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Analog Devices Inc. LTC2977CUP#TRPBF
- Part No.:
- LTC2977CUP#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2977CUP#TRPBF.pdf
- Description:
- IC PWR SUPP CTRLR MONITOR 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,667
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Product details
Overview
LTC2977CUP#TRPBF from Analog Devices is an 8-channel PMBus-compliant Power System Manager IC used to sequence, trim, margin, supervise, and fault-log DC/DC power supplies in high-reliability systems. It features ±0.25% voltage measurement accuracy (≥1V), 16-bit ADC telemetry, programmable soft-connect DACs, and autonomous EEPROM-based operation. It serves as a central supervisory controller in multi-rail server and medical imaging power architectures.
For engineers reviewing the LTC2977CUP#TRPBF datasheet, LTC2977CUP#TRPBF pinout, LTC2977CUP#TRPBF application, or LTC2977CUP#TRPBF equivalent, key selection criteria include channel count (8), PMBus v1.2 compliance, ±0.25% TUE ADC accuracy for output voltage monitoring, 64-pin QFN package with exposed thermal pad, and support for autonomous sequencing without host firmware.
Technical Context
The LTC2977CUP#TRPBF integrates eight independent high-speed voltage supervisors (OV/UV per channel), one input voltage supervisor, and die temperature monitoring - all backed by a 16-bit ADC with configurable resolution (122 µV/LSB in voltage sense mode). Its proprietary soft-connect DAC algorithm minimizes supply disturbance during servo/margining operations.
It supports inter-device synchronization via single-wire SHARE_CLK bus, enabling coordinated sequencing and fault propagation across multiple LTC PSM devices. Configuration EEPROM with ECC enables fully autonomous startup and fault logging without external software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent power rail supervision and control channels |
| ADC Accuracy | ±0.25% of reading for VIN_ADC ≥ 1V - enables precise closed-loop voltage trimming |
| DAC Resolution | 10-bit with programmable full-scale (1.32–2.77V) - supports fine-grained margining |
| Supervisor Speed | 12.21 µs update period per channel - detects fast transients before system damage |
| Operating Temp | 0°C to 70°C (C-grade) - suitable for commercial/industrial server and test equipment |
| Package | 64-pin 9mm × 9mm QFN with exposed GND pad - optimized for thermal dissipation in dense PCB layouts |
| PMBus Compliance | PMBus v1.2 - ensures interoperability with standard power management GUIs (e.g., LTpowerPlay) |
| EEPROM Endurance | 10,000 write cycles at 0°C–85°C - supports field-updatable configurations and fault logs |
Pinout & Package
Package: 64-lead plastic QFN (9mm × 9mm), exposed thermal pad (Pin 65 = GND), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSEP[7:0] | Positive analog input for voltage/current sensing | Differential input for 8 rails; odd-numbered channels support current-sense resistor measurement |
| VSENSEM[7:0] | Negative analog input for voltage/current sensing | Common-mode reference; supports ±0.1V range for precision current sensing |
| VDACP[7:0]/VDACM[7:0] | DAC output terminals | Soft-connect buffered outputs (10-bit) for trimming/margining feedback nodes |
| VOUT_EN[7:0] | Power rail enable outputs | Eight open-drain/driver outputs (split into two groups) for controlling DC/DC converter EN pins |
| VIN_EN | Input supply enable output | Drives upstream supply enable to coordinate input-to-output sequencing |
| SHARE_CLK | Multi-device synchronization clock | Single-wire bus synchronizes sequencing/fault response across multiple LTC2977 or LTC2978 devices |
| FAULTB[11:00] | Programmable fault broadcast outputs | Four dedicated open-drain outputs for cascading fault signals to other PSM devices or system logic |
| SDA/SCL | PMBus interface | I²C-compatible bidirectional serial bus (up to 400 kHz) for configuration and telemetry readback |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous EEPROM operation | On-chip ECC-protected EEPROM stores configuration, sequencing, and fault log data - eliminates need for external microcontroller or host boot code |
| Soft-connect DAC algorithm | Minimizes transient disturbance during voltage adjustment by ramping DAC output before enabling control loop |
| Black-box fault logging | Automatically captures pre-fault telemetry (voltages, temps, status flags) into internal EEPROM upon OV/UV/OT fault trigger |
| Multi-device coordination | SHARE_CLK and FAULTB pins enable synchronized power-up/down and fault propagation across up to 8 LTC PSM devices |
| Wide input supply range | Operates from VPWR = 4.5V–15V or direct 3.3V VDD33 - simplifies biasing in mixed-voltage systems |
| Programmable watchdog timer | Monitors WDI/RESETB pin activity; resets downstream microprocessor if stalled - enhances system reliability |
Applications
| Server Power Management | Medical Imaging PSU |
|---|---|
Use Scenario: Sequencing and telemetry for 12V/5V/3.3V/1.8V/1.2V rails in dual-CPU rack servers with hot-swap capability. IC Role / Device Role / Timing Role: Central PMBus manager coordinating turn-on order, real-time voltage margining, and black-box logging of undervoltage faults on CPU core rails. Use Value: Ensures deterministic power-up timing (<12.21 µs supervisor response) and ±0.25% voltage accuracy to meet Intel VR13/VR14 specifications. | Use Scenario: Supervision of isolated DC/DC converters powering CT scanner detector ASICs and FPGA subsystems. IC Role / Device Role / Timing Role: Fault-tolerant supervisor with autonomous EEPROM recovery - maintains safe shutdown state after radiation-induced latch-up events. Use Value: Internal EEPROM retention (>20 years at <105°C) and ECC protection ensure reliable fault history storage in mission-critical diagnostics equipment. |
| Industrial Test Equipment | High-Reliability Avionics |
Use Scenario: Multi-rail power control in automated test equipment requiring programmable voltage margining for DUT validation. IC Role / Device Role / Timing Role: Precision trim/margin engine using 10-bit DACs and 122 µV/LSB ADC resolution to validate ±3% tolerance on 2.5V reference rails. Use Value: Soft-connect DAC prevents step-load transients during margin testing - avoids false triggering of downstream overcurrent protection. | Use Scenario: Redundant power system monitoring in flight control computers where single-point failure must be avoided. IC Role / Device Role / Timing Role: Dual-fault-broadcast (FAULTB00/01/10/11) and SHARE_CLK synchronization enable cross-board fail-safe sequencing with <1 µs skew. Use Value: Programmable fault responses (disable + retry delay) and autonomous restart via MFR_RESTART_DELAY meet DO-254 functional safety requirements. |
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 capacity, extended –40°C to 105°C temp range, identical pinout and command set | Required for higher channel count or extended temperature environments (e.g., base station power shelves) | Select when >8 rails must be managed or industrial temperature grade is mandatory |
| TPS53689RTAR | 6-channel digital PWM controller with integrated MOSFET drivers; no standalone telemetry or EEPROM | Used in compact POL designs where regulation and supervision are co-located, not distributed | Select only when replacing entire DC/DC + manager stack - not a drop-in substitute for LTC2977CUP#TRPBF's supervisory role |
Compared with LTC2977CUP#TRPBF, the LTC2978IUP#TRPBF offers double the channel count and wider temperature range in the same footprint, while the TPS53689RTAR integrates regulation but lacks autonomous telemetry, EEPROM, and PMBus flexibility - making it unsuitable as a direct functional replacement.
Availability
LTC2977CUP#TRPBF is available at Aetrix Electronics and suitable for server power management, medical imaging power systems, and industrial test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2977CUP#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.
The LTC2977CUP#TRPBF belongs to the Power System Management (PSM) product line, designed specifically for autonomous, PMBus-compliant supervision and sequencing of multi-rail DC/DC power systems in high-reliability computing and instrumentation.
FAQ
What is the operating temperature range for the LTC2977CUP#TRPBF?
The LTC2977CUP#TRPBF is rated for 0°C to 70°C junction temperature (C-grade). This specification is confirmed in the Absolute Maximum Ratings table and applies across all electrical characteristics unless otherwise noted. The device uses internal thermal monitoring and EEPROM derating logic above 105°C, but the C-grade variant is validated only within its specified commercial temperature range. Always verify ambient PCB temperature rise to ensure TJ remains within limits.
Does the LTC2977CUP#TRPBF support autonomous power sequencing without a host processor?
Yes, the LTC2977CUP#TRPBF supports fully autonomous operation via its on-chip configuration EEPROM with ECC. Sequencing delays, voltage thresholds, fault responses, and margining targets can be pre-programmed and executed at power-up without any external microcontroller or host firmware. This capability is explicitly documented in the "EEPROM" and "Operation Overview" sections of the datasheet.
Can the LTC2977CUP#TRPBF measure current, and how is it implemented?
Yes, the LTC2977CUP#TRPBF measures current on odd-numbered channels (CH1, CH3, CH5, CH7) by sensing the differential voltage across an external sense resistor. It supports both voltage-sense and current-sense modes per channel, with dedicated 170 mV full-scale range and ±0.7% TUE accuracy for 20–170 mV inputs. The ADC automatically configures for high-resolution current measurement when enabled in the MFR_CONFIG_LTC2977 register.
What is the purpose of the SHARE_CLK pin on the LTC2977CUP#TRPBF?
The SHARE_CLK pin on the LTC2977CUP#TRPBF provides a single-wire synchronization interface that coordinates timing-critical operations - such as power-on sequencing, fault detection, and telemetry sampling - across multiple LTC Power System Management devices. It operates at 90–110 kHz and ensures sub-microsecond alignment between devices, enabling deterministic multi-board power management in large systems like blade servers or MRI power racks.
Is the LTC2977CUP#TRPBF pin-compatible with other members of the LTC297x family?
Yes, the LTC2977CUP#TRPBF is 100% pin-compatible with the LTC2978 and LTC2978A, as stated in the "Features" section of the datasheet. This allows direct upgrade paths to 16-channel variants without PCB redesign. However, pin compatibility does not imply identical functionality - the LTC2978 adds channels and extended temperature range, but shares identical pin functions, package dimensions, and power/ground layout.
LTC2977CUP#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (9x9)
LTC2977CUP#TRPBF FAQ
1.How can I place an order for LTC2977CUP#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2977CUP#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 LTC2977CUP#TRPBF reliable?
The price and inventory of LTC2977CUP#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2977CUP#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2977CUP#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2977CUP#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2977CUP#TRPBF?
LTC2977CUP#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2977CUP#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 LTC2977CUP#TRPBF?
For technical support, including LTC2977CUP#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2977CUP#TRPBF requirements.
6.How does Aetrix verify that LTC2977CUP#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2977CUP#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 LTC2977CUP#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2977CUP#TRPBF?
All LTC2977CUP#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2977CUP#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 LTC2977CUP#TRPBF part is unused and in its original packaging.
Return procedure for LTC2977CUP#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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