The LM57 is a precision, dual-output, temperature switch with integrated analog temperature sensor. The trip temperature (TTRIP) is programmable by using two external 1% resistors. Using extremely small packaged resistors (0.5 mm x 1 mm), the LM57 can be programmed to any of 256 trip temperatures while consuming very little board space. The VTEMP output delivers an analog output voltage which is proportional with a negative temperature coefficient (NTC) to the measured temperature.
Built-in temperature hysteresis (THYST) keeps the output stable in an environment of thermal oscillation. The digital temperature switch outputs will go active when the die temperature exceeds TTRIP and will release when the temperature falls below a temperature equal to TTRIP minus THYST
| LM57 | |
| # Comparators | 1 |
| Output Type | Open Drain or Push Pull |
| SetPoint Type | Resistor Programmable |
| Sensor Gain (mV/Deg C) | -5.166 to -12.924 |
| Accuracy Over Temp Range (Max) (C) | 1.5 |
| Supply Voltage (Min) (V) | 2.4 |
| Supply Voltage (Max) (V) | 5.5 |
| Iq (Typ) (uA) | 24 |
| Pin/Package | 8QFN, 8WSON |
| Approx. Price (US$) | 0.65 | 1ku |
| Rating | Catalog |