LT3080

1

3080fb

Adjustable1.1A Single

Resistor Low Dropout

Regulator

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.

Heat Spreading

Package)

Protected

5-Lead DD-Pak, TO-220 and 3-Lead SOT-223

Variable Output Voltage 1.1A Supply

+

–

LT3080

IN

1.2V TO 36V

OUT

3080 TA01a

SET

1μF

2.2μF

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

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