MAX6502CMP005 [MAXIM]
Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220; 低成本, + 2.7V至+ 5.5V ,微功耗温度开关,SOT23封装和TO -220型号: | MAX6502CMP005 |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 |
文件: | 总8页 (文件大小:399K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-1280; Rev 2; 11/99
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
________________General Description
____________________________Features
The MAX6501–MAX6504 low-cost, fully integrated tem-
perature 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 -45°C
to +115°C in 10°C increments, and are accurate to
0.5°C ꢀtypꢁ or 6°C ꢀmaꢂꢁ. These devices reꢃuire no
eꢂternal components and typically consume 30µA sup-
ply current. Hysteresis is pin-selectable at +2°C or
+10°C.
ꢀ
0.5°C (typical) Threshold Accuracy Over
Full Temperature Range
ꢀ No External Components Required
ꢀ Low Cost
ꢀ 30µA Supply Current
ꢀ Factory-Programmed Thresholds from
-45°C to +115°C in 10°C Increments
ꢀ Open-Drain Output (MAX6501/MAX6503)
Push-Pull Output (MAX6502/MAX6504)
ꢀ Pin-Selectable +2°C or +10°C Hysteresis
ꢀ SOT23-5 and TO220-7 Packages
The MAX6501/MAX6503 have an active-low, open-drain
output intended to interface with a microprocessor ꢀµPꢁ
reset input. The MAX6502/MAX6504 have an active-
high, push-pull output intended to directly drive fan-
control logic. The MAX6501/MAX6502 are offered with
hot-temperature thresholds ꢀ+35°C to +115°Cꢁ, assert-
ing when the temperature is above the threshold. The
MAX6503/MAX6504 are offered with cold-temperature
thresholds ꢀ-45°C to +15°Cꢁ, asserting when the tem-
perature is below the threshold.
Ordering Information
PART*
TEMP. RANGE
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
MAX6501UK_ _ _ _-T
-55°C to +125°C
MAX6501CM_ _ _ _-T -55°C to +125°C
MAX6502UK_ _ _ _-T
-55°C to +125°C
MAX6502CM_ _ _ _-T -55°C to +125°C
MAX6503UK_ _ _ _-T
-55°C to +125°C
MAX6503CM_ _ _ _-T -55°C to +125°C
MAX6504UK_ _ _ _-T
-55°C to +125°C
MAX6504CM_ _ _ _-T -55°C to +125°C
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.
Typical Operating Circuit
*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 +65°C threshold. Contact the factory for
pricing and availability of nonstandard temperature versions (mini-
mum order 10,000 pieces).
+2.7V TO +5.5V
V
V
CC
CC
MAX6502
TOVER
µP
INT
GND GND HYST
GND
________________________Applications
µP Temperature Monitoring in High-Speed
Computers
Temperature Control
Temperature Alarms
Fan Control
Selector Guide and Pin Configurations appear at end of
data sheet.
†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
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ꢀV ꢁ ...............................................-0.3V to +7V
Output Current ꢀall pinsꢁ .....................................................20mA
CC
TOVER ꢀMAX6501ꢁ...................................................-0.3V to +7V
Continuous Power Dissipation ꢀT = +70°Cꢁ
A
TOVER ꢀMAX6502ꢁ.....................................-0.3V to ꢀV
+ 0.3Vꢁ
5-Pin SOT23-5 ꢀderate 7.1mW/°C above +70°Cꢁ .........571mW
Operating Temperature Range .........................-55°C to +125°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature ꢀsoldering, 10secꢁ .............................+300°C
CC
TUNDER ꢀMAX6503ꢁ ................................................-0.3V to +7V
TUNDER ꢀMAX6504ꢁ ..................................-0.3V to ꢀV
All Other Pins..............................................-0.3V to ꢀV
+ 0.3Vꢁ
+ 0.3Vꢁ
CC
CC
Input Current ꢀall pinsꢁ ........................................................20mA
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
ꢀV
= +2.7V to +5.5V, R
= 100kΩ ꢀMAX6501/MAX6503 onlyꢁ, T = T
to T
, unless otherwise noted. Typical values are
MAX
CC
PULL-UP
A
MIN
at T = +25°C.ꢁ ꢀNote 1ꢁ
A
PARAMETER
Supply Voltage Range
Supply Current
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
85
6
UNITS
V
V
2.7
CC
CC
I
30
0.5
0.5
0.5
0.5
2
µA
-45°C to -25°C
-15°C to +15°C
+35°C to +65°C
-6
-4
-4
-6
4
Temperature Threshold
Accuracy ꢀNote 2ꢁ
∆T
TH
°C
4
+75°C to +115°C
HYST = GND
6
Temperature Threshold
Hysteresis
T
HYST
°C
V
HYST = V
10
CC
V
IH
0.8 ꢂ V
0.8 ꢂ V
CC
HYST Input Threshold
ꢀNote 3ꢁ
V
IL
0.2 ꢂ V
CC
I
= 500µA, V
> 2.7V
SOURCE
CC
CC
ꢀMAX6502/MAX6504 onlyꢁ
Output Voltage High
V
OH
V
I
= 800µA, V > 4.5V
SOURCE
CC
V
- 1.5
CC
ꢀMAX6502/MAX6504 onlyꢁ
I
I
= 1.2mA, V
= 3.2mA, V
> 2.7V
> 4.5V
0.3
0.4
SINK
CC
Output Voltage Low
V
OL
V
SINK
CC
Open-Drain Output Leakage
Current
V
V
= 2.7V, V
= 5.5V ꢀMAX6503ꢁ,
TUNDER
CC
10
nA
= 5.5V ꢀMAX6501ꢁ
TOVER
Note 1: 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.
A
Note 2: The MAX6501–MAX6504 are available with internal, factory-programmed temperature trip thresholds from -45°C to +115°C
in +10°C increments (see Selector Guide).
Note 3: Guaranteed by design.
2
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
__________________________________________Typical Operating Characteristics
ꢀV
= +5V, R
= 100kΩ ꢀMAX6501/MAX6503ꢁ, T = +25°C, unless otherwise noted.ꢁ
CC
PULL-UP
A
MAX6502/MAX6504
OUTPUT SOURCE RESISTANCE
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
TRIP THRESHOLD ACCURACY
60
50
40
30
20
10
0
40
35
30
25
20
15
10
5
800
700
600
500
400
300
200
100
0
SAMPLE SIZE = 300
V
= 2.7V
CC
V
V
= 3.3V
= 5.0V
CC
CC
0
-5 -4 -3 -2 -1
0
1
2
3
4
5
-55
-25
5
35
65
95
125
-55
-25
5
35
65
95
125
ACCURACY (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT SINK RESISTANCE
vs. TEMPERATURE
SOT23 THERMAL STEP RESPONSE
IN PERFLUORINATED FLUID
SOT23 THERMAL STEP RESPONSE
IN STILL AIR
MAX6501 TOC4
MAX6501 TOC5
160
140
120
100
80
V
= 2.7V
CC
+100°C
+100°C
V
= 3.3V
CC
+12.5°C/div
+15°C/div
V
= 5.0V
60
CC
2
2
MOUNTED ON 0.75in
OF 2 oz. COPPER
40
MOUNTED ON 0.75in
OF 2 oz. COPPER
20
+25°C
+25°C
0
5sec/div
-55
-25
5
35
65
95
125
20sec/div
TEMPERATURE (°C)
HYSTERESIS
vs. TRIP TEMPERATURE
MAX6501 START-UP AND POWER-DOWN
MAX6501 START-UP DELAY
(T > T
(T < T
)
)
TH
TH
MAX6501 TOC07
MAX6501 TOC07A
16
14
12
10
8
MAX6503
MAX6504
HYST = V
MAX6501
MAX6502
HYST = V
CC
CC
A
B
A
B
6
MAX6501
MAX6502
HYST = GND
MAX6503
MAX6504
HYST = GND
4
2
0
-45 -25 -5 15 35 55 75 95 115
TRACE A: TOVER VOLTAGE, R
= 100kΩ
TRACE A: TOVER VOLTAGE, R
= 100kΩ
PULL-UP
PULL-UP
TRACE B: V PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT
TRIP TEMPERATURE (°C)
TRACE B: V PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT
CC
CC
_______________________________________________________________________________________
3
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
Pin Description
PIN
NAME
FUNCTION
MAX6501 MAX6502 MAX6503 MAX6504
Ground. Not internally connected. Tie both ground pins togeth-
er close to the chip. Pin 2 provides the lowest thermal resis-
tance to the die.
1, 2
1, 2
1, 2
1, 2
GND
Hysteresis Input. Connect HYST to GND for +2°C hysteresis, or
3
4
3
4
3
4
3
4
HYST
connect to V
for +10°C hysteresis.
CC
V
CC
Supply Input ꢀ+2.7V to +5.5Vꢁ
Open-Drain, Active-Low Output. TOVER goes low when the die
temperature eꢂceeds the factory-programmed temperature
threshold. Connect to a 100kΩ pull-up resistor. May be pulled
5
—
5
—
—
5
—
—
—
5
TOVER
TOVER
up to a voltage higher than V
.
CC
Push-Pull Active-High Output. TOVER goes high when the die tem-
perature eꢂceeds the factory-programmed temperature threshold.
—
—
—
Open-Drain, Active-Low Output. TUNDER goes low when the
die temperature goes below the factory-programmed tempera-
ture threshold. Connect to a 100kΩ pull-up resistor. May be
—
—
TUNDER
TUNDER
pulled up to a voltage higher than V
.
CC
Push-Pull Active-High Output. TUNDER goes high when the die tem-
perature falls below the factory-programmed temperature threshold.
—
________________General Description
Table 1. Factory-Programmed Threshold
Range
The MAX6501–MAX6504 fully integrated temperature
switches incorporate two temperature-dependent refer-
ences and a comparator. One reference eꢂhibits a pos-
itive temperature coefficient and the other a negative
temperature coefficient ꢀFigure 1ꢁ. The temperature at
which the two reference voltages are eꢃual determines
the temperature trip point. Pin-selectable +2°C or
+10°C hysteresis keeps the output from oscillating
when the die temperature approaches the threshold
temperature. The MAX6501/MAX6503 have an active-
low, open-drain output structure that can only sink cur-
rent. The MAX6502/MAX6504 have an active-high,
push-pull output structure that can sink or source cur-
rent. The internal power-on reset circuit guarantees the
PART
THRESHOLD (T ) RANGE
TH
MAX6501
MAX6502
MAX6503
MAX6504
+35°C < T < +115°C
TH
+35°C < T < +115°C
TH
-45°C < T < +15°C
TH
-45°C < T < +15°C
TH
Hysteresis Input
The HYST pin is a CMOS-compatible input that selects
hysteresis at either a high level ꢀ+10°C for HYST = V
ꢁ
CC
or a low level ꢀ+2°C for HYST = GNDꢁ. Hysteresis pre-
vents the output from oscillating when the temperature
approaches the trip point. The HYST pin should not
output is at T = +25°C state at start-up for 50µs.
TH
float. Drive HYST close to ground or V . Other input
CC
The MAX6501–MAX6504 are available with factory-
preset temperature thresholds from -45°C to +115°C in
10°C increments. Table 1 lists the available temperature
threshold ranges. The MAX6501/MAX6503 outputs are
intended to interface with a microprocessor ꢀµPꢁ reset
input ꢀFigure 2ꢁ. The MAX6502/MAX6504 outputs are
intended for applications such as driving a fan control
ꢀFigure 3ꢁ.
voltages cause increased supply current. The actual
amount of hysteresis depends on the part’s pro-
grammed trip threshold. ꢀSee the Typical Operating
Characteristics graphs.ꢁ
4
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
V
MAX6501
WITH 100kΩ PULL-UP
TOVER
TOVER
POSITIVE
TEMPCO
REFERENCE
NEGATIVE
TEMPCO
REFERENCE
HYST
NETWORK
HYST
TEMP
TEMP
TEMP
TEMP
COLD +25°C
T
HOT
TH
MAX6501
V
MAX6502
TOVER
TOVER
HYST
POSITIVE
TEMPCO
REFERENCE
NEGATIVE
TEMPCO
HYST
NETWORK
REFERENCE
COLD +25°C
T
HOT
TH
MAX6502
MAX6503
WITH 100kΩ PULL-UP
V
TUNDER
TUNDER
POSITIVE
TEMPCO
REFERENCE
NEGATIVE
TEMPCO
REFERENCE
HYST
NETWORK
HYST
COLD
T
+25°C
HOT
TH
MAX6503
V
MAX6504
TUNDER
TUNDER
HYST
POSITIVE
TEMPCO
REFERENCE
NEGATIVE
TEMPCO
REFERENCE
HYST
NETWORK
COLD
T
+25°C
HOT
TH
MAX6504
Figure 1. Block and Functional Diagrams
_______________________________________________________________________________________
5
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
+3.3V
+5V
V
V
HYST
CC
CC
R
V
V
CC
PULL-UP
100k
CC
µP
FAN
HEAT
µP
MAX6501
TOVER
INT
MAX6502
GND GND TOVER
SHUTDOWN
OR
RESET
HYST GND GND
HEAT
Figure 2. Microprocessor Alarm/Reset
Figure 3. Overtemperature Fan Control
power is dissipated within the IC. This corresponds to a
0.042°C shift in the die temperature in the SOT23-5.
Applications Information
Thermal Considerations
The MAX6501–MAX6504 supply current is typically
30µA. 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 monitor-
ing 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 µP, allowing the
device to monitor the µP’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 µP, assert an interrupt, or trigger an eꢂternal alarm.
Temperature-Window Alarm
The MAX6501–MAX6504 temperature switch outputs
assert when the die temperature is outside the factory-
programmed 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 con-
taining 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 ther-
mal out-of-range alarm. More favorably, a MAX6501/
MAX6503 can be directly wire-ORed with a single eꢂter-
nal resistor to accomplish the same task ꢀFigure 4ꢁ.
The temperature window alarms shown in Figure 4 can
be used to accurately determine when a device’s tem-
perature falls out of the -5°C to +75°C range. The ther-
mal-overrange signal can be used to assert a thermal
shutdown, power-up, recalibration, or other temperature-
dependent function.
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 tem-
perature monitor ensure that heat transfers ꢃuickly and
reliably.
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 in-
crease 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 tempera-
ture monitor activates the fan when the die temperature
eꢂceeds +45°C. The second MAX6502 triggers a system
shutdown if the die temperature reaches +75°C. The
second temperature monitor’s output asserts when a
wide variety of destructive fault conditions occur, includ-
ing latchups, short circuits, and cooling-system failures.
The rise in die temperature due to self-heating is given
by the following formula:
∆T = P
ꢂ θ
JA
J
DISSIPATION
where P
is the power dissipated by the
DISSIPATION
MAX6501–MAX6504, and θ is the package’s thermal
JA
resistance.
The typical thermal resistance is 140°C/W for the
SOT23-5 package and 75°C/W for the TO-220 pack-
age. To limit the effects of self-heating, minimize the
output currents. For eꢂample, 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
_______________________________________________________________________________________
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
+5V
+5V
V
CC
V
CC
MAX6502_ _P075
GND
GND
HYST
MAX6502_ _P075
HEAT
OVERTEMP
TEMPERATURE
FAULT
GND
TOVER
TOVER
OUT OF RANGE
GND
HYST
µP
V
TUNDER
CC
UNDERTEMP
FAN
MAX6504_ _N005
HYST
GND
CONTROL
HEAT
V
TOVER
CC
HYST
GND
MAX6502_ _P045
+5V
GND GND
R
PULL-UP
100k
OUT OF RANGE
V
CC
V
CC
Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor
TOVER
TUNDER
MAX6501_ _P075
MAX6503_ _N005
GND
GND HYST
GND GND HYST
Figure 4. Temperature-Window Alarms
Table 2. Device Marking Codes for SOT23-5 Package
MINIMUM
MINIMUM
ORDER
DEVICE
CODE
DEVICE
CODE
ORDER
MAX6501UKP035
MAX6501UKP045
MAX6501UKP055
MAX6501UKP065
MAX6501UKP075
MAX6501UKP085
MAX6501UKP095
MAX6501UKP105
MAX6501UKP115
MAX6502UKP035
MAX6502UKP045
MAX6502UKP055
MAX6502UKP065
MAX6502UKP075
MAX6502UKP085
MAX6502UKP095
ABZF
ABZR
ACFW
ABZS
ACFV
ACDP
ABZT
ACFU
ACAG
ABZG
ABZU
ACGC
ABZV
ACGB
ACGA
ABZW
10k
MAX6502UKP105
MAX6502UKP115
MAX6503UKN045
MAX6503UKN035
MAX6503UKN025
MAX6503UKN015
MAX6503UKN005
MAX6503UKP005
MAX6503UKP015
MAX6504UKN045
MAX6504UKN035
MAX6504UKN025
MAX6504UKN015
MAX6504UKN005
MAX6504UKP005
MAX6504UKP015
ACFZ
ACFY
ADIZ
10k
2.5k
10k
10k
10k
2.5k
10k
2.5k
10k
10k
10k
10k
2.5k
10k
2.5k
10k
2.5k
2.5k
2.5k
2.5k
2.5k
2.5k
10k
ACAQ
ACAP
ACFX
ACAN
ABZX
ACAM
ACAX
ACAW
ACAV
ACGD
ACAT
ABZY
ADKE
2.5k
10k
2.5k
2.5k
2.5k
2.5k
2.5k
2.5k
_______________________________________________________________________________________
7
Low-Cost, +2.7V to +5.5V, Micropower
Temperature Switches in SOT23 and TO-220
Selector Guide
Pin Configurations
PART
MAX6501 MAX6502 MAX6503 MAX6504
TOP VIEW
OUTPUT
STAGE
Open-
Drain
Open-
Drain
Push-Pull
Hot
Push-Pull
Cold
GND
GND
1
2
3
5
4
TOVER
(TOVER)
GND
GND
1
2
3
5
4
TUNDER
TRIP TEMP
THRESHOLD
Hot
Cold
(TUNDER)
MAX6501
MAX6502
MAX6503
MAX6504
-45
-35
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
-25
HYST
V
HYST
V
CC
CC
-15
-5
SOT23-5
TO-220-7
SOT23-5
TO-220-7
+5
+15
+35
+45
+55
+65
+75
+85
+95
+105
+115
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
MAX6501
MAX6502
MAX6503
MAX6504
1 2 3 4
5
6 7
1 2 3 4
5
6 7
TOVER
(TOVER)
V
CC
HYST GND
V
HYST GND
GND
GND TUNDER
(TUNDER)
CC
( ) ARE FOR MAX6502.
( ) 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
© 1999 Maꢂim Integrated Products
Printed USA
is a registered trademark of Maꢂim Integrated Products.
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