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Analog Devices Inc. LTC2997IDCB#TRPBF
- Part No.:
- LTC2997IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog and Digital Output
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC2997IDCB#TRPBF.pdf
- Description:
- SENSOR ANALOG -40C-85C 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,598
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Product details
Overview
LTC2997IDCB#TRPBF from Analog Devices (acquired Linear Technology) is a high-accuracy analog-output remote/internal temperature sensor IC. It converts external diode or on-die temperature into a precise 4mV/K VPTAT voltage output, features built-in series resistance cancellation, delivers ±1°C remote and ±1.5°C internal accuracy over –40°C to +85°C, and operates from 2.5V to 5.5V supply - used in thermal monitoring of CPUs, FPGAs, and power systems.
For engineers reviewing the LTC2997IDCB#TRPBF datasheet, LTC2997IDCB#TRPBF pinout, LTC2997IDCB#TRPBF application, or LTC2997IDCB#TRPBF equivalent, key selection criteria include its 3.5ms VPTAT update interval, 1.8V reference output, 170μA quiescent current, 6-pin DFN package, and support for NPN/PPN transistors (e.g., MMBT3904) as remote sensors.
Technical Context
The LTC2997IDCB#TRPBF implements dual-mode sensing via an internal temperature diode or external diode-connected transistor, using multi-current measurement and series resistance extraction (I₁/I₂/I₃) to cancel lead resistance errors up to 100Ω. Its VPTAT output is buffered and calibrated for η = 1.004 ideality factor.
It integrates a precision 1.8V reference (±3mV initial accuracy, ±1.5mV load regulation), supports single-wire remote sensing (D– tied to GND), and includes UVLO at 1.9V typical with VPTAT pulled low during undervoltage. Thermal step response shows <5s die-to-air settling under standard PCB conditions.
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 in server CPU throttling. |
| VPTAT Gain | 4mV/K - allows direct Kelvin-to-voltage conversion: TKELVIN = VPTAT / 0.004, simplifying analog temperature scaling. |
| Supply Range | 2.5V to 5.5V - compatible with 3.3V and 5V system rails without level-shifting. |
| Quiescent Current | 170μA typical - supports always-on thermal monitoring in battery-backed or low-power embedded systems. |
| 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 source for comparator-based thermal alarms. |
| Series Resistance Cancellation | Validated to ≤100Ω - eliminates calibration drift caused by PCB trace resistance between IC and remote sensor. |
Pinout & Package
Package: 6-lead (2mm × 3mm) plastic DFN (DCB) with optional exposed pad grounded for improved thermal coupling. θJA = 64°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+ | Diode sense current source | Sources sensing current to remote diode anode; tie to VCC to enable internal temperature mode. |
| D– | Diode sense current sink | Sinks sensing current from remote diode cathode; tie to GND for single-wire remote sensing. |
| GND | Device ground reference | Return path for all currents; must be low-impedance connection to system ground plane. |
| VCC | Power supply input | 2.5V–5.5V operation; requires ≥0.1μF bypass capacitor to GND for noise immunity. |
| VPTAT | Proportional-to-absolute-temperature output | 4mV/K analog voltage; drives ≤±200μA load; stable with ≤1000pF capacitance. |
| VREF | 1.8V precision reference output | Stable 1.8V reference; same drive capability and capacitive limit as VPTAT; open if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in series resistance cancellation | Removes error from up to 100Ω trace resistance without software compensation or calibration. |
| Internal/external sensor auto-selection | D+ voltage vs VCC threshold automatically selects internal die or external diode mode - no configuration pins required. |
| Low-noise VPTAT output | 0.25°C RMS noise (1mV RMS) - enables sub-degree resolution with minimal external filtering. |
| Micropower operation | 170μA ICC at 3.3V - extends runtime in energy-constrained thermal monitors and IoT edge nodes. |
| Robust remote sensing interface | Tolerates ≤±200mV DC ground offset and rejects AC interference at odd multiples of 6kHz - suitable for long-cable deployments. |
Applications
| CPU Thermal Monitoring | FPGA Die Temperature Control |
|---|---|
|
Use Scenario: Real-time die temperature tracking of Intel/AMD CPUs or Xilinx/Altera FPGAs during high-load compute cycles. IC Role / Device Role / Timing Role: Remote temperature sensor interfacing with embedded PNP diode or discrete MMBT3904 placed near processor thermal hotspot. Use Value: ±1°C remote accuracy and 3.5ms update rate enable responsive thermal throttling before critical junction temperatures are exceeded. |
Use Scenario: Closed-loop thermal management of FPGA fabric and I/O banks in telecom baseband or AI accelerator cards. IC Role / Device Role / Timing Role: Analog temperature transducer feeding VPTAT into ADC or comparator for fan speed or clock gating control. Use Value: 1.8V VREF provides stable reference for analog threshold detection, eliminating need for external voltage reference IC. |
| Server Rack Environmental Sensing | Analog Heater/Fan Controller |
|
Use Scenario: Ambient and component-level temperature profiling across 1U/2U rack-mounted servers with distributed sensor placement. IC Role / Device Role / Timing Role: Low-quiescent remote sensor deployed at multiple board locations (VRM, memory, ASIC) with shared VCC/GND routing. Use Value: 170μA supply current and 6-pin DFN footprint minimize board area and power overhead per sensing node. |
Use Scenario: Direct analog PWM generation for thermal actuation - e.g., heater control in industrial enclosures or fan speed in network switches. IC Role / Device Role / Timing Role: VPTAT and VREF serve as inputs to op-amp circuits (e.g., LTC6079) implementing proportional-integral control or fixed-threshold switching. Use Value: 4mV/K slope and 1.8V reference allow resistor-based target setting (e.g., 75°C = 1.3917V) without microcontroller intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-output temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6602ESA+ | Single remote channel, ±2°C remote accuracy, 2.7V–5.5V supply, no internal sensor or VREF output. | Lacks internal temperature sensing and reference voltage - requires external reference for threshold comparison. | Choose when only remote sensing is needed and higher accuracy is not required; lower cost but reduced feature set. |
| ADT7411ARMZ | I²C digital output, ±1°C remote accuracy, integrated 10-bit ADC, 2.7V–5.5V supply, no analog VPTAT output. | Requires MCU interface and firmware; no direct analog control loop compatibility. | Prefer when digital BOM consolidation, multi-channel monitoring, or programmable thresholds are prioritized over analog simplicity. |
Compared with MAX6602ESA+ and ADT7411ARMZ, the LTC2997IDCB#TRPBF uniquely combines analog VPTAT output, internal temperature sensing, and a buffered 1.8V reference in one micropower DFN - enabling zero-MCU thermal control loops with minimal external components.
Availability
LTC2997IDCB#TRPBF is available at Aetrix Electronics and suitable for CPU thermal monitoring, FPGA die temperature control, and server rack environmental sensing requiring stable component supply across industrial temperature ranges.
Supply support for LTC2997IDCB#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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2997 belongs to ADI's precision analog temperature sensor product line, designed specifically for applications demanding accurate, low-power, analog-based thermal feedback without microcontroller dependency.
FAQ
What is the operating temperature range of the LTC2997IDCB#TRPBF?
The LTC2997IDCB#TRPBF is rated for –40°C to +85°C ambient operation (Industrial grade). This range is confirmed in the "ORDER INFORMATION" table and supported by electrical characteristics tested across that span, including ±1.5°C internal temperature error and ±1°C remote accuracy within 0°C–100°C.
How does the LTC2997IDCB#TRPBF achieve series resistance cancellation?
The LTC2997IDCB#TRPBF uses a three-current measurement method (I₁, I₂, I₃) to extract series resistance (RS) in the D+/D– path. A dedicated resistance extraction circuit generates VCANCEL equal to RS × I₃, which is subtracted from the raw diode voltage - eliminating error terms before VPTAT conversion. This is validated to ≤100Ω in typical performance graphs.
Can the LTC2997IDCB#TRPBF measure both internal and remote temperature simultaneously?
No - the LTC2997IDCB#TRPBF measures either internal die temperature or remote diode temperature at any given time. Mode selection is automatic: if D+ voltage is > VCC – 300mV, it uses the internal sensor; otherwise, it sources current into the external diode. Simultaneous dual-sensing requires devices like the LTC2990.
What is the purpose of the 1.8V VREF output on the LTC2997IDCB#TRPBF?
The 1.8V VREF output on the LTC2997IDCB#TRPBF serves two primary functions: (1) as a stable reference for external ADCs measuring VPTAT, and (2) as a precision voltage source for generating temperature threshold voltages (e.g., via resistor dividers) to feed comparators in analog thermal alarm circuits - eliminating need for separate reference ICs.
Which external transistors are recommended for use with the LTC2997IDCB#TRPBF?
The LTC2997IDCB#TRPBF is factory-calibrated for η = 1.004 and explicitly recommends MMBT3904 (NPN) from Fairchild, Diodes Inc., ON Semiconductor, NXP, Infineon, and Rohm - all in SOT-23 or SC-70 packages. These exhibit <0.5°C inter-manufacturer variation due to process consistency, making them drop-in replacements for remote sensing.
LTC2997IDCB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC2997IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2997IDCB#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 LTC2997IDCB#TRPBF reliable?
The price and inventory of LTC2997IDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2997IDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2997IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2997IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2997IDCB#TRPBF?
LTC2997IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2997IDCB#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 LTC2997IDCB#TRPBF?
For technical support, including LTC2997IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2997IDCB#TRPBF requirements.
6.How does Aetrix verify that LTC2997IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2997IDCB#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 LTC2997IDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2997IDCB#TRPBF?
All LTC2997IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2997IDCB#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 LTC2997IDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2997IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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