E-, I-Grades ....................................... –40°C to 125°C
H-Grade ............................................. –40°C to 150°C
MP-Grade .......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE, R, T7 Packages Only ................................... 300°C
pin conFiguraTion
TOP VIEW
TOP VIEW
OUT
OUT
OUT
OUT
I
LIM
SET
1
2
3
4
5
6
13
OUT
12 IN
11 IN
10 IN
9 IN
8 TEMP
7 I
MON
OUT
OUT
OUT
OUT
OUT
I
LIM
SET
OUT
1
2
3
4
5
6
7
8
17
OUT
16 OUT
15 IN
14 IN
13 IN
12 IN
11 TEMP
10 I
MON
9
OUT
DF PACKAGE
12-LEAD (4mm
×
4mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 32°C/W,
θ
JC
= 4°C/W
EXPOSED PAD (PIN 13) IS OUT, MUST BE SOLDERED TO PCB
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 29°C/W,
θ
JC
= 8°C/W
EXPOSED PAD (PIN 17) IS OUT, MUST BE SOLDERED TO PCB
FRONT VIEW
7
6
5
4
3
2
1
NC
IN
TEMP
OUT
I
MON
SET
I
LIM
FRONT VIEW
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
T
JMAX
= 150°C,
θ
JA
= 40°C/W,
θ
JC
= 3°C/W
NC
IN
TEMP
OUT
I
MON
SET
I
LIM
TAB IS
OUT
TAB IS
OUT
R PACKAGE
7-LEAD PLASTIC DD
T
JMAX
= 125°C,
θ
JA
= 15°C/W,
θ
JC
= 3°C/W
2
3081fc
For more information
www.linear.com/LT3081
LT3081
orDer inForMaTion
LEAD FREE FINISH
LT3081EDF#PBF
LT3081IDF#PBF
LT3081EFE#PBF
LT3081IFE#PBF
LT3081HFE#PBF
LT3081MPFE#PBF
LT3081ER#PBF
LT3081IR#PBF
LT3081ET7#PBF
LT3081IT7#PBF
LT3081HT7#PBF
LT3081MPT7#PBF
TAPE AND REEL
LT3081EDF#TRPBF
LT3081IDF#TRPBF
LT3081EFE#TRPBF
LT3081IFE#TRPBF
LT3081HFE#TRPBF
LT3081MPFE#TRPBF
LT3081ER#TRPBF
LT3081IR#TRPBF
NA
NA
NA
NA
PART MARKING*
3081
3081
3081FE
3081FE
3081FE
3081FE
LT3081R
LT3081R
LT3081T7
LT3081T7
LT3081T7
LT3081T7
PACKAGE DESCRIPTION
12-Lead (4mm
×
4mm) Plastic DFN
12-Lead (4mm
×
4mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
7-Lead Plastic DD-Pak
7-Lead Plastic DD-Pak
7-Lead Plastic TO-220
7-Lead Plastic TO-220
7-Lead Plastic TO-220
7-Lead Plastic TO-220
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard 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
PARAMETER
SET Pin Current
Offset Voltage
(V
OUT
– V
SET
)
I
SET
Load Regulation
V
OS
Load Regulation
(Note 7)
Line Regulation
Minimum Load Current (Note 3)
Dropout Voltage (Note 4)
Internal Current Limit
I
LIM
Programming Ratio
I
LIM
Minimum Output Current Resistance
I
MON
Full-Scale Output Current
I
MON
Scale Factor
I
MON
Operating Range
∆I
LOAD
= 5mA to 1.5A
∆I
SET
∆V
OS
I
SET
V
OS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
CONDITIONS
V
IN
= 2V, I
LOAD
= 5mA
2V ≤ V
IN
≤ 36V, 5mA ≤ I
LOAD
≤ 1.5A
V
IN
= 2V, I
LOAD
= 5mA
V
IN
= 2V, I
LOAD
= 5mA
∆I
LOAD
= 5mA to 1.5A
DF, FE Packages
R, T7 Packages
∆V
IN
= 2V to 36V, I
LOAD
= 5mA
∆V
IN
= 2V to 36V, I
LOAD
= 5mA
2V ≤ V
IN
≤ 36V
I
LOAD
= 100mA
I
LOAD
= 1.5A
V
IN
= 5V, V
SET
= 0V, V
OUT
= –0.1V
l
l
l
l
l
l
l
l
MIN
49.5
48.75
–1.5
–3.5
TYP
50
50
0
0
–0.1
–0.5
–1.5
1.5
0.001
1.1
1.21
1.23
MAX
50.5
51.25
1.5
3.5
–3
–4
UNITS
µA
µA
mV
mV
nA
mV
mV
nA/V
mV/V
5
1.5
500
330
V
OUT
+ 0.4V
mA
V
V
A
mA/kΩ
Ω
µA
µA/A
V
1.5
300
290
2
360
450
300
200
I
LOAD
= 1.5A
100mA ≤ I
LOAD
≤ 1.5A
l
V
OUT
– 40V
3081fc
For more information
www.linear.com/LT3081
3
LT3081
elecTrical characTerisTics
PARAMETER
TEMP Output Current (Note 9)
TEMP Output Current Absolute Error (Note 9)
Reference Current RMS Output Noise (Note 5)
Error Amplifier RMS Output Noise (Note 5)
Ripple Rejection
V
RIPPLE
= 0.5V
P-P
, I
LOAD
= 0.1A, C
SET
= 0.1µF,
C
OUT
=10µF, V
IN
= V
OUT(NOMINAL)
+ 3V
Thermal Regulation, I
SET
T
J
> 5°C
0°C <T
J
≤ 125°C
125°C <T
J
≤ 150°C
10Hz ≤ f ≤ 100kHz
I
LOAD
= 1.5A, 10Hz ≤ f ≤ 100kHz, C
OUT
=10µF,
C
SET
= 0.1µF
f = 120Hz
f = 10kHz
f = 1MHz
10ms Pulse
75
–10
–15
5.7
27
90
75
20
0.003
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
CONDITIONS
MIN
TYP
1
10
15
MAX
UNITS
µA/°C
µA
µA
nA
RMS
µV
RMS
dB
dB
dB
%/W
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:
Unless otherwise specified, all voltages are with respect to V
OUT
.
The LT3081 is tested and specified under pulse load conditions such
that T
J
≈ T
A
. The LT3081E is tested at T
A
= 25°C and performance is
guaranteed from 0°C to 125°C. Performance of the LT3081E over the
full –40°C and 125°C operating temperature range is assured by design,
characterization, and correlation with statistical process controls. The
LT3081I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3081MP is 100% tested and guaranteed
over the –55°C to 150°C operating junction temperature range. The
LT3081H is tested at 150°C operating junction temperature. High junction
temperatures degrade operating lifetimes. Operating lifetime is degraded at
junction temperatures greater than 125°C.
Note 3:
Minimum load current is equivalent to the quiescent current of
the part. Since all quiescent and drive current is delivered to the output
of the part, the minimum load current is the minimum current required to
maintain regulation.
Note 4:
For the LT3081, dropout is specified as the minimum input-to-
output voltage differential required supplying a given output current.
Note 5:
Adding a small capacitor across the reference current resistor
lowers output noise. Adding this capacitor bypasses the resistor shot
noise and reference current noise; output noise is then equal to error
amplifier noise (see Applications Information section).
Note 6:
Diodes with series 400Ω resistors clamp the SET pin to the
OUT pin. These diodes and resistors only carry current under transient
overloads.
Note 7:
Load regulation is Kelvin sensed at the package.
Note 8:
This IC includes overtemperature protection that protects the
device during momentary overload conditions. Junction temperature
exceeds the maximum operating junction temperature when
overtemperature protection is active. Continuous operation above the
specified maximum operating junction temperature may impair device
reliability.
Note 9:
The TEMP pin output current represents the average die junction
temperature. Due to power dissipation and thermal gradients across the
die, the TEMP pin output current measurement does not guarantee that
absolute maximum junction temperature is not exceeded.
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