AS300 Shunt Temperature Sensor SEMICONDUCTOR Features Description Calibrated directly in Kelvin Linear 10 mV/¡C scale factor 1¡C typical accuracy at 27¡C (300 K) Fully rated for Ð40 to 125¡C (233 to 398 K) ¥ Suitable for remote applications ¥ Low-impedance output, 0.3 ½ for a 1 mA load ¥ Now available in the SOT-223 for improved substrate temperature sensing 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 27¡C (300 K) and increases by 10 mV/¡C. ¥ ¥ ¥ ¥ Pin Configuration Ñ 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. Top view TO-92 (LP) SOT-223 (G) VTEMP VTEMP GND (F) GND (F) GND (S) GND (S) SOIC (D) SOT-23/3L (VS) GND (S) 1 8 N/C GND (F) 2 7 N/C N/C 3 6 VTEMP (F) N/C 4 5 VTEMP (F) VTEMP GND GND Ordering Information AS300 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) Circuit Type: Shunt Temperature Sensor Package Style: D = SOIC G = SOT-223 LP = TO-92 VS = SOT-23/3L ASTEC Semiconductor 1 AS300 Shunt Temperature Sensor Functional Block Diagram VTEMP + – + – 10 mV/°C GND Pin Function Description Pin Number TO, SOT SOIC Function Description 1 1 GND (S) Optional sense pin ground, otherwise tie to substrate pin GND (F). 2 2 GND (F) Signal ground and circuit substrate. 3 6 VTEMP (F) Output voltage proportional to temperature. VTEMP is nominally 3.00 V at 27¡C (300 K) and increases at 10 mV/¡C. Ð 5 VTEMP (S) 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 Symbol Rating Unit Supply Current IREF 20 mA Continuous Power Dissipation at 25¡C PD TO-92 775 mW SOT-223 1250 mW 8L SOIC 750 mW SOT-23/3L 200 mW TJ 150 ¡C Ð40 to 125 ¡C TSTG Ð65 to 150 ¡C TL 300 ¡C Junction Temperature Operating Temperature Storage Temperature Lead Temp, Soldering 10 Seconds 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 AS300 Typical Thermal Resistances Package θJA θJC Typical Derating TO-92 160¡C/W 80¡C/W 6.3 mW/¡C SOT-223 115¡C/W 8¡C/W 8.7 mW/¡C 8L SOIC 175¡C/W 45¡C/W 5.7 mW/¡C SOT-23/3L 575¡C/W 150¡C/W 1.7 mW/¡C Electrical Characteristics Electrical Characteristics are guaranteed over the full junction temperature range (Ð40 to 125¡C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Parameter Symbol Test Condition Min. Typ. Max. Unit Output Voltage VTEMP IK = 2 mA, TJ = 27¡C (300 K) 2.970 3.000 3.030 V VTEMP IK = 2 mA, TJ = 100¡C (373 K) 3.690 3.730 3.770 V Temperature Coefficient Error IK = 2 mA, deviation from 10 mV/¡C Minimum Operating Current IK(min) Output Impedance ZKA IK = 0.6 to 5.5 mA 0.3 Test Circuit VIN VTEMP IK Figure 1 ASTEC Semiconductor 3 40 µV/¡C 0.6 mA 2 ½ AS300 Shunt Temperature Sensor Typical Performance Curves Forward Characteristics Output Voltage 5.0 0.7 TJ = 27°C IK = 2 mA 0.6 VF – Forward Voltage (V) VTEMP – Output Voltage (V) 4.5 4.0 3.5 3.0 2.5 0.4 0.3 0.2 0.1 2.0 1.5 –50 0.5 0 –25 250 0 25 50 75 300 350 T – Temperature 100 125 400 –0.1 0.01 (°C) (K) 0.1 1.0 10 100 IF – Forward Current (µA) Figure 2 Figure 3 Thermal Response by Package in Still Air Thermal Response by Package in a Stirred Oil Bath 120 120 SOT-223 SOT-223 100 Percent of Thermal Equilibrium (%) Percent of Thermal Equilibrium (%) 100 80 TO-92 60 40 8L SOIC 20 80 TO-92 8L SOIC 60 40 20 0 0 4 8 12 Time (s) 16 20 0 24 0 Figure 4 ASTEC Semiconductor 2 4 6 Time (s) Figure 5 4 8 10 12 Shunt Temperature Sensor AS300 Typical Performance Curves Operating Characteristics Operating Characteristics 1.50 10k 27°C 27°C 1k IK – Reverse Current (µA) IK – Reverse Current (mA) 1.25 1.00 0°C 0.75 0.50 0°C 100 100°C 10 1.0 0.25 100°C 0 0 0 1 2 3 VTEMP – Output Voltage (V) 4 0 1 2 3 VTEMP – Output Voltage (V) Figure 6 Figure 7 Transient Response Dynamic Impedance 4 1k TJ = 27°C TJ = 27°C IK = 2 mA 3 OUTPUT Input and Output Voltage (V) 100 ZK – Output Impedance (Ω) 4 10 1.0 2 1k VIN 1 VOUT 0 5 INPUT 0.1 0.01 0.01 0 0.1 1.0 10 10 1k 0 Figure 8 ASTEC Semiconductor 25 50 t – Time (µs) f – Frequency (kHz) Figure 9 5 500 600 AS300 Shunt Temperature Sensor Typical Applications Linear Fan Controller Fahrenheit Thermometer 15 V 9.1k 9V 15k M 20k 5k 12 VDC, 120 mA Brushless Fan 2N2907 100 µA Full Scale Analog Meter 130k + A LM358 Ð AS300 AS431 R2 R1 AS300 AS1004-1.2 500 Adjust R1 to set 0°F reading (120k) Adjust R2 to set 100°F reading (2.7k) Figure 10 Figure 11 Linear Fan Controller Thermostat 1.2 V VCC M 10k 120k 91k 12 VDC, 120 mA Brushless Fan R1 R2 10k + + IRF233 LM358 Ð AS300 34k LM339 Ð Figure 12 ASTEC Semiconductor R3 AS300 1 nF Figure 13 6