LT3083
Adjustable 3A
Single Resistor Low
Dropout Regulator
FEATURES DESCRIPTION
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Outputs May be Paralleled for Higher Current and The LT 3083 is a 3A low dropout linear regulator that can
Heat Spreading
be paralleled to increase output current or spread heat on
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Output Current: 3A
surface mounted boards. Architected as a precision current
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Single Resistor Programs Output Voltage
source and voltage follower, this new regulator finds use
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50A Set Pin Current: 1% Initial Accuracy
in many applications requiring high current, adjustability
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Output Adjustable to 0V
to zero, and no heat sink. The device also brings out the
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Low Output Noise: 40V (10Hz to 100kHz)
collector of the pass transistor to allow low dropout opera-
RMS
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Wide Input Voltage Range: 1.2V to 23V
tiondown to 310mVwhen used with multiple supplies.
(DD-Pak and TO-220 Packages)
A key feature of the LT3083 is the capability to supply a
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Low Dropout Voltage: 310mV
wide output voltage range. By using a reference current
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<1mV Load Regulation
through a single resistor, the output voltage is programmed
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<0.001%/V Line Regulation
to any level between zero and 23V (DD-PAK and TO-220
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Minimum Load Current: 1mA
packages). The LT3083 is stable with 10F of capacitance
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Stable with Minimum 10F Ceramic Capacitor
on the output, and the IC is stable with small ceramic ca-
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Current Limit with Foldback and Overtemperature
pacitors that do not require additional ESR as is common
Protection
with other regulators.
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Available in 16-Lead TSSOP, 12-Lead 4mm 4mm
DFN, 5-Lead TO-220 and 5-Lead Surface Mount
Internal protection circuitry includes current limiting and
DD-PAK Packages
thermal limiting. The LT3083 is offered in the 16-lead
TSSOP (with an exposed pad for better thermal character-
APPLICATIONS
istics), 12-lead 4mm 4mm DFN (also with an exposed
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High Current All Surface Mount Supply
pad), 5-lead TO-220, and 5-lead surface mount DD-PAK
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High Efficiency Linear Regulator
packages.
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Post Regulator for Switching Supplies
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
n Technology Corporation. All other trademarks are the property of their respective owners.
Low Parts Count Variable Voltage Supply
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Low Output Voltage Power Supplies
TYPICAL APPLICATION
Set Pin Current Distribution
1.5V to 0.9V at 3A Supply (Using 3.3V V )
CONTROL
N = 1052
V
CONTROL
3.3V
4.7F
V
CONTROL
V = 0.9V
LT3083
V OUT
IN
IN OUT
I = 3A
1.5V MAX
*
10F 10F
SET R
MIN
3083 TA01a 909
*OPTIONAL FOR
MINIMUM 1mA LOAD
REQUIREMENT
R
SET
0.1F
18.2k
1%
49 49.5 50 50.5 51
SET PIN CURRENT DISTRIBUTION (A)
3083 TA01b
3083fa
1LT3083
ABSOLUTE MAXIMUM RATINGS
(Note 1) All Voltages Relative to V
OUT
Output Short-Circuit Duration .......................... Indenfi ite
CONTROL Pin Voltage .............................................28V
Operating Junction Temperature Range (Notes 2, 10)
IN Pin Voltage (T5, Q Packages) ....................18V, 0.3V
E-, I-grades ........................................ 40C to 125C
No Overload or Short-Circuit .....................23V, 0.3V
MP-grade ........................................... 55C to 125C
IN Pin Voltage (DF, FE Packages) ..................... 8 V, 0. 3V
Storage Temperature Range .................. 65C to 150C
No Overload or Short-Circuit .....................14V, 0.3V
Lead Temperature (Soldering, 10 sec)
SET Pin Current (Note 7) .....................................25mA
T, Q, FE Packages Only .....................................300C
SET Pin Voltage (Relative to OUT) .......................... 10V
PIN CONFIGURATION
TOP VIEW
OUT 1 OUT
16
TOP VIEW
OUT 2 IN
15
1 12 IN
OUT
OUT 3 IN
14
2 IN
OUT 11
OUT 4 IN
13
3 IN
OUT 13 10 17
OUT OUT
4 OUT 5 IN
OUT 9 IN 12
OUT 5 8 V
CONTROL OUT 6 V
11
CONTROL
SET 6 7 V
CONTROL
SET 7 V
10
CONTROL
DF PACKAGE
OUT 8 OUT
9
12-LEAD (4mm 4mm) PLASTIC DFN
T = 125C, = 37C/W, = 8C/W FE PACKAGE
JMAX JA JC
EXPOSED PAD (PIN 13) IS OUT, MUST BE SOLDERED TO PCB 16-LEAD PLASTIC TSSOP
T = 125C, = 25C/W, = 8C/W
JMAX JA JC
EXPOSED PAD (PIN 17) IS OUT, MUST BE SOLDERED TO PCB
FRONT VIEW FRONT VIEW
5 IN
5 IN
4 V
4 V
CONTROL CONTROL
TAB IS
TAB IS
3 OUT 3
OUT
OUT
OUT
2 SET 2 SET
1 NC
1 NC
Q PACKAGE T PACKAGE
5-LEAD PLASTIC DD-PAK 5-LEAD PLASTIC TO-220
T = 125C, = 15C/W, = 3C/W T = 125C, = 40C/W, = 3C/W
JMAX JA JC
JMAX JA JC
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3083EDF#PBF LT3083EDF#TRPBF 3083 12-Lead (4mm 4mm) Plastic DFN 40C to 125C
LT3083EFE#PBF LT3083EFE#TRPBF 3083FE 16-Lead Plastic TSSOP 40C to 125C
LT3083EQ#PBF LT3083EQ#TRPBF LT3083Q 5-Lead Plastic DD-PAK 40C to 125C
LT3083ET#PBF LT3083ET#TRPBF LT3083T 5-Lead Plastic TO-220 40C to 125C
LT3083IDF#PBF LT3083IDF#TRPBF 3083 12-Lead (4mm 4mm) Plastic DFN 40C to 125C
LT3083IFE#PBF LT3083IFE#TRPBF 3083FE 16-Lead Plastic TSSOP 40C to 125C
3083fa
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