View MAX6514UKN025_698027.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-3147; Rev 0; 1/04
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23
General Description
The MAX6514/MAX6515 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 a fixed voltage reference, an analog temperature sensor, and a comparator. They are available with factory-trimmed temperature trip thresholds from -45C to +15C and +35C to +115C in 10C increments, and are accurate to 1C (typ). These devices require no external components and typically consume 22A of supply current. Hysteresis is pin selectable at 2C or 10C. The MAX6514/MAX6515 are offered with hot-temperature thresholds (+35C to +115C), asserting when the temperature is above the threshold or with cold-temperature thresholds (-45C to +15C), asserting when the temperature is below the threshold. The MAX6514/ MAX6515 can be used over a -35C to +125C range with a supply voltage of 2.7V to 5.5V. For applications sensing temperature down to -45C, a supply voltage above 4.5V is required. The MAX6514 has an active-high, push-pull output. The MAX6515 has an active-low, open-drain output. These devices are available in a space-saving 5-pin SOT23 package and operate over the -55C to +125C temperature range.
Features
High-Accuracy +1.5C (max) over -15C to +65C Temperature Range Low-Power Consumption: 22A Typical Current Factory-Programmed Thresholds from -45C to +115C in 10C Increments Open-Drain or Push-Pull Outputs Pin-Selectable 2C or 10C Hysteresis Low Cost
MAX6514/MAX6515
Ordering Information
PART MAX6514UK_ _ _ _-T* MAX6515UK_ _ _ _-T* TEMP RANGE -55C to +125C -55C to +125C PINPACKAGE 5 SOT23-5 5 SOT23-5
Applications
Over/Undertemperature Protection Fan Control Test Equipment Temperature Control Temperature Alarms Notebook, Desktop PCs RAID Servers
*These parts are offered in 16 standard temperature versions with a minimum order of 2500 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 MAX6514UKP065-T describes a MAX6514 in a 5-pin SOT23 package with a +65C threshold in tape and reel (2.5k minimum order). Contact the factory for pricing and availability.
Typical Operating Circuit
VCC
100k VCC TOVER INT VCC
Pin Configurations and Functional Diagram appear at end of data sheet.
0.1F
MAX6515
MICROCONTROLLER
GND GND HYST
GND
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 MAX6514/MAX6515
ABSOLUTE MAXIMUM RATINGS
All Voltages Are Referenced to GND VCC ..........................................................................-0.3V to +6V TOVER, TUNDER (open drain)................................ -0.3V to +6V TOVER, TUNDER (push-pull)....................... -0.3V to VCC + 0.3V HYST .............................................................-0.3V to VCC + 0.3V Continuous Power Dissipation 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW Operating Temperature Range ........................-55C 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, RPULLUP = 100k, (open-drain output only), TA = -55C to +125C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC Hot-temperature thresholds (+35C to +115C) Supply Current ICC Cold-temperature thresholds (-45C to +15C) -15C to +65C Temperature Threshold Accuracy (Note 2) Temperature Threshold Hysteresis HYST Input Threshold (Note 4) Logic Output Voltage High (Push-Pull) Logic Output Voltage Low (Push-Pull and Open Drain) TTH +75C to +115C -45C to -25C (Note 3) THYST VIH VIL VOH VOL ISOURCE = 500A, VCC > 2.7V ISOURCE = 800A, VCC > 4.5V ISINK = 1.2mA, VCC > 2.7V ISINK = 3.2mA, VCC > 4.5V 0.8 x VCC VCC - 1.5 0.3 0.4 HYST = VCC HYST = GND 0.8 x VCC 0.2 x VCC -1.5 -2.5 -3 2 10 CONDITIONS MIN 2.7 22 40 +1.5 +2.5 +3 C V V V C TYP MAX 5.5 40 A UNITS V
Open-Drain Output Leakage VCC = 2.7V, open-drain output = 5.5V 10 nA Current Note 1: 100% production tested at TA = +25C. Specifications over temperature are guaranteed by design. Note 2: The MAX6514/MAX6515 are available with internal factory-programmed temperature trip thresholds from -45C to +15C and +35C to +115C in 10C increments. Note 3: VCC must be greater than 4.5V for a switching threshold of -45C. Note 4: Guaranteed by design.
2
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 MAX6514/MAX6515
Typical Operating Characteristics
(VCC = 4.5V, TA = +25C, unless otherwise noted.)
TRIP THRESHOLD ACCURACY
SAMPLE SIZE = 147 PERCENTAGE OF PARTS SAMPLED (%) 40
MAX6514 toc01
50
SUPPLY CURRENT vs. TEMPERATURE
MAX6514 toc02
30 25 SUPPLY CURRENT (A) 20 15 10 5
30
20
10
0 -1.25 TO -0.75 TO -0.25 TO 0.25 TO 0.75 TO 1.25 TO -1.0 -0.5 -1.5 0.5 1.0 1.5 ACCURACY (C)
0 -55 -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C)
TOVER/TUNDER OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
MAX6514 toc03
TOVER/TUNDER OUTPUT VOLTAGE LOW vs. SINK CURRENT
MAX6514 toc04
5
500
4
400
VOH (V)
2
VOL (V) 0 10
3
300
200
1
100
0 1 2 3 4 5 6 7 8 9 ISINK (mA)
0 0 1 2 3 4 5 6 7 8 9 10 ISINK (mA)
STARTUP AND POWER-DOWN (TEMP < TTH)
MAX6514 toc05
STARTUP DELAY (TEMP > TTH)
MAX6514 toc06
VCC (2V/div)
VCC (2V/div)
TOVER (2V/div)
TOVER (2V/div)
TIME (400s/div)
TIME = 100s
_______________________________________________________________________________________
3
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 MAX6514/MAX6515
Pin Description
PIN MAX6514 1, 2 3 4 5 MAX6515 1, 2 3 4 -- NAME GND HYST VCC TOVER Ground Hysteresis Input. Connect to VCC for 2C of hysteresis or to GND for 10C hysteresis. Input Supply. Bypass to ground with a 0.1F capacitor. Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature exceeds the factory-programmed hot-temperature threshold. Open-Drain, Active-Low Output (Hot Threshold). TOVER goes low when the die temperature exceeds the factory-programmed hot-temperature threshold. Connect to a 100k pullup resistor. Can be pulled up to a voltage higher than VCC. Push-Pull Active-High Output (Cold Threshold). TUNDER goes high when the die temperature falls below the factory-programmed cold-temperature threshold. Open-Drain, Active-Low Output (Cold Threshold). TUNDER goes low when the die temperature goes below the factory-programmed cold-temperature threshold. Connect to a 100k pullup resistor. Can be pulled up to a voltage higher than VCC. FUNCTION
--
5
TOVER
5
--
TUNDER
--
5
TUNDER
Detailed Description
The MAX6514/MAX6515 fully integrated temperature switches incorporate a fixed reference, an analog temperature sensor, and a comparator. Pin-selectable 2C or 10C hysteresis keeps the digital output from oscillating when the die temperature approaches the threshold temperature. The MAX6514 has an activehigh, push-pull output structure that can sink or source current. The MAX6515 has an active-low, open-drain output structure that can only sink current. The internal power-on reset circuit guarantees the logic output is at its +25C state for at least 50s.
Logic Temperature Indicators
Overtemperature Indicator (Hot Thresholds) TOVER and TOVER designations apply to thresholds above T A = +25C (+35C, +45C, +55C, +65C, +75C, +85C, +95C, +105C, and +115C). All "hot" thresholds are positive temperatures. The overtemperature indicator output is open drain active low (TOVER) or push-pull active high (TOVER). TOVER goes low when the die temperature exceeds the factory-programmed temperature threshold. TOVER should be pulled up to a voltage no greater than 5.5V with a 100k pullup resistor. TOVER is a push-pull active-high CMOS output that goes high when the die temperature exceeds the factory-programmed temperature threshold. Undertemperature Indicator (Cold Thresholds) TUNDER and TUNDER designations apply to thresholds below TA = +25C (+15C, +5C, -5C, -15C, -25C, -35C, -45C). The undertemperature indicator output is open-drain, active low (TUNDER) or push-pull, active high (TUNDER). TUNDER goes low when the die temperature goes below the factory-programmed temperature threshold. TUNDER should be pulled up to a voltage no greater than 5.5V with a 100k pullup resistor. TUNDER is a push-pull active-high CMOS output that goes high when the die temperature falls below the factory-programmed temperature threshold.
Hysteresis Input
The HYST input selects the devices' temperature hysteresis and prevents the output from oscillating when the temperature approaches the trip point. Connect HYST to VCC for 2C hysteresis or to GND for 10C hysteresis.
4
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23
Applications Information
Temperature-Window Alarm
The MAX6515 logic output asserts when the die temperature is outside the factory-programmed range. Combining the outputs of two devices creates an over/undertemperature alarm. Two MAX6515s are used to form two complementary pairs, containing one cold trip-point output and one hot trip-point output. The assertion of either output alerts the system to an out-ofrange temperature (Figure 1). The thermal overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperature-dependent function. The typical thermal resistance is +140C/W for the 5pin SOT23 package. To limit the effects of self-heating, minimize the output current. For example, if the MAX6514/MAX6515 sink 1mA, the open-drain output voltage is guaranteed to be less than 0.3V. Therefore, an additional 0.3mW of power is dissipated within the IC. This corresponds to a 0.042C shift in the die temperature in the 5-pin SOT23 package.
+5V 100k OUT OF RANGE VCC TOVER TUNDER VCC
MAX6514/MAX6515
Low-Cost, Fail-Safe Temperature
In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level integration and low cost of the MAX6514/MAX6515 facilitate the use of multiple temperature monitors to increase system reliability. The Figure 2 application uses two MAX6514s with different hot-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 MAX6514 triggers a system shutdown if the die temperature reaches +75C, preventing damage from a wide variety of destructive fault conditions, including latchups, short circuits, and cooling-system failures.
MAX6515UKP075
MAX6515UKN005
GND GND HYST
GND GND HYST
Figure 1. Temperature-Window Alarms Using the MAX6515
+5V
Thermal Considerations
The MAX6514/MAX6515 supply current is typically 22A. When used to drive high-impedance loads, the devices dissipate negligible power and self-heating effects are minimized. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6514/MAX6515 die. Heat flows in and out of plastic packages, primarily through the leads. Pin 2 of the 5-pin SOT23 package provides the lowest thermal resistance to the die. Short, wide copper traces between the MAX6514/MAX6515 and the objects whose temperature is being monitored ensure heat transfers occur 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 MAX6514/MAX6515, and JA is the thermal resistance of the package.
HEAT
VCC TOVER
SYSTEM SHUTDOWN
MAX6514UKP075
GND GND HYST
P
VCC HYST TOVER
FAN CONTROL
GND
MAX6514UKP045
HEAT GND GND
Figure 2. Low-Power, High-Reliability, Fail-Safe Temperature Monitor _______________________________________________________________________________________ 5
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 MAX6514/MAX6515
Table 1. Top Marks
PART MAX6514UKN005 MAX6514UKN015 MAX6514UKN025 MAX6514UKN035 MAX6514UKN045 MAX6514UKP005 MAX6514UKP015 MAX6514UKP035 MAX6514UKP045 MAX6514UKP055 MAX6514UKP065 MAX6514UKP075 MAX6514UKP085 MAX6514UKP095 MAX6514UKP105 MAX6514UKP115 TOP MARK AEKU AEKV AEKW AECV AEKX AEKY AEKZ AELA AELB AELC AELD AECW AELE AELF AELG AELH PART MAX6515UKN005 MAX6515UKN015 MAX6515UKN025 MAX6515UKN035 MAX6515UKN045 MAX6515UKP005 MAX6515UKP015 MAX6515UKP035 MAX6515UKP045 MAX6515UKP055 MAX6515UKP065 MAX6515UKP075 MAX6515UKP085 MAX6515UKP095 MAX6515UKP105 MAX6515UKP115 TOP MARK AEMK AEML AEMM AECX AEMN AEMO AEMP AEMQ AEMR AEMS AEMT AECY AEMU AEMV AEMW AEMX
Pin Configurations
TOP VIEW
HOT THRESHOLDS (+35C TO +115C) GND 1 5 (TOVER) TOVER COLD THRESHOLDS (-45C TO +15C) GND 1 5 (TUNDER) TUNDER
GND 2
(MAX6514) MAX6515
4 VCC
GND 2
(MAX6514) MAX6515
4 VCC
HYST 3
HYST 3
SOT23
SOT23
6
_______________________________________________________________________________________
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23
MAX6514/MAX6515 Functional Diagram
V TOVER NEGATIVE TEMPCO SENSOR FIXED REFERENCE HYST NETWORK TOVER MAX6514 (HOT THRESHOLD)
MAX6514/MAX6515
MAX6514
HYST COLD +25C TTH HOT TEMP
V TOVER NEGATIVE TEMPCO SENSOR FIXED REFERENCE HYST NETWORK TOVER
MAX6515 (HOT THRESHOLD) WITH 100k PULLUP
MAX6515
HYST COLD V TUNDER +25C TTH HOT TEMP
MAX6514 (COLD THRESHOLD)
NEGATIVE TEMPCO SENSOR FIXED REFERENCE HYST NETWORK
TUNDER
MAX6514
HYST COLD TTH +25C HOT TEMP
V TUNDER NEGATIVE TEMPCO SENSOR FIXED REFERENCE HYST NETWORK TUNDER
MAX6515 (COLD THRESHOLD) WITH 100k PULLUP
MAX6515
HYST COLD TTH +25C HOT TEMP
Chip Information
TRANSISTOR COUNT: 1808 PROCESS: BiCMOS
_______________________________________________________________________________________ 7
Low-Cost, 2.7V to 5.5V Temperature Switches in a SOT23 MAX6514/MAX6515
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.)
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
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) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT-23 5L .EPS

▲Up To Search▲

Price & Availability of MAX6514UKN025

	To Download MAX6514UKN025 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .