Overview
The Texas Instruments LMT87LPM is a precision CMOS temperature sensor designed for high accuracy and low power consumption. It operates with a supply voltage as low as 2.7 V and consumes a quiescent current of 5.4 µA, making it suitable for battery-powered applications such as drones and sensor nodes. The sensor provides a linear analog output voltage that is inversely proportional to temperature, with a typical accuracy of ±0.4°C over a wide temperature range of –50°C to 150°C.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2.7 | 5.5 | V | |
| Quiescent Current | 5.4 | µA | ||
| Temperature Accuracy (70°C to 150°C) | -2.7 | ±0.4 | 2.7 | °C |
| Temperature Range | -50 | 150 | °C | |
| Average Sensor Gain | -13.6 | mV/°C | ||
| Output Drive Capability | -50 | 50 | µA | |
| Power-on Time | 0.7 | 1.9 | ms | |
| Thermal Time Constant (TO-92S package) | 10 | s (1.2 m/s Airflow) |
Key Features
- Very accurate with ±0.4°C typical accuracy and ±2.7°C maximum accuracy.
- Low 2.7-V operation with a quiescent current of 5.4 µA.
- Average sensor gain of -13.6 mV/°C.
- Wide temperature range from –50°C to 150°C.
- Output is short-circuit protected.
- Push-pull output with ±50-µA drive capability.
- Footprint compatible with industry-standard LM20/19 and LM35 temperature sensors.
- Cost-effective alternative to thermistors.
- Fast thermal time constant in TO-92S package, suitable for off-board time-temperature sensitive applications.
Applications
- Automotive: Infotainment and cluster, powertrain systems.
- Smoke and heat detectors.
- Drones.
- Appliances.
- General temperature-sensing applications.
- Battery-powered applications requiring low power consumption.
Q & A
- What is the operating voltage range of the LMT87LPM?
The LMT87LPM operates with a supply voltage range of 2.7 V to 5.5 V. - What is the typical accuracy of the LMT87LPM temperature sensor?
The typical accuracy is ±0.4°C. - What is the quiescent current of the LMT87LPM?
The quiescent current is 5.4 µA. - What is the temperature range of the LMT87LPM?
The temperature range is from –50°C to 150°C. - What is the average sensor gain of the LMT87LPM?
The average sensor gain is -13.6 mV/°C. - Is the output of the LMT87LPM short-circuit protected?
Yes, the output is short-circuit protected. - What is the drive capability of the LMT87LPM output?
The output has a ±50-µA drive capability. - What packages are available for the LMT87LPM?
The LMT87LPM is available in SC70, TO-92, and TO-92S packages. - How does the LMT87LPM handle capacitive loads?
The LMT87LPM can drive a capacitive load less than or equal to 1100 pF without additional components. For loads greater than 1100 pF, a series resistor may be required. - What are some typical applications of the LMT87LPM?
Typical applications include automotive systems, smoke and heat detectors, drones, appliances, and general temperature-sensing applications.
