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Analog Devices Inc. LTC2997IDCB#TRMPBF
- Part No.:
- LTC2997IDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC2997IDCB#TRMPBF.pdf
- Description:
- SENSOR ANALOG -40C-85C 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,215
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Product details
Overview
LTC2997IDCB#TRMPBF from Analog Devices (acquired Linear Technology) is a high-accuracy analog-output remote/internal temperature sensor IC. It converts temperature from an external diode-connected NPN/PNP transistor or its internal die sensor into a precise 4mV/K VPTAT voltage output, with ±1°C remote and ±1.5°C internal accuracy over –40°C to +85°C. It features built-in series resistance cancellation, 1.8V reference output, and operates from 2.5V to 5.5V supply - used in CPU thermal monitoring, server environmental control, and embedded system thermal management.
For engineers reviewing the LTC2997IDCB#TRMPBF datasheet, LTC2997IDCB#TRMPBF pinout, LTC2997IDCB#TRMPBF application, or LTC2997IDCB#TRMPBF equivalent, key selection criteria include remote diode ideality factor compatibility (η = 1.004), VPTAT update interval (3.5ms), quiescent current (170μA), series resistance cancellation capability (≤100Ω), and DFN-6 (2mm × 3mm) package thermal performance.
Technical Context
The LTC2997IDCB#TRMPBF uses dual-current diode voltage measurement to solve the diode equation and derive absolute temperature independent of process-dependent saturation current (IS). Its resistance extraction circuit applies a third current (I₃) to quantify and cancel series resistance error in the remote sensing path.
It integrates an internal temperature sensor and automatic mode selection: tying D+ to VCC enables internal die measurement; D+ voltage >300mV below VCC triggers remote diode sensing. The VPTAT output is buffered, stable up to 1000pF load, and features 0.25°C RMS noise; VREF provides a 1.8V precision reference with ±1.5mV load regulation error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±0.25°C (0°C–100°C), ±1.5°C (–40°C–0°C), ±1.5°C (100°C–125°C) - enables high-fidelity thermal feedback for fan control or throttling |
| VPTAT Gain | 4mV/°K - allows direct Kelvin-to-voltage conversion: TKELVIN = VPTAT / 0.004 |
| Supply Voltage Range | 2.5V to 5.5V - supports operation across industrial and computing rails including 3.3V and 5V systems |
| Quiescent Current | 170μA typical - enables always-on thermal monitoring in battery-backed or low-power embedded applications |
| Update Interval | 3.5ms typical - provides rapid thermal response for dynamic thermal management loops |
| Reference Output | 1.8V ±3mV (LTC2997I grade) - usable as ADC reference or threshold generation for analog comparators |
| Series R Cancellation | Validated to ≤100Ω - eliminates wiring/resistance-induced error in long-cable or PCB trace deployments |
Pinout & Package
Package: 6-lead DFN (2mm × 3mm), exposed pad (optional GND connection), JEDEC MO-229 variation DCB6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Accepts 2.5V–5.5V; requires ≥0.1μF bypass to GND; UVLO activates below ~1.9V |
| GND | Ground reference | Return path for all currents; exposed pad may be soldered to PCB ground for improved thermal coupling |
| D+ | Diode sense current source | Sources sensing current to remote diode anode; tied to VCC to select internal temperature mode |
| D– | Diode sense current sink | Sinks current from remote diode cathode; connected to GND for single-wire remote sensing |
| VPTAT | Proportional-to-absolute-temperature output | 4mV/K analog voltage; drives ±200μA; stable with ≤1000pF load; pulled low during UVLO |
| VREF | Reference voltage output | 1.8V buffered reference; ±200μA drive capability; used for ADC reference or comparator thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Remote + Internal Dual Sensing | Single IC measures either external diode (e.g., MMBT3904) or internal die - reduces BOM count and layout complexity |
| Series Resistance Cancellation | Removes error from PCB traces, connectors, or cables up to 100Ω - eliminates calibration overhead in production |
| Micropower Operation | 170μA ICC enables continuous thermal monitoring without compromising system power budget |
| Factory-Calibrated Ideality Factor | η = 1.004 matches common NPN transistors (MMBT3904, CMPT3904) - ensures <0.5°C inter-device variation |
| Integrated 1.8V Reference | Stable, low-drift VREF supports analog threshold generation or ADC reference - avoids external reference IC |
Applications
| CPU Thermal Monitoring | Server Environmental Control |
|---|---|
Use Scenario: Real-time die temperature tracking of Intel/AMD CPUs or FPGAs using on-die PNP transistors. IC Role / Device Role / Timing Role: Remote temperature sensor converting transistor VBE to 4mV/K analog voltage for host ADC sampling. Use Value: Enables dynamic frequency scaling and fan speed control with ±1°C accuracy and 3.5ms update rate. | Use Scenario: Rack-level ambient and component temperature supervision in network servers and storage arrays. IC Role / Device Role / Timing Role: Dual-mode sensor measuring both local board temperature (internal) and remote hotspots (e.g., VRMs, ASICs). Use Value: Supports predictive thermal shutdown and airflow optimization using single-supply 2.5V–5.5V operation and 170μA quiescent current. |
| Embedded System Thermal Management | Analog Temperature Threshold Controller |
Use Scenario: Continuous thermal monitoring in industrial PLCs, medical devices, or automotive ECUs where digital interfaces are undesirable. IC Role / Device Role / Timing Role: Analog-output temperature sensor feeding directly into op-amp comparators or analog PID circuits. Use Value: Eliminates need for ADC and firmware polling; leverages VREF and VPTAT for self-contained analog control loops. | Use Scenario: Fan speed or heater activation based on absolute temperature thresholds (e.g., turn on cooling at 75°C). IC Role / Device Role / Timing Role: Precision analog sensor providing VPTAT and 1.8V reference to set comparator trip points without microcontroller involvement. Use Value: Achieves deterministic, zero-latency thermal response using resistor dividers off VREF and VPTAT - no software dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6602ASA+ | 0.5°C remote accuracy (0°C–70°C), 5V-only supply, SO-8 package, no internal sensor or VREF output | Limited to commercial temp range; lacks dual-mode sensing and reference - suitable only for simple remote-only use cases | Select when cost sensitivity outweighs accuracy, temperature range, or feature requirements |
| ADT7411ARMZ | I²C digital output, ±2°C remote accuracy, integrated 10-bit ADC, 3.0V–5.5V supply, MSOP-10 | Requires microcontroller interface and firmware; higher power (350μA); no analog VPTAT output | Select when digital integration, multi-channel monitoring, or higher resolution (0.0625°C) is prioritized over analog simplicity |
Compared with MAX6602ASA+ and ADT7411ARMZ, the LTC2997IDCB#TRMPBF uniquely delivers ±1°C remote accuracy over –40°C to +85°C with integrated VREF, internal/remote dual-mode operation, and micropower analog output - making it optimal for analog-centric, wide-temperature, and layout-constrained thermal designs.
Availability
LTC2997IDCB#TRMPBF is available at Aetrix Electronics and suitable for CPU thermal monitoring, server environmental control, and embedded system thermal management requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C industrial-grade performance.
Supply support for LTC2997IDCB#TRMPBF 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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2997IDCB#TRMPBF belongs to ADI's precision analog temperature sensor product line, engineered for high-accuracy, low-power, and robust remote thermal measurement in computing, industrial, and communications infrastructure.
FAQ
What is the operating temperature range of the LTC2997IDCB#TRMPBF?
The LTC2997IDCB#TRMPBF is rated for an operating ambient temperature range of –40°C to +85°C (Industrial grade). This is confirmed in the "ORDER INFORMATION" section of the datasheet, where "LTC2997I" denotes the Industrial temperature grade. The device maintains ±1°C remote and ±1.5°C internal temperature accuracy across this full range, with thermal performance validated via typical characteristics graphs (e.g., G01–G03).
How does the LTC2997IDCB#TRMPBF handle series resistance in remote sensing lines?
The LTC2997IDCB#TRMPBF implements active series resistance cancellation using a three-current measurement technique. It applies I₁ and I₂ to compute temperature, then uses I₃ to extract series resistance (RSERIES) and generate a cancellation voltage. This eliminates errors up to 100Ω, as verified in Figure G05 and Electrical Characteristics table (TRS parameter). No external compensation components are required.
Can the LTC2997IDCB#TRMPBF measure both internal and remote temperature simultaneously?
No, the LTC2997IDCB#TRMPBF performs sequential single-mode sensing: it measures either the internal die temperature or a remote diode, not both at once. Mode selection is hardware-based - tie D+ to VCC for internal sensing; leave D+ floating or connect to remote diode anode for remote sensing. The block diagram (BD) and "Operation" section confirm a single EXT/INT MUX selects one source for the temperature-to-voltage converter.
What is the purpose of the VREF pin on the LTC2997IDCB#TRMPBF?
The VREF pin on the LTC2997IDCB#TRMPBF provides a precision 1.8V buffered reference voltage with ±3mV tolerance over temperature (LTC2997I grade). It can serve as an ADC reference input, generate fixed temperature thresholds via resistor dividers, or bias analog circuitry - eliminating the need for an external reference IC and simplifying analog thermal control designs.
Which external transistors are recommended for use with the LTC2997IDCB#TRMPBF?
The LTC2997IDCB#TRMPBF is factory-calibrated for η = 1.004, matching standard NPN transistors including MMBT3904 (Fairchild, Diodes Inc., ON Semiconductor, NXP, Infineon) and CMPT3904 (Central Semiconductor). These are explicitly listed in Table 1 of the datasheet and yield <0.5°C inter-device error. Discrete diodes are not recommended due to higher ideality factors.
LTC2997IDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Analog, Local/Remote
- Sensing Temperature - Local:
- -40°C ~ 85°C
- Sensing Temperature - Remote:
- -40°C ~ 85°C
- Output Type:
- Analog Voltage
- Voltage - Supply:
- 2.5V ~ 5.5V
- Resolution:
- 4mV/°C
- Features:
- -
- Accuracy - Highest (Lowest):
- ±1.5°C
- Test Condition:
- 25°C
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 6-DFN (2x3)
LTC2997IDCB#TRMPBF FAQ
1.How can I place an order for LTC2997IDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2997IDCB#TRMPBF 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 LTC2997IDCB#TRMPBF reliable?
The price and inventory of LTC2997IDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2997IDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2997IDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2997IDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2997IDCB#TRMPBF?
LTC2997IDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2997IDCB#TRMPBF 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 LTC2997IDCB#TRMPBF?
For technical support, including LTC2997IDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2997IDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC2997IDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2997IDCB#TRMPBF 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 LTC2997IDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2997IDCB#TRMPBF?
All LTC2997IDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2997IDCB#TRMPBF, 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 LTC2997IDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2997IDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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