LT3083
Adjustable 3A
Single Resistor Low
Dropout Regulator
DESCRIPTION
FEATURES
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: 40µV
RMS (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
APPLICATIONS
n
n
n
n
n
High Current All Surface Mount Supply
High Efficiency Linear Regulator
Post Regulator for Switching Supplies
Low Parts Count Variable Voltage Supply
Low Output Voltage Power Supplies
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 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 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 characteristics), 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.
TYPICAL APPLICATION
Set Pin Current Distribution
1.5V to 0.9V at 3A Supply (Using 3.3V VCONTROL)
VCONTROL
3.3V
N = 1052
4.7µF
VCONTROL
VIN
1.5V
IN
10µF
LT3083
OUT
10µF
SET
3083 TA01a
RSET
18.2k
1%
0.1µF
*RMIN
909Ω
VOUT = 0.9V
IMAX = 3A
*OPTIONAL FOR
MINIMUM 1mA LOAD
REQUIREMENT
49
49.5
50
50.5
SET PIN CURRENT DISTRIBUTION (µA)
51
3083 TA01b
3083fa
1
