Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23

 

Part Number	Replacement	Explanation

Description

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The MAX6501–MAX6504 low-cost, fully integrated temperature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. Operating from a +2.7V to +5.5V supply, these devices feature two on-chip, temperature-dependent voltage references and a comparator. They are available with factory-trimmed temperature trip thresholds from -45°C to +125°C in 10°C increments, and are accurate to ±0.5°C (typ) or ±6°C (max). These devices require no external components and typically consume 30µA supply current. Hysteresis is pin-selectable at 2°C or 10°C.

The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (µP) reset input. The MAX6502/MAX6504 have an active-high, push-pull output intended to directly drive fan-control logic. The MAX6501/MAX6502 are offered with hot-temperature thresholds (+35°C to +125°C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45°C to +15°C), asserting when the temperature is below the threshold.

The MAX6501–MAX6504 are offered in eight standard temperature versions; contact the factory for pricing and availability of nonstandard temperature versions. They are available in 5-pin SOT23 package.

MAX6501, MAX6502, MAX6503, MAX6504: Typical Operating Circuit Enlarge+

Key Features

• ±0.5°C (typical) Threshold Accuracy Over Full Temperature Range
• No External Components Required
• Low Cost
• 30µA Supply Current
• Factory-Programmed Thresholds from -45°C to +125°C in 10°C Increments
• Open-Drain Output (MAX6501/MAX6503) Push-Pull Output (MAX6502/MAX6504)
• Pin-Selectable 2°C or 10°C Hysteresis
• SOT23-5 Package

Applications/Uses

• µP Temperature Monitoring in High-Speed Computers
• Fan Control
• Temperature Alarms
• Temperature Control