SNIS119F May 2004 – August 2017 LM60
TheLM60 devices are precision analog bipolar temperature sensors that can sense a −40°C to +125°C temperature range while operating from a single 2.7-V supply. The output voltage of the LM60 is linearly proportional to Celsius (Centigrade) temperature (6.25 mV/°C) and has a DC offset of 424 mV. The offset allows reading negative temperatures with a single positive supply. The nominal output voltage of the device ranges from 174 mV to 1205 mV for a −40°C to +125°C temperature range. The device is calibrated to provide accuracies of ±2.0°C at room temperature and ±3°C over the full −25°C to +125°C temperature range.
With a quiescent current of the device is less than 110 μA, self-heating is limited to a very low 0.1°C in still air in the SOT-23 package. Shutdown capability for the device is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates.
The output of the LM60 is a Class A base emitter follower, thus the LM60 can source quite a bit of current while sinking less than 1 µA. In any event load current should be minimized in order to limit it's contribution to the total temperature error. The temperature-sensing element is based on a delta VBE topology of two transistors (Q1 and Q2 in Functional Block Diagram) that are sized with a 10:1 area ratio.
The LM60 follows a simple linear transfer function to achieve the accuracy as listed in Electrical Characteristics as given:
The only functional mode for this device is an analog output directly proportional to temperature.