 |
|
| 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: |
| LDS265P Adjustable Hot- Cold Thermostat Preliminary Specification Revision 1.7 SOT23-5 Package February 08, 2008 General Description Specifically design to reside in battery packs, the device LDS265P is used to stop the charge or discharge of a battery when the battery temperature is outside of the safe temperature range. The LDS265P 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 -17C and can be adjusted with one external resistor from -17C to 25C. Thermal hysteresis is internally programmed to guarantee stability at the transition points. At temperatures between its hot and cold trip points, the LDS265P 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.leadis.com 1 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P 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. www.leadis.com 2 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P 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 22 22 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 22 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 32 36 -5 -17 35 0.25 600 0.4 37 90 Tj = Tj = -14 25 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 sales@leadis.com. www.leadis.com 3 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P Typical Application The device LDS265P is very simple to use. It is recommended to place the LDS265P in close proximity of the device whose temperature is to be sensed. The device LDS265P 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 LDS265P 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 35C. For an accurate RSET email sales@leadis.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.leadis.com 4 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P 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 -17C. For an accurate RSET email sales@leadis.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 LDS265P 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 LDS265P 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 LDS265P 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 LDS265P senses the temperature has risen above the Cold trip point by + 3 degrees of hysteresis. Likewise, the LDS265P 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 LDS265P senses that the temperature is below the high trip point by - 5 degrees of hysteresis. www.leadis.com 5 Rev. 1.7 February 08, 2008 Leadis Technology Inc. Graph 4 shows the input current into the LDS265P and output state over the temperature range. LDS265P GRAPH.3 www.leadis.com 6 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P GRAPH.4 Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.leadis.com 7 Rev. 1.7 February 08, 2008 Leadis Technology Inc. LDS265P Ordering Information Device LDS265P Operating Tj Hot TTHRESH RANGE Cold TTHRESH RANGE -17 < 25C Tol. 3C PKG Type SOT-23-5 Wrap T&R Ordering Number LDS265GY-M5-AJ-TL -55C 35 < 90C 150C Note: Lead Free and RoHS compliant. Warranty and Use LEADIS TECHNOLOGY MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Leadis Technology products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Leadis Technology product could create a situation where personal injury or death may occur. Leadis Technology reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Leadis Technology advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Leadis Technology 800 W. California Ave, Suite 200 Sunnyvale, CA 94086 Phone: 408.331.8600 Fax: 408.331.8601 http://www.leadis.com Document No: 265LDS Revision: 1.7 Issue date: 2/08/08 www.leadis.com 8 Rev. 1.7 February 08, 2008 |
Price & Availability of LDS265GY-M5-AJ-TL
 |
|
|
|
|
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] |