The LTC2996 provides an accurate, low power solution
for temperature monitoring in a compact 3mm × 3mm
DFN package.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Converts Remote or Internal Diode Temperature to
Analog Voltage
Adjustable Overtemperature and Undertemperature
Thresholds
Voltage Output Proportional to Temperature
±1°C Remote Temperature Accuracy
±2°C Internal Temperature Accuracy
Built-In Series Resistance Cancellation
Open Drain Alert Outputs
2.25V to 5.5V Supply Voltage
1.8V Reference Voltage Output
200μA Quiescent Current
10-Lead 3mm × 3mm DFN Package
applicaTions
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Temperature Monitoring and Measurement
System Thermal Control
Network Servers
Desktop and Notebook Computers
Environmental Monitoring
Typical applicaTion
Remote Temperature Monitor with Overtemperature
and Undertemperature Thresholds
2.25V TO 5.5V
0.1µF
1.8V
43k
VTH
36k
VTL
102k
V
PTAT
D
+
470pF
GND
D
–
V
PTAT
vs Remote
Diode Temperature
1.8
V
REF
V
CC
LTC2996
OT
OT
T > 70°C
TEMPERATURE
CONTROL
SYSTEM
V
PTAT
(V)
MMBT3904
1.6
UT
UT
T < –20°C
1.4
4mV/K
1.2
1.0
0.8
25 50 75 100 125 150
–50 –25 0
REMOTE DIODE TEMPERATURE (°C)
2996 TA01b
2996 TA01a
2996f
1
LTC2996
absoluTe MaxiMuM raTings
(Notes 1, 2)
pin conFiguraTion
V
CC
.............................................................. –0.3V to 6V
D
+
, D
–
, V
PTAT
, V
REF
............................. –0.3V to V
CC
+ 0.3V
OT, UT,
VTH, VTL ......................................... –0.3V to 6V
Operating Ambient Temperature Range
LTC2996C ................................................ 0°C to 70°C
LTC2996I .............................................–40°C to 85°C
LTC2996H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
TOP VIEW
VTH
VTL
D
+
1
2
3
4
5
11
10
OT
9
UT
8 V
REF
7 GND
6 V
CC
D
–
V
PTAT
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD PCB GROUND CONNECTION OPTIONAL
orDer inForMaTion
LEAD FREE FINISH
LTC2996CDD#PBF
LTC2996IDD#PBF
LTC2996HDD#PBF
TAPE AND REEL
LTC2996CDD#TRPBF
LTC2996IDD#TRPBF
LTC2996HDD#TRPBF
PART MARKING*
LFQX
LFQX
LFQX
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic QFN
10-Lead (3mm
×
3mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
10-Lead (3mm
×
3mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
SYMBOL
V
CC
UVLO
I
CC
V
REF
PARAMETER
Supply Voltage
Supply Undervoltage Lockout Threshold
Average Supply Current
Reference Voltage
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
l
MIN
2.25
1.7
l
l
TYP
1.9
200
MAX
5.5
2.1
300
1.803
1.805
1.808
±1.5
V
CC
– 100
–192
UNITS
V
V
µA
V
V
V
mV
mV
µA
2996f
V
CC
Falling
Temperature Measurement
LTC2996
LTC2996C
LTC2996I, LTC2996H
I
LOAD
= ±200μA, V
CC
= 3.3V
(Note 3)
l
l
l
l
1.797
1.795
1.790
V
CC
– 600
–8
1.8
1.8
1.8
V
CC
– 300
V
REF
Load Regulation
Diode Select Threshold
Remote Diode Sense Current
2
LTC2996
elecTrical characTerisTics
SYMBOL
T
CONV
K
T
T
INT
T
RMT
PARAMETER
Temperature Update Interval
V
PTAT
Slope
V
PTAT
Load Regulation
Internal Temperature Accuracy
Ideality Factor
η
= 1.004
I
LOAD
= ±200μA
LTC2996C, LTC2996I
LTC2996H
0°C to 85°C (Notes 4, 5)
–40°C to 0°C (Notes 4, 5)
85°C to 125°C (Notes 4, 5)
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
CC
= 3.3V, unless otherwise noted.
CONDITIONS
MIN
TYP
3.5
4
±1.5
±0.5
±0.5
±0.5
±0.25
±0.25
±0.25
0.15
0.01
l
MAX
5
UNITS
ms
mV/K
mV
°C
°C
°C
°C
°C
°C
°C
RMS
°C
RMS
/√Hz
±1
±2
±3
±1
±1.5
±1.5
Remote Temperature Error,
η
= 1.004
Temperature Noise
T
VCC
T
RS
T
OFF
∆T
HYST
I
IN
V
OH
V
OL
Temperature Error vs Supply
Series Resistance Cancellation Error
VTH, VTL Offset
OT, UT
Temperature Hysteresis
VTH, VTL, Input Current
High Level Output Voltage,
OT, UT
Low Level Output Voltage,
OT, UT
I = –0.5μA
I = 3mA
R
SERIES
= 100Ω
±0.5
±0.25
–3
2
–1
5
±1
1
10
±20
V
CC
– 1.2
0.4
°C/V
°C
°C
°C
nA
V
V
l
Temperature Monitoring
l
l
l
Digital Outputs
l
l
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3:
If voltage on pin D
+
exceeds the diode select threshold the
LTC2996 uses the internal diode sensor.
Note 4:
Remote diode temperature, not LTC2996 temperature.
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