ANALOG DEVICES LT 1086 IM Datasheet

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

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LT1086 Series

V

IN

V

OUT

ADJ
(GND)

†

M PACKAGE

3-LEAD PLASTIC DD

FRONT VIEW

TAB IS

OUTPUT

3

2

1

WW

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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

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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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