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What is LT3080?

This electronic component, produced by the manufacturer "Linear Technology", performs the same function as "Adjustable1.1A Single Resistor Low Dropout Regulator".


LT3080 Datasheet PDF - Linear Technology

Part Number LT3080
Description Adjustable1.1A Single Resistor Low Dropout Regulator
Manufacturers Linear Technology 
Logo Linear Technology Logo 


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LT3080
Adjustable1.1A Single
Resistor Low Dropout
Regulator
FEATURES
n Outputs May be Paralleled for Higher Current and
Heat Spreading
n Output Current: 1.1A
n Single Resistor Programs Output Voltage
n 1% Initial Accuracy of SET Pin Current
n Output Adjustable to 0V
n Low Output Noise: 40μVRMS (10Hz to 100kHz)
n Wide Input Voltage Range: 1.2V to 36V
n Low Dropout Voltage: 350mV (Except SOT-223
Package)
n <1mV Load Regulation
n <0.001%/V Line Regulation
n Minimum Load Current: 0.5mA
n Stable with 2.2μF Minimum Ceramic Output Capacitor
n Current Limit with Foldback and Overtemperature
Protected
n Available in 8-Lead MSOP, 3mm × 3mm DFN,
5-Lead DD-Pak, TO-220 and 3-Lead SOT-223
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
DESCRIPTION
The LT®3080 is a 1.1A low dropout linear regulator that can
be paralleled to increase output current or spread heat in
surface mounted boards. Architected as a precision cur-
rent source and voltage follower allows this new regulator
to be used in many applications requiring high current,
adjustability to zero, and no heat sink. Also the device
brings out the collector of the pass transistor to allow low
dropout operation —down to 350 millivolts— when used
with multiple supplies.
A key feature of the LT3080 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 36V. The LT3080 is stable
with 2.2μF of capacitance on the output, and the IC uses
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 LT3080 regulator is offered in the
8-lead MSOP (with an exposed pad for better thermal
characteristics), a 3mm × 3mm DFN, 5-lead DD-Pak,
TO-220 and a simple-to-use 3-lead SOT-223 version.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and VLDO
and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
Variable Output Voltage 1.1A Supply
VIN
1.2V TO 36V
IN
VCONTROL
1μF
LT3080
+
OUT
SET
RSET
VOUT = RSET • 10μA
3080 TA01a
VOUT
2.2μF
www.DataSheet.in
Set Pin Current Distribution
N = 13792
9.80 9.90 10.00 10.10 10.20
SET PIN CURRENT DISTRIBUTION (μA)
3080 G02
3080fb
1

line_dark_gray
LT3080 equivalent
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
(Minimum IN Voltage)
400
350
ILOAD = 1.1A
300
250
200 ILOAD = 500mA
150
100 ILOAD = 100mA
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3080 G10
Dropout Voltage (Minimum
VCONTROL Pin Voltage)
1.6
TJ = –50°C
1.4
1.2
TJ = 125°C
1.0
TJ = 25°C
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
3080 G11
LT3080
Dropout Voltage (Minimum
VCONTROL Pin Voltage)
1.6
1.4 ILOAD = 1.1A
1.2
1.0 ILOAD = 1mA
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3080 G12
Current Limit
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2 VIN = 7V
VOUT = 0V
0
–50 –25 0
25 50 75 100 125 150
TEMPERATURE (°C)
3080 G13
Load Transient Response
150
100
50
0
–50
–100
1.2
0.9
VIN = VCONTROL = 3V
VOUT = 1.5V
0.6 COUT = 10μF CERAMIC
CSET = 0.1μF
0.3
0
0 5 10 15 20 25 30 35 40 45 50
TIME (μs)
3080 G16
www.DataSheet.in
Current Limit
1.6
TJ = 25°C
1.4
SOT-223, DD-PAK
1.2 AND TO-220
1.0
0.8
0.6
MSOP
0.4 AND
DFN
0.2
0
0 6 12 18 24 30 36*
INPUT-TO-OUTPUT DIFFERENTIAL (V)
*SEE NOTE 9 IN ELECTRICAL
CHARACTERISTICS TABLE
3080 G14
Line Transient Response
75
50
25
0
–25
–50 VOUT = 1.5V
ILOAD = 10mA
6 COUT = 2.2μF
CERAMIC
5 CSET = 0.1μF
4 CERAMIC
3
2
0 10 20 30 40 50 60 70 80 90 100
TIME (μs)
3080 G17
Load Transient Response
75 VOUT = 1.5V
50 CSET = 0.1μF
25 VIN = VCONTROL = 3V
0
–25 COUT = 10μF CERAMIC
–50 COUT = 2.2μF CERAMIC
400
300
200
100
0
0 5 10 15 20 25 30 35 40 45 50
TIME (μs)
3080 G15
Turn-On Response
5
4
3
2
1 RSET = 100k
0
CSET = 0
RLOAD = 1Ω
2.0 COUT = 2.2μF CERAMIC
1.5
1.0
0.5
0
0 1 2 3 4 5 6 7 8 9 10
TIME (μs)
3080 G27
3080fb
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LT3080 electronic component.


Information Total 26 Pages
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