Temperature-controlled switch and temperature sensing in a single chip

By implementing a temperature-activated switch as well as temperature sensing in the same device, National Semiconductors’ LM26LV saves space and can enhance functionality and thermal protection.

The LM26LV senses temperature to within ±2.3°C from -50°C to 150°C, and generates an analogue output voltage inversely proportional to the temperature sensed.

The temperature trip point for the switch is preset, and can be specified for any temperature from 0°C to 150°C in 1°C increments. An over-temperature indication is asserted when the die temperature exceeds the trip point and both active-high and active-low outputs are provided. There is also built-in hysteresis, which maintains a stable output in environments displaying temperature instability. In addition, the LM26LV provides facilities to test the switch and verify the temperature trip point.

The LM26LV operates from 1.6V to 5.5V. With 8µA supply current, 2.2mm x 2.5mm footprint, and high power-supply noise rejection, it can be used in a wide range of commercial and industrial applications.

 

FEATURES Linear temperature-sensing characteristic Short-circuit protection for analogue output ±2.2°C temperature trip point accuracy Hysteresis temperature: 4.5°C to 5.5°C ±100µA output-drive capability

APPLICATIONS Thermal protection circuits Remote monitoring Data logging Battery management

 

 

Vishay / TSOP75xxx