MAX6505UTP110+T Maxim Integrated Products, MAX6505UTP110+T Datasheet - Page 5

• Manufacturer Part Number: MAX6505UTP110+T
• Description: IC TEMP SWITCH DL TRIP SOT23-6
• Manufacturer: Maxim Integrated Products

Specifications of MAX6505UTP110+T

• Function: Temp Switch
• Topology: Comparator, Voltage Reference
• Sensor Type: Internal
• Sensing Temperature: 110°C Trip Point
• Output Type: Active Low/Open Drain
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Temperature Threshold: + 110 C
• Full Temp Accuracy: +/- 0.5 C
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX6505–MAX6508 fully integrated temperature
switches incorporate two temperature-dependent refer-
ences and a comparator. One reference exhibits a pos-
itive temperature coefficient and the other a negative
temperature coefficient. The temperature at which the
two reference voltages are equal determines the tem-
perature trip point. There are two versions, each of
which has two logic outputs.
The MAX6505/MAX6506 have a main trip point (T
and a lower, “warning” trip point (T
temperature rises above these trip points, the ALARM
and WARN outputs are asserted (Figure 1). The differ-
ence between the two trip points (ΔT
table to +5°C, +10°C, +20°C, or +30°C by connecting
the two control pins (S0 and S1) high or low (Table 1).
MAX6505 has open-drain active-low outputs; MAX6506
has push-pull active-high outputs.
The MAX6507/MAX6508 have two factory-programmed
threshold temperatures (T
outputs (OK and OVER). One output (OK) asserts
when the temperature is between T
The other output (OVER) asserts when the temperature
is above T
mine the part numbers associated with specific values
of T
lower trip point (T
higher trip point (T
DER
number MAX6508UTA04B (Table 4 and Figure 2).
MAX6507 has open-drain outputs; MAX6508 has push-
pull outputs.
The temperature threshold hysteresis for the ALARM
output of the MAX6505/MAX6506 is 2°C. The hysteresis
for the WARN output depends on the value of ΔT
ΔT
teresis is 5°C. If ΔT
sis is 10°C. MAX6507 and MAX6508 have pin-selectable
hysteresis of 2°C or 10°C for both OVER and OK out-
puts (Table 2).
The MAX6505–MAX6508 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 MAX6505–
MAX6508 package and the device being monitored. In
_______________Detailed Description
AW
OVER
= -10°C and T
is 5°C or 10°C (set by S0 and S1), WARN hys-
and T
OVER
. Table 4 shows the hex codes to deter-
UNDER
Applications Information
UNDER
_______________________________________________________________________________________
OVER
AW
OVER
. The first hex code indicates the
Hysteresis Selection
is 20°C or 30°C, WARN hystere-
). For example, a part with T
) and the second indicates the
Thermal Considerations
Dual Trip SOT Temperature Switches
OVER
= +75°C will have the part
and T
WARN
OVER
AW
UNDER
). When the die
) is pin selec-
and T
) and two
UNDER
ALARM
AW
UN-
. If
)
.
some applications, the SOT23 packages may be small
enough to fit underneath a socketed microprocessor
(µP), allowing the device to monitor the µP’s tempera-
ture directly. Use the monitor’s output to reset the µP,
assert an interrupt, or trigger an external alarm.
Accurate temperature monitoring depends on the ther-
mal resistance between the device being monitored
and the MAX6505–MAX6508 die.
The rise in die temperature due to self-heating is given
by the following formula:
where P
MAX6505–MAX6508, and θ
resistance. The typical thermal resistance is 115°C/W for
the SOT23 package. To limit the effects of self-heating,
minimize the output currents. For example, if the
MAX6505 sinks 5mA, the output voltage is guaranteed to
be less than 0.5V. Therefore, an additional 2.5mW of
Table 1. MAX6505/MAX6506 ΔT
Selection Table
Figure 1. Temperature Response—MAX6505UTP065 Outputs,
Δ T
AW
GND
GND
= 10°C, and WARN Hysteresis ≈ 5°C
V
V
S1
CC
CC
ALARM
CONTROL PINS
WARN
65°C
55°C
DISSIPATION
ΔT
J
= P
GND
GND
V
V
S0
CC
CC
is the power dissipated by the
DISSIPATION
JA
is the package’s thermal
T
AW
✕
DESCRIPTION
θ
=T
HYSTERESIS ≈ 2°C
HYSTERESIS ≈ 5°C
JA
ALARM
AW
(°C)
10
20
30
5
– T
WARN
5