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LT1086 Series - 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
LT1086 Series
1.5A Low Dropout Positive
Regulators Adjustable and
Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
FEATURES
DESCRIPTIO
n
3-Terminal Adjustable or Fixed
2.85V, 3.3V, 3.6V, 5V, 12V
The LT ® 1086 is designed to provide up to 1.5A output
current. All internal circuitry is designed to operate down
to 1V input-to-output differential and the dropout voltage
is fully specified as a function of load current. Dropout is
guaranteed at several operating points up to a maximum
of 1.5V at maximum output current. Dropout decreases at
lower load currents. On-chip trimming adjusts the refer-
ence/ouput voltage to 1%. Current limit is also trimmed,
minimizing the stress on both the regulator and power
source circuitry under overload conditions.
The LT1086 is pin compatible with older 3-terminal adjust-
able regulators. A minimum 10
n
Output Current of 1.5A (0.5A for LT1086H)
Operates Down to 1V Dropout
n
Guaranteed Dropout Voltage at Multiple Current Levels
n
n
Line Regulation: 0.015%
Load Regulation: 0.1%
n
100% Thermal Limit Functional Test
n
n
Ripple Rejection >75dB
Available in 3-Pin TO-220 and 3-Pin DD Packages
n
APPLICATIO U
m
F output capacitor is
required on these devices.
The LT1086 offers excellent line and load regulation speci-
fications and ripple rejection exceeds 75dB even at the
maximum load current of 1.5A. The LT1086 is floating
architecture with a composite NPN output stage. All of the
quiescent current and the drive current for the output
stage flows to the load increasing efficiency.
The LT1086 is available in a 3-pin TO-220 package and a
space-saving surface mountable 3-pin DD package.
n
SCSI-2 Active Terminator
High Efficiency Linear Regulators
n
n
Post Regulators for Switching Supplies
Constant Current Regulators
n
Battery Chargers
n
n
Microprocessor Supply
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LT1086 Dropout Voltage
2
5V to 3.3V Regulator
INDICATES GUARANTEED TEST POINT
V IN ³ 4.75V
IN
LT1086-3.3
OUT
3.3V AT 1.5A
–55 ° C £ T J £ 150 ° C
0 ° C £ T J £ 125 ° C
GND
F*
TANTALUM
µ
F
TANTALUM
µ
1
T J = – 55
°
C
T J = 150
°
°
C
LT1086 • TA01
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
0
0
0.5
1
1.5
OUTPUT CURRENT (A)
LT1086 • TA02
sn1086 1086ffs
1
10
10
C
T J = 25
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LT1086 Series
ABSOLUTE M AXI M U M RATINGS
(Note 1)
Power Dissipation ............................... Internally Limited
Input Voltage* ......................................................... 30V
Operating Input Voltage
Adjustable Devices ........................................... 25V
2.85V Devices .................................................. 18V
3.3V, 3.6V, and 5V Devices ............................... 20V
12V Devices ...................................................... 25V
Operating Junction Temperature Range
“C” Grades
Control Section ............................... 0
“M” Grades
Control Section .......................... – 55
°
C to 150
°
C
Power Transistor ........................ – 55
°
C to 200
°
C
Storage Temperature Range ................. – 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec) .................. 300
°
C
°
C to 125
°
C
* Although the device’s maximum operating voltage is limited, (18V for a
2.85V device, 20V for a 5V device, and 25V for adjustable and12V devices) the
devices are guaranteed to withstand transient input voltages up to 30V. For
input voltages greater than the maximum operating input voltage some
degradation of specifications will occur. For fixed voltage devices operating at
input/output voltage differentials greater than 15V, a minimum external load
of 5mA is required to maintain regulation.
Power Transistor ............................. 0
°
C to 150
°
C
“I” Grades
Control Section .......................... – 40
°
C to 125
°
C
PRECO N DITIO N I N G
Power Transistor ........................ – 40
°
C to 150
°
C
100% Thermal Shutdown Functional Test.
PACKAGE/ORDER I N FOR M ATIO N
ORDER
PART NUMBER
FRONT VIEW
ORDER
PART NUMBER
BOTTOM VIEW
3
V IN
V OUT
ADJ
(GND) †
ADJ
TAB IS
OUTPUT
LT1086CH
LT1086MH
2
LT1086CM
LT1086CM-3.3
LT1086CM-3.6
LT1086IM
LT1086IM-3.3
2
1
V IN
13
V OUT
(CASE)
M PACKAGE
3-LEAD PLASTIC DD
H PACKAGE
3-LEAD TO-39 METAL CAN
q JA = 30 ° C/W**
** WITH PACKAGE SOLDERED TO 0.5IN 2 COPPER AREA
OVER BACKSIDE GROUND PLANE OR INTERNAL POWER
PLANE. q JA CAN VARY FROM 20 ° C/W TO > 40 ° C/W
DEPENDING ON MOUNTING TECHNIQUE.
q JA = 150 ° C/W
BOTTOM VIEW
ORDER
PART NUMBER
ORDER
PART NUMBER
V IN
CASE
IS OUTPUT
LT1086CK
LT1086CK-5
LT1086CK-12
LT1086IK
LT1086IK-5
LT1086IK-12
LT1086MK
LT1086MK-5
LT1086MK-12
FRONT VIEW
LT1086CT
LT1086CT-2.85
LT1086CT-3.3
LT1086IT
LT1086IT-5
LT1086IT-12
LT1086CT-3.6
LT1086CT-5
LT1086CT-12
2
3
2
V IN
V OUT
ADJ
(GND) †
TAB IS
OUTPUT
1
1
ADJ (GND)*
T PACKAGE
3-LEAD PLASTIC TO-220
K PACKAGE
2-LEAD TO-3 METAL CAN
q JA = 50
°
C/W
q JA = 35 ° C/W
OBSOLETE PACKAGES
Consider the T Package for Alternate Source
† For fixed versions.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
sn1086 1086ffs
2
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LT1086 Series
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25
°
C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage LT1086, LT1086H I OUT = 10mA, T J = 25 ° C, (V IN – V OUT ) = 3V
1.238 1.250 1.262
V
(Note 3)
10mA £ I OUT £ 1.5A, (0.5A for LT1086H), 1.5V £ (V IN – V OUT ) £ 15V
l
1.225 1.250 1.270
V
Output Voltage
LT1086-2.85
I OUT = 0mA, T J = 25 ° C, V IN = 5V
2.82
2.85
2.88
V
(Note 3)
0V £ I OUT £ 1.5A, 4.35V £ V IN £ 18V
l
2.79
2.85
2.91
V
LT1086-3.3
V IN = 5V, I OUT = 0mA, T J = 25
°
C
3.267 3.300 3.333
V
4.75V
£
V IN
£
18V, 0V
£
I OUT
£
1.5A
l
3.235 3.300 3.365
V
LT1086-3.6
V IN = 5V, I OUT = 0mA, T J = 25 ° C
3.564 3.600 3.636
V
5V £ V IN £ 18V, 0 £ I OUT £ 1.5A
l
3.500
3.672
V
4.75V £ V IN £ 18V, 0 £ I OUT £ 1A, T J ³ 0 ° C
3.500
3.672
V
V IN = 4.75V, I OUT = 1.5A, T J ³ 0 ° C
3.300
3.672
V
LT1086-5
I OUT = 0mA, T J = 25 ° C, V IN = 8V
4.950 5.000 5.050
V
0
£
I OUT
£
1.5A, 6.5V
£
V IN
£
20V
l
4.900 5.000 5.100
V
LT1086-12
I OUT = 0mA, T J = 25
°
C, V IN = 15V
11.880 12.000 12.120
V
0
£
I OUT
£
1.5A, 13.5V
£
V IN
£
25V
l
11.760 12.000 12.240
V
Line Regulation
LT1086, LT1086H I LOAD = 10mA, 1.5V £ (V IN – V OUT ) £ 15V, T J = 25 ° C
0.015
0.2
%
l
0.035
0.2
%
LT1086-2.85
I OUT = 0mA, T J = 25
°
C, 4.35V
£
V IN
£
18V
0.3
6
mV
l
0.6
6
mV
LT1086-3.3
4.5V
£
V IN
£
18V, I OUT = 0mA, T J = 25
°
C
0.5
10
mV
l
1.0
10
mV
LT1086-3.6
4.75V £ V IN £ 18V, I OUT = 0mA, T J = 25 ° C
0.5
10
mV
l
1.0
10
mV
LT1086-5
I OUT = 0mA, T J = 25
°
C, 6.5V
£
V IN
£
20V
0.5
10
mV
l
1.0
10
mV
LT1086-12
I OUT = 0mA, T J = 25
°
C, 13.5V
£
V IN
£
25V
1.0
25
mV
l
2.0
25
mV
Load Regulation
LT1086, LT1086H (V IN – V OUT ) = 3V, 10mA £ I OUT £ 1.5A, (0.5A for LT1086H)
T J = 25 ° C (Notes 2, 3)
0.1
0.3
%
l
0.2
0.4
%
LT1086-2.85
V IN = 5V, 0
£
I OUT
£
1.5A, T J = 25
°
C (Notes 2, 3)
3
12
mV
l
6
20
V
LT1086-3.3
V IN = 5V, 0 £ I OUT £ 1.5A, T J = 25 ° C (Notes 2, 3)
3
15
mV
l
7
25
V
LT1086-3.6
V IN = 5.25V, 0 £ I OUT £ 1.5A, T J = 25 ° C (Notes 2, 3)
3
15
mV
l
6
25
V
V IN = 5V, 0 £ I OUT £ 1A, T J = 25 ° C
2
15
mV
l
4
25
V
LT1086-5
V IN = 8V, 0
£
I OUT
£
1.5A, T J = 25
°
C (Notes 2, 3)
5
20
mV
l
10
35
mV
LT1086-12
V IN = 15V, 0 £ I OUT £ 1.5A, T J = 25 ° C (Notes 2, 3)
12
36
mV
l
24
72
mV
Dropout Voltage
LT1086/-2.85/-3.3/-3.6/-5/-12 D V OUT , D V REF = 1%, I OUT = 1.5A (Note 4)
l
1.3
1.5
V
(V IN – V OUT )
LT1086H
D
V REF = 1%, I OUT = 0.5A (Note 4)
l
0.95
1.25
V
sn1086 1086ffs
3
23709863.033.png
LT1086 Series
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25
°
C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Limit
LT1086/-2.85/-3.3/-3.6/-5/-12 (V IN – V OUT ) = 5V
l
1.50
2.00
A
(V IN – V OUT ) = 25V
l
0.05
0.15
A
LT1086H
(V IN – V OUT ) = 5V
l
0.50 0.700
A
(V IN – V OUT ) = 25V
l
0.02 0.075
A
Minimum Load Current LT1086/LT1086H
(V IN – V OUT ) = 25V (Note 5)
l
5
10
A
Quiescient Current
LT1086-2.85
V IN £ 18V
l
5
10
A
LT1086-3.3
V IN
£
18V
l
5
10
A
LT1086-3.6
V IN
£
18V
l
5
10
A
LT1086-5
V IN £ 20V
l
5
10
A
LT1086-12
V IN
£
25V
l
5
10
A
Thermal Regulation
T A = 25 ° C, 30ms pulse
0.008 0.04
%/W
Ripple Rejection
f = 120Hz, C OUT = 25
m
F Tantalum, I OUT = 1.5A, (I OUT = 0.5A for LT1086H)
LT1086, LT1086H
C ADJ = 25
m
F, (V IN – V OUT ) = 3V
l
60
75
dB
LT1086-2.85
V IN = 6V
l
60
72
dB
LT1086-3.3
V IN = 6.3V
l
60
72
dB
LT1086-3.6
V IN = 6.6V
l
60
72
dB
LT1086-5
V IN = 8V
l
60
68
dB
LT1083-12
V IN = 15V
l
54
60
dB
Adjust Pin Current
LT1086, LT1086H
T J = 25 ° C
55
m A
l
120
m A
Adjust Pin Current
LT1086, LT1086H
10mA £ I OUT £ 1.5A (0.5A for LT1086H)
Change
1.5V £ (V IN – V OUT ) £ 15V
l
0.2
5
m A
Temperature Stability
l
0.5
%
Long-Term Stability
T A = 125 ° C, 1000 Hrs.
0.3
1
%
RMS Output Noise
T A = 25 ° C, 10Hz = £ f £ 10kHz
0.003
%
(% of V OUT )
Thermal Resistance
H Package: Control Circuitry/Power Transistor
15/20
°
C/W
Junction-to-Case
K Package: Control Circuitry/Power Transistor
1.7/4.0
°
C/W
M Package: Control Circuitry/Power Transistor
1.5/4.0
°
C/W
T Package: Control Circuitry/Power Transistor
1.5/4.0
°
C/W
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: See Thermal Regulation specifications for changes in output
voltage due to heating effects. Line and load regulation are measured at a
constant junction temperature by low duty cycle pulse testing. Load
regulation is measured at the output lead
»
by the input/output differential and the output current. Guaranteed
maximum power dissipation will not be available over the full input/output
range. See Short-Circuit Current curve for available output current.
Note 4: Dropout voltage is specified over the full output current range of
the device. Test points and limits are shown on the Dropout Voltage curve.
Note 5: Minimum load current is defined as the minimum output current
required to maintain regulation. At 25V input/output differential the device
is guaranteed to regulate if the output current is greater than 10mA.
sn1086 1086ffs
4
1/8" from the package.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissipation of 15W (3W for the LT1086H). Power dissipation is determined
23709863.034.png 23709863.035.png
LT1086 Series
TYPICAL PERFOR M A N CE CHARACTERISTICS
LT1086 Short-Circuit Current
LT1086 Load Regulation
Minimum Operating Current
(Adjustable Device)
2.5
0.10
10
D I = 1.5A
9
T J = 150
°
0.05
2.0
8
C
T J = –55
°
7
°
C
0
1.5
6
–0.05
5
T J = 150 ° C
T J = 25 ° C
T J = –55 ° C
1.0
4
–0.10
3
0.5
GUARANTEED
OUTPUT CURRENT
–0.15
2
1
0
–0.20
0
0
5
10
15
20
25
30
–50
–25
0
25
50
75
100
125
150
0
5
10
15
20
25
30
35
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (
°
C)
INPUT/OUTPUT DIFFERENTIAL (V)
LT1086 • TPC01
LT1086 • TPC02
LT1086 • TPC03
Temperature Stability
Adjust Pin Current
LT1086 Maximum Power
Dissipation*
2
100
20
90
80
LT1086MK
1
15
70
60
LT1086CT
0
50
10
LT1086CK
40
30
–1
20
5
10
–2
0
0
–50
–25
0
25
50
75
100
125
150
–50
–25
0
25
50 75
100 125 150
50
60
70
80
90
100
110
120
130
140
150
TEMPERATURE (
°
C)
TEMPERATURE (
°
C)
CASE TEMPERATURE ( ° C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1086 • TPC04
LT1086 • TPC05
LT1086 • TPC06
LT1086 Ripple Rejection
LT1086 Ripple Rejection
vs Current
LT1086-5 Ripple Rejection
100
100
80
V RIPPLE £ 3V P-P
V RIP PLE £ 0.5V P-P
V RIPPLE
£
3V P-P
V RI PPLE
£
0.5V P-P
f R = 120Hz
V RIPPLE
90
90
£
3V P-P
70
80
(V IN – V OUT )
³
3V
80
(V IN – V OUT ) ³ 3V
60
70
70
f R = 20kHz
V RIPPLE
£
0.5V P-P
60
60
50
(V IN – V OUT )
³
V DROPOUT
(V IN – V OUT ) ³ V DROPOUT
50
50
40
40
40
30
30
30
20
20
C ADJ = 200
m
F AT FREQUENCIES < 60Hz
20
V OUT = 5V
C ADJ = 25 m F
C OUT = 25 m F
C ADJ = 25
m
F AT FREQUENCIES > 60Hz
10
10
10
I OUT = 1.5A
I OUT = 1.5A
0
0
0
10
100
1k
10k
100k
0
0.25
0.5
0.75
1.0
1.25
1.5
10
100
1k
10k
100k
FREQUENCY (Hz)
OUTPUT CURRENT (A)
FREQUENCY (Hz)
LT1086 • TPC07
LT1086 • TPC08
LT1086 • TPC09
sn1086 1086ffs
5
C
T J = 25
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