LT1086CM#TRPBF [Linear]
LT1086 - 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V; Package: DD PAK; Pins: 3; Temperature Range: 0°C to 70°C;型号: | LT1086CM#TRPBF |
厂家: | Linear |
描述: | LT1086 - 1.5A Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 3.6V, 5V, 12V; Package: DD PAK; Pins: 3; Temperature Range: 0°C to 70°C 输出元件 调节器 |
文件: | 总16页 (文件大小:241K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1086 Series
1.5A Low Dropout Positive
Regulators Adjustable and
Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
U
FEATURES
DESCRIPTIO
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
■
3-Terminal Adjustable or Fixed
2.85V, 3.3V, 3.6V, 5V, 12V
■
Output Current of 1.5A (0.5A for LT1086H)
■
Operates Down to 1V Dropout
■
Guaranteed Dropout Voltage at Multiple Current Levels guaranteed at several operating points up to a maximum
■
■
■
■
■
Line Regulation: 0.015%
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.
Load Regulation: 0.1%
100% Thermal Limit Functional Test
Ripple Rejection >75dB
Available in 3-Pin TO-220 and 3-Pin DD Packages
TheLT1086ispincompatiblewitholder3-terminaladjust-
able regulators. A minimum 10µF output capacitor is
required on these devices.
U
APPLICATIO S
■
SCSI-2 Active Terminator
TheLT1086offersexcellentlineandloadregulationspeci-
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.
■
High Efficiency Linear Regulators
■
Post Regulators for Switching Supplies
■
Constant Current Regulators
Battery Chargers
Microprocessor Supply
■
■
The LT1086 is available in a 3-pin TO-220 package and a
space-saving surface mountable 3-pin DD package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
LT1086 Dropout Voltage
2
INDICATES GUARANTEED TEST POINT
5V to 3.3V Regulator
–55°C ≤ T ≤ 150°C
J
0°C ≤ T ≤ 125°C
J
V
≥ 4.75V
3.3V AT 1.5A
IN LT1086-3.3 OUT
GND
IN
1
0
10µF*
10µF
TANTALUM
T
J
T
J
T
J
= –55°C
= 25°C
TANTALUM
= 150°C
LT1086 • TA01
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
0
0.5
1
1.5
OUTPUT CURRENT (A)
LT1086 • TA02
sn1086 1086ffs
1
LT1086 Series
ABSOLUTE MAXIMUM RATINGS
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
W W
U W
(Note 1)
“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
* 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
Control Section ............................... 0°C to 125°C
Power Transistor............................. 0°C to 150°C
“I” Grades
of 5mA is requiredU to maintain reguU latioU n.
Control Section .......................... –40°C to 125°C
Power Transistor........................ –40°C to 150°C
PRECONDITIONING
100% Thermal Shutdown Functional Test.
U
W U
PACKAGE/ORDER INFORMATION
FRONT VIEW
ORDER
ORDER
BOTTOM VIEW
PART NUMBER
PART NUMBER
3
2
1
V
V
IN
ADJ
TAB IS
OUTPUT
OUT
LT1086CM
LT1086CH
LT1086MH
2
ADJ
V
IN
1
3
V
OUT
(CASE)
(GND)†
LT1086CM-3.3
LT1086CM-3.6
LT1086IM
M PACKAGE
3-LEAD PLASTIC DD
θJA = 30°C/W**
H PACKAGE
3-LEAD TO-39 METAL CAN
** WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA
OVERBACKSIDEGROUNDPLANEORINTERNALPOWER
PLANE. θJA CAN VARY FROM 20°C/W TO >40°C/W
DEPENDING ON MOUNTING TECHNIQUE.
LT1086IM-3.3
θJA = 150°C/W
ORDER
PART NUMBER
ORDER
PART NUMBER
BOTTOM VIEW
CASE
IS OUTPUT
FRONT VIEW
V
IN
LT1086CK
LT1086CT
2
1
LT1086CK-5
LT1086CK-12
LT1086IK
3
2
1
V
V
LT1086CT-2.85
LT1086CT-3.3
LT1086IT
IN
TAB IS
OUTPUT
OUT
ADJ
(GND)†
LT1086IK-5
LT1086IK-12
LT1086MK
LT1086MK-5
LT1086MK-12
ADJ (GND)*
LT1086IT-5
LT1086IT-12
LT1086CT-3.6
LT1086CT-5
LT1086CT-12
T PACKAGE
3-LEAD PLASTIC TO-220
K PACKAGE
2-LEAD TO-3 METAL CAN
θJA = 50°C/W
θJA = 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
LT1086 Series
The ● denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage LT1086, LT1086H
(Note 3)
I
= 10mA, T = 25°C, (V – V ) = 3V
1.238 1.250 1.262
1.225 1.250 1.270
V
V
OUT
J
IN
OUT
10mA ≤ I
≤ 1.5A, (0.5A for LT1086H), 1.5V ≤ (V – V ) ≤ 15V
●
●
●
●
OUT
IN
OUT
Output Voltage
(Note 3)
LT1086-2.85
LT1086-3.3
LT1086-3.6
I
= 0mA, T = 25°C, V = 5V
2.82
2.79
2.85
2.85
2.88
2.91
V
V
OUT
J
IN
0V ≤ I
≤ 1.5A, 4.35V ≤ V ≤ 18V
OUT
IN
V
= 5V, I
= 0mA, T = 25°C
3.267 3.300 3.333
3.235 3.300 3.365
V
V
IN
OUT
J
4.75V ≤ V ≤ 18V, 0V ≤ I
≤ 1.5A
IN
OUT
V
= 5V, I
IN
= 0mA, T = 25°C
3.564 3.600 3.636
V
V
V
V
IN
OUT
J
5V ≤ V ≤ 18V, 0 ≤ I
4.75V ≤ V ≤ 18V, 0 ≤ I
V
≤ 1.5A
3.500
3.500
3.300
3.672
3.672
3.672
OUT
≤ 1A, T ≥ 0°C
J
= 1.5A, T ≥ 0°C
IN
OUT
= 4.75V, I
IN
OUT J
LT1086-5
I
= 0mA, T = 25°C, V = 8V
4.950 5.000 5.050
4.900 5.000 5.100
V
V
OUT
J
IN
0 ≤ I
≤ 1.5A, 6.5V ≤ V ≤ 20V
●
●
●
●
●
●
●
●
OUT
IN
LT1086-12
LT1086, LT1086H
LT1086-2.85
LT1086-3.3
LT1086-3.6
LT1086-5
I
= 0mA, T = 25°C, V = 15V
11.880 12.000 12.120
11.760 12.000 12.240
V
V
OUT
J
IN
0 ≤ I
≤ 1.5A, 13.5V ≤ V ≤ 25V
OUT
IN
Line Regulation
I
I
= 10mA, 1.5V ≤ (V – V ) ≤ 15V, T = 25°C
0.015
0.035
0.2
0.2
%
%
LOAD
IN
OUT
J
= 0mA, T = 25°C, 4.35V ≤ V ≤ 18V
0.3
0.6
6
6
mV
mV
OUT
J
IN
4.5V ≤ V ≤ 18V, I
= 0mA, T = 25°C
0.5
1.0
10
10
mV
mV
IN
OUT
J
4.75V ≤ V ≤ 18V, I
= 0mA, T = 25°C
0.5
1.0
10
10
mV
mV
IN
OUT
J
I
I
= 0mA, T = 25°C, 6.5V ≤ V ≤ 20V
0.5
1.0
10
10
mV
mV
OUT
OUT
J
IN
LT1086-12
= 0mA, T = 25°C, 13.5V ≤ V ≤ 25V
1.0
2.0
25
25
mV
mV
J
IN
Load Regulation
LT1086, LT1086H (V – V ) = 3V, 10mA ≤ I
≤ 1.5A, (0.5A for LT1086H)
OUT
IN
OUT
T = 25°C (Notes 2, 3)
J
0.1
0.2
0.3
0.4
%
%
●
●
●
LT1086-2.85
LT1086-3.3
LT1086-3.6
V
V
= 5V, 0 ≤ I
= 5V, 0 ≤ I
≤ 1.5A, T = 25°C (Notes 2, 3)
3
6
12
20
mV
mV
IN
IN
OUT
OUT
J
≤ 1.5A, T = 25°C (Notes 2, 3)
3
7
15
25
mV
mV
J
V
V
= 5.25V, 0 ≤ I
≤ 1.5A, T = 25°C (Notes 2, 3)
3
6
2
4
15
25
15
25
mV
mV
mV
mV
IN
IN
OUT
J
●
●
= 5V, 0 ≤ I
= 8V, 0 ≤ I
≤ 1A, T = 25°C
J
OUT
OUT
LT1086-5
V
V
≤ 1.5A, T = 25°C (Notes 2, 3)
5
10
20
35
mV
mV
IN
IN
J
●
LT1086-12
= 15V, 0 ≤ I
≤ 1.5A, T = 25°C (Notes 2, 3)
12
24
36
72
mV
mV
OUT
J
●
●
Dropout Voltage
LT1086/-2.85/-3.3/-3.6/-5/-12 ∆V , ∆V = 1%, I
= 1.5A (Note 4)
1.3
1.5
V
OUT
OUT
REF
OUT
(V – V
)
IN
OUT
LT1086H
∆V = 1%, I
REF
= 0.5A (Note 4)
●
0.95
1.25
V
sn1086 1086ffs
3
LT1086 Series
The ● denotes the specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
LT1086/-2.85/-3.3/-3.6/-5/-12 (V – V ) = 5V
MIN
TYP
MAX
UNITS
Current Limit
●
●
1.50
0.05
2.00
0.15
A
A
IN
OUT
(V – V ) = 25V
IN
OUT
LT1086H
(V – V ) = 5V
●
●
0.50
0.02
0.700
0.075
A
A
IN
OUT
(V – V ) = 25V
IN
OUT
Minimum Load Current LT1086/LT1086H
(V – V ) = 25V (Note 5)
●
5
10
mA
IN
OUT
Quiescient Current
LT1086-2.85
LT1086-3.3
LT1086-3.6
LT1086-5
V
V
V
V
V
≤ 18V
●
●
●
●
●
5
5
5
5
5
10
10
10
10
10
mA
mA
mA
mA
mA
IN
IN
IN
IN
IN
≤ 18V
≤ 18V
≤ 20V
≤ 25V
LT1086-12
Thermal Regulation
Ripple Rejection
T = 25°C, 30ms pulse
0.008 0.04
%/W
A
f = 120Hz, C
= 25µF Tantalum, I
= 1.5A, (I
= 0.5A for LT1086H)
OUT
OUT
OUT
LT1086, LT1086H
LT1086-2.85
LT1086-3.3
LT1086-3.6
LT1086-5
C
V
V
V
V
V
= 25µF, (V – V ) = 3V
●
●
●
●
●
●
60
60
60
60
60
54
75
72
72
72
68
60
dB
dB
dB
dB
dB
dB
ADJ
IN
OUT
= 6V
IN
IN
IN
IN
IN
= 6.3V
= 6.6V
= 8V
LT1083-12
= 15V
Adjust Pin Current
LT1086, LT1086H
T = 25°C
J
55
µA
µA
●
120
Adjust Pin Current
Change
LT1086, LT1086H
10mA ≤ I
1.5V ≤ (V – V ) ≤ 15V
≤ 1.5A (0.5A for LT1086H)
OUT
●
●
0.2
0.5
5
1
µA
%
%
%
IN
OUT
Temperature Stability
Long-Term Stability
RMS Output Noise
T = 125°C, 1000 Hrs.
A
0.3
T = 25°C, 10Hz = ≤ f ≤ 10kHz
A
0.003
(% of V
)
OUT
Thermal Resistance
Junction-to-Case
H Package: Control Circuitry/Power Transistor
K Package: Control Circuitry/Power Transistor
M Package: Control Circuitry/Power Transistor
T Package: Control Circuitry/Power Transistor
15/20
1.7/4.0
1.5/4.0
1.5/4.0
°C/W
°C/W
°C/W
°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 ≈1/8" from the package.
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.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissipation of 15W (3W for the LT1086H). Power dissipation is determined
sn1086 1086ffs
4
LT1086 Series
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Operating Current
(Adjustable Device)
LT1086 Short-Circuit Current
LT1086 Load Regulation
10
9
8
7
6
5
4
3
2
1
0
2.5
2.0
1.5
1.0
0.10
0.05
∆I = 1.5A
T
= 150°C
J
T
T
= 25°C
= –55°C
J
J
0
T
= 150°C
–0.05
–0.10
–0.15
–0.20
J
T
= 25°C
J
T
= –55°C
J
0.5
0
GUARANTEED
OUTPUT CURRENT
0
10
15
20
25
30
–50 –25
0
25 50 75 100 125 150
20
35
5
0
10
15
25
30
5
INPUT/OUTPUT DIFFERENTIAL (V)
TEMPERATURE (°C)
INPUT/OUTPUT DIFFERENTIAL (V)
LT1086 • TPC01
LT1086 • TPC02
LT1086 • TPC03
LT1086 Maximum Power
Dissipation*
Temperature Stability
Adjust Pin Current
100
90
80
70
60
50
40
30
20
10
0
20
2
1
LT1086MK
15
10
5
LT1086CT
LT1086CK
0
–1
–2
0
–50
50
100 125
150
–25
0
25
75
50 75
TEMPERATURE (°C)
–50 –25
0
25
100 125 150
50 60 70 80 90 100 110 120 130 140 150
TEMPERATURE (°C)
CASE TEMPERATURE (°C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1086 • TPC05
LT1086 • TPC04
LT1086 • TPC06
LT1086 Ripple Rejection
vs Current
LT1086 Ripple Rejection
LT1086-5 Ripple Rejection
100
90
80
70
60
50
40
30
20
10
0
80
100
90
V
≤ 3V
V
≤ 0.5V
RIPPLE
P-P RIPPLE P-P
f
= 120Hz
RIPPLE
R
V
≤ 3V
V
≤ 0.5V
RIPPLE P-P
RIPPLE
P-P
70
60
50
40
30
20
10
0
V
≤ 3V
P-P
(V – V ) ≥ 3V
IN
OUT
80
70
60
(V – V ) ≥ 3V
IN
OUT
f
= 20kHz
RIPPLE
R
V
≤ 0.5V
P-P
(V – V ) ≥ V
(V – V ) ≥ V
IN
OUT
DROPOUT
IN
OUT
DROPOUT
50
40
30
20
10
0
C
C
= 200µF AT FREQUENCIES < 60Hz
= 25µF AT FREQUENCIES > 60Hz
= 1.5A
ADJ
ADJ
OUT
V
OUT
C
ADJ
C
OUT
= 5V
= 25µF
= 25µF
I
I
= 1.5A
100
OUT
10
100
1k
10k
100k
10
1k
10k
100k
0
0.25
0.75
1.0
1.25
1.5
0.5
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT CURRENT (A)
LT1086 • TPC09
LT1086 • TPC07
LT1086 • TPC08
sn1086 1086ffs
5
LT1086 Series
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
LT1086-5 Ripple Rejection
vs Current
LT1086-12 Ripple Rejection
vs Current
LT1086-12 Ripple Rejection
100
90
80
70
60
50
40
30
20
10
0
100
90
V
≤ 3V
V
≤ 0.5V
RIPPLE
P-P RIPPLE P-P
f
= 120Hz
RIPPLE
R
80
70
60
80
70
60
V
≤ 3V
P-P
f = 120Hz
R
(V – V ) ≥ 3V
V
≤ 3V
P-P
IN
OUT
RIPPLE
f
V
= 20kHz
R
≤ 0.5V
RIPPLE
P-P
f
= 20kHz
RIPPLE
50
40
R
50
40
V
≤ 0.5V
(V – V ) ≥ V
P-P
IN
OUT
DROPOUT
30
20
10
0
30
20
10
0
V
C
C
= 5V
= 25µF
= 25µF
OUT
ADJ
OUT
V
OUT
C
ADJ
C
OUT
= 5V
= 25µF
= 25µF
I
= 1.5A
100
OUT
0
0.25
0.75
1.0
1.25
1.5
0.5
10
1k
10k
100k
0
0.25
0.75
1.0
1.25
1.5
0.5
OUTPUT CURRENT (A)
FREQUENCY (Hz)
OUTPUT CURRENT (A)
LT1086 • TPC11
LT1086 • TPC10
LT1086 • TPC12
LT1086 Line Transient Response
LT1086 Load Transient Response
LT1086H Short-Circuit Current
1.2
1.0
0.3
0.2
0.1
0
60
40
C
ADJ
= 0
20
C
ADJ
= 1µF
0
0.8
0.6
–0.1
–0.2
–0.3
1.5
1.0
0.5
0
C
ADJ
= 1µF
–20
–40
–60
14
C
ADJ
= 0
V
= 10V
OUT
OUT
IN
C
C
= 1µF TANTALUM
OUT
IN
I
= 0.2A
= 10µF TANTALUM
C
C
= 1µF TANTALUM
= 10µF TANTALUM
0.4
0.2
0
V
IN
= 10V
OUT
OUT
V
= 13V
13
PRELOAD = 100mA
GUARANTEED
OUTPUT CURRENT
12
11
0
5
10
15
20
25
0
50
TIME (µs)
100
0
100
200
INPUT/OUTPUT DIFFERENTIAL (V)
TIME (µs)
LT1086 • TPC15
LT1086 • TPC14
LT1086 • TPC13
LT1086H Ripple Rejection
vs Current
LT1086H Dropout Voltage
LT1086H Load Regulation
0.10
0.05
2
1
0
100
90
INDICATES GUARANTEED TEST POINT
∆I = 0.5A
f
= 120Hz
RIPPLE
80
70
60
R
V
≤ 3V
–55°C ≤ T ≤ 150°C
P-P
J
0
0°C ≤ T ≤ 125°C
J
f
= 20kHz
RIPPLE
R
–0.05
–0.10
–0.15
–0.20
50
40
V
≤ 0.5V
P-P
T
= –55°C
J
30
20
10
0
T
J
= 25°C
J
T
= 150°C
V
OUT
C
ADJ
C
OUT
= 5V
= 25µF
= 25µF
75 100
–50 –25
0
25 50
125 150
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.3
OUTPUT CURRENT (A)
0.4
0.5
0.2
TEMPERATURE (°C)
OUTPUT CURRENT (A)
LT1086 • TPC17
LT1086 • TPC16
LT1086 • TPC18
sn1086 1086ffs
6
LT1086 Series
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
LT1086H Maximum Power
Dissipation*
LT1086H Ripple Rejection
100
90
80
70
60
50
40
30
20
10
0
5
4
3
2
1
0
V
≤ 3V
V
≤ 0.5V
RIPPLE
P-P RIPPLE P-P
(V – V ) ≥ 3V
IN
OUT
(V – V ) ≥ V
IN
OUT
DROPOUT
LT1086MH
C
C
I
= 200µF AT FREQUENCIES < 60Hz
= 25µF AT FREQUENCIES > 60Hz
= 0.5A
ADJ
ADJ
OUT
10
100
1k
10k
100k
50 60 70 80 90 100 110 120 130 140 150
FREQUENCY (Hz)
CASE TEMPERATURE (°C)
LT1086 • TPC19
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1086 • TPC20
W
BLOCK DIAGRAM
V
IN
+
–
THERMAL
LIMIT
1086 • BD
V
OUT
V
ADJ
sn1086 1086ffs
7
LT1086 Series
U
W U U
APPLICATIONS INFORMATION
The LT1086 family of 3-terminal regulators is easy to use
andhasalltheprotectionfeaturesthatareexpectedinhigh
performance voltage regulators. They are short-circuit
protected and have safe area protection as well as thermal
shutdown to turn off the regulator should the temperature
exceed about 165°C at the sense point.
response with heavy load current changes. Output capaci-
tance can be increased without limit and larger values of
output capacitor further improve stability and transient
response of the LT1086 regulators.
Anotherpossiblestabilityproblemthatcanoccurinmono-
lithic IC regulators is current limit oscillations. These can
occur because in current limit, the safe area protection
exhibits a negative impedance. The safe area protection
decreases the current limit as the input-to-output voltage
increases.That is the equivalent of having a negitive resis-
tancesinceincreasingvoltagecausescurrenttodecrease.
Negative resistance during current limit is not unique to
the LT1086 series and has been present on all power IC
regulators. Thevalueofnegativeresistanceisafunctionof
how fast the current limit is folded back as input-to-output
voltage increases. This negative resistance can react with
capacitors or inductors on the input to cause oscillation
during current limiting. Depending on the value of series
resistance,theoverallcircuitrymayendupunstable.Since
thisisasystemproblem, itisnotnecessarilyeasytosolve;
however, it does not cause any problems with the IC
regulator and can usually be ignored.
These regulators are pin compatible with older 3-terminal
adjustable devices, offer lower dropout voltage and more
precise reference tolerance. Further, the reference stabil-
ity with temperature is improved over older types of
regulators. The only circuit difference between using the
LT1086 family and older regulators is that they require an
output capacitor for stability.
Stability
The circuit design used in the LT1086 family requires the
use of an output capacitor as part of the device frequency
compensation.Foralloperatingconditions,theadditionof
150µF aluminum electrolytic or a 22µF solid tantalum on
the output will ensure stability. Normally capacitors much
smaller than this can be used with the LT1086. Many
different types of capacitors with widely varying charac-
teristics are available. These capacitors differ in capacitor
tolerance (sometimes ranging up to ±100%), equivalent
series resistance, and capacitance temperature coeffi-
cient. The 150µF or 22µF values given will ensure stability.
Protection Diodes
In normal operation the LT1086 family does not need any
protection diodes. Older adjustable regulators required
protection diodes between the adjustment pin and the
output and from the output to the input to prevent over-
stressingthedie. TheinternalcurrentpathsontheLT1086
adjustment pin are limited by internal resistors. Therefore,
even with capacitors on the adjustment pin, no protection
diodeisneededtoensuredevicesafetyundershort-circuit
conditions.
When using the LT1086 the adjustment terminal can be
bypassed to improve ripple rejection. When the adjust-
ment terminal is bypassed the requirement for an output
capacitorincreases. Thevaluesof22µFtantalumor150µF
aluminum cover all cases of bypassing the adjustment
terminal. For fixed voltage devices or adjustable devices
without an adjust pin bypass capacitor, smaller output
capacitorscanbeusedwithequallygoodresults.Thetable
belowshowsapproximatelywhatsizecapacitorsareneeded
to ensure stability.
Diodes between input and output are usually not needed.
The internal diode between the input and the output pins
of the LT1086 family can handle microsecond surge
currents of 10A to 20A. Even with large output capaci-
tances, it is very difficult to get those values of surge
currents in normal operation. Only with high value output
capacitors such as 1000µF to 5000µF, and with the input
pininstantaneouslyshortedtoground,candamageoccur.
A crowbar circuit at the input of the LT1086 can generate
those kinds of currents and a diode from output to input is
Recommended Capacitor Values
INPUT
10µF
OUTPUT
ADJUSTMENT
None
10µF Tantalum, 50µF Aluminum
22µF Tantalum, 150µF Aluminum
10µF
20µF
Normally, capacitor values on the order of 100µF are used
in the output of many regulators to ensure good transient
then recommended. Normal power supply cycling or even
sn1086 1086ffs
8
LT1086 Series
U
W U U
APPLICATIONS INFORMATION
plugging and unplugging in the system will not generate
current large enough to do any damage.
the power supply may need to be cycled down to zero and
brought up again to make the output recover.
The adjustment pin can be driven on a transient basis
±25V, with respect to the output without any device
degradation. OfcourseaswithanyICregulator, exceeding
the maximum input-to-output voltage differential causes
the internal transistors to break down and none of the
protection circuitry is functional.
Ripple Rejection
For the LT1086 the typical curves for ripple rejection
reflect values for a bypassed adjust pin. This curve will be
true for all values of output voltage. For proper bypassing
and ripple rejection approaching the values shown, the
impedance of the adjust pin capacitor at the ripple fre-
quency should equal the value of R1, (normally 100Ω to
120Ω). The size of the required adjust pin capacitor is a
functionoftheinputripplefrequency. At120Hztheadjust
pin capacitor should be 13µF if R1 = 100Ω; at 10kHz only
0.16µF is needed.
D1
1N4002
(OPTIONAL)
V
IN
V
OUT
IN
LT1086 OUT
ADJ
+
C
R1
R2
OUT
150µF
For circuits without an adjust pin bypass capacitor the
ripple rejection will be a function of output voltage. The
output ripple will increase directly as a ratio of the output
voltage to the reference voltage (VOUT/VREF). For ex-
ample, with the output voltage equal to 5V and no adjust
pin capacitor, the output ripple will be higher by the ratio
of 5V/1.25V or four times larger. Ripple rejection will be
degraded by 12dB from the value shown on the LT1086
curve. Typical curves are provided for the 5V and 12V
devices since the adjust pin is not available.
+
C
ADJ
10µF
LT1086 • AI01
Overload Recovery
Like any of the IC power regulators, the LT1086 has safe
area protection. The safe area protection decreases the
current limit as input-to-output voltage increases and
keeps the power transistor inside a safe operating region
for all values of input-to-output voltage. The LT1086
protection is designed to provide some output current at
all values of input-to-output voltage up to the device
breakdown.
Output Voltage
The LT1086 develops a 1.25V reference voltage between
the output and the adjust terminal (see Figure 1). By
placing resistor R1 between these two terminals, a con-
stant current is caused to flow through R1 and down
throughR2tosettheoveralloutputvoltage.Normallythis
current is chosen to be the specified minimum load
current of 10mA. Because IADJ is very small and constant
when compared with the current through R1, it repre-
sents a small error and can usually be ignored. For fixed
voltage devices R1 and R2 are included in the device.
When power is first turned on, as the input voltage rises,
the output follows the input, allowing the regulator to start
up into very heavy loads. During the start-up, as the input
voltage is rising, the input-to-output voltage differential
remains small, allowing the regulator to supply large
output currents. With high input voltage, a problem can
occurwhereinremovalofanoutputshortwillnotallowthe
output voltage to recover. Older regulators such as the
7800 series also exhibited this phenomenon, so it is not
unique to the LT1086.
The problem occurs with a heavy output load when the
input voltage is high and the output voltage is low, such as
immediately after a removal of a short. The load line for
such a load may intersect the output current curve at two
points. If this happens there are two stable output operat-
ing points for the regulator. With this double intersection
IN
LT1086 OUT
ADJ
V
V
OUT
IN
+
10µF
V
R1
R2
REF
TANTALUM
I
ADJ
50µA
R2
R1
V
OUT
= V
1 +
+ I
ADJ
R2
REF
(
)
1086 • F01
Figure 1. Basic Adjustable Regulator
sn1086 1086ffs
9
LT1086 Series
U
W U U
APPLICATIONS INFORMATION
Load Regulation
Thermal Considerations
Because the LT1086 is a 3-terminal device, it is not
possible to provide true remote load sensing. Load regu-
lation will be limited by the resistance of the wire connect-
ing the regulator to the load. The data sheet specification
for load regulation is measured at the bottom of the
package. Negative side sensing is a true Kelvin connec-
tion, with the bottom of the output divider returned to the
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor divider R1 is connected directly to the
case not to the load, as illustrated in Figure 2. If R1 were
connectedtotheload, theeffectiveresistancebetweenthe
regulator and the load would be:
The LT1086 series of regulators have internal power and
thermal limiting circuitry designed to protect the device
under overload conditions. For continuous normal load
conditions however, maximum junction temperature rat-
ings must not be exceeded. It is important to give careful
consideration to all sources of thermal resistance from
junction to ambient. This includes junction-to-case, case-
to-heat sink interface and heat sink resistance itself. New
thermal resistance specifications have been developed to
more accurately reflect device temperature and ensure
safe operating temperatures. The data section for these
newregulatorsprovidesaseparatethermalresistanceand
maximum junction temperature for both the Control Sec-
tion and the Power Transistor. Previous regulators, with a
single junction-to-case thermal resistance specification,
used an average of the two values provided here and
therefore could allow excessive junction temperatures
under certain conditions of ambient temperature and heat
sink resistance. To avoid this possibility, calculations
should be made for both sections to ensure that both
thermal limits are met.
R2 + R1
R
, R = Parasitic Line Resistance
P
P
(
)
R1
R
P
PARASITIC
LINE RESISTANCE
V
IN
LT1086 OUT
ADJ
IN
R1*
R2*
For example, using a LT1086CK (TO-3, Commercial) and
assuming:
R
L
VIN(max continuous) = 9V, VOUT = 5V, IOUT = 1A,
TA = 75°C, θHEAT SINK = 3°C/W,
θCASE-TO-HEAT SINK = 0.2°C/W for T package with
thermal compound.
*CONNECT R1 TO CASE
CONNECT R2 TO LOAD
1086 • F02
Figure 2. Connections for Best Load Regulation
Power dissipation under these conditions is equal to:
PD = (VIN – VOUT)(IOUT) = 4W
Connected as shown, RP is not multiplied by the divider
ratio. RP is about 0.004Ω per foot using 16-gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible and use large wire or PC board
traces.
Junction temperature will be equal to:
TJ = TA + PD (θHEAT SINK +θ CASE-TO-HEAT SINK + θJC)
For the Control Section:
TJ = 75°C + 4W(3°C/W + 0.2°C/W + 1.5°C/W) = 94.6°C
95°C < 125°C = TJMAX (Control Section
Commercial Range)
Note that the resistance of the package leads for the H
package ≈0.06Ω/inch. While it is usually not possible to
connect the load directly to the package, it is possible to
connect larger wire or PC traces close to the case to avoid
voltage drops that will degrade load regulation.
For the Power Transistor:
TJ = 75°C + 4W(3°C/W + 0.2°C/W + 4°C/W) = 103.8°C
103.8°C < 150°C = TJMAX (Power Transistor
Commercial Range)
For fixed voltage devices the top of R1 is internally Kelvin
connected and the ground pin can be used for negative
side sensing.
sn1086 1086ffs
10
LT1086 Series
U
W U U
APPLICATIONS INFORMATION
In both cases the junction temperature is below the
maximum rating for the respective sections, ensuring
reliable operation.
In all cases proper mounting is required to ensure the best
possible heat flow from the die to the heat sink. Thermal
compound at the case-to-heat sink interface is strongly
recommended. InthecaseoftheHpackage, mountingthe
device so that heat can flow out the bottom of the case will
significantly lower thermal resistance (≈ a factor of 2). If
the case of the device must be electrically isolated, a
thermally conductive spacer can be used as long as its
added contribution to thermal resistance is considered.
Note that the case of all devices in this series is electrically
connected to the output.
Junction-to-case thermal resistance for the K and T pack-
ages is specified from the IC junction to the bottom of the
case directly below the die. This is the lowest resistance
path for heat flow. While this is also the lowest resistance
path for the H package, most available heat sinks for this
package are of the clip-on type that attach to the cap of the
package. The data sheet specification for thermal resis-
tance for the H package is therefore written to reflect this.
U
TYPICAL APPLICATIONS
5V, 1.5A Regulator
V
≥ 6.5V
5V AT 1.5A
IN
LT1086 OUT
ADJ
IN
121Ω
1%
+
+
10µF*
TANTALUM
10µF
365Ω
1%
LT1086 • AI02
*REQUIRED FOR STABILITY
SCSI-2 Active Termination
TERMPWR
110Ω
1N5817
110Ω
110Ω
2%
IN LT1086-2.85 OUT
GND
+
+
4.25V
TO 5.25V
10µF
TANTALUM
10µF
TANTALUM
0.1µF
CERAMIC
110Ω
2%
18 TOTAL
110Ω
2%
110Ω
LT1086 • TA03
sn1086 1086ffs
11
LT1086 Series
U
TYPICAL APPLICATIONS
1.2V to 15V Adjustable Regulator
5V Regulator with Shutdown
†
V
IN
IN
LT1086 OUT
ADJ
V
OUT
IN
LT1086
ADJ
OUT
5V
V
IN
R1
121Ω
121Ω
1%
+
+
+
10µF
1k
C1*
10µF
+
C2
100µF
100µF
R2
5k
365Ω
1%
2N3904
TTL
1k
LT1086 • TA05
*NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
†
R2 )
V
= 1.25V 1 +
LT1086 • TA04
OUT
(
R1
Battery Charger
Adjusting Output Voltage of Fixed Regulators
I
F
S
R
LT1086
OUT
1.25V
V
IN
IN
V
OUT
V
> 12V
5V TO 10V
100µF
IN
LT1086-5 OUT
GND
IN
+
+
ADJ
10µF
R1
+
R2
V
– 1.25 1 +
OUT
(
)
R1
1k
10µF*
LT1086 • TA06
I
=
LT1086 • TA07
F
R2
R2
– R 1 +
S
(
)
R1
*OPTIONAL IMPROVES RIPPLE REJECTION
dI
1
F
OUT
=
(
)
dV
R2
R1
– R 1 +
S
(
)
Regulator with Reference
Protected High Current Lamp Driver
V
> 11.5V
10V
15V
IN
LT1086-5 OUT
GND
OUT LT1086
ADJ
IN
IN
+
+
TTL OR
CMOS
12V
1A
100µF
10µF
5V
LT1029
10k
LT1086 • TA08
LT1086 • TA10
Remote Sensing
R
P
(MAX DROP 300mV)
V
OUT
V
IN
IN
LT1086 OUT
ADJ
5V
+
V
IN
100µF
25Ω
2
3
7
–
+
6
LM301A
1k
5µF
+
1
121Ω
365Ω
R
L
10µF
8
4
+
100pF
25Ω
RETURN
LT1086 • TA09
RETURN
sn1086 1086ffs
12
LT1086 Series
U
TYPICAL APPLICATIONS
High Efficiency Dual Linear Supply
L1
285µH
12V
1.5A
IN
LT1086 OUT
ADJ
1000µF
MBR360
HEAT SINK
124Ω*
2N6667 Q1
2.4k
DARLINGTON
10k
1k
510k
LT1004-2.5
30k
+
+
100µF
+
8
LT1011
4
20k*
30.1k*
2
3
D1
1N4002
MDA201
4700µF
1.07k*
+
–
7
–
L1
285µH
130VAC
TO 90VAC
STANCOR
P-8685
IN
LT1086 OUT
ADJ
1000µF
MBR360
HEAT SINK
2N6667
124Ω*
Q2
2.4k
30k
DARLINGTON
10k
1k
510k
LT1004-2.5
+
+
100µF
+
8
LT1011
4
20k*
30.1k*
2
3
D2
1N4002
MDA201
4700µF
1.07k*
+
–
7
–
–12V
1.5A
*1% FILM RESISTORS
MDA = MOTOROLA
L1 = PULSE ENGINEERING, INC. #PE-92106
LT1086 • TA11
High Efficiency Dual Supply
FEEDBACK PATH
MUR410
5V OUTPUT
(TYPICAL)
+
470µF
MUR410
12V
IN
LT1086 OUT
ADJ
1.5A
124Ω*
+
+
1N4002
10µF
470µF
+
V
1.07k*
IN
10µF
MUR410
IN
LT1086 OUT
ADJ
SWITCHING
REGULATOR
124Ω*
+
+
1N4002
10µF
470µF
+
1.07k*
10µF
–12V
1.5A
*1% FILM RESISTORS
LT1086 • TA12
sn1086 1086ffs
13
LT1086 Series
U
TYPICAL APPLICATIONS
Improving Ripple Rejection
Battery Backed Up Regulated Supply
5.2V LINE
5V BATTERY
V ≥ 6.5V
IN
IN
LT1086 OUT
R1
V
= 5V
OUT
IN
OUT
V
LT1086-5
GND
IN
+
ADJ
121Ω
10µF
+
1%
10µF
150µF
50Ω
R2
365Ω
1%
+
C1
10µF*
SELECT FOR
CHARGE RATE
LT1086 • TA14
IN
OUT
LT1086-5
GND
+
+
*C1 IMPROVES RIPPLE REJECTION.
SHOULD BE ≈ R1 AT RIPPLE FREQUENCY
100µF
6.5V
10µF
X
C
LT1086 • TA13
Automatic Light Control
Low Dropout Negative Supply
V
IN
IN
LT1086 OUT
V
IN
ADJ
1.2k
LT1086-12 OUT
GND
IN
+
100µF
10µF
+
+
100µF
= –12V
10,000µF
V
OUT
LT1086 • TA15
LT1086 • TA16
FLOATING INPUT
U
PACKAGE DESCRIPTION
H Package
3-Lead TO-39 Metal Can
(Reference LTC DWG # 05-08-1330)
0.350 – 0.370
(8.890 – 9.398)
0.200
(5.080)
TYP
0.305 – 0.335
(7.747 – 8.509)
0.050
0.100
(2.540)
(1.270)
MAX
0.165 – 0.185
(4.191 – 4.699)
PIN 1
REFERENCE
0.029 – 0.045
(0.737 – 1.143)
PLANE
*
0.100
(2.540)
0.028 – 0.034
(0.711 – 0.864)
0.016 – 0.021**
0.500
(12.700)
MIN
(0.406 – 0.533)
DIA
45°
H3(TO-39) 1098
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
OBSOLETE PACKAGE
sn1086 1086ffs
14
LT1086 Series
U
PACKAGE DESCRIPTION
K Package
2-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1310)
0.760 – 0.775
(19.30 – 19.69)
0.320 – 0.350
(8.13 – 8.89)
0.060 – 0.135
(1.524 – 3.429)
0.420 – 0.480
(10.67 – 12.19)
0.038 – 0.043
(0.965 – 1.09)
1.177 – 1.197
(29.90 – 30.40)
0.655 – 0.675
(16.64 – 17.15)
0.210 – 0.220
(5.33 – 5.59)
0.151 – 0.161
(3.86 – 4.09)
DIA, 2PLCS
0.167 – 0.177
(4.24 – 4.49)
R
0.425 – 0.435
(10.80 – 11.05)
0.067 – 0.077
(1.70 – 1.96)
0.490 – 0.510
(12.45 – 12.95)
R
K2 (TO-3) 1098
OBSOLETE PACKAGE
M Package
3-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1460)
0.060
(1.524)
TYP
0.390 – 0.415
(9.906 – 10.541)
0.060
(1.524)
0.165 – 0.180
(4.191 – 4.572)
0.256
(6.502)
0.045 – 0.055
(1.143 – 1.397)
15° TYP
+0.008
0.004
–0.004
0.060
(1.524)
0.059
(1.499)
TYP
0.183
(4.648)
0.330 – 0.370
(8.382 – 9.398)
+0.203
–0.102
0.102
(
)
0.095 – 0.115
(2.413 – 2.921)
0.075
(1.905)
0.090 – 0.110
(2.286 – 2.794)
0.050 ± 0.012
(1.270 ± 0.305)
0.300
(7.620)
+0.012
0.143
0.013 – 0.023
(0.330 – 0.584)
–0.020
0.050
(1.270)
BSC
+0.305
3.632
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
(
)
–0.508
M (DD3) 1098
sn1086 1086ffs
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1086 Series
U
PACKAGE DESCRIPTION
T Package
3-Lead Plastic TO-220
(Reference LTC DWG # 05-08-1420)
0.147 – 0.155
(3.734 – 3.937)
DIA
0.165 – 0.180
(4.191 – 4.572)
0.390 – 0.415
(9.906 – 10.541)
0.045 – 0.055
(1.143 – 1.397)
0.230 – 0.270
(5.842 – 6.858)
0.570 – 0.620
(14.478 – 15.748)
0.460 – 0.500
(11.684 – 12.700)
0.330 – 0.370
(8.382 – 9.398)
0.980 – 1.070
(24.892 – 27.178)
0.520 – 0.570
(13.208 – 14.478)
0.218 – 0.252
(5.537 – 6.401)
0.013 – 0.023
(0.330 – 0.584)
0.100
(2.540)
BSC
0.095 – 0.115
(2.413 – 2.921)
0.050
(1.270)
TYP
0.028 – 0.038
(0.711 – 0.965)
T3 (TO-220) 1098
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
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LT1129
700mA, Micropower, LDO
V
= 3.75V, I = 50µA, I = 16µA,
OUT(MIN) Q SD
IN
DD, SOT-223, S8, TO-220, TSSOP-20 Packages
LT1528
LT1585
LT1761
LT1762
LT1763
3A LDO for Microprocessor Applications
4.6A LDO , with Fast Transient Response
100mA, Low Noise Micropower, LDO
150mA, Low Noise Micropower, LDO
500mA, Low Noise Micropower, LDO
V
IN
= 4V to 15V, V = 3.30V, I = 400µA, I = 125µA,
OUT(MIN)
Q
SD
Fast Transient Response, DD, TO-220 Packages
V
IN
= 2.5V to 7V, V = 1.25V, I = 8mA,
OUT(MIN)
Q
Fast Transient Response, DD, TO-220 Packages
V
IN
= 1.8V to 20V, V = 1.22V, I = 20µA, I = <1µA,
OUT(MIN)
Q
SD
Low Noise < 20µV
, Stable with 1µF Ceramic Capacitors, ThinSOTTM Package
RMS P-P
V
IN
= 1.8V to 20V, V
= 1.22V, I = 25µA, I = <1µA,
, MSOP Package
OUT(MIN)
Q
SD
Low Noise < 20µV
RMS P-P
V
IN
= 1.8V to 20V, V
OUT(MIN)
= 1.22V, I = 30µA, I = <1µA,
Q
SD
Low Noise < 20µV
, S8 Package
RMS P-P
LT1764/LT1764A 3A, Low Noise, Fast Transient Response, LDOs
LT1962 300mA, Low Noise Micropower, LDO
LT1963/LT1963A 1.5A, Low Noise, Fast Transient Response, LDOs
V
= 2.7V to 20V, V
= 1.21V, I = 1mA, I = <1µA, Low Noise
IN
OUT(MIN) Q SD
< 40µV
, “A” Version Stable with Ceramic Capacitor, DD, TO-220 Packages
RMS P-P
V
IN
= 1.8V to 20V, V
= 1.22V, I = 30µA, I = <1µA,
, MS8 Package
OUT(MIN) Q SD
Low Noise < 20µV
RMS P-P
V
IN
= 2.1V to 20V, V
= 1.21V, I = 1mA, I = <1µA,
OUT(MIN)
Q
SD
Low Noise < 40µV
,“A” Version Stable with Ceramic Capacitor,
RMS P-P
DD, TO-220, SOT-223, S8 Packages
LT1964
200mA, Low Noise Micropower, Negative LDO
V
IN
= –0.9V to –20V, V = –1.21V, I = 30µA, I = 3µA,
OUT(MIN)
Q
SD
Low Noise < 30µV
, Stable with Ceramic Capacitors, ThinSOT Package
RMS P-P
ThinSOT is a trademark of Linear Technology Corporation.
sn1086 1086ffs
LT/TP 0703 1K REV F • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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© LINEAR TECHNOLOGY CORPORATION 1988
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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