GENERAL DESCRIPTION

The AD22105 is a solid state thermostatic switch. Requiring only one external programming resistor, the AD22105 can be set to switch accurately at any temperature in the −40°C to +150°C wide operating range. Using a novel circuit architecture, the AD22105 asserts an open-collector output when the ambient temperature exceeds the user-programmed setpoint temperature. The AD22105 has approximately 4°C of hysteresis, which prevents rapid thermal on and off cycling.

FEATURES

User-programmable temperature setpoint

±2.0°C maximum ambient setpoint accuracy

4.1°C typical hysteresis

Wide supply range: 2.7 V to 7.0 V

Wide temperature range: −40°C to +150°C

Low power dissipation

APPLICATIONS

Industrial process control

Thermal control systems

CPU monitoring

Computer thermal management circuits

Fan control

Handheld/portable electronic equipment