1/21
February 2005
I
TYPICAL DROPOUT 1.3V AT 1.5A
I
THREE TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE 1.5V, 1.8V, 2.5V, 2.85V,
3.3V, 3.6V, 5V, 8V, 9V, 12V.
I
GUARANTEED OUTPUT CURRENT UP TO
1.5A
I
OUPUT TOLERANCE
1% AT 25C AND
2% IN FULL TEMPERATURE RANGE
I
INTERNAL POWER AND THERMAL LIMIT
I
WIDE OPERATING TEMPERATURE RANGE
-40C TO 125C
I
PACKAGE AVAILABLE: TO-220, D
2
PAK,
D
2
PAK/A, DPAK
I
PINOUT COMPATIBILITY WITH STANDARD
ADJUSTABLE VREG
DESCRIPTION
The LD1086 is a LOW DROP Voltage Regulator
able to provide up to 1.5A of Output Current.
Dropout is guaranteed at a maximum of 1.2V at
the maximum output current, decreasing at lower
loads. The LD1086 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 LD1086 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, D
2
PAK/A
and DPAK. On chip trimming allows the regulator
to reach a very tight output voltage tolerance,
within 1% at 25C.
Table 1: Order Codes
(*) Available in Tape & Reel with the suffix "TR".
TO-220
D
2
PAK (*)
D
2
PAK/A (*)
DPAK (*)
OUTPUT VOLTAGE
LD1086V15
LD1086D2T15
LD1086D2M15
LD1086DT15
1.5 V
LD1086V18
LD1086D2T18
LD1086D2M18
LD1086DT18
1.8 V
LD1086V25
LD1086D2T25
LD1086D2M25
LD1086DT25
2.5 V
LD1086V28
LD1086D2T28
LD1086D2M28
LD1086DT28
2.85 V
LD1086V33
LD1086D2T33
LD1086D2M33
LD1086DT33
3.3 V
LD1086V36
LD1086D2T36
LD1086D2M36
LD1086DT36
3.6 V
LD1086V50
LD1086D2T50
LD1086D2M50
LD1086DT50
5.0 V
LD1086V80
LD1086D2T80
LD1086D2M80
LD1086DT80
8.0 V
LD1086V90
LD1086D2T90
LD1086D2M90
LD1086DT90
9.0 V
LD1086V12
LD1086D2T12
LD1086D2M12
LD1086DT12
12.0 V
LD1086V
LD1086D2T
LD1086D2M
LD1086DT
ADJ
LD1086
SERIES
1.5A LOW DROP POSITIVE VOLTAGE
REGULATOR ADJUSTABLE AND FIXED
TO-220
DPAK
D
2
PAK
D
2
PAK/A
Rev. 13
LD1086 SERIES
2/21
Figure 1: Pin Connection (top view)
Table 2: 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.
Table 3: Thermal Data
Figure 2: Application Circuits
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
DPAK
Unit
R
thj-case
Thermal Resistance Junction-case
3
3
8
C/W
R
thj-amb
Thermal Resistance Junction-ambient
50
62.5
C/W
TO-220
D
2
PAK
D
2
PAK/A
DPAK
R
2
V
O
= V
REF
(1 +
)
R
1
LD1086 SERIES
3/21
Figure 3: Schematic Diagram
Table 4: Electrical Characteristics Of LD1086#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.
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
O
Output Voltage (note 1)
I
O
= 0 mA T
J
= 25C
1.485
1.5
1.515
V
I
O
= 0 to 1.5A
V
I
= 3.4 to 30V
1.47
1.5
1.53
V
V
O
Line Regulation
I
O
= 0 mA V
I
= 3.1 to 18V T
J
= 25C
0.2
4
mV
I
O
= 0 mA V
I
= 3.1 to 15V
0.4
4
mV
V
O
Load Regulation
I
O
= 0 to 1.5A
T
J
= 25C
0.5
8
mV
I
O
= 0 to 1.5A
1
16
mV
V
d
Dropout Voltage
I
O
= 1.5A
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
1.5
2
A
V
I
- V
O
= 25V
0.05
0.02
A
Thermal Regulation
T
A
= 25C, 30ms pulse
0.01
0.04
%/W
SVR
Supply Voltage Rejection
f = 120 Hz, C
O
= 25
F, I
O
= 1.5A
V
I
= 6.5
3V
60
82
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
%
LD1086 SERIES
4/21
Table 5: Electrical Characteristics Of LD1086#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.
Table 6: Electrical Characteristics Of LD1086#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 (note 1)
I
O
= 0 mA T
J
= 25C
1.782
1.8
1.818
V
I
O
= 0 to 1.5A
V
I
= 3.4 to 30V
1.764
1.8
1.836
V
V
O
Line Regulation
I
O
= 0 mA V
I
= 3.4 to 18V T
J
= 25C
0.2
4
mV
I
O
= 0 mA V
I
= 3.4 to 15V
0.4
4
mV
V
O
Load Regulation
I
O
= 0 to 1.5A
T
J
= 25C
0.5
8
mV
I
O
= 0 to 1.5A
1
16
mV
V
d
Dropout Voltage
I
O
= 1.5A
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
1.5
2
A
V
I
- V
O
= 25V
0.05
0.02
A
Thermal Regulation
T
A
= 25C, 30ms pulse
0.01
0.04
%/W
SVR
Supply Voltage Rejection
f = 120 Hz, C
O
= 25
F, I
O
= 1.5A
V
I
= 6.8
3V
60
82
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 (note 1)
I
O
= 0 mA T
J
= 25C
2.475
2.5
2.525
V
I
O
= 0 to 1.5A
V
I
= 4.1 to 30V
2.45
2.5
2.55
V
V
O
Line Regulation
I
O
= 0 mA V
I
= 4.1 to 18V T
J
= 25C
0.2
4
mV
I
O
= 0 mA V
I
= 4.1 to 18V
0.4
4
mV
V
O
Load Regulation
I
O
= 0 to 1.5A
T
J
= 25C
0.5
8
mV
I
O
= 0 to 1.5A
1
16
mV
V
d
Dropout Voltage
I
O
= 1.5A
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
1.5
2
A
V
I
- V
O
= 25V
0.05
0.2
A
Thermal Regulation
T
A
= 25C, 30ms pulse
0.008
0.04
%/W
SVR
Supply Voltage Rejection
f = 120 Hz, C
O
= 25
F, I
O
= 1.5A
V
I
= 7.5
3V
60
81
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
%
LD1086 SERIES
5/21
Table 7: Electrical Characteristics Of LD1086#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.
Table 8: Electrical Characteristics Of LD1086#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 (note 1)
I
O
= 0 mA T
J
= 25C
2.821
2.85
2.879
V
I
O
= 0 to 1.5A
V
I
= 4.5 to 30V
2.793
2.85
2.907
V
V
O
Line Regulation
I
O
= 0 mA V
I
= 4.5 to 18V T
J
= 25C
0.2
6
mV
I
O
= 0 mA V
I
= 4.5 to 18V
0.5
6
mV
V
O
Load Regulation
I
O
= 0 to 1.5A
T
J
= 25C
1
12
mV
I
O
= 0 to 1.5A
2
20
mV
V
d
Dropout Voltage
I
O
= 1.5A
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
1.5
2
A
V
I
- V
O
= 25V
0.05
0.2
A
Thermal Regulation
T
A
= 25C, 30ms pulse
0.01
0.04
%/W
SVR
Supply Voltage Rejection
f = 120 Hz, C
O
= 25
F, I
O
= 1.5A
V
I
= 7.85
3V
60
80
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 (note 1)
I
O
= 0 mA T
J
= 25C
3.267
3.3
3.333
V
I
O
= 0 to 1.5A`
V
I
= 4.9 to 30V
3.234
3.3
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
1
6
mV
V
O
Load Regulation
I
O
= 0 to 1.5A
T
J
= 25C
1
10
mV
I
O
= 0 to 1.5A
7
25
mV
V
d
Dropout Voltage
I
O
= 1.5A
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
1.5
2
A
V
I
- V
O
= 25V
0.05
0.2
A
Thermal Regulation
T
A
= 25C, 30ms pulse
0.008
0.04
%/W
SVR
Supply Voltage Rejection
f = 120 Hz, C
O
= 25
F, I
O
= 1.5A
V
I
= 8.3
3V
60
79
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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