LT3080
Adjustable1.1A Single
Resistor Low Dropout
Regulator
Fea T
Descrip T
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Outputs May be Paralleled for Higher Current and The LT 3080 is a 1.1A low dropout linear regulator that can
Heat Spreading be paralleled to increase output current or spread heat in
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Output Current: 1.1A surface mounted boards. Architected as a precision cur-
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Single Resistor Programs Output Voltage rent source and voltage follower allows this new regulator
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1% Initial Accuracy of SET Pin Current to be used in many applications requiring high current,
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Output Adjustable to 0V adjustability to zero, and no heat sink. Also the device
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Low Output Noise: 40V (10Hz to 100kHz) brings out the collector of the pass transistor to allow low
RMS
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Wide Input Voltage Range: 1.2V to 36V dropout operation down to 350 millivolts when used
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Low Dropout Voltage: 350mV (Except SOT-223 with multiple supplies.
Package)
A key feature of the LT3080 is the capability to supply a
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<1mV Load Regulation
wide output voltage range. By using a reference current
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<0.001%/V Line Regulation
through a single resistor, the output voltage is programmed
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Minimum Load Current: 0.5mA
to any level between zero and 36V. The LT3080 is stable
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Stable with 2.2F Minimum Ceramic Output Capacitor
with 2.2F of capacitance on the output, and the IC uses
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Current Limit with Foldback and Overtemperature
small ceramic capacitors that do not require additional
Protected
ESR as is common with other regulators.
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Available in 8-Lead MSOP, 3mm 3mm DFN,
Internal protection circuitry includes current limiting and
5-Lead DD-Pak, TO-220 and 3-Lead SOT-223
thermal limiting. The LT3080 regulator is offered in the
8-lead MSOP (with an exposed pad for better thermal
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characteristics), a 3mm 3mm DFN, 5-lead DD-Pak,
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High Current All Surface Mount Supply
TO-220 and a simple-to-use 3-lead SOT-223 version.
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High Efficiency Linear Regulator
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
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Post Regulator for Switching Supplies
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
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property of their respective owners.
Low Parts Count Variable Voltage Supply
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Low Output Voltage Power Supplies
Set Pin Current Distribution
Typical a T
Variable Output Voltage 1.1A Supply
N = 13792
IN LT3080
V
IN
1.2V TO 36V
V
CONTROL
+
1F
OUT
V
OUT
SET
2.2F
R
SET
V = R 10A
OUT SET
9.80 9.90 10.00 10.10 10.20
3080 TA01a
SET PIN CURRENT DISTRIBUTION (A)
3080 G02
3080fc
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uresLT3080
a Te Maxi Mu M r a T (Note 1)(All Voltages Relative to V )
OUT
V Pin Voltage ..................................... 40V, 0.3V Operating Junction Temperature Range (Notes 2, 10)
CONTROL
IN Pin Voltage ................................................ 40V, 0.3V E-, I-Grades ............................................ 40C to 125C
SET Pin Current (Note 7) .....................................10mA Storage Temperature Range: .................. 65C to 150C
SET Pin Voltage (Relative to OUT) .........................0.3V Lead Temperature (Soldering, 10 sec)
Output Short-Circuit Duration .......................... Indefinite MS8E, Q, T and ST Packages Only .................... 300C
p in c F T
TOP VIEW
FRONT VIEW
TOP VIEW
5 IN
OUT 1 8 IN
OUT 1 8 IN
4 V
CONTROL
OUT 2 7 IN
OUT 2 9 7 IN
9
TAB IS
OUT 3 OUT 6 NC 3 OUT
OUT 3 OUT 6 NC
OUT
SET 4 5 V
CONTROL
2 SET
SET 4 5 V
CONTROL
MS8E PACKAGE
1 NC
8-LEAD PLASTIC MSOP
Q PACKAGE
DD PACKAGE T = 125C, = 60C/W, = 10C/W
JMAX JA JC
5-LEAD PLASTIC DD-PAK
8-LEAD (3mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO PCB
T = 125C, = 64C/W, = 3C/W
JMAX JA JC T = 125C, = 30C/W, = 3C/W
JMAX JA JC
EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO PCB
FRONT VIEW
FRONT VIEW
3 IN*
5 IN
TAB IS
4 V
CONTROL
2 OUT
TAB IS
OUT
3
OUT
OUT
2 SET
1 SET
1 NC
ST PACKAGE
T PACKAGE
3-LEAD PLASTIC SOT-223
5-LEAD PLASTIC TO-220
*IN IS V AND IN TIED TOGETHER
CONTROL
T = 125C, = 40C/W, = 3C/W
JMAX JA JC
T = 125C, = 55C/W, = 15C/W
JMAX JA JC
3080fc
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