ACUTECH AQ297GY-M5-AJ-TR 3âºc accurate with hysteresis adjustable thermostat sot23-5 package Datasheet

AQ297
3ºC Accurate with Hysteresis
Adjustable Thermostat
SOT23-5 Package
Product Specification
Revision 1.1
General Description
The device AQ297 is an adjustable accurate lowpower solid-state thermostat. The temperature trip
point can be set with one external resistor from 50ºC
to 150ºC with an accuracy of 3 degrees. The thermal
hysteresis is internally programmed to guarantee
stability at the transition point.
The device AQ297 is used to protect systems from
overheating above the normal rating of components like
capacitors, batteries, or any other temperature
sensitive component. The device AQ297 is also used in
battery management systems to stop the battery
charge when the battery temperature is outside of the
safe temperature range.
The output OT is an open drain output that can sink up
to 50mA when the threshold temperature is reached.
The minimum voltage of operation is 2.2 V.
October 08, 2006
Applications
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Battery Chargers
Electronic System protection
Fan Control
Microprocessor Thermal Management
HVAC Systems
Features
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+/-3 degrees Celsius accuracy
Adjustable temperature trip point
Open-drain output capable of 50mA
Internally programmed thermal hysteresis
Low input voltage and current
Excellent power supply noise rejection
Offered in very small SOT23-5 package.
RoHS Compliant
Block Diagram
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AQ297
AQ297
Acutechnology Semiconductor Inc.
Pin Configuration
Pin Descriptions
Pin
num
Pin
Name
1
TREF
Reference connects to temperature adjust resistor
2
GND
Ground
3
TADJ
Adjust pin, connects to temperature adjust resistor
4
VCC
V supply. Must be greater than 2.2V for normal operation.
5
OT
Function
Normally Open Drain, VDSS when thermal threshold is reached.
Ordering Information
Device
Operating Tj
Initial
TTHRESH
Adjusted
TTHRESH
Tol.
PKG
Type
Wrap
Ordering Number
AQ297
-55ºC ≤ 150ºC
120ºC
50-150ºC
± 3ºC
SOT-23-5
T&R
AQ297GY-M5-AJ-TR
± 3ºC
Note: The TRL parts are Lead Free and RoHS compliant.
SOT-23-5
T&R
AQ297GY-M5-AJ-TRL
AQ297
-55ºC ≤ 150ºC
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120ºC
50-150ºC
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Rev. 1.1 October 08, 2006
AQ297
Acutechnology Semiconductor Inc.
Absolute Maximum Ratings
Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These stress ratings only, and functional operation of the device at these or any conditions beyond
those indicated under recommended Operating Conditions is not implied. Exposure to “Absolute Maximum
Rating” for extended periods may affect device reliability. Use of standard ESD handling precautions is
required.
Parameter
Value
Units
VCC Voltage
18
V
VOT Voltage
18
V
IOT Current
80
mA
ITREF Current
10
mA
ITADJ Current
10
mA
Operating Junction Temperature
155
ºC
Lead Temperature (soldering 10 seconds)
260
ºC
-65 to +150
ºC
Storage Temperature Range
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range -55ºC <Tj<150ºC unless otherwise
stated. Ambient temperature must be de-rated based upon power dissipation and package thermal
characteristics. Unless otherwise specified: VCC = 5V, TREF and TADJ = no connect, Tj =25ºC
Symbol
Parameter
Conditions
Min
Typ
Max
Units
80
120
µA
1.5
2.0
mA
16
V
IVCC
Input Current
IVCC
Input Current
VCC
Input Voltage
VOT
Output VDSS
IC = 10mA Tj > trip
temperature
0.15
0.25
V
IOT
Output leakage current
VCC = 16V
0.2
0.4
µA
OTT
Over temp Threshold
Unadjusted
120
123
ºC
TOT
Over temp accuracy
Adjusted
3
ºC
HOT
Hysteresis
Tj > trip temperature
2.2
117
-3
5
ºC
Notes:
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Rev. 1.1 October 08, 2006
AQ297
Acutechnology Semiconductor Inc.
Typical Application
The device AQ297 is very simple to use. It is recommended to place the AQ297 in close proximity of the device
whose temperature is to be sensed. The device AQ297 has an open drain output which is capable of sinking up
to 50mA when the sensed temperature exceeds the trip point. The temperature trip point can be set by the
addition of an external resistor RSET between the TREF and the TADJ pins as depicted in FIG.1 below.
FIG.1
It is assumed that the temperature coefficient of the external resistor be close to zero as it commonly is.
Higher accuracy resistors guarantee higher accuracy temperature trip point.
The resistor RSET value should be selected according to the table below to determine the desired temperature
trip point. The table in particular shows the desired resistor value for the temperature range between 50ºC and
80ºC. If no external resistor is selected the temperature trip point will be 120ºC.
RSET vs Tthresh.
90.0
85.0
Temperature C
80.0
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
70.0
90.0
110.0
130.0
150.0
170.0
190.0
210.0
RSET in Kohms
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Rev. 1.1 October 08, 2006
AQ297
Acutechnology Semiconductor Inc.
Package Dimensions
SOT23-3, SOT23-4, SOT23-5, SOT23-6
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Rev. 1.1 October 08, 2006
AQ297
Acutechnology Semiconductor Inc.
Contact Information
Acutechnology Semiconductor Inc.
3487 McKee Rd. Suite 52
San Jose CA , USA 95127
TEL: (408) 259-2300
FAX: (408) 259-9160
website: www.acutechnology.com
Disclaimer
The information furnished by Acutechnology in this data sheet is believed to be accurate and reliable. However,
Acutechnology assumes no responsibility for its use. Acutechnology reserves the right to change circuitry and specifications
at any time without notification to the customer.
Life Support Policy
Acutechnology Products are not designed or authorized for use as components in life support devices or systems where
malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are
devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to
perform can be reasonably expected to result in a significant injury to the user.
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Rev. 1.1 October 08, 2006
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