LRC LR1084T-2.5 Low dropout voltage: 1.3v typically at 5a, current limiting and thermal protection Datasheet

LESHAN RADIO COMPANY, LTD.
General Description
Features
The LR1084 is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 5A of
load current.
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The series features on-chip thermal limiting which provides protection against any combination of overload
and ambient temperatures that would create excessive
junction temperatures. It also includes a trimmed bandgap reference and a current limiting circuit.
The LR1084 is available in 1.5V, 1.8V, 2.5V, 2.85V,
3.3V and 5.0Vversions. The fixed versions integrate
the adjust resistors. It is also available in an adjustable
version which can set the output voltage with two
external resistors.
The LR1084 series is available in standard packages of
TO-263-2L, TO-263-3L, TO-220 and TO-252.
TO-263-3L
TO-263-2L
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Low Dropout Voltage: 1.3V Typically at 5A
Current Limiting and Thermal Protection
Output Current: 5A
Current Limit: 6.5A
Operating Junction Temperature Range: 0 to
125oC
Line Regulation: 0.015% (Typical)
Load Regulation: 0.2% (Typical)
Applications
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High Efficiency Linear Regulators
Battery Chargers
Post Regulation for Switching Supply
Microprocessor Supply
Desktop PCs, RISC and Embedded Processors'
Supply
TO-252
TO-220
Figure 1. Package Types of LR1084
LR1084-1/12
LESHAN RADIO COMPANY, LTD.
Pin Configuration
T Package
(TO-220)
D Package
(TO-252)
3
INPUT
2
OUTPUT
1
ADJ/GND
3
INPUT
2
OUTPUT
1
ADJ/GND
S Package
S Package
(TO-263-3L)
(TO-263-2L)
3
INPUT
3
2
OUTPUT
2
OUTPUT (TAB)
1
ADJ/GND
1
ADJ/GND
INPUT
Figure 2. Pin Configuration of LR1084 (Top View)
LR1084-2/12
LESHAN RADIO COMPANY, LTD.
Ordering Information
Package
Temperature Range
Part Number
Marking ID
Packing Type
LR1084D-ADJ
LR1084D-ADJ
Tube/Tape/Reel
TO-252
0 to 125 C
LR1084D-1.5
LR1084D-1.5
LR1084D-1.8
LR1084D-1.8
LR1084D-2.5
LR1084D-2.5
LR1084D-2.85
LR1084D-2.85
LR1084D-3.3
LR1084D-3.3
LR1084D-5.0
LR1084D-5.0
o
LR1084T-ADJ
LR1084T-ADJ
Tube
TO-220
0 to 125 C
LR1084T-1.5
LR1084T-1.5
LR1084T-1.8
LR1084T-1.8
LR1084T-2.5
LR1084T-2.5
LR1084T-2.85
LR1084T-2.85
LR1084T-3.3
LR1084T-3.3
LR1084T-5.0
LR1084T-5.0
o
LR1084S-ADJ
LR1084S-ADJ
TO-263-3L
Tube/Tape/Reel
0 to 125 C
LR1084S-1.5
LR1084S-1.5
LR1084S-1.8
LR1084S-1.8
LR1084S-2.5
LR1084S-2.5
LR1084S-2.85
LR1084S-2.85
LR1084S-3.3
LR1084S-3.3
LR1084S-5.0
LR1084S-5.0
LR1084S2-ADJ
LR1084S2-ADJ
Tube/Tape/Reel
TO-263-2L
0 to 125oC
LR1084S2-1.5
LR1084S2-1.5
LR1084S2-1.8
LR1084S2-1.8
LR1084S2-2.5
LR1084S2-2.5
LR1084S2-2.85
LR1084S2-2.85
LR1084S2-3.3
LR1084S2-3.3
LR1084S2-5.0
LR1084S2-5.0
Some of our products are available in Lead Free packages; If buyers need Lead Free product, please add -E1 after
the part number in your order. For example, LR358M is a standard tin-lead product, LR358M-E1 means a Lead
Free product.
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LR1084 X - Y
Circuit Type
Package
D: TO-252
T: TO-220
S: TO-263-3L
S2: TO-263-2L
ADJ: Adjustable Output
1.5: Fixed Output 1.5V
1.8: Fixed Output 1.8V
2.5: Fixed Output 2.5V
2.85: Fixed Output 2.85V
3.3: Fixed Output 3.3V
5.0: Fixed Output 5.0V
LR1084-3/12
LESHAN RADIO COMPANY, LTD.
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Max
Unit
150
oC
150
o
TLEAD
300
o
ESD
2000
V
Operating Junction Temperature Range
TJ
Storage Temperature Range
TS
Lead Temperature (Soldering, 10 sec.)
ESD (Human Body Model)
Min
-65
C
C
Note 1:Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those indicated under"Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum
Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Input Voltage
Operating Junction Temperature Range
Symbol
Min
VIN
TJ
0
Max
Unit
12
V
125
o
C
LR1084-4/12
LESHAN RADIO COMPANY, LTD.
Electrical Characteristics
Typicals and limits appearing in normal type apply for TJ = 25oC. Limits appearing in Boldface type apply over
the entire operating junvtion temperature range.
Parameter
Reference Voltage
Output Voltage
Line Regulation
Symbol
VREF
VOUT
'VOUT
Conditions
Min
Typ
Max
Unit
LR1084-ADJ,
IOUT = 10mA, VIN -VOUT = 3V,
10mA d IOUT d 5A, 1.5V d VIN - VOUT d5V
1.238
1.225
1.250
1.250
1.262
1.270
V
LR1084-1.5,
IOUT = 0mA, VIN = 4.5V,
10mAd IOUT d 5A, 3.1Vd VIN d 6V
1.485
1.47
1.5
1.5
1.515
1.53
LR1084-1.8,
IOUT = 0mA, VIN = 4.8V,
10mAd IOUT d 5A, 3.4Vd VIN d 6V
1.782
1.764
1.8
1.8
1.818
1.836
V
LR1084-2.5,
IOUT = 0mA, VIN = 5.5V,
10mAd IOUT d 5A, 4.1Vd VIN d 7V
2.475
2.45
2.5
2.5
2.525
2.55
LR1084-2.85,
IOUT = 0mA, VIN = 6V,
10mAd IOUT d 5A, 4.5Vd VIN d 8V
2.822
2.793
2.85
2.85
2.879
2.907
LR1084-3.3,
IOUT = 0mA, VIN = 6.3V,
10mAd IOUT d 5A, 4.9Vd VIN d 8V
3.267
3.234
3.3
3.3
3.333
3.366
LR1084-5.0,
IOUT = 0mA, VIN = 8V,
10mAd IOUT d 5A, 6.6Vd VIN d 10V
4.95
4.9
5
5
5.05
5.1
LR1084-ADJ,
IOUT = 10mA, 2.85V d VIN d 10V
0.015
0.035
0.2
0.2
%
LR1084-1.5,
IOUT = 10mA, 3.1V d VIN d 10V
0.5
1
6
6
mV
LR1084-1.8,
IOUT = 10mA, 3.4V d VIN d 10V
0.5
1
6
6
mV
LR1084-2.5,
IOUT = 10mA, 4.1V d VIN d 10V
0.5
1
6
6
mV
LR1084-2.85,
IOUT = 10mA, 4.5V d VIN d 10V
0.5
1
6
6
mV
LR1084-3.3,
IOUT = 10mA, 4.9V d VIN d 10V
0.5
1
6
6
mV
LR1084-5.0,
IOUT = 10mA, 6.6V d VIN d 10V
0.5
1
10
10
mV
LR1084-5/12
LESHAN RADIO COMPANY, LTD.
Electrical Characteristics (Continued)
Typicals and limits appearing in normal type apply for TJ = 25oC. Limits appearing in Boldface type apply over
the entire operating junvtion temperature range.
Parameter
Symbol
Conditions
Load Regulation
'VOUT
Dropout Voltage
Current Limit
ILIMIT
Typ
Max
Unit
LR1084-ADJ, 0mAd I OUT d 5A,
VIN - VOUT = 3V
0.1
0.2
0.3
0.4
%
LR1084-1.5, 0mAd I OUT d 5A,
VIN - VOUT = 3V
3
7
15
20
mV
LR1084-1.8, 0mAd I OUT d 5A,
VIN - VOUT = 3V
3
7
15
20
mV
LR1084-2.5, 0mAd I OUT d 5A,
VIN - VOUT = 3V
3
7
15
20
mV
LR1084-2.85, 0mAd I OUT d 5A,
VIN - VOUT = 3V
3
7
15
20
mV
LR1084-3.3, 0mAd I OUT d 5A,
VIN - VOUT = 3V
3
7
15
20
mV
LR1084-5.0, 0mAd I OUT d 5A,
VIN - VOUT = 3V
5
10
20
35
mV
IO = 5A, 'VREF,'VOUT= 1%
1.3
1.5
V
VIN - VOUT = 3V,
Min
5.5
6.5
A
Minimum
Load Current
VIN = 10V (LR1084-ADJ)
3
10
mA
Quiescent Current
VIN = 10V (LR1084)
5
10
mA
Ripple Rejection
fRIPPLE = 120Hz, COUT = 25PF Tantalum,
IOUT = 5A, VIN - VOUT = 3V
Adjust Pin Current
VIN = 4.25V, IOUT = 10mA
55
120
Adjust Pin Current
Change
10mA dIOUT d5A,
1.5Vd (VIN -VOUT) d 4.5V
0.2
5
Temperature
Stability
IOUT = 10mA, VIN - VOUT = 1.5
0.5
%
Long Term Stability
TA = 125oC, 1000Hrs
0.5
%
RMS Noise
(% of VOUT)
10Hz df d10kHz
0.003
%
Thermal Resistance
Junction -to-Case
QJC
TO-263
TO-220
TO-252
60
72
3
3
dB
PA
PA
0
C/W
LR1084-6/12
LESHAN RADIO COMPANY, LTD.
Typical Performance Characteristics
1.50
2.53
1.45
1.40
2.52
Output Voltage(V)
Dropout Voltage(V)
1.35
1.30
1.25
1.20
1.15
1.10
1.05
2.51
2.50
2.49
1.00
0.95
2.48
0.90
0.85
0.80
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
2.47
5.0
0
25
50
75
100
125
o
TJ( C)
Output Current(A)
Figure 3. Dropout Voltage vs. Output Current
Figure 4. Output Voltage vs. Temperature
80
0.0
75
70
65
60
-0.4
Iadj(uA)
Line regulation(mV)
-0.2
-0.6
55
50
45
40
35
-0.8
30
25
-1.0
20
0
25
50
75
100
125
o
TJ( C)
Figure 5. Line Regulation vs. Temperature
0
1
2
3
4
5
Io(A)
ADJUST PIN CURRENT VS. OUTPUT CURRENT
Figure 6. Adjust Pin Current vs. Output Current
LR1084-7/12
LESHAN RADIO COMPANY, LTD.
Typical Performance Characteristics (Continued)
1.40
8
Short Circuit Current(A)
Dropout Voltage(V)
7
1.35
1.30
1.25
6
5
4
3
2
1
1.20
0
0
25
50
75
100
o
TJ( C)
Figure 7. Dropout Voltage vs. Temperature
Figure 9. Load Transient Response
125
0
2
4
6
8
10
12
Dropout Voltage(V)
Short Circuit Current vs Dropout Voltage
Figure 8. Short Circuit Current vs. Dropout Voltage
Figure 10. Line Transient Response
LR1084-8/12
LESHAN RADIO COMPANY, LTD.
Typical Applications
Adjustable Output Voltage V OUT =V REF *(1+R2/R1)+I ADJ *R2 Or V OUT =V REF (1+R2/R1) , V REF =1.25V
VIN
3
2
LR1084-XX
IN
VOUT
OUT
22UF
10UF
1
Fig 11. Fixed Output Regulator
VIN
3
VOUT=1.25V
2
IN
LR1084-ADJ
OUT
ADJ
10UF
22UF
1
R1
120
FIG 12 . Adjustable Output 1.25 Voltage Application Circuit
VIN
3
VOUT
2
IN
LR1084-ADJ
OUT
ADJ
10UF
22UF
1
R1
120
VREF
R2
FIG 13 . Adjustable Output Voltage Application Circuit
VIN
3
IN
10UF
VOUT
2
LR1084-ADJ
OUT
ADJ
22UF
1
R1
120
R2
VREF
10UF
FIG 14 . Adjustable Output Voltage Application with improved Ripple Rejection
LR1084-9/12
LESHAN RADIO COMPANY, LTD.
Mechanical Dimensions
TO-263-3L
TO-263
Unit: mm
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f
e
e
f
f
e
e
e
fe
f
f
f
f
efe
LR1084-10/12
LESHAN RADIO COMPANY, LTD.
Mechanical Dimensions (Continued)
TO-263-2L
Unit: mm
e
f
e
f
f
f
e
f
f
f
e
e
e
fe
efe
LR1084-11/12
LESHAN RADIO COMPANY, LTD.
Mechanical Dimensions (Continued)
TO-220
Unit: mm
f
¶f
f
f
f
e
f
e
f
e
f
f
f
e
e
f
LR1084-12/12
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