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19-2457; Rev 2; 11/03
Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References
General Description
The MAX6610/MAX6611 are precise, low-power analog temperature sensors combined with a precision voltage reference. They are ideal for applications involving analog-to-digital converters (ADCs), where the MAX6610/ MAX6611 provide the reference voltage for the ADC and develop a temperature output voltage that is scaled to provide convenient ADC output codes. An 8bit ADC's LSB is equal to 1C, while a 10-bit ADC's LSB corresponds to 0.25C. The MAX6610/MAX6611 are available in two versions. The MAX6611 operates from a 4.5V to 5.5V power supply and has a 4.096V reference output. The MAX6610 operates from 3.0V to 5.5V and has a 2.560V reference output. Power-supply current is less than 150A (typ). Both the MAX6610/MAX6611 are available in a 6-pin SOT23 package and operate from -40C to +125C. o 1C Accuracy o Low TC Reference (10ppm, typ) o Temperature Output Scaled for ADCs o Integrated Reference Voltage Scaled for Convenient ADC Bit Weights o No Calibration Required o Low Supply Current o Tiny 6-Pin SOT23 Package o Low-Current Shutdown Mode
Features
MAX6610/MAX6611
Applications
System Temperature Monitoring Temperature Compensation HVAC Home Appliances
PART
Ordering Information
TEMP RANGE PINVREF PACKAGE (V) 2.560 4.096 TOP MARK ABDO ABOP
MAX6610AUT-T -40C to +125C 6 SOT23-6 MAX6611AUT-T -40C to +125C 6 SOT23-6
Pin Configuration
VCC
Typical Application Circuit
TOP VIEW
VCC
VCC 1
6
GND
SHDN
GND 2
MAX6610 MAX6611
MAX6610 MAX6611
REF TEMP REF IN ADC IN 1nF GND 1nF
C
5
REF
0.1F
VCC
SHDN 3
4
TEMP
GND
SOT23
GND
________________________________________________________________ Maxim Integrated Products
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Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References MAX6610/MAX6611
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND VCC ........................................................................-0.3V to +6.0V All Other Pins............................................. -0.3V to (VCC + 0.3V) Input Current ...................................................................... 20mA Output Current ....................................................................20mA Continuous Power Dissipation (TA = +70C) 6-Pin SOT23 (derate 8.7mW/C above +70C) ........695.7mW Operating Temperature Range (TMIN, TMAX) ....-40C to +125C ESD Protection (all pins, Human Body Model) ..................2000V Storage Temperature Range ............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) ................................+300C
Stresses beyond 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 other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 3.0 to 5.5V (MAX6610), VCC = 4.5V to 5.5V (MAX6611), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5.0V (MAX6611) and VCC = 3.3V (MAX6610), TA = +25C.) (Note 1)
PARAMETER Supply Current SYMBOL ICC SHDN = 0 TA = +25C Temperature Sensor Error TA = -10C to +55C (Note 2) TA = -20C to +85C (Note 2) TA = -40C to +125C (Note 2) Temperature Sensor Output Voltage Temperature Sensor Nonlinearity Temperature Sensor Output Slope Temperature Sensor Supply Sensitivity Temperature Sensor Load Regulation Temperature Sensor Capacitive Load Temperature Sensor Long-Term Stability Reference Output Voltage Voltage Reference Temperature Coefficient Voltage Reference Line Regulation Voltage Reference Load Regulation Voltage Reference Long-Term Stability VOUT/ IOUT VOUT/ time Sourcing: 0 IOUT 1mA Sinking: -200A IOUT 0 1000h at TA = +25C VREF VTEMP MAX6611, TA = 0C MAX6610, TA = 0C TA = -10C to +80C MAX6611 MAX6610 3.0V VCC 5.5V for MAX6610 and 4.5V VCC 5.5V for MAX6611 Sourcing: 0 IOUT 500A Sinking: -100A IOUT 0 No sustained oscillations (Note 3) TA = +50C for 1000hr MAX6611, TA = +25C MAX6610, TA = +25C TA = -40C to +85C 4.076 2.547 -50 -1 1 4 50 -1 -2.5 0 0.1 4.096 2.560 10 4.116 2.573 +50 +1 2 20 -2.5 -1.2 -2.4 -3.7 -5.0 1.200 0.750 1 16 10 0.5 +1 +5 0.2 CONDITIONS Outputs unloaded MIN TYP 150 0.2 MAX 250 1 +1.2 +2.4 +3.7 +5.0 V C mV/C C/V C/mA F C V ppm/C mV/V ppm C UNITS A
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Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 3.0 to 5.5V (MAX6610), VCC = 4.5V to 5.5V (MAX6611), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5.0V (MAX6611) and VCC = 3.3V (MAX6610), TA = +25C.) (Note 1)
PARAMETER Voltage Reference Output Noise Turn-On Settling Time (VCC to REF) Turn-On Settling Time (VCC to TEMP) Turn-On Settling Time (SHDN to REF) Turn-On Settling Time (SHDN to TEMP) LOGIC INPUT (SHDN) Logic Input High Voltage Logic Input Low Voltage Logic Input Leakage VIH VIL ILEAK SHDN = 5V, VCC = 5V SHDN = 0V, VCC = 5V 10 0.1 VCC 0.5 0.5 25 1 V V A SYMBOL CONDITIONS f = 0.1Hz to 10Hz f = 10Hz to 10kHz VCC = 0 to 5V step, CLOAD = 50pF, VREF = 0.1% of final value VCC = 0 to 5V step, CLOAD = 50pF, VTEMP = 1C of final value SHDN = 0 to 5V step, CLOAD = 50pF, VREF = 0.1% of final value SHDN = 0 to 5V step, CLOAD = 50pF, VTEMP = 1C of final value MIN TYP 100 100 300 500 300 500 MAX UNITS VP-P VP-P s s s s
MAX6610/MAX6611
Note 1: All parameters tested at room temperature. Values through temperature are guaranteed by design. Note 2: Guaranteed to 4 sigma. Note 3: Guaranteed by design.
Typical Operating Characteristics
(VCC = 5V, IOUT = 0V, TA = +25C, unless otherwise specified.)
MAX6610 TEMPERATURE VOLTAGE vs. TEMPERATURE
MAX6610 toc01
REFERENCE VOLTAGE ERROR vs. TEMPERATURE
MAX6610 toc02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
180 160 SUPPLY CURRENT (mA) 140 120 100 80 60 40 TA = +25C TA = -40C TA = +100C
MAX6610 toc03
2.0 1.8 TEMPERATURE VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0
0.10 REFERENCE VOLTAGE ERROR (%) 0.09 0.08 0.07 0.06 0.05 0.04 0.03
200
20 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References MAX6610/MAX6611
Pin Description
PIN 1 2 3 NAME VCC GND SHDN FUNCTION Supply Voltage Input. Bypass to GND with a 0.1F capacitor. Ground Logic Level Shutdown Input (Active Low). Driving SHDN with a logic low turns off internal circuitry to reduce supply current to 1A (max). Temperature Output Pin. Voltage at TEMP varies linearly with temperature. Reference Voltage Output Must be connected to pin 2.
Temperature Sensor
The MAX6610/MAX6611 TEMP output provides an analog output voltage that is a linear function of its die temperature as defined by: VTEMP = 1.2V + (TC 16mV/C) for the MAX6611 and VTEMP = 0.75V + (TC 10mV/C) for the MAX6610 The slope of the output voltage is V REF /256 per C (16mV/C for the MAX6611 and 10mV/C for the MAX6610). There is a +75C offset on the temperature output (The MAX6611's output is 1.2V and, the MAX6610's output is 0.75V) at 0C. The temperature error is less than 1.2C at TA = +25C, less than 3.8C from TA = -20C to +85C, and only 5C for TA = -40C to +125C.
4 5 6
TEMP REF GND
Detailed Description
The MAX6610/MAX6611 combine a temperature sensor with a low-power voltage reference. The reference voltage and temperature sensor gain give convenient LSB weights when used with an ADC. For example, when an 8-bit ADC is used with the MAX6610/MAX6611, an LSB is equivalent to 1C and a 10-bit ADC LSB is equivalent to 0.25C. The reference output features a proprietary temperature-coefficient, curvature-correction circuit and lasertrimmed thin-film resistors that result in a low temperature coefficient (50ppm/C max) and initial accuracy of 0.5% max. The maximum supply current is 250A during normal operation and 1A max during shutdown. The supply voltage range is 3.0V to 5.5V for the MAX6610 and 4.5V to 5.5V for the MAX6611.
Shutdown
The MAX6610/MAX6611 are equipped with a shutdown feature that, when driven low, shuts down all internal circuitry and reduces supply current to 1A (max). When in shutdown, REF is pulled to GND through a 150k resistor and TEMP goes to a high-impedance state. For normal operation, connect SHDN to VCC.
Applications Information
Output/Load Capacitance
The MAX6610/MAX6611 TEMP output can drive capacitive loads up to 0.2F. The MAX6610/MAX6611 REF output can drive capacitive loads up to 1F. Devices in this family do not require an output capacitance for dynamic stability. However, in applications where the load or the supply can experience step changes, an output capacitor within the specified range reduces the amount of overshoot (or undershoot) and assists the circuit's transient response. Many applications do not need an external capacitor, and this family can offer a significant advantage in these applications when board space is critical.
Voltage Reference
The MAX6610/MAX6611 REF output provides a voltage reference for ADCs or other system subcircuits. REF is capable of driving loads of up to 1mA. An output capacitor can be as large as 1F. The voltage reference provides scaled ADC conversions with bit weights that are in convenient units. For the MAX6610 (2.56V REF output), an 8-bit ADC yields 10mV/bit or 2.5mV/bit for a 10-bit ADC. The MAX6611 (4.096V REF output) yields 16mV/bit for an 8bit ADC or 4mV/bit for a 10-bit ADC.
Supply Current
The quiescent supply current of the MAX6610/ MAX6611 is typically 150A and is virtually independent of the supply voltage. Unlike shunt-mode references, the load current of series-mode references is drawn from the supply voltage only when required, so supply current is not wasted and efficiency is maximized over the entire supply voltage range. This improved efficiency can help reduce power dissipation and extend battery life.
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Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References
Sensing Circuit Board and Ambient Temperatures
Temperature sensor ICs, like the MAX6610/MAX6611 that sense their own die temperatures, must be mounted on, or close to, the object whose temperature they are intended to measure. Because there is a good thermal path between the package's metal leads and the IC die, the MAX6610/MAX6611 can accurately measure the temperature of the circuit board to which it is soldered. If the sensor is intended to measure the temperature of a heat-generating component on the circuit board, it should be mounted as close as possible to that component and should share supply and ground traces (if they are not noisy) with that component where possible. This maximizes the heat transfer from the component to the sensor. The thermal path between the plastic package and the die is not as good as the path through the leads, so the MAX6610/MAX6611, like all temperature sensors in plastic packages, are less sensitive to the temperature of the surrounding air than to the temperature of the leads. They can be successfully used to sense ambient temperature if the circuit board is designed to track the ambient temperature. As with any IC, the wiring and circuits must be kept insulated and dry to avoid leakage and corrosion, especially if the part is operated at cold temperatures where condensation can occur.
Self-Heating
The MAX6610/MAX6611 are low-power circuits and are intended to drive light loads. As a result, the temperature rise due to power dissipation on the die is insignificant under normal conditions. For example, assume that the MAX6611 is operating from a 5V supply at +50C (VTEMP = 2V) and that the temperature output is driving a 100k load (ITEMP = 20A). Also assume that the voltage reference is driving a 500A load and the worst-case quiescent supply current is used. In the 6-pin SOT23 package, the die temperature increases above the ambient by 0.2C. Next, assume TEMP and REF are driving their maximum loads (ITEMP = 500A and IREF = 1mA) and VCC = 5V, and TA = +50C (VTEMP = 2V). Here, the die temperature increases above the ambient by 0.4C. A first order for self-heating effects can be estimated from temperature and reference load currents and the previous supply voltage.
MAX6610/MAX6611
Chip Information
TRANSISTOR COUNT: 1346 PROCESS: BiCMOS
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Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References MAX6610/MAX6611
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
6LSOT.EPS
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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