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19-1617; Rev 2; 11/03
Resistor-Programmable SOT Temperature Switches
________________General Description
The MAX6509/MAX6510 are fully integrated, resistorprogrammable temperature switches with thresholds set by an external resistor. They require only one external resistor to set the temperature threshold within a wide -40C to +125C temperature range. The MAX6509 provides an open-drain output. The MAX6510 features three selectable output options: active-low, active-high, and open drain with an internal pull-up resistor. These switches operate with a +2.7V to +5.5V single supply while providing a temperature threshold accuracy of 0.5C (typ) or 4.7C (max). They typically consume 32A supply current. Hysteresis is pin selectable to 2C or 10C. The MAX6509/MAX6510 are available in 5-pin and 6-pin SOT23 packages, respectively.
____________________________Features
o 0.5C Threshold Accuracy o 4.7C (max) Threshold Accuracy (-40C to +125C) o Temperature Threshold Set by a 1% External Resistor o Set-Hot or Set-Cold Option o Low 32A Supply Current o Open-Drain, Push-Pull Outputs; Open-Drain with Internal Pull-Up Resistor o Pin-Selectable 2C or 10C Hysteresis o SOT23 Packages
MAX6509/MAX6510
________________________Applications
P Temperature Monitoring in High-Speed Computers Temperature Control Temperature Alarms Fan Control Automotive
PART* MAX6509CAUK-T MAX6509HAUK-T MAX6510CAUT-T** MAX6510HAUT-T**
Ordering Information
TEMP. RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 5 SOT23-5 5 SOT23-5 6 SOT23-6 6 SOT23-6 TOP MARK ADNT ADNU AAHA AAHB
*A minimum order of 2500 pc. is required for SOT packages. **See Table 1 for selectable output options.
Typical Operating Circuit
+2.7V TO +5.5V 0.1F VCC SET MAX6509 OUT MAX6510 (OUT) RSET (OUTSET) GND HYST GND GND OUT 3 4 HYST VCC INT P GND 2 SET 1 5 VCC
Pin Configurations
TOP VIEW
SET 1
6 VCC
MAX6509
GND 2
MAX6510
5 OUTSET
OUT, OUT 3
4 HYST
SOT23-5
( ) ARE FOR MAX6510.
SOT23-6
________________________________________________________________ Maxim Integrated Products
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Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
ABSOLUTE MAXIMUM RATINGS
Reference to GND Supply Voltage (VCC).................-0.3V to +6V OUT (MAX6509) ....................................................-0.3V to +6V OUT, OUT (MAX6510).............................-0.3V to (VCC + 0.3V) SET, HYST, OUTSET ..................................-0.3V to (VCC + 0.3V) Output Current (all pins) .....................................................20mA Input Current (all pins) ........................................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C).............571mW 6-Pin SOT23 (derate 8.7mW/C above +70C).............696mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +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 = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Supply Voltage Range Supply Current Temperature Threshold Accuracy Temperature Threshold Hysteresis HYST Input Leakage HYST Input Threshold OUT Impedance to VCC Output Voltage High Output Voltage Low Open-Drain Output Leakage Current OUTSET Voltage VOH VOL IOUT VIH VIL OUTSET = unconnected (MAX6510) IOUT = 5mA, OUTSET = GND or VCC IOUT = 5mA VOUT = VCC (MAX6509) OUT, active low VOUTSET MAX6510 OUT, active high OUT, open drain VOUTSET = GND OUTSET Current IOUTSET MAX6510 VOUTSET = VCC OUTSET = unconnected Note 1: 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. 0.85 * VCC 0.72 * VCC -5.5 5.5 0.1 A 0.55 * VCC 60 100 VCC - 0.4 0.3 10 0.2 * VCC V SYMBOL VCC MAX6509 ICC OUTSET = GND or VCC (MAX6510) OUTSET = unconnected, OUT = low TTH THYST TA = 0C to +125C TA = -40C to 0C HYST = GND HYST = VCC CONDITIONS MIN 2.7 32 47 97 0.5 0.5 2 10 1 VCC - 0.4 0.4 160 TYP MAX 5.5 50 80 165 4.7 3.7 A A C C A V k V V A UNITS V
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Resistor-Programmable SOT Temperature Switches
__________________________________________Typical Operating Characteristics
(VCC = +5V, RPULL-UP = 10k (MAX6509 only), TA = +25C, unless otherwise noted.)
RSET vs. TEMPERATURE (TA = -40C TO 0C)
MAX6509/10 toc01
MAX6509/MAX6510
SUPPLY CURRENT vs. TEMPERATURE
50 45 SUPPLY CURRENT (A) 40 35 30 VCC = +2.7V 25 20 15 10 RSET = 0 OUTSET = GND (MAX6510) -50 -25 0 25 50 75 100 125 TEMPERATURE (C) VCC = +3.3V RSET (k) VCC = +5V 160 150 140 130 120 110 100 90 -40 -35
-30
-25
-20
-15
-10
-5
0
TEMPERATURE (C)
RSET vs. TEMPERATURE (TA = 0C TO +125C)
MAX6509/10 toc03
TRIP THRESHOLD OFFSET vs. TEMPERATURE
0.15
SET POINT OFFSET (C)
100 90 80 70 RSET (k) 60 50 40 30 20 10 0 0 20 40 60 80 100 120
VCC = +2.7V
0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 VCC = +2.7V -50 -25 0 25 50 75 100 VCC = +3.3V VCC = +3.3V VCC = +5V
140
125
TEMPERATURE (C)
TEMPERATURE (C)
TRIP POINT ERROR vs. SET TEMPERATURE
MAX6509/10 toc05
0.9 0.8 0.7 ERROR (C)
10 HYSTERESIS (C) 8 6 4
HYST = VCC
0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -25 0 25 50 75 100 125 TEMPERATURE (C) RSET 200ppm 100ppm
HYST = GND 2 50ppm 0 -40 -25 0 25 50 75 100 125 TEMPERATURE (C)
_______________________________________________________________________________________
MAX6509/10 toc06
1.0
HYSTERESIS vs. TEMPERATURE
12
VCC = +5V 1% RSET SET RESISTOR TEMPCO
MAX6509/10 toc04
0.20
MAX6509/10 toc02
3
Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
Pin Description
PIN NAME MAX6509 1 2 3 -- 4 5 MAX6510 1 2 -- 3 4 6 SET GND OUT OUT, OUT HYST VCC OUTSET Temperature Set Point. Connect an external 1% resistor from SET to GND to set trip point. Ground Open-Drain Output. Reset to high impedance during power-on. Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output. See Table 1. Reset to deassert during power-on. Hysteresis Selection. Hysteresis is 10C for HYST = VCC, 2C for HYST = GND. Power-Supply Input Trilevel Control Input: OUTSET = VCC sets OUT to active high. OUTSET = GND sets OUT to active low. OUTSET = Unconnected sets OUT to open drain with internal pull-up resistor. FUNCTION
--
5
Detailed Description
The MAX6509/MAX6510 fully integrated temperature switches incorporate two temperature-dependent references and one comparator. One reference exhibits a positive temperature coefficient, and the other has a negative temperature coefficient. The temperature at which the two reference voltages are equal determines the temperature trip point. Pin-selectable 2C or 10C hysteresis keeps the output from oscillating when the temperature is close to the threshold. The MAX6509 has an active-low, open-drain output structure that can only sink current. The MAX6510 has three different output options from which to choose (Table 1). The MAX6509/MAX6510 are programmable for a wide range of temperature thresholds from -40C to +125C. The temperature threshold is set by an external resistor between SET and GND. The MAX6509 output easily interfaces with a microprocessor (P) reset input (Figure 2). The MAX6510 output is intended for applications such as driving a fan control switch (Figure 3).
Hysteresis Input
The HYST pin is a CMOS-compatible input that selects hysteresis at either a high level (10C for HYST = VCC) or a low level (2C for HYST = GND). Hysteresis prevents the output from oscillating when the temperature is near the trip point. Do not leave HYST unconnected. Connect HYST to GND or VCC. Other input voltages cause increased supply current. Choose the set-hot temperature (H) or set-cold temperature (C) option to ensure that the trip point is accurate and the hysteresis is in the right direction. A MAX6509 or MAX6510 with the H suffix will first trip at the correct point when temperature is increasing. For example, a MAX6509HAUK-T or MAX6510HAUT-T with its trip point set to 100C will assert when its temperature rises above +100C, and will not deassert until its temperature drops below +100C minus the selected hysteresis value (e.g., +98C if 2C hysteresis is chosen). Conversely, if the trip temperature of a MAX6509CAUK-T or MAX6510CAUT-T is -40C, the output asserts at -40C as temperature falls, and deasserts when temperature rises above -40C plus the hysteresis value (e.g., -38C if 2C hysteresis is chosen) as shown in Figure 4.
Table 1. OUTSET-Selectable Outputs
OUTSET Connected to VCC Connected to GND Unconnected OUT Active high Active low Open drain with internal pull-up resistor
Output Selection
The MAX6509 provides an open-drain output. The MAX6510 features three output options selectable by OUTSET (Table 1).
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Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE HYST NETWORK
V OUT
MAX6509 WITH A PULL-UP RESISTOR
HYST
TTH HYSTERESIS*
TEMP
MAX6509HAUK-T
V OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE OUTSET = VCC HYST NETWORK OUT
MAX6510
HYST
TTH HYSTERESIS*
TEMP
MAX6510HAUT-T
OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE HYST NETWORK
V OUT
MAX6509 WITH A PULL-UP RESISTOR
HYST
TTH HYSTERESIS*
TEMP
MAX6509CAUK-T
MAX6510
OUT NEGATIVE TEMPCO REFERENCE POSITIVE TEMPCO REFERENCE OUTSET = VCC HYST NETWORK OUT
HYST
TTH HYSTERESIS*
TEMP
MAX6510CAUT-T
*HYSTERESIS IS 10C FOR HYST = VCC AND 2C FOR HYST = GND.
Figure 1. Block and Functional Diagrams _______________________________________________________________________________________ 5
Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
+3.3V +5V VCC VCC P INT OUT HYST RPULL-UP 100k VCC MAX6509 SET GND RSET P HEAT VCC OUTSET HYST SET RSET FAN
MAX6510 GND OUT
SHUTDOWN OR RESET HEAT
Figure 2. Microprocessor Alarm/Reset
Figure 3. Overtemperature Fan Control
Applications Information
100C T THRESHOLD = 65C
Thermal Considerations
The MAX6509/MAX6510 supply current is typically 32A. When used to drive high-impedance loads, the devices dissipate negligible power; therefore, the die temperature is essentially the same as the package temperature. The key to accurate temperature monitoring is good thermal contact between the MAX6509/ MAX6510 package and the device being monitored. In some applications, the SOT23-5 and SOT23-6 packages may be small enough to fit underneath a socketed P, allowing the device to monitor the P's temperature directly. Use the monitor's output to reset the P, assert an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6509/MAX6510 die. The rise in die temperature due to self-heating is given by the following formula: TJ = PDISS * JA where P DISS is the power dissipated by the MAX6509/MAX6510, and JA is the package's thermal resistance. The typical thermal resistance is 115C/W for the SOT23-6 package. To limit the effects of selfheating, minimize the output currents. For example, if the MAX6510 sinks 5mA, the output voltage is guaranteed to be less than 0.3V; therefore, an additional 1.5mW of power is dissipated within the IC. This corresponds to a 0.173C shift in the die temperature in the SOT23-6.
98C TEMPERATURE -38C -40C THYST = 2C T THRESHOLD = -10C SET HOT 100C 98C
OUT MAX6509H
OUT MAX6510C OUTSET = GND -40C SET COLD -38C
Figure 4. Temperature Response
Temperature-Window Detector
The MAX6509/MAX6510 temperature switch outputs assert when the die temperature is outside the programmed range. Combining the outputs of a set-cold
and a set-hot device creates an over/undertemperature detector. The MAX6509/MAX6510 are designed to form two complementary pairs, each containing one cold trip point output and one hot trip point output. The assertion of either output alerts the system to an out-of-range temperature. The MAX6510 push-pull output stages can be ORed to produce a thermal out-of-range alarm. More favorably, a MAX6509HAUK-T and MAX6509CAUK-T can be directly wire-ORed with a single external resistor to accomplish the same task (Figure 5). The temperature window (alarms or detectors as in Figure 5) can be used to accurately determine when a device's temperature falls out of a programmed range, for example -3C to +75C as shown in Figure 5. The thermal overrange signal can be used to assert a ther-
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Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
+5V VCC MAX6510HAUT GND HYST OUT OUT OF RANGE VCC VCC OUT UNDERTEMP MAX6509CAUT OUTSET HYST SET GND VCC HEAT VCC HYST RSET 100k RSET 55k RPULL-UP 100k OUT OF RANGE FAN CONTROL OUT OUTSET VCC P RSET 30k OVERTEMP OUTSET HEAT VCC OUTSET VCC TEMPERATURE FAULT +5V
MAX6510HAUT GND HYST OUT SET
RSET 30k
MAX6510HAUT SET GND
+5V
VCC RSET 30k OUT MAX6509HAUK GND HYST OUT
VCC
Figure 6. Low-Power, High-Reliability, Fail-Safe Temperature Monitor
Set-Point Resistor
MAX6509CAUK GND HYST SET RSET 100k
Figure 5. Temperature-Window Detector
To set the trip-point temperature, connect a resistor between SET and GND. The resistor's value is determined either from the RSET vs. Temperature graphs (see Typical Operating Characteristics) or from the equations below. To set the temperature trip point from -40C to 0C, use the following equation: RSET(k) = [(1.3258 * 105) / (T+1.3)] - 310.1693 [(5.7797 * 106) / (T+1.3)2] To set the temperature trip point from 0C to +125C, use the following equation: RSET(k) = [(8.3793 * 104) / T] - 211.3569 + [(1.2989 * 105) / T2] where T is the trip temperature in Kelvin.
mal shutdown, power-up, recalibration, or other temperature-dependent function.
Low-Cost, Fail-Safe Temperature Monitor
In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level integration and low cost of the MAX6509/MAX6510 facilitate the use of multiple temperature monitors to increase system reliability. Figure 6 shows two MAX6510s with different temperature thresholds. This ensures that fault conditions that can overheat the monitored device cause no permanent damage. The first temperature monitor activates the fan when the die temperature exceeds +45C. The second MAX6510 triggers a system shutdown if the die temperature reaches +75C. The second temperature monitor's output asserts when a wide variety of destructive fault conditions occur, including latchups, short circuits, and cooling-system failures.
Chip Information
TRANSISTOR COUNT: 234
_______________________________________________________________________________________
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Resistor-Programmable SOT Temperature Switches MAX6509/MAX6510
________________________________________________________Package Information
SOT-23 5L .EPS
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1
1
6LSOT.EPS
PACKAGE OUTLINE, SOT-23, 6L
21-0058
F
1
1
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.
8 _____________________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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