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| SEMICONDUCTOR AS300 Shunt Temperature Sensor Description The AS300 is a two-terminal integrated circuit temperature sensor. It is a precision-trimmed shunt type regulator that emulates a zener diode in function. Its output voltage is linearly proportional to temperature in Kelvin. The output voltage is calibrated for 3.000 V at 27C (300 K) and increases by 10 mV/C. The AS300 is available in four packages.The SOT-223 offers a large heat-sink for transferring heat to the die for fast and accurate thermal sensing. The SOT-223 is especially effective at sensing the temperature of hybrid and MCM substrates. The SOT-23 is best-suited for applications requiring a small footprint or precision force/sense metering. Features Calibrated directly in Kelvin Linear 10 mV/C scale factor 1C typical accuracy at 27C (300 K) Fully rated for 40 to 125C (233 to 398 K) Suitable for remote applications Low-impedance output, 0.3 1/2 for a 1 mA load Now available in the SOT-223 for improved substrate temperature sensing Pin Configuration N Top view TO-92 (LP) SOT-223 (G) VTEMP VTEMP GND (F) GND (S) GND (F) GND (S) SOIC (D) SOT-23/3L (VS) GND (S) GND (F) N/C N/C 1 2 3 4 8 7 6 5 N/C N/C GND VTEMP (F) GND VTEMP (F) VTEMP Ordering Information AS300 Circuit Type: Shunt Temperature Sensor LP A Packaging Option: A = Ammo Pack B = Bulk T = Tube 7 = Tape and Reel (7" Reel Dia) 13 = Tape and Reel (13" Reel Dia) Package Style: D = SOIC G = SOT-223 LP = TO-92 VS = SOT-23/3L ASTEC Semiconductor 1 AS300 Functional Block Diagram VTEMP Shunt Temperature Sensor + - + - 10 mV/C GND Pin Function Description Pin Number TO, SOT 1 2 3 SOIC 1 2 6 5 Function GND (S) GND (F) VTEMP (F) VTEMP (S) Description Optional sense pin ground, otherwise tie to substrate pin GND (F). Signal ground and circuit substrate. Output voltage proportional to temperature. VTEMP is nominally 3.00 V at 27C (300 K) and increases at 10 mV/C. Optional sense pin for VTEMP. Available on the 8L SOIC package only. Tie pin to VTEMP (F) if not using force/sense metering. Absolute Maximum Ratings Parameter Supply Current Continuous Power Dissipation at 25C TO-92 SOT-223 8L SOIC SOT-23/3L Junction Temperature Operating Temperature Storage Temperature Lead Temp, Soldering 10 Seconds TSTG TL TJ Symbol IREF PD 775 1250 750 200 150 40 to 125 65 to 150 300 mW mW mW mW C C C C Rating 20 Unit mA Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. ASTEC Semiconductor 2 Shunt Temperature Sensor Typical Thermal Resistances Package TO-92 SOT-223 8L SOIC SOT-23/3L JA 160C/W 115C/W 175C/W 575C/W JC 80C/W 8C/W 45C/W 150C/W AS300 Typical Derating 6.3 mW/C 8.7 mW/C 5.7 mW/C 1.7 mW/C Electrical Characteristics Electrical Characteristics are guaranteed over the full junction temperature range (40 to 125C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Parameter Output Voltage Symbol VTEMP VTEMP Temperature Coefficient Error Minimum Operating Current Output Impedance IK(min) ZKA IK = 0.6 to 5.5 mA 0.3 Test Condition IK = 2 mA, TJ = 27C (300 K) IK = 2 mA, TJ = 100C (373 K) IK = 2 mA, deviation from 10 mV/C Min. 2.970 3.690 Typ. 3.000 3.730 40 0.6 2 Max. 3.030 3.770 Unit V V V/C mA 1/2 Test Circuit VIN IK VTEMP Figure 1 ASTEC Semiconductor 3 AS300 Typical Performance Curves Shunt Temperature Sensor 5.0 IK = 2 mA 4.5 VTEMP - Output Voltage (V) 4.0 3.5 3.0 2.5 2.0 1.5 -50 Output Voltage Forward Characteristics 0.7 TJ = 27C 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.1 0.01 -25 250 0 25 50 75 300 350 T - Temperature 100 125 400 (C) (K) VF - Forward Voltage (V) 0.1 1.0 10 100 IF - Forward Current (A) Figure 2 Figure 3 Thermal Response by Package in Still Air 120 SOT-223 100 Percent of Thermal Equilibrium (%) Percent of Thermal Equilibrium (%) 100 120 Thermal Response by Package in a Stirred Oil Bath SOT-223 80 TO-92 60 80 TO-92 8L SOIC 60 40 8L SOIC 20 40 20 0 0 4 8 12 Time (s) 16 20 24 0 0 2 4 6 Time (s) 8 10 12 Figure 4 Figure 5 ASTEC Semiconductor 4 Shunt Temperature Sensor Typical Performance Curves AS300 Operating Characteristics 1.50 27C 1.25 IK - Reverse Current (mA) IK - Reverse Current (A) 1k 10k Operating Characteristics 27C 0C 100 1.00 0C 100C 0.75 10 0.50 0.25 100C 0 0 1 2 3 VTEMP - Output Voltage (V) 4 1.0 0 0 1 2 3 VTEMP - Output Voltage (V) 4 Figure 6 Figure 7 Dynamic Impedance 1k TJ = 27C IK = 2 mA 100 Input and Output Voltage (V) ZK - Output Impedance () 2 4 TJ = 27C 3 Transient Response OUTPUT 1k 1 0 VIN VOUT 10 1.0 5 INPUT 0.1 0.01 0.01 0 0.1 1.0 10 10 1k 0 25 50 t - Time (s) 500 600 f - Frequency (kHz) Figure 8 Figure 9 ASTEC Semiconductor 5 AS300 Typical Applications Shunt Temperature Sensor Linear Fan Controller 15 V 9V Fahrenheit Thermometer 9.1k 15k 20k M 12 VDC, 120 mA Brushless Fan 5k 100 A Full Scale Analog Meter + LM358 R1 A R2 AS1004-1.2 2N2907 AS300 AS431 AS300 500 130k Adjust R1 to set 0F reading (120k) Adjust R2 to set 100F reading (2.7k) Figure 10 Figure 11 Linear Fan Controller 1.2 V Thermostat VCC M 10k 91k 10k + LM358 AS300 34k IRF233 + LM339 AS300 R3 120k 12 VDC, 120 mA Brushless Fan R1 R2 1 nF Figure 12 Figure 13 ASTEC Semiconductor 6 |
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