LT3080-1
Parallelable 1.1A
Adjustable Single Resistor
Low Dropout Regulator
Description
Features
Internal Ballast Resistor Permits Direct
Connection to Power Plane for Higher Current
and Heat Spreading
n Output Current: 1.1A
n Single Resistor Programs Output Voltage
n 1% Initial Accuracy of SET Pin Current
n Output Adjustable to 0V
n Low Output Noise: 40µV
RMS (10Hz to 100kHz)
n Wide Input Voltage Range: 1.2V to 36V
n Low Dropout Voltage: 350mV
n <0.001%/ V Line Regulation
n Minimum Load Current: 0.5mA
n Stable with 2.2µF Minimum Ceramic Output Capacitor
n Current Limit with Foldback and Overtemperature
Protected
n Available in 8-Lead MSOP and 3mm × 3mm DFN
The LT®3080-1 is a 1.1A low dropout linear regulator that
incorporates an internal ballast resistor to allow direct
paralleling of devices without the need for PC board trace
resistors. The internal ballast resistor allows multiple devices to be paralleled directly on a surface mount board
for higher output current and power dissipation while
keeping board layout simple and easy. The device brings
out the collector of the pass transistor to allow low dropout
operation—down to 350mV—when used with multiple
input supplies.
Applications
Internal protection includes current limiting and thermal
limiting. The LT3080-1 regulator is offered in the 8-lead
MSOP (with an Exposed Pad for better thermal characteristics) and 3mm × 3mm DFN packages.
n
n
n
n
n
n
High Current All Surface Mount Supply
High Efficiency Linear Regulator
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Power Supplies
The LT3080-1 is capable of supplying a wide output voltage range. A reference current through a single resistor
programs the output voltage to any level between zero
and 36V. The LT3080-1 is stable with 2.2µF of ceramic
capacitance on the output, not requiring additional ESR
as is common with other regulators.
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.
Typical Application
Paralleling Regulators
IN
Offset Voltage Distribution
LT3080-1
N = 13250
VCONTROL
+
–
25mΩ
OUT*
25mΩ
OUT*
SET
IN
VIN
4.8V TO 28V
LT3080-1
VCONTROL
+
–
1µF
SET
VOUT
3.3V
2.2A
10µF
165k
30801 TA01
–2
*OUTPUTS CAN BE
DIRECTLY MOUNTED
TO POWER PLANE
0
–1
1
VOS DISTRIBUTION (mV)
2
30801 TA01b
30801fc
For more information www.linear.com/LT3080-1
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