TK11051 TEMPERATURE CONTROLLER IC FEATURES APPLICATIONS ■ Internal Temperature Sensor, Voltage Reference and Comparator ■ Temperature Threshold and Hysteresis Set by Only Two External Resistors ■ Output Logic: High to Low with Increasing Temp. ■ Active High On/Off Control ■ 2.7 to 6.0 V Supply Range ■ Miniature Package (SOT-23L-6) ■ Minimum External Parts Count ■ Low Power Consumption ■ Very Wide Temperature Range ■ ■ ■ ■ ■ ■ ■ Home and Industrial Thermostats Home Appliance Temperature Control Notebook Computer Temperature Monitor Pentium Processor Temperature Monitor Power Supply Overtemperature Protection Copy Machine Overtemperature Protection System Overtemperature Protection TK11051 DESCRIPTION The TK11051 is an accurate temperature controller IC for use over the -30 to +105 °C temperature range. The TK11051 monolithic bipolar integrated circuit contains a temperature sensor, stable voltage reference and a comparator, making the device very useful as an on/off temperature controller. Two external resistors easily set the sensing temperature threshold and hysteresis. Its wide operating voltage range of 2.7 to 6.0 V makes this IC suitable for a number of applications requiring accurate temperature control. The device is in the “on” state when the control pin is pulled to a logic high level. VCC COMP OUT 01 S VCONT VREF GND COMP IN The TK11051 is available in a miniature SOT-23L-6 surface mount package. BLOCK DIAGRAM ORDERING INFORMATION VCONT TK11051MTL ON/OFF CIRCUIT VCC VPTAT TEMPERATURE SENSOR Tape/Reel Code VREF VOLTAGE REFERENCE COMP OUT + TAPE/REEL CODE TL: Tape Left January 1999 TOKO, Inc. COMP IN - GND Page 1 TK11051 ABSOLUTE MAXIMUM RATINGS Supply Voltage ......................................................... 12 V Power Dissipation (Note 1) ................................ 200 mW Storage Temperature Range ................... -55 to +150 °C Operating Temperature Range .................-30 to +105 °C Operating Voltage Range ................................. 2.7 to 6 V Junction Temperature .......................................... 150 °C Lead Soldering Temperature (10 s) ..................... 235 °C TK11050 ELECTRICAL CHARACTERISTICS Test conditions: TA = 25 °C, VCC = 3.0 V, VCONT = 2.4 V, IOUT = 40 µA, R3 = 100 kΩ, unless otherwise specified. SYMBOL PARAMETER ICC Quiescent Current ISTBY Standby Current VPTAT Temperature Sensor Voltage (Note 4) TEST CONDITIONS MIN TYP MAX UNITS Comparator Output LOW 250 350 µA Comparator Output HIGH 210 350 µA 1 µA VCONT ≤ 0.6 V T A = 25 ° C 1.192 V T A = 85 ° C 1.432 V TA = -30 ° C 0.972 V 4.0 mV/° C TC Temperature Coefficient TA = 0 to 85 ° C TERR Temperature Error TA = 0 to 85 ° C, (Note 2) -4.0 CLH Comparator Output HIGH (Note 3) 2.8 CLL Comparator Output LOW R3 ≥ 10 kΩ, (Note 3) IIB Input Bias Current Comparator IN > VPTAT ISH Hysteresis Set Current Comparator IN < VPTAT IOUT Output Sink Current 0 4. 0 °C V 0.3 V 0.1 0.3 µA 1.25 1.6 µA CLL ≤ 0.3 V 30 300 µA 0.9 Vref TERMINAL CHARACTERISTICS Vref Reference Voltage TA = 25 ° C 1.6 Iref Reference Output Current R1 + R2 = 40 kΩ 40 500 µA Line Reg Line Regulation VCC = 3 to 6 V 2 8 mV Load Reg Load Regulation IOUT = 0 to 500 µA 1 8 mV 3.5 6 µA V CONTROL TERMINAL SPECIFICATIONS ICONT Control Current VCONT(ON) Control Voltage (ON) Output ON 1.8 VCC V VCONT(OFF) Control Voltage (OFF) Output OFF GND 0.6 V 1 Note 1: Power dissipation is 200 mW when in Free Air. Derate at 1.6 mW/°C for operation above 25 °C. Note 2: The resistance values of R1 and R2 can be calculated as follows: R1 = Vref x TSH / (TSET x ISH - (TSET -TSH) x IIB), R2 = TSET x TC x R1 / (Vref R1 x IIB - TSET x TC). IIB is 0.1 µA and ISH is 1.25 µA. Note 3: When VPTAT < COMP IN, COMP OUT > 2.8 V (High Level). When VPTAT > COMP IN, COMP OUT < 0.3 V (Low Level). Note 4: VPTAT does not have an output pin. Page 2 January 1999 TOKO, Inc. TK11051 TEST CIRCUIT ICONT ICC VCONT VCC VPTAT ON/OFF CIRCUIT TEMPERATURE SENSOR Vref R3 100 k COMP OUT 10 µF VOLTAGE REFERENCE R1 ISINK - COMP IN GND + IIB R2 ISH R1 + R2 = 40 kΩ TYPICAL PERFORMANCE CHARACTERISTICS TA = 25 °C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 µA, unless otherwise specified. REFERENCE VOLTAGE vs. TEMPERATURE 1.62 1.61 1.4 1.61 1.60 Vref (V) 1.6 1.2 1.60 1.59 1.0 1.59 1.58 0.8 1.58 -40 0 40 80 -40 120 0 40 80 120 2 6 8 10 TA (°C) VCC (V) LOAD REGULATION CONTROL CURRENT vs. TEMPERATURE CONTROL CURRENT vs. CONTROL VOLTAGE 4 4 1.61 3 3 1.60 ICONT µA) 1.62 2 2 1.59 1 1 1.58 0 0 0 4 TA (°C) ICONT µA) Vref (V) LINE REGULATION 1.62 VPTAT (V) Vref (V) REFERENCE VOLTAGE vs. TEMPERATURE 0.2 0.4 Iref (mA) January 1999 TOKO, Inc. 0.6 0.8 -40 0 40 TA (°C) 80 120 0 0.6 1.2 1.8 2.4 VCONT (V) Page 3 TK11051 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 °C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 µA, unless otherwise specified. CONTROL VOLTAGE RESPONSE A CONTROL VOLTAGE RESPONSE B VCONT = 0 TO 2.4 V 2.0 COUT = 0.1 µ F 60 1.0 RR (dB) 1.0 COUT = 0 µF 40 0.5 0.5 20 0 0 0 0 2 4 6 8 VRR = 100 mVrms 80 1.5 Vref (V) Vref (V) VCONT = 0 TO 2.4 V 2.0 1.5 RIPPLE REJECTION RATIO A (Vref) 0 2 4 6 8 COUT = 0.1 µ F 10 100 100 k f (Hz) RIPPLE REJECTION RATIO B (Vref) INPUT BIAS CURRENT vs. TEMPERATURE HYSTERESIS SET CURRENT vs. TEMPERATURE VRR = 100 mVrms 1.4 120 COMP IN > VPTAT COMP IN < VPTAT 1.3 IB (nA) 40 COUT = 0 µF ISH (µA) 100 60 80 1.2 20 60 1.1 0 40 1.0 10 100 1k 10 k 100 k -40 0 40 80 -40 120 80 120 TA (°C) SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE REFERENCE VOLTAGE vs. CONTROL VOLTAGE 350 COMP OUT = LOW LEVEL 220 COMP OUT = HIGH LEVEL 200 300 ICC (µA) 240 1.6 COMP OUT = LOW LEVEL R1 + R2 = 40 kΩ R3 = 100 kΩ 180 0 40 TA (°C) 80 COMP OUT = HIGH LEVEL R1 + R2 = 40 kΩ R3 = 100 kΩ 150 120 1.2 250 200 Page 4 40 TA (°C) 260 -40 0 f (Hz) Vref (V) RR (dB) 10 k TIME (ms) 80 ICC (µA) 1k TIME (ms) 2 3 4 VCC (V) 5 6 0.8 0.4 0 0 0.6 1.2 1.8 2.4 VCONT (V) January 1999 TOKO, Inc. TK11051 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) TA = 25 °C, VCC = 3 V, VCONT = 2.4 V, IOUT = 40 µA, unless otherwise specified. COMPARATOR OUTPUT (LOW LEVEL) vs. OUTPUT SINK CURRENT 160 240 120 160 40 0 0 0 0.6 1.2 1.8 0 2.4 0.2 2 1 0 0.6 0.8 65 70 6 80 85 TEMPERATURE RESPONSE A TA = 25 TO 85 C TSET = 75 C 4 COMP IN = 1.6 TO 0.8 V 3 2 1 8 75 TA (°C) 0 3 2 1 0 0 0.2 0.4 0.6 0.8 0 5 10 15 20 TIME (ms) TIME (ms) TIME (s) TEMPERATURE RESPONSE B TEMPERATURE RESPONSE C TEMPERATURE RESPONSE D TA = 25 TO 85 C TSET = 80 C 4 COMP OUT (V) 3 2 1 0 4 TA = 25 TO -30 C TSET = -20 C 3 COMP OUT (V) 4 COMP OUT (V) 0.4 COMP OUT (V) COMP OUT (V) COMP OUT (V) 4 3 4 1 COMPARATOR INPUT RESPONSE VCONT = 0 TO 2.4 V 2 2 IOUT (mA) CONTROL VOLTAGE RESPONSE 0 3 0 VCONT (V) 4 TSET = 80 °C TSH = 5 °C 4 80 80 COMPARATOR OUTPUT vs. TEMPERATURE COMP OUT (V) 320 CLL (mV) ICC (µA) SUPPLY CURRENT vs. CONTROL VOLTAGE 2 1 0 0 5 10 TIME (s) January 1999 TOKO, Inc. 15 20 TA = 25 TO -30 C TSET = -25 C 3 2 1 0 0 5 10 TIME (s) 15 20 0 5 10 15 20 TIME (s) Page 5 TK11051 APPLICATION HINTS EXTERNAL RESISTORS R1 AND R2 The hysteresis voltage (VSH) of the comparator can be calculated as follows: DRRDRDROP The temperature set point (TSET) and hysteresis (TSH) of the TK11051 are easily set by two external resistors R1 and R2. See Figure 1 for clarification of TSET and TSH. VSH = R 1 x R2 ( R + R ) X (I 1 SH - IIB) 2 (5) TSH TSET where ISH = 1.25 µA The hysteresis represented as temperature is: FIGURE 1 The set voltage (VSET) of the comparator at the set temperature (TSET) is calculated as follows: VSET = TSET x TC TSH = R1 x R2 ( R + R )x 1 (ISH - IIB) TC 2 (6) Solving for temperature coefficient (TC): (1) where TSET is an absolute temperature (°K). That is, TSET (°K) = °C + 273 and TC = 4 mV/°C. 1. For Set Temperatures ≥ 25 °C R x Vref VSET = 2 R1 + R2 TC = R1 x R2 (R + R )x 1 (ISH - IIB) 2 TSH (7) Solving for R1 from Equations 3 and 7: R1 = R2 R1 x R2 x IIB = x (Vref - R1 x IIB) R1 + R2 R1 + R2 Vref x TSH TSET x ISH - ( TSET - TSH) x IIB (2) (8) where Vref = 1.6 V IIB = 0.1 µA R2 can now be calculated by substituting R1 into Equation 4: Example: The temperature coefficient (TC) is calculated by Equations 1 and 2, resulting in: TC = R2 Vref - R1 x IIB x R1 + R2 TSET R1 and R2 when set temperature is 80 °C (TSET = 353 °K) and temperature hysteresis (TSH) is 5 °C. R1 = (3) From Equation 3, R2 is calculated as follows: R2 = (4) Page 6 TSET x TC x R1 1.6 x 5 353 x1.25 µ - ( 353 - 5) x 0.1 µ R1 = 19.68 k = 20 kΩ R2 = 353 x 4 m x 19.68 k 1.6 -19.68 k x 0.1 µ - 353 x 4 m Vref - R1 x IIB - TSET x TC R2 = 149.39 k = 150 kΩ January 1999 TOKO, Inc. TK11051 APPLICATION HINTS (CONT.) 2. For Set Temperatures < 25 °C R1 = Vref x TSH (TSET + TSH) x ISH - TSET x IIB (9) R2 = TSET x TC x R1 Vref - R1 x ISH - TSET x TC (10) Example: R1 and R2 when set temperature is -25 °C (TSET = 248 °K) and temperature hysteresis (TSH) is 5 °C. R1 = 1.6 x 5 (248 + 5) x 1.25 µ - 248 x 0.1 µ R1 = 27.45 k = 27 kΩ R2 = 248 x 4 m x 27.45 k 1.6 - 27.45 k x 1.25 µ - 248 x 4 m R 2 = 47.47 k = 47 kΩ PACKAGE POWER DISSIPATION (PD) The power dissipation rating of 200 mW represents the amount of power the device can dissipate without damage to the IC. Power dissipation should be kept to a minimum to reduce temperature errors due to self-heating. January 1999 TOKO, Inc. Page 7 TK11051 PACKAGE OUTLINE Marking Information SOT-23L (SOT-23L-6) TK11051 Marking 51C 0.6 6 5 4 e1 3.0 1.0 Marking 1 2 3 0.32 e +0.15 - 0.05 0.1 e 0.95 M e 0.95 e 0.95 3.5 0.95 Recommended Mount Pad +0.3 - 0.1 2.2 max 15 1.2 0.15 0.1 +0.15 - 0.05 0 - 0.1 1.4 max 0.3 (3.4) 0.4 + 0.3 3.3 Dimensions are shown in millimeters Tolerance: x.x = ± 0.2 mm (unless otherwise specified) Toko America, Inc. Headquarters 1250 Feehanville Drive, Mount Prospect, Illinois 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 TOKO AMERICA REGIONAL OFFICES Midwest Regional Office Toko America, Inc. 1250 Feehanville Drive Mount Prospect, IL 60056 Tel: (847) 297-0070 Fax: (847) 699-7864 Western Regional Office Toko America, Inc. 2480 North First Street , Suite 260 San Jose, CA 95131 Tel: (408) 432-8281 Fax: (408) 943-9790 Eastern Regional Office Toko America, Inc. 107 Mill Plain Road Danbury, CT 06811 Tel: (203) 748-6871 Fax: (203) 797-1223 Semiconductor Technical Support Toko Design Center 4755 Forge Road Colorado Springs, CO 80907 Tel: (719) 528-2200 Fax: (719) 528-2375 Visit our Internet site at http://www.tokoam.com The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. No license is granted by implication or otherwise under any patent or patent rights of TOKO, Inc. Page 8 © 1999 Toko, Inc. All Rights Reserved January 1999 TOKO, Inc. IC-xxx-TK11051 0798O0.0K Printed in the USA