LT3080-1 Datasheet, PDF (1/24 Pages) Linear Technology – Parallelable 1.1A Adjustable Single Resistor Low Dropout Regulator

FEATURES
n _{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: 40μVRMS (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}
APPLICATIONS
n _{High Current All Surface Mount Supply}
n _{High Efficiency Linear Regulator}
n _{Post Regulator for Switching Supplies}
n _{Low Parts Count Variable Voltage Supply}
n _{Low Output Voltage Power Supplies}
LT3080-1
Parallelable 1.1A
Adjustable Single Resistor
Low Dropout Regulator
DESCRIPTION
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.
The LT3080-1 is capable of supplying a wide output volt-
age 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.
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Paralleling Regulators
V_IN
4.8V TO 28V
IN
V_CONTROL
IN
V_CONTROL
1μF
LT3080-1
+
–
SET
LT3080-1
25mΩ _OUT*
+
–
SET
165k
25mΩ
OUT*
30801 TA01
V_OUT
3.3V
2.2A
10μF
*OUTPUTS CAN BE
DIRECTLY MOUNTED
TO POWER PLANE
Offset Voltage Distribution
N = 13250
–2
–1
0
1
2
V_OS DISTRIBUTION (mV) _{30801 TA01b}
30801fa
1