Date: 7/24/06 Rev H SP085 3A Low Dropout Linear Regulator
2006 Sipex Corporation
general Description
The S
P1085 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 3A of load
current. The series features on-chip thermal shutdown. It also includes a bandgap reference and a current limiting circuit.
The S
P1085 is available in 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5.0V and adjustable versions. The fixed versions integrate
the adjust resistors. The adjustable version can set the output voltage with two external resistors.
The SP1085 series is
available in standard packages of TO-263-3L, TO-220 and TO-252.
features
Low Dropout Voltage: Typical 1.3V at 3A
Current Limiting and Thermal Protection
Output Current: 3A
Current Limit: 4.5A
Operating Junction Temperature: 0 to 125
o
C
Line Regulation: 0.015% (Typical)
Load Regulation: 0.1% (Typical)
Available in RoHS Compliant, Lead Free
Packaging
Applications
High Efficiency Linear Regulators
Battery Charger
Post Regulation for Switching Supplies
Microprocessor Supply
Mother Board Power Supplies
DVD - Video Player
Telecom Equipment
Set Top
Boxes and Web Box Modular Supplies
Figure . Package Types of SP085
TO-252
TO-220
TO-263-3L
TO-220
INPUT
OUTPUT
ADJ/GND
1
2
3
SP1085
3A Low Dropout Linear Regulator
Solved by
TM
2
Date: 7/24/06 Rev H SP085 3A Low Dropout Linear Regulator
2006 Sipex Corporation
Figure 2. Pin Configuration of SP085 (Top View)
Pin configuration
functional Block Diagram
Figure 3. Functional Block Diagram of S
P085
V Package
(TO-220)
V
1
Package
(TO-263-3L)
INPUT
OUTPUT
ADJ/GND
1
2
3
1
2
3
ADJ/GND
OUTPUT
V
2
Package
(TO-252)
1
2
3
ADJ/GND
OUTPUT
INPUT
INPUT
Thermal
Protection
+
-
For Adjustable Output, disconnect A and A2, connect B
INPUT
OUTPUT
ADJ/
GND
A
A2
B
For Fixed Output, connect A and A2, disconnect B
3
Date: 7/24/06 Rev H SP085 3A Low Dropout Linear Regulator
2006 Sipex Corporation
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 Max-
imum Ratings" for extended periods may affect device reliability.
Recommended operating conditions
Parameter
Symbol
Min
Max
Unit
Operating Junction Temperature
T
J
150
o
C
Storage Temperature
T
S
-65
150
o
C
Lead Temperature (Soldering, 10 sec.)
T
LEAD
300
o
C
ESD (Human Body Model)
ESD
2000
V
Parameter
Symbol
Min
Max
Unit
Input Voltage
V
IN
12
V
Operating Junction Temperature Range
T
J
0
125
o
C
Absolute maximum Ratings (note 1)
4
Date: 7/24/06 Rev H SP085 3A Low Dropout Linear Regulator
2006 Sipex Corporation
electrical characteristics
Parameter
Symbol Conditions
Min
Typ
Max
Unit
Reference Voltage
V
REF
SP1085-ADJ,
I
OUT
=10mA,V
IN
-V
OUT
= 3V, T
J
= 25
o
C,
10mA I
OUT
3A, 1.5V V
IN
- V
OUT
5V
1.238
1.225
1.250
1.250
1.262
1.275
V
Output Voltage
V
OUT
SP1085-1.5,
I
OUT
=0mA, V
IN
= 4.5V, T
J
= 25
o
C,
10mA I
OUT
3A, 3.1V V
IN
6V
1.485
1.47
1.5
1.5
1.515
1.53
V
SP1085-1.8,
I
OUT
= 0mA, V
IN
= 4.8V, T
J
= 25
o
C,
10mA I
OUT
A, 3.4V V
IN
7V
1.782
1.764
1.8
1.8
1.818
1.836
V
SP1085-2.5,
I
OUT
= 0mA, V
IN
= 5.5V, T
J
= 25
o
C,
10mA I
OUT
3A, 4.1V V
IN
7V
2.475
2.45
2.5
2.5
2.525
2.55
V
SP1085-2.85,
I
OUT
= 0mA, V
IN
= 6V, T
J
= 25
o
C,
10mA I
OUT
3A, 4.5V V
IN
8V
2.821
2.793
2.85
2.85
2.879
2.907
V
SP1085-3.3,
I
OUT
= 0mA, V
IN
= 6.3V, T
J
= 25
o
C,
10mA I
OUT
3A, 4.9V V
IN
8V
3.267
3.234
3.3
3.3
3.333
3.366
V
SP1085-5.0,
I
OUT
= 0mA, V
IN
= 8V, T
J
= 25
o
C,
10mA I
OUT
3A, 6.6V V
IN
10V
4.95
4.9
5
5
5.05
5.1
V
Line Regulation
V
OUT
SP1085-ADJ, I
OUT
= 10mA,
2.85V V
IN
10V
0.015
0.035
0.2
0.2
%
SP1085-1.5, I
OUT
= 10mA,
3.1V V
IN
10V
0.5
1
6
6
mV
SP1085-1.8, I
OUT
= 10mA,
3.4V V
IN
10V
0.5
1
6
6
mV
SP1085-2.5, I
OUT
= 10mA,
4.1V V
IN
10V
0.5
1
6
6
mV
SP1085-2.85, I
OUT
= 10mA,
4.5V V
IN
10V
0.5
1
6
6
mV
SP1085-3.3, I
OUT
= 10mA,
4.9V V
IN
10V
0.5
1
6
6
mV
Typicals and limits appearing in normal type apply for T
J
= 25
o
C. Limits appearing in Boldface type apply over
the entire operating junction temperature range 0 to 125
o
C.
5
Date: 7/24/06 Rev H SP085 3A Low Dropout Linear Regulator
2006 Sipex Corporation
electrical characteristics (continued)
Parameter
Symbol Conditions
Min
Typ
Max Unit
SP1085-5.0, I
OUT
= 10mA,
6.6V V
IN
10V
0.5
1
10
10
mV
Load Regulation
V
OUT
SP1085-ADJ, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
0.1
0.2
0.3
0.4
%
SP1085-1.5, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
3
7
15
20
mV
SP1085-1.8, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
3
7
15
20
mV
SP1085-2.5, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
3
7
15
20
mV
SP1085-2.85, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
3
7
15
20
mV
SP1085-3.3, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
3
7
15
20
mV
SP1085-5.0, 0mA I
OUT
3A,
V
IN
- V
OUT
= 3V
5
10
20
35
mV
Dropout Voltage
I
O
= 3A, V
REF,
V
OUT
= 1%
1.3
1.5
V
Current Limit
I
LIMIT
V
IN
- V
OUT
= 3V,
3.2
Minimum Load Current
V
IN
= 10V (SP1085-ADJ)
3
10
mA
Quiescent Current
V
IN
= 10V (SP1085)
5
10
mA
Ripple Rejection
f
RIPPLE
= 120Hz, C
OUT
= 25 F Tantalum,
I
OUT
= 3A, V
IN
- V
OUT
= 3V
60
72
dB
Adjust Pin Current
V
IN
= 4.25V, I
OUT
= 10mA
55
120
A
Adjust Pin Current
Change
10mA I
OUT
A,
1.5V V
IN
-V
OUT
6V
0.2
5
A
Long Term Stability
T
A
= 125
o
C, 1000Hrs
0.5
%
Temperature Stability
I
OUT
= 10mA, V
IN
- V
OUT
= 1.5V
0.5
%
RMS Noise
(% of V
OUT
)
T
A
= 25
o
C, 10Hz f 10kHz
0.003
%
Thermal Resistance
Junction-to-Case
JC
3
3
o
C / W
Typicals and limits appearing in normal type apply for T
J
= 25
o
C. Limits appearing in Boldface type apply over
the entire operating junction temperature range 0 to 125
o
C.
TO-263
TO-220
TO-252
4.5
A
4
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