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19-1280; Rev 2; 11/99
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220
________________General Description
The MAX6501-MAX6504 low-cost, fully integrated temperature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. Operating from a +2.7V to +5.5V supply, these devices feature two on-chip, temperature-dependent voltage references and a comparator. They are available with factory-trimmed temperature trip thresholds from -45C to +115C in 10C increments, and are accurate to 0.5C (typ) or 6C (max). These devices require no external components and typically consume 30A supply current. Hysteresis is pin-selectable at +2C or +10C. The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (P) reset input. The MAX6502/MAX6504 have an activehigh, push-pull output intended to directly drive fancontrol logic. The MAX6501/MAX6502 are offered with hot-temperature thresholds (+35C to +115C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45C to +15C), asserting when the temperature is below the threshold. The MAX6501-MAX6504 are offered in eight standard temperature versions; contact the factory for pricing and availability of nonstandard temperature versions. They are available in 5-pin SOT23 and 7-pin TO-220 packages.
____________________________Features
o 0.5C (typical) Threshold Accuracy Over Full Temperature Range o No External Components Required o Low Cost o 30A Supply Current o Factory-Programmed Thresholds from -45C to +115C in 10C Increments o Open-Drain Output (MAX6501/MAX6503) Push-Pull Output (MAX6502/MAX6504) o Pin-Selectable +2C or +10C Hysteresis o SOT23-5 and TO220-7 Packages
MAX6501-MAX6504
Ordering Information
PART* MAX6501UK_ _ _ _-T MAX6501CM_ _ _ _-T MAX6502UK_ _ _ _-T MAX6502CM_ _ _ _-T MAX6503UK_ _ _ _-T MAX6503CM_ _ _ _-T MAX6504UK_ _ _ _-T MAX6504CM_ _ _ _-T TEMP. RANGE -55C to +125C -55C to +125C -55C to +125C -55C to +125C -55C to +125C -55C to +125C -55C to +125C -55C to +125C PIN-PACKAGE 5 SOT23-5 7 TO-220-7 5 SOT23-5 7 TO-220-7 5 SOT23-5 7 TO-220-7 5 SOT23-5 7 TO-220-7
Typical Operating Circuit
+2.7V TO +5.5V
VCC MAX6502 TOVER GND GND HYST
VCC P
*These parts are offered in eight standard temperature versions with a minimum order of 2,500 pieces. To complete the suffix information, add P or N for positive or negative trip temperature, and select an available trip point in degrees centigrade. For example, the MAX6501UKP065-T describes a MAX6501 in a SOT23-5 package with a +65C threshold. Contact the factory for pricing and availability of nonstandard temperature versions (minimum order 10,000 pieces).
INT
GND
________________________Applications
P Temperature Monitoring in High-Speed Computers Temperature Control
Selector Guide and Pin Configurations appear at end of data sheet.
Temperature Alarms Fan Control
Patents
Pending ________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ...............................................-0.3V to +7V TOVER (MAX6501) ...................................................-0.3V to +7V TOVER (MAX6502) .....................................-0.3V to (VCC + 0.3V) TUNDER (MAX6503) ................................................-0.3V to +7V TUNDER (MAX6504) ..................................-0.3V to (VCC + 0.3V) All Other Pins..............................................-0.3V to (VCC + 0.3V) Input Current (all pins) ........................................................20mA Output Current (all pins) .....................................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23-5 (derate 7.1mW/C above +70C) .........571mW Operating Temperature Range .........................-55C to +125C Storage Temperature Range .............................-65C to +165C Lead Temperature (soldering, 10sec) .............................+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, RPULL-UP = 100k (MAX6501/MAX6503 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Supply Voltage Range Supply Current Temperature Threshold Accuracy (Note 2) SYMBOL VCC ICC -45C to -25C TTH -15C to +15C +35C to +65C +75C to +115C Temperature Threshold Hysteresis HYST Input Threshold (Note 3) THYST VIH VIL ISOURCE = 500A, VCC > 2.7V (MAX6502/MAX6504 only) ISOURCE = 800A, VCC > 4.5V (MAX6502/MAX6504 only) ISINK = 1.2mA, VCC > 2.7V ISINK = 3.2mA, VCC > 4.5V VCC = 2.7V, VTUNDER = 5.5V (MAX6503), VTOVER = 5.5V (MAX6501) 10 0.8 x VCC V VCC - 1.5 0.3 0.4 V nA HYST = GND HYST = VCC 0.8 x VCC 0.2 x VCC -6 -4 -4 -6 CONDITIONS MIN 2.7 30 0.5 0.5 0.5 0.5 2 10 TYP MAX 5.5 85 6 4 4 6 C V C UNITS V A
Output Voltage High
VOH
Output Voltage Low Open-Drain Output Leakage Current
VOL
Note 1: 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: The MAX6501-MAX6504 are available with internal, factory-programmed temperature trip thresholds from -45C to +115C in +10C increments (see Selector Guide). Note 3: Guaranteed by design.
2
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Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220
__________________________________________Typical Operating Characteristics
(VCC = +5V, RPULL-UP = 100k (MAX6501/MAX6503), TA = +25C, unless otherwise noted.)
MAX6502/MAX6504 OUTPUT SOURCE RESISTANCE vs. TEMPERATURE
MAX6501 TOC01
MAX6501-MAX6504
TRIP THRESHOLD ACCURACY
MAX6501 TOC-A
SUPPLY CURRENT vs. TEMPERATURE
40 35 SUPPLY CURRENT (A) 30 25 20 15 10 800 OUTPUT SOURCE RESISTANCE () 700 600 500 400 300 200 100 0 -55 -25 5 35 65 95 125 -55
SAMPLE SIZE = 300 PERCENTAGE OF PARTS SAMPLED (%) 50 40 30 20 10 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 ACCURACY (C)
VCC = 2.7V
VCC = 3.3V
VCC = 5.0V
5 0 TEMPERATURE (C)
-25
5
35
65
95
125
TEMPERATURE (C)
OUTPUT SINK RESISTANCE vs. TEMPERATURE
140 OUTPUT SINK RESISTANCE () 120 100 VCC = 3.3V 80 60 40 20 0 -55 -25 5 35 65 95 125 VCC = 5.0V +15C/div VCC = 2.7V
MAX6501 TOC03
SOT23 THERMAL STEP RESPONSE IN PERFLUORINATED FLUID
MAX6501 TOC4
SOT23 THERMAL STEP RESPONSE IN STILL AIR
MAX6501 TOC5
160
+100C
+12.5C/div
MOUNTED ON 0.75in2 OF 2 oz. COPPER +25C 5sec/div
MOUNTED ON 0.75in2 OF 2 oz. COPPER +25C 20sec/div
TEMPERATURE (C)
HYSTERESIS vs. TRIP TEMPERATURE
14 12 HYSTERESIS (C) 10 8 6 4 2 0 -45 -25 -5 15 35 55 75 95 115 TRIP TEMPERATURE (C) MAX6503 MAX6504 HYST = GND MAX6501 MAX6502 HYST = GND MAX6503 MAX6504 HYST = VCC MAX6501 MAX6502 HYST = VCC
MAX6501 TOC8
MAX6501 START-UP AND POWER-DOWN (T < TTH)
16
MAX6501 TOC07
MAX6501 START-UP DELAY (T > TTH)
MAX6501 TOC07A
A A
MAX6501 TOC02
60
+100C
B
B
TRACE A: TOVER VOLTAGE, RPULL-UP = 100k TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT
TRACE A: TOVER VOLTAGE, RPULL-UP = 100k TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT
_______________________________________________________________________________________
3
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
Pin Description
PIN NAME MAX6501 1, 2 MAX6502 1, 2 MAX6503 1, 2 MAX6504 1, 2 GND Ground. Not internally connected. Tie both ground pins together close to the chip. Pin 2 provides the lowest thermal resistance to the die. Hysteresis Input. Connect HYST to GND for +2C hysteresis, or connect to VCC for +10C hysteresis. Supply Input (+2.7V to +5.5V) Open-Drain, Active-Low Output. TOVER goes low when the die temperature exceeds the factory-programmed temperature threshold. Connect to a 100k pull-up resistor. May be pulled up to a voltage higher than VCC. Push-Pull Active-High Output. TOVER goes high when the die temperature exceeds the factory-programmed temperature threshold. Open-Drain, Active-Low Output. TUNDER goes low when the die temperature goes below the factory-programmed temperature threshold. Connect to a 100k pull-up resistor. May be pulled up to a voltage higher than VCC. Push-Pull Active-High Output. TUNDER goes high when the die temperature falls below the factory-programmed temperature threshold. FUNCTION
3 4
3 4
3 4
3 4
HYST VCC
5
--
--
--
TOVER
--
5
--
--
TOVER
--
--
5
--
TUNDER
--
--
--
5
TUNDER
________________General Description
The MAX6501-MAX6504 fully integrated temperature switches incorporate two temperature-dependent references and a comparator. One reference exhibits a positive temperature coefficient and the other a negative temperature coefficient (Figure 1). 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 die temperature approaches the threshold temperature. The MAX6501/MAX6503 have an activelow, open-drain output structure that can only sink current. The MAX6502/MAX6504 have an active-high, push-pull output structure that can sink or source current. The internal power-on reset circuit guarantees the output is at TTH = +25C state at start-up for 50s. The MAX6501-MAX6504 are available with factorypreset temperature thresholds from -45C to +115C in 10C increments. Table 1 lists the available temperature threshold ranges. The MAX6501/MAX6503 outputs are intended to interface with a microprocessor (P) reset input (Figure 2). The MAX6502/MAX6504 outputs are intended for applications such as driving a fan control (Figure 3).
Table 1. Factory-Programmed Threshold Range
PART MAX6501 MAX6502 MAX6503 MAX6504 THRESHOLD (TTH) RANGE +35C < TTH < +115C +35C < TTH < +115C -45C < TTH < +15C -45C < TTH < +15C
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 approaches the trip point. The HYST pin should not float. Drive HYST close to ground or VCC. Other input voltages cause increased supply current. The actual amount of hysteresis depends on the part's programmed trip threshold. (See the Typical Operating Characteristics graphs.)
4
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
TOVER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK V TOVER MAX6501 WITH 100k PULL-UP
HYST
COLD
+25C
TTH
HOT
TEMP
MAX6501
V TOVER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK TOVER
MAX6502
HYST
COLD
+25C
TTH
HOT
TEMP
MAX6502
MAX6503 WITH 100k PULL-UP
TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK
V TUNDER
HYST
COLD
TTH
+25C
HOT
TEMP
MAX6503
V TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK TUNDER
MAX6504
HYST
COLD
TTH
+25C
HOT
TEMP
MAX6504 Figure 1. Block and Functional Diagrams
_______________________________________________________________________________________
5
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
+3.3V +5V VCC P INT RPULL-UP 100k VCC MAX6501 TOVER HYST GND GND VCC P VCC HYST
HEAT
MAX6502 GND GND TOVER
FAN
SHUTDOWN OR RESET HEAT
Figure 2. Microprocessor Alarm/Reset
Figure 3. Overtemperature Fan Control
Applications Information
Thermal Considerations
The MAX6501-MAX6504 supply current is typically 30A. 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 MAX6501- MAX6504 package and the device being monitored. In some applications, the SOT23-5 package may be small enough to fit underneath a socketed P, allowing the device to monitor the P's temperature directly. The TO-220 package can monitor the temperature of a heat sink directly, and presents the lower thermal resistance of the two packages. 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 MAX6501-MAX6504 die. Heat flows in and out of plastic packages, primarily through the leads. Pin 2 of the SOT23-5 package provides the lowest thermal resistance to the die. Short, wide copper traces leading to the temperature monitor ensure that heat transfers quickly and reliably. The rise in die temperature due to self-heating is given by the following formula: TJ = PDISSIPATION x JA where P DISSIPATION is the power dissipated by the MAX6501-MAX6504, and JA is the package's thermal resistance. The typical thermal resistance is 140C/W for the SOT23-5 package and 75C/W for the TO-220 package. To limit the effects of self-heating, minimize the output currents. For example, if the MAX6501 or MAX6503 sink 1mA, the output voltage is guaranteed to be less than 0.3V. Therefore, an additional 0.3mW of
6
power is dissipated within the IC. This corresponds to a 0.042C shift in the die temperature in the SOT23-5.
Temperature-Window Alarm
The MAX6501-MAX6504 temperature switch outputs assert when the die temperature is outside the factoryprogrammed range. Combining the outputs of two devices creates an over/undertemperature alarm. The MAX6501/MAX6503 and the MAX6502/MAX6504 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 MAX6502/MAX6504 push/pull output stages can be ORed to produce a thermal out-of-range alarm. More favorably, a MAX6501/ MAX6503 can be directly wire-ORed with a single external resistor to accomplish the same task (Figure 4). The temperature window alarms shown in Figure 4 can be used to accurately determine when a device's temperature falls out of the -5C to +75C range. The thermal-overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperaturedependent 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 MAX6501-MAX6504 facilitate the use of multiple temperature monitors to increase system reliability. Figure 5's application uses two MAX6502s with different temperature thresholds to ensure 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 MAX6502 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.
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
+5V VCC MAX6502_ _P075 GND GND HYST TOVER OUT OF RANGE P TUNDER UNDERTEMP MAX6504_ _N005 HYST GND GND HEAT VCC HYST MAX6502_ _P045 +5V RPULL-UP 100k OUT OF RANGE GND GND TOVER FAN CONTROL OVERTEMP HEAT VCC MAX6502_ _P075 GND GND HYST TOVER +5V
TEMPERATURE FAULT
VCC
VCC TOVER MAX6501_ _P075 GND GND HYST TUNDER
VCC
Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature Monitor
MAX6503_ _N005 GND GND HYST
Figure 4. Temperature-Window Alarms
Table 2. Device Marking Codes for SOT23-5 Package
DEVICE MAX6501UKP035 MAX6501UKP045 MAX6501UKP055 MAX6501UKP065 MAX6501UKP075 MAX6501UKP085 MAX6501UKP095 MAX6501UKP105 MAX6501UKP115 MAX6502UKP035 MAX6502UKP045 MAX6502UKP055 MAX6502UKP065 MAX6502UKP075 MAX6502UKP085 MAX6502UKP095 CODE ABZF ABZR ACFW ABZS ACFV ACDP ABZT ACFU ACAG ABZG ABZU ACGC ABZV ACGB ACGA ABZW MINIMUM ORDER 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k 10k 2.5k 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k DEVICE MAX6502UKP105 MAX6502UKP115 MAX6503UKN045 MAX6503UKN035 MAX6503UKN025 MAX6503UKN015 MAX6503UKN005 MAX6503UKP005 MAX6503UKP015 MAX6504UKN045 MAX6504UKN035 MAX6504UKN025 MAX6504UKN015 MAX6504UKN005 MAX6504UKP005 MAX6504UKP015 CODE ACFZ ACFY ADIZ ACAQ ACAP ACFX ACAN ABZX ACAM ACAX ACAW ACAV ACGD ACAT ABZY ADKE MINIMUM ORDER 10k 2.5k 10k 10k 10k 2.5k 10k 2.5k 10k 10k 10k 10k 2.5k 10k 2.5k 10k 7
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501-MAX6504
Selector Guide
PART OUTPUT STAGE TRIP TEMP THRESHOLD -45 STANDARD TEMPERATURE THRESHOLDS (C) -35 -25 -15 -5 +5 +15 +35 +45 +55 +65 +75 +85 +95 +105 +115
1234567 HYST GND GND TOVER VCC (TOVER) ( ) ARE FOR MAX6502. HYST 1234567 GND GND TUNDER VCC (TUNDER)
Pin Configurations
TOP VIEW
MAX6501 MAX6502 MAX6503 MAX6504 OpenDrain Hot Push-Pull Hot OpenDrain Cold Push-Pull Cold TO-220-7
HYST 3 GND 1
5 TOVER GND 1 (TOVER)
5 TUNDER (TUNDER)
GND 2
MAX6501 MAX6502
4 VCC
GND 2
MAX6503 MAX6504
4 VCC
HYST 3
SOT23-5
SOT23-5
TO-220-7
MAX6501 MAX6502
MAX6503 MAX6504
( ) ARE FOR MAX6504.
Chip Information
TRANSISTOR COUNT: 237 SUBSTRATE CONNECTED TO GND
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) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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