LT3080
1
3080fc
Adjustable1.1A Single
Resistor Low Dropout
Regulator
The LT
®
3080 is a 1.1A low dropout linear regulator that can
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.
A key feature of the LT3080 is the capability to supply a
wide output voltage range. By using a reference current
through a single resistor, the output voltage is programmed
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.
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.
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High Current All Surface Mount Supply
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High Efficiency Linear Regulator
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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
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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
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1% Initial Accuracy of SET Pin Current
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Output Adjustable to 0V
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Low Output Noise: 40µV
RMS
(10Hz to 100kHz)
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Wide Input Voltage Range: 1.2V to 36V
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Low Dropout Voltage: 350mV (Except SOT-223
Package)
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<1mV Load Regulation
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<0.001%/V Line Regulation
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Minimum Load Current: 0.5mA
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Stable with 2.2µF Minimum Ceramic Output Capacitor
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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
Variable Output Voltage 1.1A Supply
+
–
LT3080
IN
V
IN
1.2V TO 36V
V
CONTROL
OUT
3080 TA01a
SET
1µF
2.2µF
R
SET
V
OUT
= R
SET
• 10µA
V
OUT
Set Pin Current Distribution
SET PIN CURRENT DISTRIBUTION (µA)
10.20
3080 G02
9.90
10.00
10.10
9.80
N = 13792
Typical applicaTion
DescripTion
FeaTures
applicaTions
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.
