®
LD1086
SERIES
1.5A LOW DROP FIXED AND ADJUSTABLE
POSITIVE VOLTAGE REGULATORS
s
s
s
s
s
s
s
s
TYPICAL DROPOUT VOLTAGE 1.3V AT 1.5A
THREE TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLATGE 1.8V, 2.5V, 2.85V, 3.3V,
3.6V, 5V, 8V, 9V, 12V
GUARANTEED OUTPUT CURRENT UP TO
1.5A
OUTPUT TOLERANCE
±1%
AT 25
o
C AND
±2%
IN FULL TEMPERATURE RANGE
INTERNAL POWER AND THERMAL LIMIT
WIDE OPERATING TEMPERATURE RANGE
-40
o
C TO 125
o
C
PACKAGE AVAILABLE: TO-220 D
2
PAK
PINOUT COMPATIBILITY WITH STANDARD
ADJUSTABLE VOLTAGE REGULATORS
TO-220
D
2
PAK
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 1.5V at
the maximum output current, decreasing at
lower loads. The LD1086 is a pin compatible
with 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 flow into the load, so
increase efficency. Only a 10
µ
F minimum
capacitor is needed for stability. The device is
supplied in TO-220 and D
2
PAK packages. On
chip trimming allows the regulator to reach a
very tight output voltage tolerance, within
±
1%
at 25
o
C.
BLOCK DIAGRAM
November 1999
1/15
LD1086 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
V
IN
I
OUT
P
to t
T
stg
T
o p
DC Input Voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
Parameter
Value
30
Internally Limited
Internally Limited
-50 to 150
-40 to 125
Unit
V
mA
mW
o
o
C
C
Absolute Maximum Ratings are those value beyond which damage to the device may occur. Functional operation under these condition is
not implied. Over the above suggested Max Power Dissipation a Short Circuit could definetively damage the device.
THERMAL DATA
Symbol
Parameter
TO-220
3
50
D
2
PAK
3
62.5
Unit
o
o
R
thj- ca se
Thermal Resistance Junction-case
R
thj- amb
Thermal Resistance Junction-ambient
C/W
C/W
APPLICATION CIRCUIT
CONNECTION DIAGRAM AND ORDERING NUMBERS
(top view)
TO-220
TO-220
LD1086V18
LD1086V25
LD1086V28
LD1086V33
LD1086V36
LD1086V50
LD1086V80
LD1086V90
LD1086V120
LD1086V
D
2
PAK (**)
LD1086D2T18
LD1086D2T25
LD1086D2T28
LD1086D2T33
LD1086D2T36
LD1086D2T50
LD1086D2T80
LD1086D2T90
LD1086D2T120
LD1086D2T
D
2
PAK
Output Voltage
1.8V
2.5V
2.85V
3.3V
3.6V
5V
8V
9V
12V
ADJUSTABLE VERSION
(**) Available in Tape & Reel with the suffix ”R” for fixed version and ”-R” for adjustable version.
2/15
LD1086 SERIES
ELECTRICAL CHARACTERISTICS FOR LD1086#18
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 4.8 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125 C
o
Test Conditions
I
O
= 0 mA
I
O
= 0 to 1.5 A
T
j
= 25
o
C
V
IN
= 3.4 to 30 V
Min.
1.782
1.764
Typ.
1.8
1.8
0.2
0.4
0.5
1
1.3
5
Max.
1.818
1.836
4
4
8
16
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 3.4 to 18 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 3.4 to 18 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
=1.5 A
f = 120 Hz
V
IN
= 6.8
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
82
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1086#25
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 5.5 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125
o
C
I
O
= 0 mA
I
O
= 0 to 1.5 A
Test Conditions
T
j
= 25 C
V
IN
= 4.1 to 30 V
o
Min.
2.475
2.45
Typ.
2.5
2.5
0.2
0.4
0.5
1
1.3
5
Max.
2.525
2.55
5
5
10
18
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 4.1 to 18 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 4.1 to 18 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
= 1.5 A f = 120 Hz
V
IN
= 7.5
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
81
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
3/15
LD1086 SERIES
ELECTRICAL CHARACTERISTICS FOR LD1086#285
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 5.85 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125 C
o
Test Conditions
I
O
= 0 mA
I
O
= 0 to 1.5 A
T
j
= 25
o
C
V
IN
= 4.5 to 30 V
Min.
2.821
2.793
Typ.
2.85
2.85
0.2
0.5
1
2
1.3
5
Max.
2.879
2.907
6
6
12
20
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 4.5 to 18 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 4.5 to 18 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
= 1.5 A f = 120 Hz
V
IN
= 7.85
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
80
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1086#33
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 6.3 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125
o
C
I
O
= 0 mA
I
O
= 0 to 1.5 A
Test Conditions
T
j
= 25 C
V
IN
= 4.9 to 30 V
o
Min.
3.267
3.234
Typ.
3.3
3.3
0.5
1
3
7
1.3
5
Max.
3.333
3.366
10
10
15
25
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 4.9 to 18 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 4.9 to 18 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
= 1.5 A f = 120 Hz
V
IN
= 8.3
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
79
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
4/15
LD1086 SERIES
ELECTRICAL CHARACTERISTICS FOR LD1086#36
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 6.6 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125 C
o
Test Conditions
I
O
= 0 mA
I
O
= 0 to 1.5 A
T
j
= 25
o
C
V
IN
= 5.2 to 30 V
Min.
3.564
3.528
Typ.
3.6
3.6
0.5
1
3
7
1.3
5
Max.
3.636
3.672
10
10
15
25
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 5.2 to 18 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 5.2 to 18 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
= 1.5 A f = 120 Hz
V
IN
= 8.6
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
78
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS FOR LD1086#50
(refer to the test circuits,
T
j
= -40 to 125
o
C, V
IN
= 8 V, C
IN
= C
O
= 10
µF
unless otherwise specified)
Symbol
V
O
V
O
∆
V
O
∆
V
O
∆
V
O
∆
V
O
V
d
I
d
I
SC
Parameter
Output Voltage
Output Voltage (Note 1)
Line Regulation
Line Regulation
Load Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Thermal Regulation
SVR
eN
S
S
Supply Voltage Rejection
Output Noise Voltage
Temperature Stability
Long Term Stability
1000 hrs T
a
= 125
o
C
I
O
= 0 mA
I
O
= 0 to 1.5 A
Test Conditions
T
j
= 25 C
V
IN
= 6.6 to 30 V
o
Min.
4.95
4.9
Typ.
5
5
0.5
1
5
10
1.3
5
Max.
5.05
5.1
10
10
20
35
1.5
10
Unit
V
V
mV
mV
mV
mV
V
mA
A
V
IN
= 6.6 to 20 V I
O
= 0 mA T
j
= 25
o
C
V
IN
= 6.6 to 20 V I
O
= 0 mA
I
O
= 0 to 1.5 A
I
O
= 0 to 1.5 A
I
O
= 1.5 A
V
IN
≤
30 V
V
IN
- V
O
= 5V
V
IN
- V
O
= 25V
T
a
= 25
o
C 30ms Pulse
I
O
= 1.5 A f = 120 Hz
V
IN
= 10
±
3V
C
O
= 25µF
60
1.5
0.05
T
j
= 25
o
C
2
0.2
0.01
75
0.003
0.5
0.5
0.04
%/W
dB
%
%
%
B = 10Hz to 10KHz T
a
= 25
o
C
Note1: See short-circuit curve for available output current at fixed dropout.
5/15
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