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LT3081IR#PBF

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LT3081
1
3081fc
For more information www.linear.com/LT3081
Typical applicaTion
FeaTures DescripTion
1.5A Single Resistor
Rugged Linear Regulator
with Monitors
The LT
®
3081 is a 1.5A low dropout linear regulator de-
signed for rugged industrial applications. Key features of
the IC are the extended safe operating area (SOA), output
current monitor, temperature monitor and programmable
current limit. The LT3081 can be paralleled for higher
output current or heat spreading. The device withstands
reverse input and reverse output-to-input voltages without
reverse current flow.
The LT3081’s precision 50µA reference current source
allows a single resistor to program output voltage to
any level between zero and 34.5V. The current reference
architecture makes load regulation independent of output
voltage. The LT3081 is stable with or without input and
output capacitors.
The output current monitor (I
OUT
/5000) and die junction
temperature output (1µA/°C) provide system monitoring
and debug capability. In addition, a single resistor pro-
grams current limit.
Internal protection circuitry includes reverse-battery and
reverse-current protection, current limiting and thermal
limiting. The LT3081 is offered in the 16-lead TSSOP (with
exposed pad for improved thermal performance), 7-lead
TO-220, 7-lead DD-Pak, and an 12-lead 4mm × 4mm DFN.
Wide Safe Operating Area Supply
applicaTions
n
Extended Safe Operating Area
n
Maximum Output Current: 1.5A
n
Stable with or without Input/Output Capacitors
n
Wide Input Voltage Range: 1.2V to 36V
n
Single Resistor Sets Output Voltage
n
Output Current Monitor: I
MON
= I
OUT
/5000
n
Junction Temperature Monitor: 1µA/°C
n
Output Adjustable to 0V
n
50µA SET Pin Current: 1% Initial Accuracy
n
Output Voltage Noise: 27µV
RMS
n
Parallel Multiple Devices for Higher Current or
Heat Spreading
n
Programmable Current Limit
n
Reverse-Battery and Reverse-Current Protection
n
<1mV Load Regulation Typical Independent of V
OUT
n
<0.001%/V Line Regulation Typical
n
Available in Thermally-Enhanced 12-Lead 4mm × 4mm
DFN and 16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead
TO-220
n
All Surface Mount Power Supply
n
Rugged Industrial Power Supply
n
Post Regulator for Switching Supplies
n
Low Output Voltage Supply
n
Intrinsic Safety Applications
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.
TEMPERATURE (°C)
–50
49.5
SET PIN CURRENT (µA)
49.6
49.8
49.9
50.0
50.5
50.2
0
50
75
3081 TA01b
49.7
50.3
50.4
50.1
–25 25
100
125
150
I
L
= 5mA
SET Pin Current
3081 TA01a
IN
1k
4.53k
10µF*
*OPTIONAL
I
MON
I
LIM
OUT
+
–
LT3081
I
LOAD
/5000
I
OUT
1.5V
1A
V
IN
300Ω*
1k
1µA/°C
SET
30.1k
TEMP
50µA
LT3081
2
3081fc
For more information www.linear.com/LT3081
absoluTe MaxiMuM raTings
IN Pin to OUT Pin Differential Voltage .....................±40V
SET Pin Current (Note 6) .....................................±25mA
SET Pin Voltage (Relative to OUT, Note 6) .............. ±10V
TEMP Pin Voltage (Relative to OUT) .................1V, –40V
I
LIM
Pin Voltage (Relative to OUT) .........................±0.2V
I
MON
Pin Voltage (Relative to OUT) ...................1V, –40V
Output Short-Circuit Duration .......................... Indefinite
(Note 1) All Voltages Relative to V
OUT
.
TOP VIEW
13
OUT
DF PACKAGE
12-LEAD (4mm × 4mm) PLASTIC DFN
12
11
8
9
10
4
5
3
2
1
IN
IN
IN
IN
TEMP
I
MON
OUT
OUT
OUT
OUT
I
LIM
SET
6
7
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
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
OUT
OUT
OUT
OUT
OUT
I
LIM
SET
OUT
OUT
IN
IN
IN
IN
TEMP
I
MON
OUT
17
OUT
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
R PACKAGE
7-LEAD PLASTIC DD
FRONT VIEW
TAB IS
OUT
NC
IN
TEMP
OUT
I
MON
SET
I
LIM
7
6
5
4
3
2
1
T
JMAX
= 125°C, θ
JA
= 15°C/W, θ
JC
= 3°C/W
T7 PACKAGE
7-LEAD PLASTIC TO-220
TAB IS
OUT
NC
IN
TEMP
OUT
I
MON
SET
I
LIM
FRONT VIEW
7
6
5
4
3
2
1
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W
pin conFiguraTion
Operating Junction Temperature Range (Note 2)
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
LT3081
3
3081fc
For more information www.linear.com/LT3081
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. (Note 2)
elecTrical characTerisTics
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3081EDF#PBF LT3081EDF#TRPBF 3081
12-Lead (4mm × 4mm) Plastic DFN
–40°C to 125°C
LT3081IDF#PBF LT3081IDF#TRPBF 3081
12-Lead (4mm × 4mm) Plastic DFN
–40°C to 125°C
LT3081EFE#PBF LT3081EFE#TRPBF 3081FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3081IFE#PBF LT3081IFE#TRPBF 3081FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3081HFE#PBF LT3081HFE#TRPBF 3081FE 16-Lead Plastic TSSOP –40°C to 150°C
LT3081MPFE#PBF LT3081MPFE#TRPBF 3081FE 16-Lead Plastic TSSOP –55°C to 150°C
LT3081ER#PBF LT3081ER#TRPBF LT3081R 7-Lead Plastic DD-Pak –40°C to 125°C
LT3081IR#PBF LT3081IR#TRPBF LT3081R 7-Lead Plastic DD-Pak –40°C to 125°C
LT3081ET7#PBF NA LT3081T7 7-Lead Plastic TO-220 –40°C to 125°C
LT3081IT7#PBF NA LT3081T7 7-Lead Plastic TO-220 –40°C to 125°C
LT3081HT7#PBF NA LT3081T7 7-Lead Plastic TO-220 –40°C to 150°C
LT3081MPT7#PBF NA LT3081T7 7-Lead Plastic TO-220 –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/
PARAMETER CONDITIONS MIN TYP MAX UNITS
SET Pin Current I
SET
V
IN
= 2V, I
LOAD
= 5mA
2V ≤ V
IN
≤ 36V, 5mA ≤ I
LOAD
≤ 1.5A
l
49.5
48.75
50
50
50.5
51.25
µA
µA
Offset V
oltage V
OS
(V
OUT
– V
SET
)
V
IN
= 2V, I
LOAD
= 5mA
V
IN
= 2V, I
LOAD
= 5mA
l
–1.5
–3.5
0
0
1.5
3.5
mV
mV
I
SET
Load Regulation ∆I
LOAD
= 5mA to 1.5A –0.1 nA
V
OS
Load Regulation ∆I
LOAD
= 5mA to 1.5A
(Note 7)
DF, FE Packages
l
–0.5 –3 mV
R, T7 Packages
l
–1.5 –4 mV
Line Regulation ∆I
SET
∆V
OS
∆V
IN
= 2V to 36V, I
LOAD
= 5mA
∆V
IN
= 2V to 36V, I
LOAD
= 5mA
1.5
0.001
nA/V
mV/V
Minimum Load Current (Note 3) 2V ≤ V
IN
≤ 36V
l
1.1 5 mA
Dropout Voltage (Note 4) I
LOAD
= 100mA
I
LOAD
= 1.5A
l
1.21
1.23
1.5
V
V
Internal Current Limit V
IN
= 5V, V
SET
= 0V, V
OUT
= –0.1V
l
1.5 2 A
I
LIM
Programming Ratio
l
300 360 500 mA/kΩ
I
LIM
Minimum Output Current Resistance 450 Ω
I
MON
Full-Scale Output Current I
LOAD
= 1.5A 290 300 330 µA
I
MON
Scale Factor 100mA ≤ I
LOAD
≤ 1.5A 200 µA/A
I
MON
Operating Range
l
V
OUT
– 40V V
OUT
+ 0.4V V
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LT3081IR#PBF

Mfr. #:
Buy LT3081IR#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LDO Voltage Regulators 1.5A Single Resistor Programmable Rugged Linear Regulator
Lifecycle:
New from this manufacturer.
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