LT3083

1

3083f

TYPICAL APPLICATION

DESCRIPTION

Adjustable 3A

Single Resistor Low

Dropout Regulator

be paralleled to increase output current or spread heat on

surface mounted boards. Architected 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 opera-

tion—down to 310mV—when used with multiple supplies.

A key feature of the LT3083 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 23V (DD-PAK and TO-220

packages). The LT3083 is stable with 10μF of capacitance

on the output, and the IC is stable with small ceramic ca-

pacitors that do not require additional ESR as is common

with other regulators.

Internal protection circuitry includes current limiting and

thermal limiting. The LT3083 is offered in the 16-lead

TSSOP (with an exposed pad for better thermal character-

istics), 12-lead 4mm × 4mm DFN (also with an exposed

pad), 5-lead TO-220, and 5-lead surface mount DD-PAK

packages.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

FEATURES

APPLICATIONS

Heat Spreading

(DD-Pak and TO-220 Packages)

Protection

DFN, 5-Lead TO-220 and 5-Lead Surface Mount

DD-PAK Packages

Set Pin Current Distribution

49

51

3083 TA01b

49.5

50

50.5

SET PIN CURRENT DISTRIBUTION (μA)

N = 1052

3083 TA01a

OUT

IN

LT3083

SET

909Ω

*

10μF

10μF

1.5V

4.7μF

3.3V

18.2k

1%

0.1μF

*OPTIONAL FOR

MINIMUM 1mA LOAD

REQUIREMENT