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May 2003
s
TYPICAL DROPOUT 1.3V (AT 5A)
s
THREE TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE 1.5, 1.8V, 2.5V, 2.85V,
3.3V, 3.6V, 5V, 8V, 9V, 12V.
s
GUARANTEED OUTPUT CURRENT UP TO
5A
s
OUPUT TOLERANCE
1% AT 25C AND
2% IN FULL TEMPERATURE RANGE
s
INTERNAL POWER AND THERMAL LIMIT
s
WIDE OPERATING TEMPERATURE RANGE
-40C TO 125C
s
PACKAGE AVAILABLE : TO-220, D
2
PAK,
D
2
PAK/A
s
PINOUT COMPATIBILITY WITH STANDARD
ADJUSTABLE VREG
DESCRIPTION
The LD1084 is a LOW DROP Voltage Regulator
able to provide up to 5A of Output Current.
Dropout is guaranteed at a maximum of 1.5V at
the maximum output current, decreasing at lower
loads. The LD1084 is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance .
A 2.85V output version is suitable for SCSI-2
active termination. Unlike PNP regulators, where
a part of the output current is wasted as quiescent
current, the LD1084 quiescent current flows into
the load, so increase efficiency. Only a 10F
minimum capacitor is need for stability.
The device is supplied in TO-220, D
2
PAK and
D
2
PAK/A. On chip trimming allows the regulator to
reach a very tight output voltage tolerance, within
1% at 25C.
LD1084
SERIES
5A LOW DROP POSITIVE VOLTAGE
REGULATOR ADJUSTABLE AND FIXED
SCHEMATIC DIAGRAM
TO-220
D
2
PAK
D
2
PAK/A
LD1084 SERIES
2/18
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
APPLICATION CIRCUITS
CONNECTION DIAGRAM (top view)
Symbol
Parameter
Value
Unit
V
I
DC Input Voltage
30
V
I
O
Output Current
Internally Limited
mA
P
D
Power Dissipation
Internally Limited
mW
T
stg
Storage Temperature Range
-55 to +150
C
T
op
Operating Junction Temperature Range
-40 to +125
C
Symbol
Parameter
TO-220
D
2
PAK
Unit
R
thj-case
Thermal Resistance Junction-case
3
3
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
62.5
C/W
R
2
V
O
= V
REF
(1 +
)
R
1
TO-220
D
2
PAK
D
2
PAK/A
LD1084 SERIES
3/18
ORDERING CODES
(*) Available in Tape & Reel with the suffix "R" for fixed versions and "-R" for adjustable version
LECTRICAL CHARACTERISTICS OF LD1084#15 (V
I
=4.5V, C
I
= C
O
=10
F, T
A
= -40 to 125C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
TYPE
D
2
PAK (*)
D
2
PAK/A
OUTPUT VOLTAGE
LD1084V15
LD1084D2T15
LD1084D2M15
1.5 V
LD1084V18
LD1084D2T18
LD1084D2M18
1.8 V
LD1084V25
LD1084D2T25
LD1084D2M25
2.5 V
LD1084V28
LD1084D2T28
LD1084D2M28
2.85 V
LD1084V33
LD1084D2T33
LD1084D2M33
3.3 V
LD1084V36
LD1084D2T36
LD1084D2M36
3.6 V
LD1084V50
LD1084D2T50
LD1084D2M50
5.0 V
LD1084V80
LD1084D2T80
LD1084D2M80
8.0 V
LD1084V90
LD1084D2T90
LD1084D2M90
9.0 V
LD1084V120
LD1084D2T120
LD1084D2M120
12.0 V
LD1084V
LD1084D2T
LD1084D2M
ADJ
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 0 mA
T
J
= 25C
1.485
1.5
1.515
V
I
O
= 0 to 5A V
I
= 3.1 to 30V (note 1)
1.47
1.5
1.53
V
V
O
Line Regulation
I
O
= 0 mA
V
I
= 3.1 to 18V
T
J
= 25C
0.5
6
mV
I
O
= 0 mA
V
I
= 3.1 to 15V
0.1
6
mV
V
O
Load Regulation
I
O
= 0 to 5A T
J
= 25C
3
15
mV
I
O
= 0 to 5A
7
20
V
V
d
Dropout Voltage
I
O
=5 A
1.3
1.5
V
I
q
Quiescent Current
V
I
30V
5
10
mA
I
sc
Short Circuit Current
V
I
- V
O
= 5V
5.5
6.5
A
V
I
- V
O
= 25V
0.5
0.7
A
Termal Regulation
T
A
= 25C, 30ms pulse
0.003
0.015
%/W
SVR
Supply Voltage Rejection
f = 120 Hz,
C
O
= 25
F, I
O
= 5A
V
I
= 6.8
3V
60
75
dB
eN
RMS Output Noise Voltage
(% of V
O
)
T
A
= 25C
f =10Hz to 10KHz
0.003
%
S
Temperature Stability
0.5
%
S
Long Term Stability
T
A
= 125C
1000Hrs
0.5
%
LD1084 SERIES
4/18
ELECTRICAL CHARACTERISTICS OF LD1084#18 (V
I
=4.8V, C
I
= C
O
=10
F, T
A
= -40 to 125C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1084#25 (V
I
=5.5V, C
I
= C
O
=10
F, T
A
= -40 to 125C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 0 mA
T
J
= 25C
1.782
1.8
1.818
V
I
O
= 0 to 5A V
I
= 3.4 to 30V (note 1)
1.764
1.8
1.836
V
V
O
Line Regulation
I
O
= 0 mA
V
I
= 3.4 to 18V
T
J
= 25C
0.5
6
mV
I
O
= 0 mA
V
I
= 3.4 to 15V
0.1
6
mV
V
O
Load Regulation
I
O
= 0 to 5A T
J
= 25C
3
15
mV
I
O
= 0 to 5A
7
20
V
V
d
Dropout Voltage
I
O
=5 A
1.3
1.5
V
I
q
Quiescent Current
V
I
30V
5
10
mA
I
sc
Short Circuit Current
V
I
- V
O
= 5V
5.5
6.5
A
V
I
- V
O
= 25V
0.5
0.7
A
Termal Regulation
T
A
= 25C, 30ms pulse
0.003
0.015
%/W
SVR
Supply Voltage Rejection
f = 120 Hz,
C
O
= 25
F, I
O
= 5A
V
I
= 6.8
3V
60
75
dB
eN
RMS Output Noise Voltage
(% of V
O
)
T
A
= 25C
f =10Hz to 10KHz
0.003
%
S
Temperature Stability
0.5
%
S
Long Term Stability
T
A
= 125C
1000Hrs
0.5
%
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 0 mA
T
J
= 25C
2.475
2.5
2.525
V
I
O
= 0 to 5A V
I
= 4.1 to 30V (note 1)
2.45
2.5
2.55
V
V
O
Line Regulation
I
O
= 0 mA
V
I
= 4.1 to 18V
T
J
= 25C
0.5
6
mV
I
O
= 0 mA
V
I
= 4.1 to 18V
0.1
6
mV
V
O
Load Regulation
I
O
= 0 to 5A T
J
= 25C
3
15
mV
I
O
= 0 to 5A
7
20
V
V
d
Dropout Voltage
I
O
=5 A
1.3
1.5
V
I
q
Quiescent Current
V
I
30V
5
10
mA
I
sc
Short Circuit Current
V
I
- V
O
= 5V
5.5
6.5
A
V
I
- V
O
= 25V
0.5
0.7
A
Termal Regulation
T
A
= 25C, 30ms pulse
0.003
0.015
%/W
SVR
Supply Voltage Rejection
f = 120 Hz,
C
O
= 25
F, I
O
= 5A
V
I
= 7.5
3V
60
72
dB
eN
RMS Output Noise Voltage
(% of V
O
)
T
A
= 25C
f =10Hz to 10KHz
0.003
%
S
Temperature Stability
0.5
%
S
Long Term Stability
T
A
= 125C
1000Hrs
0.5
%
LD1084 SERIES
5/18
ELECTRICAL CHARACTERISTICS OF LD1084#285 (V
I
=5.85V, C
I
= C
O
=10
F, T
A
= -40 to 125C,
unless otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1084#33 (V
I
=6.3V, C
I
= C
O
=10
F, T
A
= -40 to 125C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 0 mA
T
J
= 25C
2.821
2.85
2.879
V
I
O
= 0 to 5A V
I
= 4.5 to 30V (note 1)
2.793
2.85
2.907
V
V
O
Line Regulation
I
O
= 0 mA
V
I
= 4.5 to 18V
T
J
= 25C
0.5
6
mV
I
O
= 0 mA
V
I
= 4.5 to 18V
0.1
6
mV
V
O
Load Regulation
I
O
= 0 to 5A T
J
= 25C
3
15
mV
I
O
= 0 to 5A
7
20
V
V
d
Dropout Voltage
I
O
=5 A
1.3
1.5
V
I
q
Quiescent Current
V
I
30V
5
10
mA
I
sc
Short Circuit Current
V
I
- V
O
= 5V
5.5
6.5
A
V
I
- V
O
= 25V
0.5
0.7
A
Termal Regulation
T
A
= 25C, 30ms pulse
0.003
0.015
%/W
SVR
Supply Voltage Rejection
f = 120 Hz,
C
O
= 25
F, I
O
= 5A
V
I
= 7.85
3V
60
72
dB
eN
RMS Output Noise Voltage
(% of V
O
)
T
A
= 25C
f =10Hz to 10KHz
0.003
%
S
Temperature Stability
0.5
%
S
Long Term Stability
T
A
= 125C
1000Hrs
0.5
%
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage
I
O
= 0 mA
T
J
= 25C
3.267
3.3
3.333
V
I
O
= 0 to 5A V
I
= 4.9 to 30V (note 1)
3.234
3.35
3.366
V
V
O
Line Regulation
I
O
= 0 mA
V
I
= 4.9 to 18V
T
J
= 25C
0.5
6
mV
I
O
= 0 mA
V
I
= 4.9 to 18V
0.1
6
mV
V
O
Load Regulation
I
O
= 0 to 5A T
J
= 25C
3
15
mV
I
O
= 0 to 5A
7
20
V
V
d
Dropout Voltage
I
O
=5 A
1.3
1.5
V
I
q
Quiescent Current
V
I
30V
5
10
mA
I
sc
Short Circuit Current
V
I
- V
O
= 5V
5.5
6.5
A
V
I
- V
O
= 25V
0.5
0.7
A
Termal Regulation
T
A
= 25C, 30ms pulse
0.003
0.015
%/W
SVR
Supply Voltage Rejection
f = 120 Hz,
C
O
= 25
F, I
O
= 5A
V
I
= 8.3
3V
60
72
dB
eN
RMS Output Noise Voltage
(% of V
O
)
T
A
= 25C
f =10Hz to 10KHz
0.003
%
S
Temperature Stability
0.5
%
S
Long Term Stability
T
A
= 125C
1000Hrs
0.5
%
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