AQ265 ACUTECH | Alldatasheet

Document overview

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Technical content

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

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 2 Rev. 1.5 January 31, 2007 Pin Configuration Pin Descriptions Pin num Pin Name Function

1 COLD

ADJ 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, V DSS when thermal threshold is reached.

Ordering Information

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.

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 3 Rev. 1.5 January 31, 2007 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 reli ability. 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 Storage Temperature Range -65 to +150 ºC 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 Conditions Min Typ Max Units IVCC Input Current 20 30 µA IVCC Input Current Tj outside trip temperatures 20 30 µA VCC Input Voltage 2.4 16 V VOUT Output on VOUT IOUT = 100µA, Tj outside the trip temperatures 0.15 0.25 V IOUT Output on IOUT VOUT = 2.2V, Tj outside the trip temperatures 100 350 600 µA IOUT Output leakage current VCC = 16V, Tj inside the trip temperatures 0.2 0.4 µA OTT Hot temp Threshold Unadjusted Tj = 37 40 43 ºC OTR Hot temp range Adjusted by resistor (1) Tj = 40 90 ºC HOT Hysteresis -5 ºC UTT Cold temp Threshold Tj = -23 -20 -17 ºC UTR Cold temp range Adjusted by resistor (2) Tj = -20 15 ºC HUT Hysteresis +3 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 tem perature email required temperature to info@acutechnology.com

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 4 Rev. 1.5 January 31, 2007 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 info@acutechnology.com RSET vs Hot Thresh. 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 RSET in Kohms Temperature C GRAPH.1

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 5 Rev. 1.5 January 31, 2007 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 info@acutechnology.com. RSET vs Lower Thresh. -15.0 -10.0 -5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 500 700 900 1100 1300 1500 1700 1900 RSET in Kohms Temperature C 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. V 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, V OUT 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.

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 6 Rev. 1.5 January 31, 2007 GRAPH.3 GRAPH.4

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 7 Rev. 1.5 January 31, 2007 Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6

Acutechnology Semiconductor Inc. AQ265 www.acutechnology.com 8 Rev. 1.5 January 31, 2007 Contact Information Acutechnology Semiconductor Inc. TEL: (408) 259-2300 3487 McKee Rd. Suite 52 FAX: (408) 259-9160 San Jose CA , USA 95127 website: www.acutechnology.com Disclaimer The information furnished by Acutechnology in this data s heet 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 ex pected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended fo r surgical implant into the body or (b) support or sustain life, and whose failure t o perform can be reasonably expected to result in a significant injury to the user.