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Analog Devices Inc. LTC2977IUP#TRPBF
- Part No.:
- LTC2977IUP#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2977IUP#TRPBF.pdf
- Description:
- IC PWR SUPP CTRLR MONITOR 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,179
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Product details
Overview
LTC2977IUP#TRPBF from Analog Devices is an 8-channel PMBus-compliant Power System Manager used for sequencing, trimming, margining, supervising, fault management, telemetry, and black-box fault logging in high-reliability power systems. It integrates a 16-bit ADC for monitoring eight output voltages (±0.25% TUE), one input voltage, die temperature, and current-sense on odd channels; features programmable DACs with soft-connect algorithm; operates from –40°C to 105°C; and supports autonomous operation via internal EEPROM with ECC.
For engineers reviewing the LTC2977IUP#TRPBF datasheet, LTC2977IUP#TRPBF pinout, LTC2977IUP#TRPBF application, or LTC2977IUP#TRPBF equivalent, key selection criteria include channel count (8), PMBus compliance, ±0.25% voltage measurement accuracy, 64-pin QFN package, and support for autonomous sequencing/fault logging without host software.
Technical Context
The LTC2977IUP#TRPBF implements a dual-path supervision architecture: high-speed comparators (12.21 µs update) for OV/UV fault detection per channel, and a 16-bit ADC (6.15 ms conversion time) for precision telemetry. Its DACs use a proprietary soft-connect algorithm to minimize supply disturbance during servo/margin operations, and it supports synchronized multi-device coordination via single-wire SHARE_CLK.
It embeds configuration EEPROM with ECC for autonomous boot-up, includes a programmable watchdog timer (first timeout configurable via MFR_WATCHDOG_T_FIRST), and provides dedicated VIN_EN and eight VOUT_EN outputs for independent power rail control - all operating across a wide VPWR range (4.5V–15V) or directly from 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent power rail supervision and control channels |
| Voltage Accuracy | ±0.25% total unadjusted error for VIN_ADC ≥ 1V - enables precise closed-loop servo of point-of-load supplies |
| DAC Resolution | 10-bit with programmable full-scale (1.32–2.77V) - supports fine-grained margining and trim adjustments |
| Supervisor Speed | 12.21 µs update period for high-speed OV/UV detection - ensures rapid fault response before downstream damage |
| Operating Temp | –40°C to +105°C junction - qualified for industrial and medical embedded applications |
| Package | 64-pin 9mm × 9mm QFN with exposed thermal pad - supports high-density PCB layouts and thermal dissipation |
| PMBus Compliance | Fully compliant with PMBus v1.2 command set - interoperable with standard system management controllers and LTpowerPlay GUI |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed GND pad (Pin 65), requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSEP[7:0] / VSENSEM[7:0] | Differential voltage sense inputs | Eight pairs for measuring output voltages; odd-numbered channels support current sensing via external shunt |
| VDACP[7:0] / VDACM[7:0] | DAC output terminals | Eight independent 10-bit DACs with soft-connect logic - drive external feedback nodes for trim/margin without supply glitch |
| VOUT_EN[7:0] | Power rail enable outputs | Eight open-drain/driver outputs (split into two groups with different voltage ratings) - control DC/DC converter ON/OFF states |
| VIN_EN | Input supply enable output | Drives upstream supply enable - enables coordinated input-to-output sequencing |
| SHARE_CLK | Multi-device synchronization clock | Single-wire bus synchronizes sequencing and fault propagation across multiple LTC2977 or compatible PSM devices |
| FAULTB00–FAULTB11 | Programmable fault-bus outputs | Four bidirectional fault-bus pins supporting daisy-chained or star-topology fault propagation and recovery coordination |
| SDA / SCL / ALERTB | PMBus interface signals | Standard I²C/SMBus-compatible interface with alert interrupt - enables integration into existing system management infrastructure |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous EEPROM operation | On-chip ECC-protected EEPROM stores configuration, enabling full power-up sequencing and fault response without host CPU involvement |
| Black-box fault logging | Automatic capture of fault status, telemetry snapshot, and timestamp into internal EEPROM upon critical fault - aids root-cause analysis |
| Soft-connect DAC algorithm | Minimizes transient disturbance during voltage adjustment by ramping DAC output before connecting to feedback node |
| Multi-device synchronization | SHARE_CLK wire coordinates timing across up to 16 LTC PSM devices - ensures deterministic, jitter-free sequencing across complex systems |
| Programmable watchdog timer | Configurable first timeout (MFR_WATCHDOG_T_FIRST) and periodic timeout (MFR_WATCHDOG_T) - supports flexible microprocessor health monitoring |
Applications
| Server Power Management | Medical Imaging Power Sequencing |
|---|---|
Use Scenario: Sequencing and telemetry for 12V/5V/3.3V/1.8V/1.2V rails in dual-socket x86 servers with redundant PSUs. IC Role / Device Role / Timing Role: Centralized PMBus manager coordinating turn-on order, voltage margining, and fault containment across >20 DC/DC converters. Use Value: Eliminates need for discrete timers and FPGA-based sequencers; reduces BOM cost and improves repeatability of power-up behavior. | Use Scenario: Managing power sequencing and real-time voltage/temperature monitoring for CT scanner detector modules with strict safety interlocks. IC Role / Device Role / Timing Role: Fault-aware supervisor ensuring safe ramp-up of high-voltage bias supplies before analog front-end activation. Use Value: Enables automatic shutdown and EEPROM-stored fault log on overvoltage - meeting IEC 62304 Class C software requirements. |
| Industrial Test Equipment | High-Reliability Avionics |
Use Scenario: Precision voltage margining and telemetry in automated test equipment supplying DUTs with programmable 1.0–5.0V rails at ±0.5% tolerance. IC Role / Device Role / Timing Role: Closed-loop servo controller using DACs and ADC feedback to maintain target voltage under dynamic load changes. Use Value: Achieves ±0.25% voltage accuracy without external calibration - reducing test setup time and improving measurement confidence. | Use Scenario: Redundant power management in flight control computers requiring dual-LTC2977 synchronization and fail-safe fault logging. IC Role / Device Role / Timing Role: Dual-device coordinated sequencer with FAULTB bus propagation and shared SHARE_CLK - guarantees deterministic startup under EMI stress. Use Value: Meets DO-254/DO-160G requirements via autonomous EEPROM configuration and black-box fault records for certification 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 |
|---|---|---|---|
| LTC2978IUP#TRPBF | 16-channel version with identical pinout, same EEPROM architecture, but higher channel count and extended ADC resolution modes | Suitable when >8 rails require supervision; requires no PCB change but firmware reconfiguration for extra channels | Select when future scalability or denser rail counts are needed; shares same footprint and basic command set |
| TPS53689RTAT | TI 6-channel digital PWM controller with integrated MOSFET drivers; lacks autonomous EEPROM, black-box logging, and multi-device sync | Targeted at compact POL designs where integrated power stage is preferred over external DC/DCs | Choose only for cost-sensitive, lower-channel-count applications where host MCU handles sequencing logic |
Compared with LTC2977IUP#TRPBF, LTC2978IUP#TRPBF offers double the channel count in identical packaging and retains full backward compatibility, while TPS53689RTAT trades autonomy and telemetry depth for integration and lower BOM count - making it suitable only for simpler, host-managed systems.
Availability
LTC2977IUP#TRPBF is available at Aetrix Electronics and suitable for server power management, medical imaging systems, industrial test equipment, and high-reliability avionics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2977IUP#TRPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2977IUP#TRPBF belongs to the Power System Management (PSM) product line, designed specifically for autonomous, fault-resilient, and standards-compliant control of complex multi-rail power architectures in mission-critical systems.
FAQ
What is the operating temperature range for the LTC2977IUP#TRPBF?
The LTC2977IUP#TRPBF is rated for operation from –40°C to +105°C junction temperature, making it suitable for industrial and medical environments. This grade is confirmed by the "I" suffix in the part number and matches the specifications in the Absolute Maximum Ratings table. The device includes internal temperature sensing with ±1°C total unadjusted error, and its EEPROM retention is guaranteed for 20 years at TJ < 105°C.
Does the LTC2977IUP#TRPBF support autonomous power sequencing without a host processor?
Yes, the LTC2977IUP#TRPBF supports fully autonomous operation using its internal configuration EEPROM with ECC. Once programmed via PMBus or LTpowerPlay, it executes sequencing, servo, margining, and fault responses independently at power-up - no host processor or external firmware is required. This capability is explicitly documented in the DESCRIPTION and EEPROM sections of the datasheet.
How many power rails can the LTC2977IUP#TRPBF supervise and control?
The LTC2977IUP#TRPBF supervises and controls exactly eight independent power supply output channels, plus one input supply channel (VIN_SNS). Each channel has dedicated differential voltage sense inputs (VSENSEP/VSENSEM), DAC outputs (VDACP/VDACM), and enable outputs (VOUT_EN). The datasheet confirms this in the headline description, FEATURES list, and Pin Configuration diagram.
What is the voltage measurement accuracy of the LTC2977IUP#TRPBF ADC?
The LTC2977IUP#TRPBF ADC achieves ±0.25% total unadjusted error for input voltages ≥1V (TUE_ADC_VOLT_SNS), and ±2.5mV for 0–1V range. This specification applies across the full –40°C to +105°C temperature range and is verified in the Electrical Characteristics table. Accuracy is maintained using internal reference (1.232V, 3ppm/°C) and calibrated L16-format conversion.
Is the LTC2977IUP#TRPBF pin-compatible with other Linear/Analog Devices PSM ICs?
Yes, the LTC2977IUP#TRPBF is 100% pin-compatible with the LTC2978 and LTC2978A, as stated in the FEATURES section. All three share identical 64-pin QFN packaging, pin functions, and footprint. However, the LTC2978/LTC2978A offer 16 channels instead of 8, meaning firmware and configuration must be updated - but no PCB redesign is needed for migration.
LTC2977IUP#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- Power Supply Controller/Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 3.3V, 4.5V ~ 15V
- Current - Supply:
- 10 mA
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (9x9)
LTC2977IUP#TRPBF FAQ
1.How can I place an order for LTC2977IUP#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2977IUP#TRPBF 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 LTC2977IUP#TRPBF reliable?
The price and inventory of LTC2977IUP#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2977IUP#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2977IUP#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2977IUP#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2977IUP#TRPBF?
LTC2977IUP#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2977IUP#TRPBF 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 LTC2977IUP#TRPBF?
For technical support, including LTC2977IUP#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2977IUP#TRPBF requirements.
6.How does Aetrix verify that LTC2977IUP#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2977IUP#TRPBF 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 LTC2977IUP#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2977IUP#TRPBF?
All LTC2977IUP#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2977IUP#TRPBF, 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 LTC2977IUP#TRPBF part is unused and in its original packaging.
Return procedure for LTC2977IUP#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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