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Analog Devices Inc. LTC2995CUD#PBF
- Part No.:
- LTC2995CUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2995CUD#PBF.pdf
- Description:
- IC TEMP SENSOR VOLT MNTR 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,698
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Product details
Overview
LTC2995CUD#PBF from Analog Devices (formerly Linear Technology) is a high-accuracy dual voltage monitor and remote/internal temperature sensor IC with open-drain alert outputs. It delivers ±1°C remote diode temperature accuracy, 1.5% voltage threshold accuracy, and 3.5ms update interval across 2.25V–5.5V supply range. Used in network servers and desktop computers for core/I/O voltage supervision and thermal safety monitoring.
For engineers reviewing the LTC2995CUD#PBF datasheet, LTC2995CUD#PBF pinout, LTC2995CUD#PBF application, or LTC2995CUD#PBF equivalent, key selection criteria include remote diode ideality factor compensation (η = 1.004), series resistance cancellation up to several hundred ohms, VPTAT output slope of 4mV/K, and dual independent overtemperature/undertemperature thresholds with programmable hysteresis and reset timeout.
Technical Context
The LTC2995CUD#PBF implements a two-current diode sensing architecture that cancels series resistance errors by extracting and subtracting VCANCEL using an auxiliary current measurement. Its internal temperature-to-voltage converter produces VPTAT with calibrated 4mV/K gain for both internal die and external diodes matching η = 1.004.
Voltage monitoring uses a fixed 0.5V internal reference to compare VH1/VH2 (undervoltage) and VL1/VL2 (overvoltage) inputs; alerts are latched and released after a TMR-programmable timeout. The DS pin selects between internal, external, or alternating diode sensing, while PS configures VT1/VT2 as overtemperature, undertemperature, or mixed thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Temp Accuracy | ±1°C (0°C to 85°C), enables precise thermal margining in CPU/GPU power stages |
| Voltage Threshold Accuracy | ±1.5%, ensures reliable detection of 5V ±10% or 3.3V ±5% supply deviations |
| VPTAT Slope | 4mV/K (η = 1.004), allows direct Kelvin-to-voltage conversion without software calibration |
| Update Interval | 3.5ms typical, supports fast thermal response in dynamic load scenarios |
| Supply Range | 2.25V to 5.5V, compatible with 3.3V and 5V system rails without level shifting |
| Quiescent Current | 220μA typical, minimizes impact on battery-backed or low-power standby modes |
| Series Resistance Cancellation | Validated up to ~800Ω, permits accurate remote sensing over multi-inch PCB traces or cables |
Pinout & Package
20-lead (3mm × 3mm) plastic QFN package with exposed pad (optional GND connection). Pin functions validated per Linear Technology LTC2995 datasheet Rev. F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | 2.25V–5.5V main power rail; requires ≥0.1μF local bypass to GND |
| GND | Ground reference | Primary return path for all analog and digital circuitry |
| D+, D− | Remote diode sense terminals | D+ sources −8μA to −192μA current; D− sinks same; 470pF bypass required |
| DS | Diode select control | Three-state: VCC = internal, GND = external, open = alternating measurement |
| PS | Polarity select control | VCC = VT1=UT/VT2=OT, open = both OT, GND = both UT |
| VPTAT | Temperature voltage output | Proportional to absolute temperature (4mV/K); drives ±200μA, ≤1000pF load |
| VREF | Reference output | 1.8V ±3mV (LTC2995C grade); used to set VT1/VT2 thresholds via resistor dividers |
| VH1, VH2 | Undervoltage sense inputs | Trigger UV alert if either falls below 0.5V; tie to VCC if unused |
| VL1, VL2 | Overvoltage sense inputs | Trigger OV alert if either rises above 0.5V; tie to GND if unused |
| VT1, VT2 | Temperature threshold inputs | Compare against VPTAT to generate TO1/TO2 alerts; hysteresis ≈20mV |
| TO1, TO2 | Open-drain temp alerts | Pull low on threshold breach; weak 400kΩ pull-up to VCC; configurable timeout via TMR |
| UV, OV | Open-drain voltage alerts | Pull low on VHn < 0.5V (UV) or VLn > 0.5V (OV); same timeout behavior as TO1/TO2 |
| TMR | Reset delay timer | Capacitor sets timeout: 5ms + 8ms/nF; open = 500μs min; tied to VCC = bypass |
| Exposed Pad | Thermal & electrical ground | Optional solder connection to PCB GND plane improves thermal coupling and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Remote diode series resistance cancellation | Compensates up to ~800Ω series resistance without calibration, enabling long-sensor trace routing |
| Programmable temperature hysteresis | ≈20mV (≈5°C at 4mV/K) per threshold, prevents alert chatter near trip points |
| Configurable dual alert timing | Single TMR capacitor sets identical timeout for UV, OV, TO1, TO2 - simplifies BOM and layout |
| Internal/external diode selection | DS pin enables runtime switching between die temperature and remote transistor (e.g., MMBT3904) |
| Low-noise VPTAT output | 0.25°C RMS noise (0.6mV RMS), supports analog averaging for sub-0.02°C resolution |
Applications
| Server Core Voltage Monitoring | GPU Thermal Safety Shutdown |
|---|---|
Use Scenario: Real-time supervision of 12V/5V/3.3V rails powering CPU VRMs and memory interfaces in 1U rack servers. IC Role / Device Role / Timing Role: Dual voltage monitor compares VH1/VL1 and VH2/VL2 against 0.5V reference; generates UV/OV alerts with 3.5ms response. Use Value: Prevents catastrophic failure from undervoltage-induced data corruption or overvoltage-induced MOSFET avalanche during transient load steps. |
Use Scenario: Detecting thermal runaway in discrete GPU power stages using remote MMBT3904 transistor mounted on heatsink. IC Role / Device Role / Timing Role: Measures remote diode temperature via D+/D−; triggers TO1 (warning at 85°C) and TO2 (shutdown at 105°C) with 5ms TMR timeout. Use Value: Enables graded response-fan speed ramp before shutdown-while rejecting noise from PWM switching and series resistance from 15cm sensor traces. |
| Notebook Battery Protection | Industrial PLC I/O Module Monitoring |
Use Scenario: Monitoring Li-ion battery pack voltage and die temperature during charging cycles in ultrabook platforms. IC Role / Device Role / Timing Role: Uses internal temperature sensor (DS = VCC) and VH1/VL1 to supervise battery voltage; UV/OV alerts halt charging if out-of-spec. Use Value: Meets JEITA thermal regulation requirements with ±2°C internal accuracy and 1.5% voltage threshold tolerance across 0°C–70°C ambient. |
Use Scenario: Supervising 24V DC input and 5V logic rail in DIN-rail mounted PLC I/O modules operating in factory environments. IC Role / Device Role / Timing Role: Monitors VH2/VL2 for 24V rail overvoltage and VH1/VL1 for 5V logic rail undervoltage; alerts drive optocoupled fault signals. Use Value: Provides fail-safe operation under EMI-heavy conditions via input glitch rejection and 470pF D+/D− filtering, meeting IEC 61000-4-4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature and dual voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6603ESA+ | Single temperature sensor only; no voltage monitoring; 3-pin SOT23 package; ±2°C accuracy | Cannot replace dual-supply monitoring function; suitable only for pure thermal sensing in space-constrained designs | Select only when voltage supervision is handled separately and board area is critical |
| TPS3808G33DBVR | Dual voltage supervisor only; no temperature sensing; 6-pin SOT23; 0.5% threshold accuracy | Lacks remote/internal temperature capability; requires external ADC or thermistor circuit for thermal monitoring | Choose when higher voltage accuracy is needed and temperature monitoring is implemented elsewhere |
Compared with MAX6603ESA+ and TPS3808G33DBVR, the LTC2995CUD#PBF uniquely integrates precision dual-supply monitoring and ±1°C remote temperature sensing in one 3mm × 3mm QFN, eliminating need for separate ICs and reducing system-level calibration complexity.
Availability
LTC2995CUD#PBF is available at Aetrix Electronics and suitable for network servers, desktop computers, and environmental monitoring systems requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for LTC2995CUD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.
The LTC2995 belongs to ADI's precision monitoring and protection product line, designed specifically for high-reliability thermal and power integrity assurance in computing, communications, and industrial infrastructure equipment.
FAQ
What is the operating temperature range of the LTC2995CUD#PBF?
The LTC2995CUD#PBF is specified for 0°C to 70°C ambient operation (Commercial grade). This matches the "C" suffix in the part number and is validated per the Absolute Maximum Ratings table in the official datasheet. Internal temperature accuracy is ±2°C across this full range, while remote diode accuracy holds at ±1°C from 0°C to 85°C - exceeding the ambient rating due to sensor physics.
How does the LTC2995CUD#PBF compensate for series resistance in remote diode traces?
The LTC2995CUD#PBF performs active series resistance cancellation by measuring the remote diode voltage at three distinct test currents, extracting the parasitic resistance value, and subtracting a corresponding cancellation voltage (VCANCEL) from the final VPTAT output. This technique is validated to maintain ±1°C accuracy with up to ~800Ω series resistance, as shown in Figure G05 of the datasheet.
Can the LTC2995CUD#PBF monitor both internal and external temperature simultaneously?
No - the LTC2995CUD#PBF alternates between internal and external diode measurements when the DS pin is left floating (open). In that mode, VPTAT toggles every 30ms between voltages representing internal die temperature and remote sensor temperature. For simultaneous monitoring, two separate LTC2995CUD#PBF devices or a different IC architecture is required.
What is the purpose of the 470pF capacitor between D+ and D− on the LTC2995CUD#PBF?
The 470pF capacitor between D+ and D− on the LTC2995CUD#PBF suppresses high-frequency noise coupling into the sensitive diode sense path. It is explicitly recommended in the Applications Information section to prevent measurement errors caused by EMI and switching noise, especially near odd multiples of 6kHz. Larger values (>1nF) degrade settling time and introduce temperature error.
Does the LTC2995CUD#PBF require external resistors to set voltage thresholds?
Yes - the LTC2995CUD#PBF uses its internal 0.5V comparator reference, but external resistor dividers from VREF (1.8V) are required to scale VH1/VH2 and VL1/VL2 inputs to match desired UV/OV trip points. For example, monitoring a 5V ±10% rail requires RA ≈45.3kΩ, RB ≈10.2kΩ, and RC ≈442kΩ per the design procedure in the datasheet's Applications Information section.
LTC2995CUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 70°C, -40°C ~ 125°C
- Accuracy:
- ±2°C Local(Max), ±1.5°C Remote(Max)
- Topology:
- Comparator, Voltage Reference
- Output Type:
- Analog Voltage
- Output Alarm:
- Yes
- Output Fan:
- No
- Voltage - Supply:
- 2.25V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x3)
LTC2995CUD#PBF FAQ
1.How can I place an order for LTC2995CUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2995CUD#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 LTC2995CUD#PBF reliable?
The price and inventory of LTC2995CUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2995CUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2995CUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2995CUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2995CUD#PBF?
LTC2995CUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2995CUD#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 LTC2995CUD#PBF?
For technical support, including LTC2995CUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2995CUD#PBF requirements.
6.How does Aetrix verify that LTC2995CUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2995CUD#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 LTC2995CUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2995CUD#PBF?
All LTC2995CUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2995CUD#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 LTC2995CUD#PBF part is unused and in its original packaging.
Return procedure for LTC2995CUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2995CUD#PBF Tags
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EMC2101-ACZL-TR
Microchip Technology
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EMC2101-R-ACZL-TR
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onsemi
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MAX6684ESA+T
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