 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| CONFIDENTIAL AQ265 Adjustable Hot- Cold Thermostat SOT23-5 Package Preliminary Specification Revision 1.5 January 31, 2007 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 40C and can be adjusted with one external resistor from 40C to 90C. The cold trip point is -20C and can be adjusted with one external resistor from -20C to 15C. 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 20A. When either the hot or cold threshold temperature is reached the OUT pin will sink >200A providing a low power signal to disconnect the battery from its load and/or charger. Applications * * Battery Packs and Chargers Electronic System protection Features * * * * * * * 20A 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 Acutechnology Semiconductor Inc. AQ265 Pin Configuration Pin Descriptions Pin num 1 2 3 4 5 Pin Name COLD ADJ GND HOT ADJ VCC OUT Function Adjust pin, connects to lower temperature adjust resistor Ground Adjust pin, connects to high temperature adjust resistor V supply. Must be greater than 2.4V for normal operation. Normally Open Drain, VDSS when thermal threshold is reached. Ordering Information Device AQ265 Note: The Operating Tj -55C 150C Hot TTHRESH RANGE 40 < 90C Cold TTHRESH RANGE -20 < 15C Tol. 3C PKG Type SOT-23-5 Wrap T&R Ordering Number AQ265GY-M5-AJ-TRL TRL parts are Lead Free and RoHS compliant. www.acutechnology.com 2 Rev. 1.5 January 31, 2007 Acutechnology Semiconductor Inc. AQ265 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 VOUT Voltage IOUT Current Cold ADJ Current Hot ADJ Current Operating Junction Temperature Lead Temperature (soldering 10 seconds) Storage Temperature Range Value 18 18 10 10 10 155 260 -65 to +150 Units V V mA mA mA C C C Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -55C Conditions Min Typ 20 Max 30 30 16 Units A A V V A A C C C IVCC IVCC VCC VOUT IOUT IOUT OTT OTR HOT UTT UTR HUT Tj outside trip temperatures 2.4 20 0.15 100 350 0.2 37 40 -5 -20 40 0.25 600 0.4 43 90 Tj = Tj = -17 15 C C C 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 info@acutechnology.com www.acutechnology.com 3 Rev. 1.5 January 31, 2007 Acutechnology Semiconductor Inc. AQ265 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 200A 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 50C and 85C. If no external resistor is selected, the Hot temperature trip point will be 40C. For an accurate RSET email info@acutechnology.com RSET vs Hot Thresh. 90.0 85.0 Temperature C 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 Acutechnology Semiconductor Inc. AQ265 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 -10C and 10C. If no external resistor is selected the Cold temperature trip point will be -20C. For an accurate RSET email info@acutechnology.com. RSET vs Lower Thresh. 30.0 25.0 20.0 Temperature C 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 30A under all conditions. OUT pin is designed to pull down with a minimum of 200A. 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 100A to keep the current drain as low as possible. Therefore, I load plus I R1 must not exceed 100A 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) / (100A - (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 Acutechnology Semiconductor Inc. AQ265 GRAPH.3 GRAPH.4 www.acutechnology.com 6 Rev. 1.5 January 31, 2007 Acutechnology Semiconductor Inc. AQ265 Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.acutechnology.com 7 Rev. 1.5 January 31, 2007 Acutechnology Semiconductor Inc. AQ265 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 8 Rev. 1.5 January 31, 2007 |
Price & Availability of AQ265GY-M5-AJ-TRL
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |