FEATURES
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LT3081
1.5A Single Resistor
Rugged Linear Regulator
with Monitors
DESCRIPTION
The
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.
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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Extended Safe Operating Area
Maximum Output Current: 1.5A
Stable with or without Input/Output Capacitors
Wide Input Voltage Range: 1.2V to 36V
Single Resistor Sets Output Voltage
Output Current Monitor: I
MON
= I
OUT
/5000
Junction Temperature Monitor: 1µA/°C
Output Adjustable to 0V
50µA SET Pin Current: 1% Initial Accuracy
Output Voltage Noise: 27µV
RMS
Parallel Multiple Devices for Higher Current or
Heat Spreading
Programmable Current Limit
Reverse-Battery and Reverse-Current Protection
<1mV Load Regulation Typical Independent of V
OUT
<0.001%/V Line Regulation Typical
Available in Thermally-Enhanced 12-Lead 4mm
×
4mm DFN and 16-Lead TSSOP 7-Lead DD-Pak and
,
7-Lead TO-220
APPLICATIONS
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All Surface Mount Power Supply
Rugged Industrial Power Supply
Post Regulator for Switching Supplies
Low Output Voltage Supply
Intrinsic Safety Applications
TYPICAL APPLICATION
Wide Safe Operating Area Supply
V
IN
SET PIN CURRENT (µA)
LT3081
I
SET
50µA
IN
50.5
50.4
50.3
50.2
50.1
50.0
49.9
49.8
49.7
49.6
49.5
–50 –25
0
I
L
= 5mA
SET Pin Current
+
–
TEMP
R
TEMP
1k
SET I
MON
R
SET
30.1k
R
IMON
1k
I
LIM
OUT
C
OUT
*
10µF
*OPTIONAL
R
ILIM
6.04k
I
OUT
1.5V
R
LOAD
* 1.5A
5mA
MIN
3081 TA01a
25 50 75 100 125 150
TEMPERATURE (°C)
3081 TA01b
3081f
For more information
www.linear.com/LT3081
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LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
