Overview
The LM45BIM3/NOPB is a precision integrated-circuit temperature sensor produced by Texas Instruments. This device is calibrated directly in degrees Celsius and features a linear output voltage that is proportional to the temperature, with a scale factor of +10.0 mV/°C. The LM45BIM3/NOPB is designed to operate over a wide temperature range of −20°C to +100°C, making it suitable for various applications requiring accurate temperature measurement.
The sensor does not require external calibration or trimming, ensuring low cost due to wafer-level trimming and calibration. It operates from a supply voltage range of 4.0V to 10V and draws a low current of less than 120 μA, minimizing self-heating to less than 0.2°C in still air.
Key Specifications
| Parameter | Conditions | Typical Limit | Maximum Limit |
|---|---|---|---|
| Accuracy | TA = +25°C | ±2.0°C | ±3.0°C |
| Accuracy | TA = TMIN to TMAX | ±3.0°C | ±4.0°C |
| Nonlinearity | TMIN ≤ TA ≤ TMAX | ±0.8°C | ±0.8°C |
| Sensor Gain (Average Slope) | TMIN ≤ TA ≤ TMAX | +9.7 mV/°C to +10.3 mV/°C | |
| Load Regulation | 0 ≤ IL ≤ +1 mA | ±35 mV/mA | |
| Line Regulation | +4.0V ≤ +VS ≤ +10V | ±0.80 mV/V | |
| Quiescent Current | +4.0V ≤ +VS ≤ +10V, +25°C | 120 μA | 160 μA |
| Supply Voltage Range | +4.0V to +10V | ||
| Operating Temperature Range | −20°C to +100°C |
Key Features
- Calibrated Directly in ° Celsius (Centigrade): The LM45BIM3/NOPB is calibrated directly in degrees Celsius, eliminating the need for external calibration or trimming.
- Linear Output: The output voltage is linearly proportional to the Celsius temperature with a scale factor of +10.0 mV/°C.
- High Accuracy: Guaranteed accuracy of ±2°C at room temperature and ±3°C over the full −20°C to +100°C temperature range.
- Wide Operating Range: Rated for full −20°C to +100°C temperature range.
- Suitable for Remote Applications: Can be used in remote applications due to its low output impedance and precise inherent calibration.
- Low Cost: Low cost due to wafer-level trimming and calibration.
- Low Power Consumption: Operates from a supply voltage range of 4.0V to 10V and draws less than 120 μA, minimizing self-heating.
- Low Self-Heating: Less than 0.2°C in still air.
Applications
- Battery Management: Suitable for monitoring battery temperatures.
- FAX Machines and Printers: Used in office equipment for temperature monitoring.
- Portable Medical Instruments: Ideal for medical devices requiring precise temperature measurement.
- HVAC Systems: Used in heating, ventilation, and air conditioning systems for temperature control.
- Power Supply Modules: Monitors temperature in power supply units.
- Disk Drives and Computers: Used in electronic devices for temperature monitoring.
- Automotive Systems: Suitable for various automotive applications requiring temperature measurement.
Q & A
- What is the operating temperature range of the LM45BIM3/NOPB?
The LM45BIM3/NOPB operates over a temperature range of −20°C to +100°C.
- What is the accuracy of the LM45BIM3/NOPB at room temperature?
The accuracy at room temperature is ±2°C.
- What is the scale factor of the LM45BIM3/NOPB?
The scale factor is +10.0 mV/°C.
- What is the supply voltage range for the LM45BIM3/NOPB?
The supply voltage range is from 4.0V to 10V.
- How much current does the LM45BIM3/NOPB draw from its supply?
The device draws less than 120 μA from its supply.
- What is the self-heating of the LM45BIM3/NOPB in still air?
The self-heating is less than 0.2°C in still air.
- Can the LM45BIM3/NOPB be used in remote applications?
Yes, it is suitable for remote applications due to its low output impedance and precise inherent calibration.
- What are some common applications of the LM45BIM3/NOPB?
Common applications include battery management, FAX machines, printers, portable medical instruments, HVAC systems, power supply modules, disk drives, computers, and automotive systems.
- How should the LM45BIM3/NOPB be handled to prevent electrostatic damage?
The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage.
- What is the thermal resistance of the SOT-23 package of the LM45BIM3/NOPB?
The thermal resistance of the SOT-23 package is 260°C/W when attached to a printed circuit board with 2 oz. foil.
