LT3083EDF Datasheet, PDF (1/28 Pages) Linear Technology – Adjustable 3A Single Resistor Low Dropout Regulator

FEATURES
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
APPLICATIONS
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}
LT3083
Adjustable 3A
Single Resistor Low
Dropout Regulator
DESCRIPTION
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 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.
TYPICAL APPLICATION
1.5V to 0.9V at 3A Supply (Using 3.3V V_CONTROL)
V_CONTROL
3.3V
V_IN
1.5V
4.7µF
IN
10µF
V_CONTROL
LT3083 _OUT
SET
3083 TA01a
R_SET
18.2k
1%
10µF
0.1µF
*R_MIN
909Ω
V_OUT = 0.9V
I_MAX = 3A
*OPTIONAL FOR
MINIMUM 1mA LOAD
REQUIREMENT
Set Pin Current Distribution
N = 1052
49
49.5
50
50.5
51
SET PIN CURRENT DISTRIBUTION (µA)
3083 TA01b
3083fa
1