LTC2995HUD#TRPBF

Thermal Management Overview

The LTC2995HUD#TRPBF is a high-accuracy temperature sensor and dual voltage monitor featuring open-drain alert outputs. It converts the temperature of an external diode or its own die to an analog output voltage while rejecting errors due to noise and series resistance. Two supply voltages and the measured temperature are compared against upper and lower limits set with resistive dividers. If a threshold is exceeded, the device communicates an alert by pulling low the corresponding open-drain logic output. The device provides ±1°C accurate temperature results using commonly available NPN or PNP transistors or temperature diodes built into modern digital devices. Voltages are monitored with 1.5% accuracy. A 1.8V reference output simplifies threshold programming and can be used as an ADC reference input. The LTC2995 provides an accurate, low power solution for temperature and voltage monitoring in a compact 3mm × 3mm QFN package.

Thermal Management Feature Summary

• Combines high-accuracy temperature sensing with dual voltage supervision in a single component
• Provides analog voltage output proportional to absolute temperature (VPTAT) for remote or internal diode sensors
• Features adjustable overvoltage/undervoltage and overtemperature/undertemperature thresholds via external resistor dividers
• Includes series resistance cancellation to maintain accuracy with long cable runs to remote sensors

Thermal Management Applications

• Network servers
• Core and I/O voltage monitors
• Desktop and notebook computers
• Environmental monitoring systems

Thermal Management Procurement Notes

Verify the specific suffix HUD indicates the extended industrial temperature range of -40°C to +125°C. Confirm the TRPBF designation corresponds to tape and reel packaging. Ensure compatibility with the required 2.25V to 5.5V supply voltage range. Check for RoHS compliance status if required by your manufacturing process. Validate pinout compatibility with existing PCB footprints for the 20-lead QFN package.

Thermal Management Selection Notes

Select this component when simultaneous monitoring of two distinct voltage rails and one temperature point is required. Choose the HUD variant for applications operating in environments ranging from -40°C to +125°C. Consider the VPTAT analog output if downstream processing requires direct temperature voltage conversion rather than digital alerts. Evaluate the need for series resistance cancellation if remote sensors are located at a distance from the controller.

Thermal Management Part Context

The LTC2995 belongs to Analog Devices' family of mixed-signal monitoring ICs designed for system protection and environmental awareness. It integrates precision analog-to-digital conversion for temperature with window comparators for voltage supervision. The device replaces discrete solutions involving separate thermistors, voltage supervisors, and op-amps, thereby reducing board space and component count in complex electronic systems.

Thermal Management Replacement Considerations

LTC2995CUD#TRPBF

Thermal Management FAQ

How does the LTC2995 handle series resistance in remote temperature sensing?

The device uses a resistance extraction circuit that measures the diode at multiple currents to determine the series resistance value. It then subtracts a cancellation voltage equal to the error caused by this resistance, allowing accurate measurements even with several hundred ohms of series resistance.

What is the function of the DS (Diode Select) pin?

The DS pin selects the temperature sensor location. Connecting it to VCC monitors the internal diode, connecting it to GND monitors the external diode, and leaving it open allows the device to alternate between measuring both sensors.

How are the temperature threshold polarities configured?

The PS (Polarity Select) pin determines whether VT1 and VT2 act as undertemperature or overtemperature thresholds. Connecting PS to VCC configures VT1 as undertemperature and VT2 as overtemperature. Leaving PS unconnected configures both as overtemperature, while connecting PS to GND configures both as undertemperature.