LT3083

1

Rev. B

For more information www.analog.com

Document Feedback

TYPICAL APPLICATION

DESCRIPTION

Adjustable 3A

Single Resistor Low

Dropout Regulator

The LT®3083 is a 3A low dropout linear regulator that can

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 operation—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 cur-

rent through a single resistor, the output voltage is pro-

grammed 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 capacitors 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 char-

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

exposed pad), 5-lead TO-220, and 5-lead surface mount

DD-PAK packages.

1.5V to 0.9V at 3A Supply (Using 3.3V VCONTROL)

FEATURES

APPLICATIONS

n

Outputs May be Paralleled for Higher Current and

Heat Spreading

n

Output Current: 3A

n

Single Resistor Programs Output Voltage

n

50µA Set Pin Current: 1% Initial Accuracy

n

Output Adjustable to 0V

n

Low Output Noise: 40µVRMS (10Hz to 100kHz)

n

Wide Input Voltage Range: 1.2V to 23V

(DD-Pak and TO-220 Packages)

n

Low Dropout Voltage: 310mV

n

<1mV Load Regulation

n

<0.001%/V Line Regulation

n

Minimum Load Current: 1mA

n

Stable with Minimum 10µF Ceramic Capacitor

n

Current Limit with Foldback and Overtemperature

Protection

n

Available in 16-Lead TSSOP, 12-Lead 4mm × 4mm

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

DD-PAK Packages

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

Set Pin Current Distribution

49

51

3083 TA01b

49.5

50

50.5

SET PIN CURRENT DISTRIBUTION (µA)

N = 1052

3083 TA01a

VCONTROL

OUT

IN

LT3083

SET

RMIN

909Ω

*

10µF

10µF

VOUT = 0.9V

IMAX = 3A

VIN

1.5V

4.7µF

VCONTROL

3.3V

RSET

18.2k

1%

0.1µF

*OPTIONAL FOR

MINIMUM 1mA LOAD

REQUIREMENT

All registered trademarks and trademarks are the property of their respective owners. .