LT3081
1
3081fc
For more information
Typical applicaTion
FeaTures
DescripTion
1.5A Single Resistor
Rugged Linear Regulator
with Monitors
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.
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
