AQ297

AQ297 3ºC Accurate with Hysteresis Adjustable Thermostat SOT23-5 Package Product Specification Revision 1.1 October 08, 2006 General Description The device AQ297 is an adjustable accurate lowpower solid-state thermostat. The temperature trip point can be set with one external resistor from 50ºC to 150ºC with an accuracy of 3 degrees. The thermal hysteresis is internally programmed to guarantee stability at the transition point. The device AQ297 is used to protect systems from overheating above the normal rating of components like capacitors, batteries, or any other temperature sensitive component. The device AQ297 is also used in battery management systems to stop the battery charge when the battery temperature is outside of the safe temperature range. The output OT is an open drain output that can sink up to 50mA when the threshold temperature is reached. The minimum voltage of operation is 2.2 V. Applications • • • • • • • • • • • • • Battery Chargers Electronic System protection Fan Control Microprocessor Thermal Management HVAC Systems Features +/-3 degrees Celsius accuracy Adjustable temperature trip point Open-drain output capable of 50mA Internally programmed thermal hysteresis Low input voltage and current Excellent power supply noise rejection Offered in very small SOT23-5 package. RoHS Compliant Block Diagram www.acutechnology.com AQ297 Acutechnology Semiconductor Inc. AQ297 Pin Configuration Pin Descriptions Pin num 1 2 3 4 5 Pin Name TREF GND TADJ VCC OT Ground Adjust pin, connects to temperature adjust resistor V supply. Must be greater than 2.2V for normal operation. Normally Open Drain, VDSS when thermal threshold is reached. Function Reference connects to temperature adjust resistor Ordering Information Device AQ297 AQ297 Operating Tj -55ºC ≤ 150ºC -55ºC ≤ 150ºC Initial TTHRESH 120ºC 120ºC Adjusted TTHRESH 50-150ºC 50-150ºC Tol. ± 3ºC PKG Type SOT-23-5 SOT-23-5 Wrap T&R T&R Ordering Number AQ297GY-M5-AJ-TR AQ297GY-M5-AJ-TRL ± 3ºC Note: The TRL parts are Lead Free and RoHS compliant. www.acutechnology.com 2 Rev. 1.1 October 08, 2006 Acutechnology Semiconductor Inc. AQ297 Absolute Maximum Ratings Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These stress ratings only, and functional operation of the device at these or any conditions beyond those indicated under recommended Operating Conditions is not implied. Exposure to “Absolute Maximum Rating” for extended periods may affect device reliability. Use of standard ESD handling precautions is required. Parameter VCC Voltage VOT Voltage IOT Current ITREF Current ITADJ Current Operating Junction Temperature Lead Temperature (soldering 10 seconds) Storage Temperature Range Value 18 18 80 10 10 155 260 -65 to +150 Units V V mA mA mA ºC ºC ºC Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -55ºC trip temperature 2.2 0.15 0.2 120 Conditions Min Typ 80 1.5 Max 120 2.0 16 0.25 0.4 123 3 Units µA mA V V µA ºC ºC ºC IVCC IVCC VCC VOT IOT OTT TOT HOT Notes: www.acutechnology.com 3 Rev. 1.1 October 08, 2006 Acutechnology Semiconductor Inc. AQ297 Typical Application The device AQ297 is very simple to use. It is recommended to place the AQ297 in close proximity of the device whose temperature is to be sensed. The device AQ297 has an open drain output which is capable of sinking up to 50mA when the sensed temperature exceeds the trip point. The temperature trip point can be set by the addition of an external resistor RSET between the TREF and the TADJ pins as depicted in FIG.1 below. FIG.1 It is assumed that the temperature coefficient of the external resistor be close to zero as it commonly is. Higher accuracy resistors guarantee higher accuracy temperature trip point. The resistor RSET value should be selected according to the table below to determine the desired temperature trip point. The table in particular shows the desired resistor value for the temperature range between 50ºC and 80ºC. If no external resistor is selected the temperature trip point will be 120ºC. RSET vs Tthresh. 90.0 85.0 80.0 Temperature C 75.0 70.0 65.0 60.0 55.0 50.0 45.0 40.0 70.0 90.0 110.0 130.0 150.0 170.0 190.0 210.0 RSET in Kohms www.acutechnology.com 4 Rev. 1.1 October 08, 2006 Acutechnology Semiconductor Inc. AQ297 Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 5 Rev. 1.1 October 08, 2006 Acutechnology Semiconductor Inc. AQ297 Contact Information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA , USA 95127 Disclaimer The information furnished by Acutechnology in this data sheet is believed to be accurate and reliable. However, Acutechnology assumes no responsibility for its use. Acutechnology reserves the right to change circuitry and specifications at any time without notification to the customer. TEL: (408) 259-2300 FAX: (408) 259-9160 website: www.acutechnology.com Life Support Policy Acutechnology Products are not designed or authorized for use as components in life support devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. www.acutechnology.com 6 Rev. 1.1 October 08, 2006