LM27A NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 10
Technical content
Features
■ Internal comparator with pin selectable 2°C or 10°C hysteresis ■ No external components required ■ Open-drain or push-pull digital output; supports CMOS logic levels ■ Internal temperature sensor with VTEMP output pin ■ VTEMP output allows after-assembly system testing ■ Internal voltage reference and DAC for trip-point setting ■ Excellent power supply noise rejection ■ AEC-Q100 Qualified Key Specifications ■ Power Supply Voltage 2.7V to 5.5V ■ Power Supply Current 40µA(max) 15µA(typ) ■ Hysteresis Temperature 2°C or 10°C(typ) ■ Temperature Trip Point Accuracy ±3°C (max) © 2007 National Semiconductor Corporation 201530 www.national.com LM27A SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset Thermostat (LM27 in Die Form)
Ordering Information
For more detailed information on the suffix meaning see the part number template at the end of the Electrical Characteristics Section. Contact National Semiconductor for other set points and output options. Order Number NS Package Number Trip Point Setting Output Function Transport Media LM27-2PL MDA Die form, no package 145°C Push-Pull (OS) Open-Drain (OS) 400 units in waffle trays Connection Diagram LM27A Bond Pad Layout 20153002 TOP VIEW 1130µm x 902µm Bond Pad Mechanical Dimensions Dimensions of bond pad coordinates are in micrometers. Origin of coordinates: center of die. X-Direction is in the longitudinal axis of the die. Coordinates refer to center of Bond Pad. Opening sizes for bond pads 1 through 6 are 85 µm × 85 µm. Pin# X Y 1 –437 µm +225 µm 2 –437 µm 0 3 –437 µm –220 µm 4 +437 µm –220 µm 5 +437 µm +5 µm 6 +437 µm +225 µm BACK www.national.com 2 LM27A
Pin Number Pin Name Function Connection
1 HYST Hysteresis control, digital input GND for 10°C or V+ for 2°C
(Note 8) OS Overtemperature Shutdown push- pull active-high thermostat digital output Controller interrupt, system or power supply shutdown US Undertemperature Shutdown push- pull active-high thermostat digital output System or power supply shutdown (Note 8) OS Overtemperature Shutdown open- drain active-low thermostat digital output Controller interrupt, system or power supply shutdown; pull-up resistor ≥ 10kΩ US Undertemperature Shutdown open- drain active low thermostat digital output System or power supply shutdown; pull-up resistor ≥ 10kΩ 4 V+ Supply input 2.7V to 5.5V with a 0.1µF bypass capacitor. For PSRR information see Section Titled NOISE CONSIDERATIONS.
5 GND Power supply ground System ground
6 VTEMP Analog output voltage proportional to
Leave floating or connect to a high impedance node. 7 - 14 NC Do not connect BACK Backside Can go to GND connection (Note: GND must be connected. The back is not a system ground connection). Note: Only connect to one of the output pads, Pad 2 or Pad 3, not both. Either push-pull (Pad 2) or open-drain (Pad 3) can be used but they can not both be used on the same die. 3 www.national.com LM27A
Absolute Maximum Ratings (Note 1) Input Voltage 6.0V Input Current at any pin (Note 2) 5mA Package Input Current(Note 2) 20mA Storage Temperature −65°C to + 175°C ESD Susceptibility (Note 3) Human Body Model Machine Model 2500V 250V Operating Ratings (Note 1) Specified Temperature Range TMIN ≤ TA ≤ TMAX LM27A −40°C ≤ TA ≤ +150°C Positive Supply Voltage (V+) +2.7V to +5.5V Maximum VOUT +5.5V The following specifications apply for V+ = 2.7VDC to 5.5VDC, and VTEMP load current = 0µA unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C unless otherwise specified. Typical LM27A Units Symbol Parameter Conditions (Note 4) Limits (Limits) (Note 5) Temperature Sensor Trip Point Accuracy (Includes VREF, DAC, Comparator Offset, and Temperature Sensitivity errors) +120°C<TA<+150°C ±3 °C (max) Trip Point Hysteresis HYST = GND 10 °C HYST = V+ 2 °C VTEMP Output Temperature Sensitivity −10.82 mV/°C VTEMP Temperature Sensitivity Error to Equation: 1.8386V 2.7V ≤ V+ ≤ 5.5V ±3 °C (max) 4.5V ≤ V+ ≤ 5.5V ±3 °C (max) TA = 25°C ±2.5 °C (max) VTEMP Load Regulation Source ≤ 1 μA 0.070 mV Sink ≤ 40 μA 0.7 mV (max) VTEMP Line Regulation +2.7V ≤ V+ ≤ +5.5V, −0.2 mV/V IS Supply Current 15 22 µA (max) µA (max) Digital Output and Input IOUT(“1”) Logical “1” Output Leakage Current (Note V+ = +5.0V 0.001 1 µA (max) VOUT(“0”) Logical “0” Output Voltage IOUT = +1.2mA and V+≥2.7V; IOUT = +3.2mA and V+≥4.5V; (Note 6)
0.4 V (max)
VOUT(“1”) Logical “1” Push-Pull Output Voltage ISOURCE = 500µA, V+ ≥ 2.7V 0.8 × V+ V (min) ISOURCE = 800µA, V+≥4.5V V+ − 1.5 V (min) VIH HYST Input Logical ”1“ Threshold Voltage 0.8 × V+ V (min) VIL HYST Input Logical ”0“ Threshold Voltage 0.2 × V+ V (max) tEN tENABLE: Time from Power-On to Digital Output (OS or OS) Enabled VDD = 3.3V ±5% 350 µs (min) www.national.com 4 LM27A
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI < GND or VI > V+), the current at that pin should be limited to 5mA. The 20mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5mA to four. Under normal operating conditions the maximum current that pins 2, 4 or 5 can handle is limited to 5mA each. Note 3: The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 4: Typicals are at TJ = TA = 25°C and represent most likely parametric norm. Note 5: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level). Note 6: Care should be taken to include the effects of self heating when setting the maximum output load current. Self heating is not included in the trip point accuracy specification. Note 7: The 1µA limit is based on a testing limitation and does not reflect the actual performance of the part. Expect to see a doubling of the current for every 15°C increase in temperature. For example, the 1nA typical current at 25°C would increase to 16nA at 85°C. Note 8: Only connect to one of the output pads, number 2 or number 3, not both. Either push-pull (Pad 2) or open-drain (Pad 3) can be used but they can not both be used on the same die. Part Number Template The series of digits labeled xyz in the part number LM27-xyz MDA, describe the set point value and the function of the output as follows: The place holders xy describe the set point temperature as shown in the following table. x (10x) y (1x) Temperature (°C) - H 0 - J 1 - K 2 - L 3 - N 4 - P 5 - R 6 x (10x) y (1x) Temperature (°C) - S 7 - T 8 - V 9 Z - 12 1 - 13 2 - 14 3 - 15 The value of z describes the assignment/function of the output as shown in the following table: Value of z Digital Output Function L Overtemperature shutdown: active-high OS output or active-low OS output N Undertemperature shutdown: active-high US or active-low US output. For example:
- The part number LM27-2SL MDA would have TOS = 147°C, and is programmed as an overtemperature shutdown output.
- The part number LM27-ZLN MDA would have TUS = 123°C, and is programmed as an undertemperature shutdown output. Active-high open-drain and active-low push-pull options are available, please contact National Semiconductor for more information. 5 www.national.com LM27A
number LM27-2HJ MDA, which would have a 140°C trip point.
- Turn on V+ and measure VTEMP. Then calculate the
- Verify that the temperature measured in step one is
C. Observe that OS is now low. E. Observe that OS is now high. B. Drive VTEMP voltage down gradually. C. When OS goes low, note the VTEMP voltage. E. Calculate Ttrig using Equation 2. B. Calculate THYST using Equation 2. a factor of 10 smaller than CLOAD. TABLE 1. Resistive compensation for capacitive loading FIGURE 1. Resistor placement for capacitive loading
- square wave 400kHz, 1Vp-p
- square wave 2kHz, 200mVp-p
- sine wave 100Hz to 1MHz, 200mVp-p Testing was done while maintaining the temperature of the LM27A one degree centigrade way from the trip point with the output not activated. www.national.com 6 LM27A
9 www.national.com LM27A
LM27A SOT-23, ±3°C Accurate, 120°C-150°C Factory Preset Thermostat (LM27 in Die Form) THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2007 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +49 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com