LT3080
Adjustable1.1A Single
Resistor Low Dropout
Regulator
FEATURES
DESCRIPTION
TheLT®3080isa1.1Alowdropoutlinearregulatorthatcan
be paralleled to increase output current or spread heat in
surface mounted boards. Architected as a precision cur-
rent source and voltage follower allows this new regulator
to be used in many applications requiring high current,
adjustability to zero, and no heat sink. Also the device
brings out the collector of the pass transistor to allow low
dropout operation —down to 350 millivolts— when used
with multiple supplies.
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Outputs May be Paralleled for Higher Current and
Heat Spreading
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Output Current: 1.1A
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Single Resistor Programs Output Voltage
1% Initial Accuracy of SET Pin Current
Output Adjustable to 0V
Low Output Noise: 40μV
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(10Hz to 100kHz)
RMS
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Wide Input Voltage Range: 1.2V to 36V
Low Dropout Voltage: 350mV (Except SOT-223
Package)
A key feature of the LT3080 is the capability to supply a
wide output voltage range. By using a reference current
throughasingleresistor,theoutputvoltageisprogrammed
to any level between zero and 36V. The LT3080 is stable
with 2.2μF of capacitance on the output, and the IC uses
small ceramic capacitors that do not require additional
ESR as is common with other regulators.
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<1mV Load Regulation
<0.001%/V Line Regulation
Minimum Load Current: 0.5mA
Stable with 2.2μF Minimum Ceramic Output Capacitor
Current Limit with Foldback and Overtemperature
Protected
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Available in 8-Lead MSOP, 3mm × 3mm DFN,
5-Lead DD-Pak, TO-220 and 3-Lead SOT-223
Internal protection circuitry includes current limiting and
thermal limiting. The LT3080 regulator is offered in the
8-lead MSOP (with an exposed pad for better thermal
characteristics), a 3mm × 3mm DFN, 5-lead DD-Pak,
TO-220 and a simple-to-use 3-lead SOT-223 version.
APPLICATIONS
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High Current All Surface Mount Supply
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High Efficiency Linear Regulator
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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Post Regulator for Switching Supplies
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Low Parts Count Variable Voltage Supply
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Low Output Voltage Power Supplies
Set Pin Current Distribution
TYPICAL APPLICATION
Variable Output Voltage 1.1A Supply
N = 13792
IN
LT3080
V
IN
1.2V TO 36V
V
CONTROL
+
–
1μF
OUT
V
OUT
SET
2.2μF
R
V
SET
= R
• 10μA
SET
OUT
10.00
SET PIN CURRENT DISTRIBUTION (μA)
9.80
9.90
10.10
10.20
3080 TA01a
3080 G02
3080fb
1