CONFIDENTIAL
AQ265
Adjustable
Hot- Cold
Thermostat
SOT23-5 Package
Preliminary Specification
Revision 1.5
January 31, 2007
General Description
Specifically design to reside in battery packs,
the
device AQ265 is used to stop the charge or discharge
of a battery when the battery temperature is outside of
the safe temperature range.
The AQ265 is an accurate low-power solid-state
thermostat that provides shut down alarm at both cold
and hot temperatures. It features very low standby
current, which
prolongs battery shelf life.
The hot
temperature trip point is 40ºC and can be adjusted
with one external resistor from 40ºC to 90ºC. The cold
trip point is -20ºC and can be adjusted with one
external resistor from -20ºC to 15ºC. Thermal
hysteresis is internally programmed to guarantee
stability at the transition points.
At temperatures between its hot and cold trip points,
the AQ265 lies quietly with open drain while drawing
ICC of only 20µA. When either the hot or cold
threshold temperature is reached the OUT pin will sink
>200µA providing a low power signal to disconnect the
battery from its load and/or charger.
Applications
•
•
Battery Packs and Chargers
Electronic System protection
Features
•
•
•
•
•
•
•
20µA off state current, prolongs battery shelf life
+/-3 degrees Celsius accuracy
Adjustable Hot and cold temperature trip points
Internally programmed thermal hysteresis
Excellent power supply noise rejection
Offered in very small SOT23-5 package.
RoHS Compliant
Block Diagram
www.acutechnology.com
AQ265
Acutechnology Semiconductor Inc.
AQ265
Pin Configuration
Pin Descriptions
Pin
num
1
2
3
4
5
Pin
Name
COLD
ADJ
GND
HOT
ADJ
VCC
OUT
Function
Adjust pin, connects to lower temperature adjust resistor
Ground
Adjust pin, connects to high temperature adjust resistor
V supply. Must be greater than 2.4V for normal operation.
Normally Open Drain, V
DSS
when thermal threshold is reached.
Ordering Information
Hot
Device
AQ265
Note:
The
Cold
T
THRESH
R
ANGE
-20 < 15ºC
Tol.
±
3ºC
Operating Tj
-55ºC
≤
150ºC
T
THRESH
R
ANGE
40 < 90ºC
PKG
Type
SOT-23-5
Wrap
T&R
Ordering Number
AQ265GY-M5-AJ-TRL
TRL parts are Lead Free and RoHS compliant.
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2
Rev. 1.5 January 31, 2007
Acutechnology Semiconductor Inc.
AQ265
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
V
CC
Voltage
V
OUT
Voltage
I
OUT
Current
Cold
ADJ
Current
Hot
ADJ
Current
Operating Junction Temperature
Lead Temperature (soldering 10 seconds)
Storage Temperature Range
Value
18
18
10
10
10
155
260
-65 to +150
Units
V
V
mA
mA
mA
ºC
ºC
ºC
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 COLD ADJ = HOTADJ = no connect, Tj =25ºC
Symbol
Parameter
Input Current
Input Current
Input Voltage
Output on V
OUT
Output on I
OUT
Output leakage
current
Hot temp Threshold
Hot temp range
Hysteresis
Cold temp Threshold
Cold temp range
Hysteresis
Adjusted by resistor
(2)
Tj =
Tj =
-23
-20
+3
I
OUT
= 100µA, Tj outside the trip
temperatures
V
OUT
= 2.2V, Tj outside the trip
temperatures
VCC = 16V, Tj inside the trip
temperatures
Unadjusted
Adjusted by resistor
(1)
Tj =
Tj =
Tj outside trip temperatures
2.4
0.15
100
350
0.2
37
40
-5
-20
-17
15
40
Conditions
Min
Typ
20
20
Max
30
30
16
0.25
600
0.4
43
90
Units
µA
µA
V
V
µA
µA
ºC
ºC
ºC
ºC
ºC
ºC
I
VCC
I
VCC
V
CC
V
OUT
I
OUT
I
OUT
O
TT
O
TR
H
OT
U
TT
U
TR
H
UT
Notes:
1) The over temperature trip point is adjusted with a resistor from HOT
ADJ
to GND (see graph 1)
2) The under temperature trip point is adjusted with a resistor from COLD
ADJ
to GND (see graph 2)
3) For an accurate RSET to adjust temperature email required temperature to
info@acutechnology.com
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3
Rev. 1.5 January 31, 2007
Acutechnology Semiconductor Inc.
AQ265
Typical Application
The device AQ265 is very simple to use. It is recommended to place the AQ265 in close proximity of the device
whose temperature is to be sensed. The device AQ265 has an open drain output, which is capable of sinking
greater than 200µA when the sensed temperature exceeds the Hot temp trip point or goes below the Cold temp
trip point. The Hot and Cold temperature trip points can be set by the addition of external resistors RSET as
depicted in FIG.1 below. 1nF capacitors must be placed from the adjust pins to ground close to the AQ265 for
noise immunity.
FIG.1
SETTING THE HOT TEMPERATURE TRIP POINT
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. To determine the desired Hot
temperature trip point, the resistor RSET value should be selected according to the graph below. The graph
shows the desired resistor value for the temperature range between 50ºC and 85ºC. If no external resistor is
selected, the Hot temperature trip point will be 40ºC. For an accurate RSET email
info@acutechnology.com
RSET vs Hot Thresh.
90.0
85.0
Temperature C
80.0
75.0
70.0
65.0
60.0
55.0
50.0
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
RSET in Kohms
GRAPH.1
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Rev. 1.5 January 31, 2007
Acutechnology Semiconductor Inc.
AQ265
SETTING THE COLD TEMPERATURE TRIP POINT
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. To determine the desired Cold
temperature trip point, the resistor RSET value should be selected according to the graph below. The graph
shows the desired resistor value for the temperature range between -10ºC and 10ºC. If no external resistor is
selected the Cold temperature trip point will be -20ºC. For an accurate RSET email
info@acutechnology.com.
RSET vs Lower Thresh.
30.0
25.0
20.0
Temperature C
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
500
700
900
1100
1300
1500
1700
1900
RSET in Kohms
GRAPH.2
The AQ265 is designed to present the lowest possible current drain to the battery. ICC is less than 30µA under
all conditions. OUT pin is designed to pull down with a minimum of 200µA. To insure the desired low state
output voltage, the current required to pull down the element used to disconnect the Battery must be
determined and is referred to as I load.
Selection of the R1 pull up resistor must allow for I load when the OUT engages into the alarm state, meaning
the device is sensing temperatures outside of its set temperature window. The OT pin is guaranteed to sink a
minimum of 100µA to keep the current drain as low as possible. Therefore, I load plus I R1 must not exceed
100µA or a true logic low may not be achieved when the AQ265 alarms an out of window temperature has been
sensed.
R1= (Vbatt. min - Max. V
OUT
on) / (Min. I
OUT
on – (1.5* I load)) = (Vbatt. min - 0.25V) / (100µA – (1.5* I load))
Graph 3
below shows the hysteretic response of the OUT pin to temperature. In the normal range between the
Cold and Hot trip points, the AQ265 presents an open Drain high state at the OUT pin. At the cold temperature
trip point, V
OUT
will drop to its low state. The OUT pin will return to a high state when the AQ265 senses the
temperature has risen above the Cold trip point by + 3 degrees of hysteresis. Likewise, the AQ265 will cause
the OUT pin to go low state when the Hot temperature trip point is exceeded. OUT will return to high state when
the AQ265 senses that the temperature is below the high trip point by - 5 degrees of hysteresis.
Graph 4
shows the input current into the AQ265 and output state over the temperature range.
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Rev. 1.5 January 31, 2007
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