FEATURES
■
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
■
Line Regulation: 0.015%
■
Load Regulation: 0.1%
■
100% Thermal Limit Functional Test
■
Ripple Rejection >75dB
■
Available in 3-Pin TO-220 and 3-Pin DD Packages
LT1086 Series
1.5A Low Dropout Positive
Regulators Adjustable and
Fixed 2.85V, 3.3V, 3.6V, 5V, 12V
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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
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 reference/ouput voltage to 1%. Current limit is also trimmed,
minimizing the stress on both the regulator and power
source circuitry under overload conditions.
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APPLICATIO S
■
SCSI-2 Active Terminator
■
High Efficiency Linear Regulators
■
Post Regulators for Switching Supplies
■
Constant Current Regulators
■
Battery Chargers
■
Microprocessor Supply
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TYPICAL APPLICATIO
5V to 3.3V Regulator
V
≥ 4.75V 3.3V AT 1.5A
IN
10µF*
TANTALUM
LT1086-3.3
IN OUT
GND
LT1086 • TA01
10µF
TANTALUM
The LT1086 is pin compatible with older 3-terminal adjustable regulators. A minimum 10µF output capacitor is
required on these devices.
The LT1086 offers excellent line and load regulation specifications 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1086 Dropout Voltage
2
INDICATES GUARANTEED TEST POINT
–55°C ≤ TJ ≤ 150°C
1
0°C ≤ T
≤ 125°C
J
T
= –55°C
J
= 25°C
T
J
= 150°C
T
J
*MAY BE OMITTED IF INPUT SUPPLY IS WELL
BYPASSED WITHIN 2" OF THE LT1086
MINIMUM INPUT/OUTPUT DIFFERENTIAL (V)
0
0
0.5
OUTPUT CURRENT (A)
1
1.5
LT1086 • TA02
sn1086 1086ffs
1
LT1086 Series
V
IN
V
OUT
ADJ
(GND)
†
M PACKAGE
3-LEAD PLASTIC DD
FRONT VIEW
TAB IS
OUTPUT
3
2
1
WW
W
ABSOLUTE MAXIMUM RATINGS
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(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°C to 125°C
Power Transistor............................. 0°C to 150°C
“I” Grades
Control Section .......................... –40°C to 125°C
Power Transistor........................ – 40°C to 150°C
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W
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PACKAGE/ORDER INFORMATION
BOTTOM VIEW
V
IN
3-LEAD TO-39 METAL CAN
2
13
H PACKAGE
θJA = 150°C/W
ADJ
V
OUT
(CASE)
ORDER
PART NUMBER
LT1086CH
LT1086MH
“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
of 5mA is required to maintain regulation.
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PRECONDITIONING
100% Thermal Shutdown Functional Test.
ORDER
PART NUMBER
LT1086CM
LT1086CM-3.3
LT1086CM-3.6
θJA = 30°C/W**
** WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA
OVER BACKSIDE GROUND PLANE OR INTERNAL POWER
PLANE. θJA CAN VARY FROM 20°C/W TO >40°C/W
DEPENDING ON MOUNTING TECHNIQUE.
LT1086IM
LT1086IM-3.3
ORDER
BOTTOM VIEW
V
IN
2
CASE
IS OUTPUT
PART NUMBER
LT1086CK
LT1086CK-5
LT1086CK-12
ADJ (GND)*
1
K PACKAGE
2-LEAD TO-3 METAL CAN
θJA = 35°C/W
LT1086IK
LT1086IK-5
LT1086IK-12
LT1086MK
LT1086MK-5
LT1086MK-12
OBSOLETE PACKAGES
Consider the T Package for Alternate Source
†
For fixed versions.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
TAB IS
OUTPUT
FRONT VIEW
3
2
1
T PACKAGE
3-LEAD PLASTIC TO-220
θJA = 50°C/W
V
IN
V
OUT
ADJ
(GND)
ORDER
PART NUMBER
LT1086CT
LT1086CT-2.85
LT1086CT-3.3
LT1086IT
†
LT1086IT-5
LT1086IT-12
LT1086CT-3.6
LT1086CT-5
LT1086CT-12
sn1086 1086ffs
LT1086 Series
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage LT1086, LT1086H I
(Note 3) 10mA ≤ I
Output Voltage LT1086-2.85 I
(Note 3) 0V ≤ I
LT1086-3.3 VIN = 5V, I
LT1086-3.6 VIN = 5V, I
LT1086-5 I
LT1086-12 I
Line Regulation LT1086, LT1086H I
LT1086-2.85 I
LT1086-3.3 4.5V ≤ VIN ≤ 18V, I
LT1086-3.6 4.75V ≤ VIN ≤ 18V, I
LT1086-5 I
LT1086-12 I
Load Regulation LT1086, LT1086H (VIN – V
LT1086-2.85 VIN = 5V, 0 ≤ I
LT1086-3.3 VIN = 5V, 0 ≤ I
LT1086-3.6 VIN = 5.25V, 0 ≤ I
LT1086-5 VIN = 8V, 0 ≤ I
LT1086-12 VIN = 15V, 0 ≤ I
Dropout Voltage LT1086/-2.85/-3.3/-3.6/-5/-12 ∆V
– V
OUT
)
(V
IN
LT1086H ∆V
= 10mA, TJ = 25°C, (VIN – V
OUT
OUT
4.75V ≤ V
5V ≤ V
4.75V ≤ V
= 4.75V, I
V
IN
OUT
0 ≤ I
OUT
0 ≤ I
LOAD
OUT
OUT
OUT
T
= 25°C (Notes 2, 3) 0.1 0.3 %
J
= 5V, 0 ≤ I
V
IN
REF
≤ 1.5A, (0.5A for LT1086H), 1.5V ≤ (VIN – V
OUT
= 0mA, TJ = 25°C, VIN = 5V 2.82 2.85 2.88 V
≤ 1.5A, 4.35V ≤ VIN ≤ 18V ● 2.79 2.85 2.91 V
OUT
= 0mA, TJ = 25°C 3.267 3.300 3.333 V
OUT
≤ 18V, 0V ≤ I
IN
= 0mA, TJ = 25°C 3.564 3.600 3.636 V
OUT
≤ 18V, 0 ≤ I
IN
≤ 18V, 0 ≤ I
IN
OUT
OUT
≤ 1.5A ● 3.500 3.672 V
OUT
OUT
= 1.5A, TJ ≥ 0°C 3.300 3.672 V
= 0mA, TJ = 25°C, VIN = 8V 4.950 5.000 5.050 V
≤ 1.5A, 6.5V ≤ VIN ≤ 20V ● 4.900 5.000 5.100 V
OUT
= 0mA, TJ = 25°C, VIN = 15V 11.880 12.000 12.120 V
≤ 1.5A, 13.5V ≤ VIN ≤ 25V ● 11.760 12.000 12.240 V
OUT
= 10mA, 1.5V ≤ (VIN – V
= 0mA, TJ = 25°C, 4.35V ≤ VIN ≤ 18V 0.3 6 mV
= 0mA, TJ = 25°C 0.5 10 mV
OUT
= 0mA, TJ = 25°C 0.5 10 mV
OUT
= 0mA, TJ = 25°C, 6.5V ≤ VIN ≤ 20V 0.5 10 mV
= 0mA, TJ = 25°C, 13.5V ≤ VIN ≤ 25V 1.0 25 mV
) = 3V, 10mA ≤ I
OUT
≤ 1.5A, TJ = 25°C (Notes 2, 3) 3 12 mV
OUT
≤ 1.5A, TJ = 25°C (Notes 2, 3) 3 15 mV
OUT
≤ 1.5A, TJ = 25°C (Notes 2, 3) 3 15 mV
OUT
≤ 1A, TJ = 25°C215mV
OUT
≤ 1.5A, TJ = 25°C (Notes 2, 3) 5 20 mV
OUT
≤ 1.5A, TJ = 25°C (Notes 2, 3) 12 36 mV
OUT
, ∆V
= 1%, I
REF
= 0.5A (Note 4) ● 0.95 1.25 V
= 1%, I
OUT
OUT
) = 3V 1.238 1.250 1.262 V
OUT
) ≤ 15V ● 1.225 1.250 1.270 V
OUT
≤ 1.5A ● 3.235 3.300 3.365 V
≤ 1A, TJ ≥ 0°C 3.500 3.672 V
) ≤ 15V, TJ = 25°C 0.015 0.2 %
OUT
≤ 1.5A, (0.5A for LT1086H)
OUT
= 1.5A (Note 4) ● 1.3 1.5 V
OUT
● 0.035 0.2 %
● 0.6 6 mV
● 1.0 10 mV
● 1.0 10 mV
● 1.0 10 mV
● 2.0 25 mV
● 0.2 0.4 %
● 620 mV
● 725 mV
● 625 mV
● 425 mV
● 10 35 mV
● 24 72 mV
sn1086 1086ffs
3
LT1086 Series
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit LT1086/-2.85/-3.3/-3.6/-5/-12 (VIN – V
(V
IN
LT1086H (VIN – V
Minimum Load Current LT1086/LT1086H (VIN – V
(V
IN
– V
OUT
OUT
OUT
Quiescient Current LT1086-2.85 VIN ≤ 18V ● 510 mA
LT1086-3.3 V
LT1086-3.6 V
LT1086-5 V
LT1086-12 V
≤ 18V ● 510 mA
IN
≤ 18V ● 510 mA
IN
≤ 20V ● 510 mA
IN
≤ 25V ● 510 mA
IN
Thermal Regulation TA = 25°C, 30ms pulse 0.008 0.04 %/W
Ripple Rejection f = 120Hz, C
LT1086, LT1086H C
LT1086-2.85 V
LT1086-3.3 V
LT1086-3.6 V
LT1086-5 V
LT1083-12 V
= 25µF Tantalum, I
OUT
ADJ
= 6V ● 60 72 dB
IN
= 6.3V ● 60 72 dB
IN
= 6.6V ● 60 72 dB
IN
= 8V ● 60 68 dB
IN
= 15V ● 54 60 dB
IN
= 25µF, (VIN – V
Adjust Pin Current LT1086, LT1086H TJ = 25°C55µA
Adjust Pin Current LT1086, LT1086H 10mA ≤ I
Change 1.5V ≤ (V
OUT
IN
Temperature Stability ● 0.5 %
Long-Term Stability TA = 125°C, 1000 Hrs. 0.3 1 %
RMS Output Noise TA = 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
) = 5V ● 1.50 2.00 A
OUT
– V
) = 25V ● 0.05 0.15 A
OUT
) = 5V ● 0.50 0.700 A
) = 25V ● 0.02 0.075 A
) = 25V (Note 5) ● 510 mA
= 1.5A, (I
OUT
= 0.5A for LT1086H)
OUT
) = 3V ● 60 75 dB
OUT
● 120 µA
≤ 1.5A (0.5A for LT1086H)
– V
) ≤ 15V ● 0.2 5 µA
OUT
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.
Note 3: Line and load regulation are guaranteed up to the maximum power
dissipation of 15W (3W for the LT1086H). Power dissipation is determined
4
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
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INPUT/OUTPUT DIFFERENTIAL (V)
0
0
MINIMUM OPERATING CURRENT (mA)
1
3
4
5
10
7
10
20
25
LT1086 • TPC03
2
8
9
6
5
15
30
35
TJ = 150°C
T
J
= 25°C
T
J
= –55°C
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TYPICAL PERFORMANCE CHARACTERISTICS
LT1086 Short-Circuit Current
2.5
2.0
1.5
1.0
SHORT-CIRCUIT CURRENT (A)
0.5
0
0
TJ = 150°C
GUARANTEED
OUTPUT CURRENT
10 15 20
5
INPUT/OUTPUT DIFFERENTIAL (V)
Temperature Stability
2
1
0
–1
OUTPUT VOLTAGE CHANGE (%)
–2
–25
–50
0
50
25
TEMPERATURE (°C)
TJ = 25°C
T
= –55°C
J
75
25 30
LT1086 • TPC01
100
LT1086 • TPC04
125
150
0.10
∆I = 1.5A
0.05
0
–0.05
–0.10
–0.15
OUTPUT VOLTAGE DEVIATION (%)
–0.20
–50
050
–25 25
TEMPERATURE (°C)
Adjust Pin Current
100
90
80
70
60
50
40
30
ADJUST PIN CURRENT (µA)
20
10
0
–50
–25 25
0
50
TEMPERATURE (°C)
100
75
LT1086 • TPC02
125
100
75
LT1086 • TPC05
125
150
150
LT1086 Series
Minimum Operating Current
(Adjustable Device)LT1086 Load Regulation
LT1086 Maximum Power
Dissipation*
20
15
10
POWER (W)
5
0
60
50
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
LT1086MK
LT1086CT
LT1086CK
70
80
CASE TEMPERATURE (°C)
110
100
90
120
130
LT1086 • TPC06
140
150
100
V
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
20
10
0
10 1k 10k 100k
RIPPLE
– V
(V
IN
OUT
C
= 200µF AT FREQUENCIES < 60Hz
ADJ
= 25µF AT FREQUENCIES > 60Hz
C
ADJ
= 1.5A
I
OUT
100
≤ 3V
P-P
(VIN – V
) ≥ V
DROPOUT
FREQUENCY (Hz)
V
RIPPLE
≤ 0.5V
OUT
LT1086 • TPC07
) ≥ 3V
P-P
LT1086 Ripple Rejection
vs CurrentLT1086 Ripple Rejection LT1086-5 Ripple Rejection
100
90
80
70
60
50
40
30
RIPPLE REJECTION (dB)
V
20
10
= 5V
OUT
= 25µF
C
ADJ
= 25µF
C
OUT
0
0
0.25
0.5
OUTPUT CURRENT (A)
fR = 120Hz
≤ 3V
V
RIPPLE
fR = 20kHz
≤ 0.5V
V
RIPPLE
0.75 1.0
P-P
P-P
1.25
LT1086 • TPC08
1.5
80
70
60
50
40
30
RIPPLE REJECTION (dB)
20
10
0
10 1k 10k 100k
(V
I
OUT
– V
IN
= 1.5A
V
≤ 3V
RIPPLE
) ≥ V
OUT
DROPOUT
100
FREQUENCY (Hz)
P-P
(VIN – V
V
RIPPLE
OUT
) ≥ 3V
≤ 0.5V
P-P
LT1086 • TPC09
sn1086 1086ffs
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