LT3085

1

3085fb

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Adjustable 500mA Single

Resistor Low Dropout

Regulator

can be paralleled to increase output current or spread

heat on surface mounted boards. Designed as a precision

current source and voltage follower, this new regulator

finds use in many applications requiring high current,

adjustability to zero, and no heat sink. The device also

brings out the collector of the pass transistor to allow

low dropout operation—down to 275mV—when used

with a second supply.

A key feature of the LT3085 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 LT3085 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 LT3085 is offered in the 8-lead

MSOP and a low profile (0.75mm) 6-lead 2mm × 3mm

DFN package (both with an Exposed Pad for better thermal

characteristics).

Variable Output Voltage 500mA Supply

Heat Spreading

Protected

+

–

LT3085

IN

1.2V TO 36V

OUT

3085 TA01a

SET

1μF

2.2μF

SET PIN CURRENT DISTRIBUTION (μA)

10.20

3085 TA01b

9.90

10.00

10.10

9.80

N = 1676

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.