CONFIDENTIAL AQ265 Adjustable Hot- Cold Thermostat SOT23-5 Package Preliminary Specification Revision 1.5 General Description Specifically design to reside in battery packs, the device AQ265 is used to stop the charge or discharge of a battery when the battery temperature is outside of the safe temperature range. The AQ265 is an accurate low-power solid-state thermostat that provides shut down alarm at both cold and hot temperatures. It features very low standby current, which prolongs battery shelf life. The hot temperature trip point is 40ºC and can be adjusted with one external resistor from 40ºC to 90ºC. The cold trip point is -20ºC and can be adjusted with one external resistor from -20ºC to 15ºC. Thermal hysteresis is internally programmed to guarantee stability at the transition points. At temperatures between its hot and cold trip points, the AQ265 lies quietly with open drain while drawing ICC of only 20µA. When either the hot or cold threshold temperature is reached the OUT pin will sink >200µA providing a low power signal to disconnect the battery from its load and/or charger. January 31, 2007 Applications • • Battery Packs and Chargers Electronic System protection Features • • • • • • • 20µA off state current, prolongs battery shelf life +/-3 degrees Celsius accuracy Adjustable Hot and cold temperature trip points Internally programmed thermal hysteresis Excellent power supply noise rejection Offered in very small SOT23-5 package. RoHS Compliant Block Diagram www.acutechnology.com AQ265 AQ265 Acutechnology Semiconductor Inc. Pin Configuration Pin Descriptions Pin num 1 Pin Name COLD ADJ Function Adjust pin, connects to lower temperature adjust resistor 2 GND Ground 3 HOT ADJ Adjust pin, connects to high temperature adjust resistor 4 VCC V supply. Must be greater than 2.4V for normal operation. 5 OUT Normally Open Drain, VDSS when thermal threshold is reached. Ordering Information Device Operating Tj Hot TTHRESH RANGE Cold TTHRESH RANGE Tol. PKG Type Wrap Ordering Number AQ265 -55ºC ≤ 150ºC 40 < 90ºC -20 < 15ºC ± 3ºC SOT-23-5 T&R AQ265GY-M5-AJ-TRL Note: The TRL parts are Lead Free and RoHS compliant. www.acutechnology.com 2 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. 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 Value Units VCC Voltage 18 V VOUT Voltage 18 V IOUT Current 10 mA Cold ADJ Current 10 mA Hot ADJ Current 10 mA Operating Junction Temperature 155 ºC Lead Temperature (soldering 10 seconds) 260 ºC -65 to +150 ºC Storage Temperature Range Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -55ºC <Tj<150ºC unless otherwise stated. Ambient temperature must be de-rated based upon power dissipation and package thermal characteristics. Unless otherwise specified: VCC = 5V COLD ADJ = HOTADJ = no connect, Tj =25ºC Symbol Parameter IVCC Input Current IVCC Input Current VCC Input Voltage Conditions Min Tj outside trip temperatures 100 Output leakage current Hot temp Threshold Unadjusted Tj = 37 Tj = 40 Output on VOUT IOUT Output on IOUT IOUT OTT OTR Hot temp range HOT Hysteresis UTT Cold temp Threshold UTR Cold temp range HUT Hysteresis Max Units 20 30 µA 20 30 µA 16 V 0.15 0.25 V 350 600 µA 0.2 0.4 µA 40 43 ºC 90 ºC 2.4 IOUT = 100µA, Tj outside the trip temperatures VOUT = 2.2V, Tj outside the trip temperatures VCC = 16V, Tj inside the trip temperatures VOUT Typ Adjusted by resistor (1) -5 Adjusted by resistor (2) Tj = -23 Tj = -20 -20 +3 ºC -17 ºC 15 ºC ºC Notes: 1) The over temperature trip point is adjusted with a resistor from HOT ADJ to GND (see graph 1) 2) The under temperature trip point is adjusted with a resistor from COLD ADJ to GND (see graph 2) 3) For an accurate RSET to adjust temperature email required temperature to [email protected] www.acutechnology.com 3 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. Typical Application The device AQ265 is very simple to use. It is recommended to place the AQ265 in close proximity of the device whose temperature is to be sensed. The device AQ265 has an open drain output, which is capable of sinking greater than 200µA when the sensed temperature exceeds the Hot temp trip point or goes below the Cold temp trip point. The Hot and Cold temperature trip points can be set by the addition of external resistors RSET as depicted in FIG.1 below. 1nF capacitors must be placed from the adjust pins to ground close to the AQ265 for noise immunity. FIG.1 SETTING THE HOT TEMPERATURE TRIP POINT 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. To determine the desired Hot temperature trip point, the resistor RSET value should be selected according to the graph below. The graph shows the desired resistor value for the temperature range between 50ºC and 85ºC. If no external resistor is selected, the Hot temperature trip point will be 40ºC. For an accurate RSET email [email protected] RSET vs Hot Thresh. 90.0 Temperature C 85.0 80.0 75.0 70.0 65.0 60.0 55.0 50.0 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 RSET in Kohms GRAPH.1 www.acutechnology.com 4 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. SETTING THE COLD TEMPERATURE TRIP POINT 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. To determine the desired Cold temperature trip point, the resistor RSET value should be selected according to the graph below. The graph shows the desired resistor value for the temperature range between -10ºC and 10ºC. If no external resistor is selected the Cold temperature trip point will be -20ºC. For an accurate RSET email [email protected]. RSET vs Lower Thresh. 30.0 25.0 Temperature C 20.0 15.0 10.0 5.0 0.0 -5.0 -10.0 -15.0 500 700 900 1100 1300 1500 1700 1900 RSET in Kohms GRAPH.2 The AQ265 is designed to present the lowest possible current drain to the battery. ICC is less than 30µA under all conditions. OUT pin is designed to pull down with a minimum of 200µA. To insure the desired low state output voltage, the current required to pull down the element used to disconnect the Battery must be determined and is referred to as I load. Selection of the R1 pull up resistor must allow for I load when the OUT engages into the alarm state, meaning the device is sensing temperatures outside of its set temperature window. The OT pin is guaranteed to sink a minimum of 100µA to keep the current drain as low as possible. Therefore, I load plus I R1 must not exceed 100µA or a true logic low may not be achieved when the AQ265 alarms an out of window temperature has been sensed. R1= (Vbatt. min - Max. VOUTon) / (Min. IOUTon – (1.5* I load)) = (Vbatt. min - 0.25V) / (100µA – (1.5* I load)) Graph 3 below shows the hysteretic response of the OUT pin to temperature. In the normal range between the Cold and Hot trip points, the AQ265 presents an open Drain high state at the OUT pin. At the cold temperature trip point, VOUT will drop to its low state. The OUT pin will return to a high state when the AQ265 senses the temperature has risen above the Cold trip point by + 3 degrees of hysteresis. Likewise, the AQ265 will cause the OUT pin to go low state when the Hot temperature trip point is exceeded. OUT will return to high state when the AQ265 senses that the temperature is below the high trip point by - 5 degrees of hysteresis. Graph 4 shows the input current into the AQ265 and output state over the temperature range. www.acutechnology.com 5 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. GRAPH.3 GRAPH.4 www.acutechnology.com 6 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 7 Rev. 1.5 January 31, 2007 AQ265 Acutechnology Semiconductor Inc. Contact Information Acutechnology Semiconductor Inc. 3487 McKee Rd. Suite 52 San Jose CA , USA 95127 TEL: (408) 259-2300 FAX: (408) 259-9160 website: www.acutechnology.com 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. 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 8 Rev. 1.5 January 31, 2007