MAX6518UKP075+T Datasheet Information Summary

General Description

The MAX6518UKP075+T is a low-cost, fully integrated temperature switch designed to assert a logic signal when its die temperature crosses a factory-programmed threshold. Operating from a 2.7V to 5.5V supply, it features a fixed voltage reference, an analog temperature sensor, and a comparator. This device is accurate to ±0.5°C (typ) and requires no external components, typically consuming 22µA of supply current. It offers pin-selectable hysteresis at 2°C or 10°C and is available in a space-saving 5-pin SOT23 package.

Features

• High Accuracy ±1.5°C (max) over -15°C to +65°C temperature range
• Low Power Consumption—22µA typical current
• Factory-Programmed Thresholds from -45°C to +115°C in 10°C increments
• Analog Output for board-level testing
• Open-Drain or Push-Pull Outputs
• Pin-Selectable 2°C or 10°C Hysteresis

Applications

• Fan Control
• Test Equipment
• Temperature Control
• Temperature Alarms
• Over/Undertemperature Protection
• Notebook, Desktop PCs
• RAID
• Servers

Ordering Information

• Part Number: MAX6518UKP075+T
• Temperature Range: -55°C to +125°C
• Package: 5-pin SOT23
• Threshold Temperature: +75°C (hot threshold)

Pin Configuration

TableCopy

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.3V to +6V
• TOVER, TUNDER (open drain): -0.3V to +6V
• TOVER, TUNDER (push-pull): -0.3V to (VCC + 0.3V)
• OUT, HYST: -0.3V to (VCC + 0.3V)
• Continuous Power Dissipation (TA = +70°C): 247mW (SOT23, derate 3.1mW/°C above +70°C)
• Operating Temperature Range: -55°C to +125°C
• Junction Temperature: +150°C
• Storage Temperature Range: -65°C to +150°C
• Lead Temperature (soldering, 10s): +300°C
• Soldering Temperature (reflow): +260°C

Electrical Characteristics (VCC = 2.7V to 5.5V, TA = -55°C to +125°C)

• Supply Voltage Range (VCC): 2.7V to 5.5V
• Supply Current (ICC): 22µA typical
• Temperature Threshold Accuracy (ΔTTH): ±1.5°C (max) over -15°C to +65°C
• Hysteresis (THYST): 2°C or 10°C (pin-selectable)
• Input Logic Levels (VIH, VIL): 0.8 x VCC, 0.2 x VCC
• Logic Output Voltage High (VOH): VCC - 1.5V (ISOURCE = 500µA, VCC > 2.7V)
• Logic Output Voltage Low (VOL): 0.3V (ISINK = 1.2mA, VCC > 2.7V)
• Open-Drain Output Leakage Current: 10nA (VCC = 2.7V, open-drain output = 5.5V)

Detailed Description

The MAX6518UKP075+T incorporates a fixed reference, an analog temperature sensor, and a comparator. The temperature at which the two reference voltages are equal determines the temperature trip point. The OUT pin provides an analog voltage that varies with the die’s temperature. The device offers pin-selectable 2°C or 10°C hysteresis to prevent the digital output from oscillating when the die temperature approaches the threshold temperature.

Applications Information

The MAX6518UKP075+T can be used in various applications requiring temperature monitoring and control. It is particularly useful in systems where multiple temperature monitors are needed to increase reliability. The device can also be used for PC board testing to verify proper assembly and functionality of the temperature protection circuitry.

Thermal Considerations

The MAX6518UKP075+T typically dissipates negligible power when driving high-impedance loads, ensuring that the die temperature is essentially the same as the package temperature. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6518UKP075+T die. Short, wide copper traces between the device and the object being monitored ensure quick and reliable heat transfer.

Package Information

• Package Type: 5-pin SOT23
• Package Code: U5+2
• Outline Number: 21-0057
• Land Pattern Number: 90-0174