LESHAN RADIO COMPANY, LTD.
General Description
The
LR1084
is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 5A of
load current.
The series features on-chip thermal limiting which pro-
vides protection against any combination of overload
and ambient temperatures that would create excessive
junction temperatures. It also includes a trimmed band-
gap 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.
Features
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
125
o
C
Line Regulation: 0.015% (Typical)
Load Regulation: 0.2% (Typical)
Applications
High Efficiency Linear Regulators
Battery Chargers
Post Regulation for Switching Supply
Microprocessor Supply
Desktop PCs, RISC and Embedded Processors'
Supply
TO-263-3L
TO-263-2L
TO-252
TO-220
Figure 1. Package Types of
LR1084
LR1084-1/12
LESHAN RADIO COMPANY, LTD.
Ordering Information
Part Number
Marking ID
Packing Type
LR1084D-ADJ
LR1084D-ADJ
Tube/Tape/Reel
TO-252
0 to 125
o
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
LR1084T-ADJ
LR1084T-ADJ
Tube
TO-220
0 to 125
o
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
LR1084S-ADJ
LR1084S-ADJ
TO-263-3L
Tube/Tape/Reel
0 to 125
o
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 125
o
C
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.
LR1084
X - Y
Circuit Type
Package
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
Package
Temperature Range
D: TO-252
T: TO-220
S: TO-263-3L
S2: TO-263-2L
LR1084-3/12
LESHAN RADIO COMPANY, LTD.
Absolute Maximum Ratings (Note 1)
Parameter
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
ESD (Human Body Model)
Symbol
T
J
T
S
T
LEAD
ESD
-65
Min
Max
150
150
300
2000
Unit
o
C
o
C
C
o
V
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
V
IN
T
J
0
Min
Max
12
125
Unit
V
o
C
LR1084-4/12
LESHAN RADIO COMPANY, LTD.
Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25
o
C.
Limits appearing in
Boldface
type apply over
the entire operating junvtion temperature range.
Parameter
Reference Voltage
Symbol
V
REF
Conditions
LR1084-ADJ,
I
OUT
= 10mA, V
IN
-V
OUT
= 3V,
10mA I
OUT
5A, 1.5V V
IN
- V
OUT
LR1084-1.5,
I
OUT
= 0mA, V
IN
= 4.5V,
10mA I
OUT
5A, 3.1V V
IN
LR1084-1.8,
I
OUT
= 0mA, V
IN
= 4.8V,
10mA I
OUT
5A, 3.4V V
IN
LR1084-2.5,
I
OUT
= 0mA, V
IN
= 5.5V,
10mA I
OUT
5A, 4.1V V
IN
LR1084-2.85,
I
OUT
= 0mA, V
IN
= 6V,
10mA I
OUT
5A, 4.5V V
IN
LR1084-3.3,
I
OUT
= 0mA, V
IN
= 6.3V,
10mA I
OUT
5A, 4.9V V
IN
LR1084-5.0,
I
OUT
= 0mA, V
IN
= 8V,
10mA I
OUT
5A, 6.6V V
IN
Line Regulation
V
OUT
LR1084-ADJ,
I
OUT
= 10mA, 2.85V
LR1084-1.5,
I
OUT
= 10mA, 3.1V
LR1084-1.8,
I
OUT
= 10mA, 3.4V
LR1084-2.5,
I
OUT
= 10mA, 4.1V
LR1084-2.85,
I
OUT
= 10mA, 4.5V
LR1084-3.3,
I
OUT
= 10mA, 4.9V
LR1084-5.0,
I
OUT
= 10mA, 6.6V
Min
1.238
1.225
Typ
1.250
1.250
Max
1.262
1.270
Unit
V
5V
Output Voltage
V
OUT
V
6V
1.485
1.47
1.5
1.5
1.515
1.53
6V
1.782
1.764
2.475
2.45
1.8
1.8
2.5
2.5
1.818
1.836
2.525
2.55
7V
8V
2.822
2.793
2.85
2.85
2.879
2.907
8V
3.267
3.234
3.3
3.3
3.333
3.366
10V
4.95
4.9
5
5
0.015
0.035
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
0.5
1
5.05
5.1
0.2
0.2
6
6
6
6
6
6
6
6
6
6
10
10
%
mV
mV
mV
mV
mV
mV
V
IN
10V
V
IN
10V
V
IN
10V
V
IN
10V
V
IN
10V
V
IN
10V
V
IN
10V
LR1084-5/12
ADI Reference Circuit
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