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| LDS297P 3C Accurate with Hysteresis Adjustable Thermostat Product Specification Revision 1.4 SOT23-5 Package May 20, 2008 General Description The device LDS297P is an adjustable accurate lowpower solid-state thermostat. The temperature trip point can be set with one external resistor from 50C to 150C with an accuracy of 3 degrees. The thermal hysteresis is internally programmed to guarantee stability at the transition point. The device LDS297P is used to protect systems from overheating above the normal rating of components like capacitors, batteries, or any other temperature sensitive component. The device LDS297P 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.leadis.com 1 Rev. 1.4 May 20, 2008 Leadis Technology Inc. LDS297P 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 www.leadis.com 2 Rev. 1.4 May 20, 2008 Leadis Technology Inc. LDS297P Absolute Maximum Ratings Stress greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are 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 C C C Electrical Specifications Electrical characteristics are guaranteed over the full temperature range -55C IVCC IVCC VCC VOT IOT OTT TOT HOT Notes: www.leadis.com 3 Rev. 1.4 May 20, 2008 Leadis Technology Inc. LDS297P Typical Application The device LDS297P is very simple to use. It is recommended to place the LDS297P in close proximity of the device whose temperature is to be sensed. The device LDS297P 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 50C and 80C. If no external resistor is selected the temperature trip point will be 120C. 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.leadis.com 4 Rev. 1.4 May 20, 2008 Leadis Technology Inc. LDS297P Package Dimensions SOT23-3, SOT23-4, SOT23-5, SOT23-6 www.leadis.com 5 Rev. 1.4 May 20, 2008 Leadis Technology Inc. LDS297P Ordering Information Device LDS297P Note: Operating Tj -55C ! 150C Initial TTHRESH 120C Adjusted TTHRESH 50-150C Tol. " 3C PKG Type SOT-23-5 Wrap T&R Ordering Number LDS297GY-M5-AJ-TL 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: 297LDS Revision: 1.4 Issue date: 5/20/08 www.leadis.com 6 Rev. 1.4 May 20, 2008 |
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