speed/accuracy trade-off |
| Internal watchdog timer | Programmable timeout with WDI/RESETB input; resets microprocessor on stall detection |
| EEPROM with ECC | Stores configuration, fault logs, and telemetry autonomously without host software; enables self-contained operation after power cycle |
Applications
| Server Power Sequencing | Medical Imaging PSU Control |
|---|---|
Use Scenario: Coordinating startup/shutdown order of 16 voltage rails in dual-socket x86 server motherboards with strict timing constraints. IC Role / Device Role / Timing Role: Centralized PMBus manager executing precise TON_DELAY/TOFF_DELAY sequences, validating PWRGD status, and triggering fault recovery. Use Value: Eliminates need for discrete timers and logic; reduces BOM count by consolidating 16 independent supervisors into single IC with shared telemetry bus. | Use Scenario: Managing isolated DC/DC supplies powering CT scanner detector arrays where rail failure must trigger immediate shutdown to prevent image corruption. IC Role / Device Role / Timing Role: Real-time per-rail OV/UV supervision with sub-12.21µs update period and automatic EEPROM fault capture upon violation. Use Value: Achieves IEC 62304 Class C safety compliance via deterministic fault response and nonvolatile event logging without host intervention. |
| Industrial Test Equipment | High-Reliability Avionics |
Use Scenario: Calibrating and margining 16 precision analog supply rails in automated test equipment requiring ±0.5% voltage accuracy. IC Role / Device Role / Timing Role: Closed-loop servo control using VDACP DACs to adjust FB node voltage; telemetry reported via PMBus for calibration database integration. Use Value: Enables factory-level margin testing at 0.5% target accuracy without external instrumentation, reducing test time and fixture complexity. | Use Scenario: Monitoring redundant power modules in flight control computers where single-point failures must not compromise system integrity. IC Role / Device Role / Timing Role: Synchronized fault detection across multiple LTC2979 units via SHARE_CLK; coordinated black-box logging to detect latent degradation patterns. Use Value: Supports DO-254 DAL-A requirements through deterministic fault propagation, ECC-protected configuration storage, and traceable telemetry history. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power system management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2977CUH#PBF | 8-channel version; same 144-pin BGA footprint but fewer VSENSE/DAC channels and no SHARE_CLK | Suitable for simpler systems with ≤8 rails; lacks multi-device synchronization and black-box fault logging | Select when cost or channel count drives design; not drop-in replaceable due to reduced feature set |
| MAX34441ETL+ | 12-channel PMBus manager; different pinout, no internal DACs, relies on external DACs for margining | Requires external components for trim/margin; lower integration but broader temp range (–40°C to +125°C) | Choose for extended temperature operation where DAC integration is secondary to ruggedness |
Compared with LTC2979CY#PBF, LTC2977CUH#PBF offers reduced channel count and no SHARE_CLK, making it unsuitable for synchronized multi-device systems, while MAX34441ETL+ trades integrated DACs and EEPROM logging for wider temperature tolerance and external flexibility.
Availability
LTC2979CY#PBF is available at Aetrix Electronics and suitable for network servers, medical imaging systems, and industrial test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC2979CY#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 (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2979CY#PBF belongs to ADI's Power System Management (PSM) product line, designed specifically for autonomous, high-precision control and telemetry of complex multi-rail power architectures in mission-critical systems.
FAQ
What is the operating temperature range for the LTC2979CY#PBF?
The LTC2979CY#PBF is rated for an operating junction temperature range of 0°C to 70°C, as indicated by the "Y" grade suffix in the part number. This distinguishes it from the industrial-grade LTC2979IY#PBF (–40°C to 105°C). Thermal derating applies for EEPROM writes above 85°C, and maximum junction temperature is limited to 125°C.
Does the LTC2979CY#PBF support autonomous operation without a host processor?
Yes, the LTC2979CY#PBF supports fully autonomous operation using its internal configuration EEPROM with ECC. Once programmed via PMBus, it executes sequencing, supervision, fault logging, and telemetry reporting independently - no host processor or firmware is required for basic functionality, making it ideal for systems with minimal software overhead.
How does the soft-connect DAC algorithm in the LTC2979CY#PBF reduce supply disturbance?
The LTC2979CY#PBF uses a proprietary soft-connect algorithm that ramps the VDACP output to its target value before connecting it to the DC/DC converter's feedback node. This prevents abrupt changes in the feedback path that would otherwise cause output voltage overshoot or undershoot, ensuring stable trim and margin operations without disrupting downstream loads.
Can the LTC2979CY#PBF monitor both voltage and current on the same channel?
Yes - odd-numbered channels (e.g., Channel 1, 3, 5, 7) of the LTC2979CY#PBF can be configured for current sensing by measuring the differential voltage across an external sense resistor connected between VSENSEPn and VSENSEMn. Even-numbered channels are voltage-only sensing paths, and all 16 channels support independent OV/UV supervision.
What is the purpose of the SHARE_CLK pin on the LTC2979CY#PBF?
The SHARE_CLK pin on the LTC2979CY#PBF enables hardware-level synchronization of sequencing and fault response across multiple ADI Power System Management devices. When connected together with appropriate pull-up, it ensures deterministic timing alignment - critical for coordinated power-up of distributed supplies in large systems like blade servers or modular avionics racks.
LTC2979CY#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:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-BGA (12x12)
LTC2979CY#PBF FAQ
1.How can I place an order for LTC2979CY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2979CY#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 LTC2979CY#PBF reliable?
The price and inventory of LTC2979CY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2979CY#PBF is usually 5 days.
3.What payment methods are accepted for LTC2979CY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2979CY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2979CY#PBF?
LTC2979CY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2979CY#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 LTC2979CY#PBF?
For technical support, including LTC2979CY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2979CY#PBF requirements.
6.How does Aetrix verify that LTC2979CY#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2979CY#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 LTC2979CY#PBF meets industry standards.
7.What is the process for return or replacement of LTC2979CY#PBF?
All LTC2979CY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2979CY#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 LTC2979CY#PBF part is unused and in its original packaging.
Return procedure for LTC2979CY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2979CY#PBF Tags
-
UC3845AD8TR
Texas Instruments
-
UC2843AD8TR
Texas Instruments
-
LM3880MFX-1AE/NOPB
Texas Instruments
-
LM3880MFX-1AA/NOPB
Texas Instruments
-
INA234AIYBJR
Texas Instruments
-
INA700AYWFR
Texas Instruments
-
LM3880MF-1AE/NOPB
Texas Instruments
-
LM3880MF-1AA/NOPB
Texas Instruments
-
LM3881MM/NOPB
Texas Instruments
-
UCC2802DTR
Texas Instruments
-
NCP4305DMTTWG
onsemi
-
INA237AIDGSR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
