LT3082

200mA Single Resistor Low

Dropout Linear Regulator

FEATURES

n

DESCRIPTION

The LT

®

3082 is a 200mA low dropout linear regulator that

can be paralleled to increase output current or spread heat

in surface mounted boards. Architected as a precision

current source and voltage follower, this regulator beneﬁts

many applications requiring high current, adjustability to

zero and no heat sink. The LT3082 withstands reverse

input voltages and reverse output-to-input voltages without

reverse-current ﬂow.

A key feature of the LT3082 is the capability to supply a

wide output voltage range. A precision “0” TC 10μA ref-

erence current source drives a single resistor to program

the output voltage to any level between zero and 38.5V.

The LT3082 is stable with only 2.2μF of capacitance on

the output; the IC uses small ceramic capacitors that

do not require additional ESR as is common with other

regulators.

Internal protection circuitry includes reverse-battery and

reverse-current protection, current limiting and ther-

mal limiting. The LT3082 is offered in the thermally en-

hanced 8-lead TSOT-23, 3-lead SOT-223 and 8-lead 3mm

× 3mm DFN packages.

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Outputs May Be Paralleled for Higher Output

Current or Heat Spreading

Maximum Output Current: 200mA

Wide Input Voltage Range: 1.2V to 40V

Output Adjustable to 0V

Stable with Minimum 2.2μF Ceramic Capacitors

Single Resistor Sets Output Voltage

Initial Set Pin Current Accuracy: 1%

Low Output Noise: 33μV

RMS

(10Hz to 100kHz)

Reverse-Battery Protection

Reverse-Current Protection

<1mV Load Regulation Typical

<0.001%/V Line Regulation Typical

Current Limit and Thermal Shutdown Protection

Available in 8-Lead SOT-23, 3-Lead SOT-223 and

8-Lead 3mm × 3mm DFN Packages

APPLICATIONS

n

All-Surface Mount Power Supply

Post Regulator for Switching Supplies

Low Parts Count Variable Voltage Supply

Low Output Voltage Supply

Battery Powered Regulator

TYPICAL APPLICATION

Variable Output Voltage Battery Powered Supply

IN

9V

1μF

10μA

LT3082

SET PIN CURRENT (μA)

SET Pin Current vs Temperature

10.100

10.075

10.050

10.025

10.000

9.975

9.950

9.925

9.900

–50 –25

3082 TA01a

+

–

SET

C

SET

0.1μF

R

SET

500k

OUT

V

OUT

= 10μA • R

SET

C

OUT

2.2μF

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 TA01b

3082f

1

LT3082

ABSOLUTE MAXIMUM RATINGS

(Note 1) All Voltages Relative to V

OUT

IN Pin Voltage Relative to SET, OUT ........................±40V

SET Pin Current (Note 6) .....................................±15mA

SET Pin Voltage (Relative to OUT, Note 6) ...............±10V

Output Short-Circuit Duration .......................... Indeﬁnite

Operating Junction Temperature Range (Notes 2, 8)

E, I Grades ......................................... –40°C to 125°C

MP Grade........................................... –55°C to 125°C

Storage Temperature Range................... –65°C to 150°C

Lead Temperature (ST, TS8 Packages Only)

Soldering, 10 sec .............................................. 300°C

PIN CONFIGURATION

TOP VIEW

OUT

NC

SET

1

2

3

4

9

8 IN

7 IN

6 NC

5 NC

1

SET

TAB IS OUT

TOP VIEW

3

2

IN

OUT

NC 1

OUT 2

OUT 3

OUT 4

TOP VIEW

8 IN

7 IN

6 NC

5 SET

DD PACKAGE

8-LEAD (3mm 3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 28°C/W,

θ

JC

= 3°C/W

EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO OUT ON

THE PCB; SEE THE APPLICATIONS INFORMATION SECTION

ST PACKAGE

3-LEAD PLASTIC SOT-223

T

JMAX

= 125°C,

θ

JA

= 24°C/W,

θ

JC

= 15°C/W

TAB IS OUT, MUST BE SOLDERED TO OUT ON THE PCB;

SEE THE APPLICATIONS INFORMATION SECTION

TS8 PACKAGE

8-LEAD PLASTIC TSOT-23

T

JMAX

= 125°C,

θ

JA

= 57°C/W,

θ

JC

= 15°C/W

ORDER INFORMATION

LEAD FREE FINISH

LT3082EDD#PBF

LT3082IDD#PBF

LT3082EST#PBF

LT3082IST#PBF

LT3082MPST#PBF

LT3082ETS8#PBF

LT3082ITS8#PBF

LEAD BASED FINISH

LT3082EDD

LT3082IDD

LT3082EST

LT3082IST

LT3082MPST

LT3082ETS8

LT3082ITS8

TAPE AND REEL

LT3082EDD#TRPBF

LT3082IDD#TRPBF

LT3082EST#TRPBF

LT3082IST#TRPBF

LT3082MPST#TRPBF

LT3082ETS8#TRPBF

LT3082ITS8#TRPBF

TAPE AND REEL

LT3082EDD#TR

LT3082IDD#TR

LT3082EST#TR

LT3082IST#TR

LT3082MPST#TR

LT3082ETS8#TR

LT3082ITS8#TR

PART MARKING*

LDYT

3082

3082MP

LTDYV

PART MARKING*

LDYT

3082

3082MP

LTDYV

PACKAGE DESCRIPTION

8-Lead (3mm

×

3mm) Plastic DFN

8-Lead (3mm

×

3mm) Plastic DFN

3-Lead Plastic SOT-223

8-Lead Plastic SOT-23

PACKAGE DESCRIPTION

8-Lead (3mm

×

3mm) Plastic DFN

8-Lead (3mm

×

3mm) Plastic DFN

3-Lead Plastic SOT-223

8-Lead Plastic SOT-23

TEMPERATURE RANGE

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

TEMPERATURE RANGE

–40°C to 125°C

–55°C to 125°C

–40°C to 125°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to:

http://www.linear.com/tapeandreel/

3082f

2

LT3082

ELECTRICAL CHARACTERISTICS

PARAMETER

SET Pin Current

Offset Voltage (V

OUT

– V

SET

)

Load Regulation (Note 7)

Line Regulation

Minimum Load Current (Note 3)

Dropout Voltage (Note 4)

Current Limit

Error Ampliﬁer RMS Output Noise (Note 5)

Reference Current RMS Output Noise (Note 5)

Ripple Rejection

I

SET

V

OS

ΔI

SET

ΔV

OS

ΔI

SET

ΔV

OS

The

l

denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T

J

= 25°C. (Note 2)

CONDITIONS

V

IN

= 2V, I

LOAD

= 1mA

2V ≤ V

IN

≤ 40V, 1mA ≤ I

LOAD

≤ 200mA

V

IN

= 2V, I

LOAD

= 1mA

V

IN

= 2V, I

LOAD

= 1mA

ΔI

LOAD

= 1mA to 200mA

ΔI

LOAD

= 1mA to 200mA

ΔV

IN

= 2V to 40V, I

LOAD

= 1mA

ΔV

IN

= 2V to 40V, I

LOAD

= 1mA

2V ≤ V

IN

≤ 40V

I

LOAD

= 10mA

I

LOAD

= 200mA

V

IN

= 5V, V

SET

= 0V, V

OUT

= –0.1V

,

I

LOAD

= 200mA, 10Hz ≤ f ≤ 100kHz, C

OUT

= 10μF

C

SET

= 0.1μF

10Hz ≤ f ≤ 100kHz

f = 120Hz, V

RIPPLE

= 0.5V

P-P

, I

LOAD

= 0.1A,

C

OUT

= 2.2μF C

SET

= 0.1μF

,

f = 10kHz

f = 1MHz

I

SET

10ms Pulse

l

MIN

9.90

9.80

–2

–4

TYP

10

MAX

10.10

10.20

2

4

UNITS

μA

mV

nA

mV

nA/V

mV/V

μA

V

mA

μV

RMS

nA

RMS

dB

%/W

–0.1

–0.5

0.03

0.003

300

1.22

1.3

200

300

33

0.7

90

75

20

0.003

–2

0.2

0.010

500

1.45

1.65

Thermal Regulation

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

Unless otherwise speciﬁed, all voltages are with respect to V

OUT

.

The LT3082E is tested and speciﬁed under pulse load conditions such

that T

J

≅

T

A

. The LT3082E is 100% tested at T

A

= 25°C. Performance at

–40°C and 125°C is assured by design, characterization, and correlation

with statistical process controls. The LT3082I is guaranteed to meet all

data sheet speciﬁcations over the full –40°C to 125°C operating junction

temperature range. The LT3082MP is 100% tested and guaranteed over

the –55°C to 125°C operating junction temperature range.

Note 3:

Minimum load current is equivalent to the quiescent current of

the part. Since all quiescent and drive current is delivered to the output

of the part, the minimum load current is the minimum current required to

maintain regulation.

Note 4:

For the LT3082, dropout is speciﬁed as the minimum input-to-

output voltage differential required supplying a given output current.

Note 5:

Adding a small capacitor across the reference current resistor

lowers output noise. Adding this capacitor bypasses the resistor shot

noise and reference current noise; output noise is then equal to error

ampliﬁer noise (see the Applications Information section).

Note 6:

Diodes with series 1k resistors clamp the SET pin to the OUT pin.

These diodes and resistors only carry current under transient overloads.

Note 7:

Load regulation is Kelvin-sensed at the package.

Note 8:

This IC includes overtemperature protection that protects the

device during momentary overload conditions. Junction temperature

exceeds the maximum operating junction temperature when

overtemperature protection is active. Continuous operation above the

speciﬁed maximum operating junction temperature may impair device

reliability.

3082f

3

LT3082

TYPICAL PERFORMANCE CHARACTERISTICS

SET Pin Current

10.100

10.075

SET PIN CURRENT (μA)

OFFSET VOLTAGE (mV)

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G01

9.80

10

10.20

9.90

10.10

SET PIN CURRENT DISTRIBUTION (μA)

3082 G02

SET Pin Current Distribution

N = 1326

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

Offset Voltage (V

OUT

– V

SET

)

10.050

10.025

10.000

9.975

9.950

9.925

9.900

–50 –25

–2.0

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G03

Offset Voltage Distribution

N = 1326

1.00

0.75

OFFSET VOLTAGE (mV)

Offset Voltage

I

LOAD

= 1mA

100

50

0

OFFSET VOLTAGE (μV)

–50

–100

–150

–200

–250

–300

–350

–400

0

5

10 15 20 25 30 35

INPUT-TO-OUTPUT VOLTAGE (V)

40

3082 G05

Offset Voltage

0.50

0.25

0

–0.25

–0.50

–0.75

–2

0

–1

1

V

OS

DISTRIBUTION (mV)

2

3082 G04

–1.00

0

50

150

100

LOAD CURRENT (mA)

200

3082 G06

Load Regulation

CHANGE IN OFFSET VOLTAGE WITH LOAD (μV)

100

50

0

–50

–100

–150

–200

–250

–300

–350

–400

–50 –25

0

(V

OUT

– V

SET

)

CHANGE IN OFFSET VOLTAGE

CHANGE IN REFERENCE CURRENT

ΔI

LOAD

= 1mA TO 200mA

V

IN

– V

OUT

= 3V

20

10

0

–10

–20

–30

–40

–50

–60

–70

–80

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G07

Minimum Load Current

600

500

400

300

200

100

0

–50 –25

CHANGE IN REFERENCE CURRENT WITH LOAD (nA)

MINIMUM LOAD CURRENT (μA)

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G08

3082f

4

LT3082

TYPICAL PERFORMANCE CHARACTERISTICS

Dropout Voltage

1.6

DROPOUT VOLTAGE (V

IN

– V

OUT

) (V)

DROPOUT VOLTAGE (V

IN

– V

OUT

) (V)

1.4

T

J

= –55°C

1.2

T

J

= 25°C

1.0

0.8

0.6

0.4

0.2

0

25

50 75 100 125 150 175 200

LOAD CURRENT (mA)

3082 G09

Dropout Voltage

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

–50 –25

I

LOAD

= 200mA

I

LOAD

= 100mA

CURRENT LIMIT (mA)

400

350

300

250

200

150

100

50

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G10

Current Limit

T

J

= 125°C

T

J

= 25°C

0

2

6

8

10

4

INPUT-TO-OUTPUT DIFFERENTIAL VOLTAGE (V)

3082 G11

Current Limit

500

450

400

CURRENT LIMIT (mA)

350

300

250

200

150

100

50

V

IN

= 7V

V

OUT

= 0V

0

25 50 75 100 125 150

TEMPERATURE (°C)

3082 G12

OUTPUT VOLTAGE DEVIATION (mV)

200

150

100

50

0

–50

–100

–150

Load Transient Response

LOAD

CURRENT (mA)

250

0

50 100 150 200 250 300 350 400 450 500

0

–50 –25

TIME (μs)

V

OUT

= 1V

C

SET

= 0.1μF

C

IN

= 1μF CERAMIC

ΔI

LOAD

= 10mA to 200mA

C

OUT

= 2.2μF CERAMIC

3082 G13

Line Transient Response

OUTPUT VOLTAGE

DEVIATION (mV)

60

40

20

0

–20

–40

6

4

2

0

50 100 150 200 250 300 350 400 450 500

INPUT

VOLTAGE (V)

OUTPUT VOLTAGE (V)

2.0

1.5

1.0

0.5

0

Turn-On Response

INPUT

VOLTAGE (V)

4

2

0

10 20 30 40 50 60 70 80 90 100

TIME (μs)

V

OUT

= 1V

C

SET

= 0.1μF

C

IN

= 1μF CERAMIC

I

LOAD

= 10mA

C

OUT

= 2.2μF CERAMIC

3082 G14

TIME (μs)

C

OUT

= 2.2μF CERAMIC C

SET

= 0

R

SET

= 100k

R

LOAD

= 5Ω

3082f

5

参数名称	属性值
欧盟限制某些有害物质的使用	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
类型 Type	LDO
Number of Outputs	1
Polarity	Positive
输出类型 Output Type	Adjustable
Output Voltage (V)	0 to 40
Maximum Output Current (A)	0.2
Minimum Input Voltage (V)	1.2
Maximum Input Voltage (V)	40
Maximum Dropout Voltage @ Current (V)	1.65@200mA\|1.45@10mA
Line Regulation	0.2nA/V
Load Regulation	-0.1nA(Typ)
Maximum Quiescent Current (mA)	0.5
Junction to Ambient	28°C/W
Junction to Case	3°C/W
Special Features	Thermal Shutdown Protection\|Current Limit
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Industrial
系列 Packaging	Tape and Reel
Supplier Package	DFN EP
Pin Count	8
Standard Package Name	DFN
Mounting	Surface Mount
Package Height	0.75(Max)
Package Length	3
Package Width	3
PCB changed	8
Lead Shape	No Lead

LT3082IDD#TRPBF

LT3082IDD#TRPBF概述

LT3082IDD#TRPBF规格参数

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