LT3008EDC-1.2PBF_技术文档

LT3008 Series

µA I , 20mA, 45V

3

Q

Low Dropout Linear Regulators

FEATURES

DESCRIPTION

The LT^®3008 series are micropower, low dropout voltage

(LDO) linear regulators. The devices supply 20mA output

currentwithadropoutvoltageof300mV.No-loadquiescent

current is 3μA. Ground pin current remains at less than

5% of output current as load increases. In shutdown,

n

Ultralow Quiescent Current: 3μA

n

Input Voltage Range: 2.0V to 45V

n

Output Current: 20mA

n

Dropout Voltage: 300mV

n

Adjustable Output (V

= V

= 600mV)

ADJ

OUT(MIN)

n

Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V

Output Tolerance: 2% Over Load, Line and

Temperature

quiescent current is less than 1μA.

The LT3008 regulators optimize stability and transient

response with low ESR ceramic capacitors, requiring a

minimum of only 2.2μF. The regulators do not require

the addition of ESR as is common with other regulators.

Internal protection circuitry includes current limiting,

thermal limiting, reverse-battery protection and reverse-

current protection.

n

Stable with Low ESR, Ceramic Output Capacitors

(2.2μF Minimum)

n

Shutdown Current: <1μA

Current Limit Protection

Reverse-Battery Protection

Thermal Limit Protection

The LT3008 series are ideal for applications that require

moderate output drive capability coupled with ultralow

standby power consumption. The device is available in

ﬁxed output voltages of 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and

5V, and an adjustable version with an output voltage range

of 0.6V to 44.5V. The LT3008 is available in the thermally

enhanced 6-lead DFN and 8-lead TSOT-23 packages.

TSOT-23 and 2mm × 2mm DFN Packages

APPLICATIONS

n

Automotive

n

Low Current Battery-Powered Systems

n

Keep-Alive Power Supplies

Remote Monitoring

Utility Meters

n

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.

n

Low Power Industrial Applications

TYPICAL APPLICATION

3.3V, 20mA Supply with Shutdown

Dropout Voltage/Quiescent Current

500

450

400

350

300

250

200

150

100

50

6

5

4

3

2

1

0

I

= 20mA

LOAD

DROPOUT

VOLTAGE

V

OUT

3.3V

IN

OUT

LT3008-3.3

V

IN

20mA

3.8V TO

45V

2.2μF

1μF

SHDN SENSE

I

Q

GND

3008 TA01a

0

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 TA01b

3008fa

1

LT3008 Series

(Note 1)

ABSOLUTE MAXIMUM RATINGS

Operating Junction Temperature Range (Notes 2, 3)

LT3008E.............................................–40°C to 125°C

LT3008I..............................................–40°C to 125°C

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

Lead Temperature: Soldering, 10 sec

IN Pin Voltage ......................................................... 50V

OUT Pin Voltage...................................................... 50V

Input-to-Output Differential Voltage........................ 50V

ADJ Pin Voltage ...................................................... 50V

SENSE Pin Voltage.................................................. 50V

SHDN Pin Voltage (Note 8) ..................................... 50V

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

TS8 Package Only............................................. 300°C

PIN CONFIGURATION

TOP VIEW

6

5

4

GND

SHDN

IN

**SENSE/ADJ

OUT

1

2

3

8

7

6

5

NC

SHDN

GND

1

2

3

4

ADJ/SENSE**

OUT

IN

7

OUT

TS8 PACKAGE

8-LEAD PLASTIC TSOT-23

DC PACKAGE

6-LEAD (2mm s 2mm) PLASTIC DFN

T

= 125°C, θ = 65°C/W TO 85°C/W*

JA

JMAX

T

= 125°C, θ = 65°C/W TO 85°C/W*

JA

EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB

JMAX

* See the Applications Information Section.

** SENSE for Fixed Voltage Output Versions.

ORDER INFORMATION

LEAD FREE FINISH

LT3008EDC#PBF

TAPE AND REEL

PART MARKING*

LDPS

PACKAGE DESCRIPTION

TEMPERATURE RANGE

–40°C to 125°C

LT3008EDC#TRPBF

6-Lead (2mm × 2mm) Plastic DFN

LT3008IDC#PBF

LT3008IDC#TRPBF

LDPS

LT3008EDC-1.2#PBF

LT3008IDC-1.2#PBF

LT3008EDC-1.5#PBF

LT3008IDC-1.5#PBF

LT3008EDC-1.8#PBF

LT3008IDC-1.8#PBF

LT3008EDC-2.5#PBF

LT3008IDC-2.5#PBF

LT3008EDC-1.2#TRPBF

LT3008IDC-1.2#TRPBF

LT3008EDC-1.5#TRPBF

LT3008IDC-1.5#TRPBF

LT3008EDC-1.8#TRPBF

LT3008IDC-1.8#TRPBF

LT3008EDC-2.5#TRPBF

LT3008IDC-2.5#TRPBF

LFHC

LFHF

LFHH

LFHK

3008fa

2

LT3008 Series

ORDER INFORMATION

LEAD FREE FINISH

LT3008EDC-3.3#PBF

LT3008IDC-3.3#PBF

LT3008EDC-5#PBF

LT3008IDC-5#PBF

LT3008ETS8#PBF

LT3008ITS8#PBF

LT3008ETS8-1.2#PBF

LT3008ITS8-1.2#PBF

LT3008ETS8-1.5#PBF

LT3008ITS8-1.5#PBF

LT3008ETS8-1.8#PBF

LT3008ITS8-1.8#PBF

LT3008ETS8-2.5#PBF

LT3008ITS8-2.5#PBF

LT3008ETS8-3.3#PBF

LT3008ITS8-3.3#PBF

LT3008ETS8-5#PBF

LT3008ITS8-5#PBF

LEAD BASED FINISH

LT3008EDC

TAPE AND REEL

PART MARKING*

LFHN

PACKAGE DESCRIPTION

TEMPERATURE RANGE

–40°C to 125°C

TEMPERATURE RANGE

–40°C to 125°C

LT3008EDC-3.3#TRPBF

LT3008IDC-3.3#TRPBF

LT3008EDC-5#TRPBF

LT3008IDC-5#TRPBF

LT3008ETS8#TRPBF

LT3008ITS8#TRPBF

6-Lead (2mm × 2mm) Plastic DFN

8-Lead Plastic TSOT-23

LFHN

LFHQ

LTDSX

8-Lead Plastic TSOT-23

LT3008ETS8-1.2#TRPBF LTFHD

LT3008ITS8-1.2#TRPBF LTFHD

LT3008ETS8-1.5#TRPBF LTFHG

LT3008ITS8-1.5#TRPBF LTFHG

LT3008ETS8-1.8#TRPBF LTFHJ

LT3008ITS8-1.8#TRPBF LTFHJ

LT3008ETS8-2.5#TRPBF LTFHM

LT3008ITS8-2.5#TRPBF LTFHM

LT3008ETS8-3.3#TRPBF LTFHP

8-Lead Plastic TSOT-23

LT3008ITS8-3.3#TRPBF

LT3008ETS8-5#TRPBF

LT3008ITS8-5#TRPBF

TAPE AND REEL

LTFHP

LTFHR

PART MARKING*

LDPS

8-Lead Plastic TSOT-23

PACKAGE DESCRIPTION

LT3008EDC#TR

6-Lead (2mm × 2mm) Plastic DFN

8-Lead Plastic TSOT-23

LT3008IDC

LT3008IDC#TR

LDPS

LT3008EDC-1.2

LT3008EDC-1.2#TR

LT3008IDC-1.2#TR

LT3008EDC-1.5#TR

LT3008IDC-1.5#TR

LT3008EDC-1.8#TR

LT3008IDC-1.8#TR

LT3008EDC-2.5#TR

LT3008IDC-2.5#TR

LT3008EDC-3.3#TR

LT3008IDC-3.3#TR

LT3008EDC-5#TR

LT3008IDC-5#TR

LT3008ETS8#TR

LFHC

LT3008IDC-1.2

LFHC

LT3008EDC-1.5

LFHF

LT3008IDC-1.5

LFHF

LT3008EDC-1.8

LFHH

LT3008IDC-1.8

LFHH

LT3008EDC-2.5

LFHK

LT3008IDC-2.5

LFHK

LT3008EDC-3.3

LFHN

LT3008IDC-3.3

LFHN

LT3008EDC-5

LFHQ

LT3008IDC-5

LFHQ

LT3008ETS8

LTDSX

LT3008ITS8

LT3008ITS8#TR

8-Lead Plastic TSOT-23

3008fa

3

LT3008 Series

ORDER INFORMATION

LEAD FREE FINISH

LT3008ETS8-1.2

LT3008ITS8-1.2

LT3008ETS8-1.5

LT3008ITS8-1.5

LT3008ETS8-1.8

LT3008ITS8-1.8

LT3008ETS8-2.5

LT3008ITS8-2.5

LT3008ETS8-3.3

LT3008ITS8-3.3

LT3008ETS8-5

TAPE AND REEL

PART MARKING*

LTFHD

PACKAGE DESCRIPTION

8-Lead Plastic TSOT-23

TEMPERATURE RANGE

–40°C to 125°C

LT3008ETS8-1.2#TR

LT3008ITS8-1.2#TR

LT3008ETS8-1.5#TR

LT3008ITS8-1.5#TR

LT3008ETS8-1.8#TR

LT3008ITS8-1.8#TR

LT3008ETS8-2.5#TR

LT3008ITS8-2.5#TR

LT3008ETS8-3.3#TR

LT3008ITS8-3.3#TR

LT3008ETS8-5#TR

LT3008ITS8-5#TR

LTFHD

LTFHG

LTFHJ

LTFHM

LTFHP

LTFHR

LT3008ITS8-5

LTFHR

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/

ELECTRICAL CHARACTERISTICS ^Thel denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_J= 25°C. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

l

Operating Voltage

Regulated Output Voltage

2

45

V

LT3008-1.2: V = 2V, I

= 100μA

< 20mA

1.188

1.176

1.2

1.212

1.224

V

IN

LOAD

2V < V < 45V, 1μA < I

IN

LT3008-1.5: V = 2.05V, I

= 100μA

< 20mA

1.485

1.47

1.5

1.515

1.53

V

IN

LOAD

2.05V < V < 45V, 1μA < I

IN

LT3008-1.8: V = 2.35V, I

= 100μA

< 20mA

1.782

1.764

1.8

1.818

1.836

V

IN

LOAD

2.35V < V < 45V, 1μA < I

IN

LT3008-2.5: V = 3.05V, I

= 100μA

< 20mA

2.475

2.45

2.5

2.525

2.55

V

IN

LOAD

3.05V < V < 45V, 1μA < I

IN

LT3008-3.3: V = 3.85V, I

= 100μA

< 20mA

3.267

3.234

3.3

3.333

3.366

V

IN

LOAD

3.85V < V < 45V, 1μA < I

IN

LT3008-5: V = 5.55V, I

= 100μA

LOAD

< 20mA

LOAD

4.95

4.9

5

5.05

5.1

V

IN

5.55V < V < 45V, 1μA < I

IN

ADJ Pin Voltage (Notes 3, 4)

Line Regulation (Note 3)

V

= 2V, I

IN

= 100μA

594

588

600

606

612

mV

IN

LOAD

2V < V < 45V, 1μA < I

< 20mA

LOAD

l

1.2

1.5

1.8

2.5

3.3

5

6

7.5

9

mV

LT3008-1.2: ΔV = 2V to 45V, I

= 1mA

IN

LOAD

LT3008-1.5: ΔV = 2.05V to 45V, I

= 1mA

IN

LOAD

LT3008-1.8: ΔV = 2.35V to 45V, I

= 1mA

IN

12.5

16.5

25

LT3008-2.5: ΔV = 3.05V to 45V, I

IN

LT3008-3.3: ΔV = 3.85V to 45V, I

IN

LT3008-5: ΔV = 5.55V to 45V, I

= 1mA

LOAD

IN

0.6

3

LT3008: ΔV = 2V to 45V, I

= 1mA

IN

LOAD

3008fa

4

LT3008 Series

ELECTRICAL CHARACTERISTICS ^Thel denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_J= 25°C. (Note 2)

PARAMETER

CONDITIONS

LT3008-1.2: V = 2V, I

MIN

TYP

MAX

UNITS

l

Load Regulation (Note 3)

= 1μA to 10mA

= 1μA to 20mA

0.8

1

4

10

mV

IN

LOAD

V

= 2V, I

IN

l

LT3008-1.5: V = 2.05V, I

= 1μA to 10mA

= 1μA to 20mA

1

1.3

5

13

mV

IN

LOAD

V

= 2.05V, I

IN

l

LT3008-1.8: V = 2.35V, I

= 1μA to 10mA

= 1μA to 20mA

1.2

1.5

6

15

mV

IN

LOAD

V

= 2.35V, I

IN

l

LT3008-2.5: V = 3.05V, I

= 1μA to 10mA

= 1μA to 20mA

1.7

2.1

8.3

21

mV

IN

LOAD

V

= 3.05V, I

IN

l

LT3008-3.3: V = 3.85V, I

= 1μA to 10mA

= 1μA to 20mA

2.2

2.8

11

28

mV

IN

LOAD

V

= 3.85V, I

IN

l

LT3008-5:

LT3008:

V

= 5.55V, I

= 1μA to 10mA

= 1μA to 20mA

3.4

4.2

17

42

mV

IN

LOAD

l

V

= 2V, I

= 1μA to 10mA

= 1μA to 20mA

0.4

0.5

2

5

mV

IN

LOAD

Dropout Voltage

IN

I

= 100μA

115

170

270

300

3

180

250

mV

LOAD

l

V

= V

(Notes 5, 6)

OUT(NOMINAL)

I

= 1mA

250

350

mV

LOAD

I

= 10mA

340

470

mV

LOAD

I

= 20mA

365

500

mV

LOAD

Quiescent Current (Notes 6, 7)

GND Pin Current

I

= 0μA

μA

LOAD

6

l

I

= 0μA

3

6

21

160

350

6

12

50

500

1200

μA

LOAD

V

= V

+ 0.5V (Notes 6, 7)

OUT(NOMINAL)

= 100μA

= 1mA

IN

= 10mA

= 20mA

Output Voltage Noise (Note 9)

ADJ Pin Bias Current

C

= 2.2μF, I

= 20mA, BW = 10Hz to 100kHz

92

μV

RMS

OUT

LOAD

–10

0.4

10

nA

l

Shutdown Threshold

V

= Off to On

= On to Off

0.67

0.61

1.5

V

OUT

0.25

l

SHDN Pin Current

V

SHDN

V

SHDN

= 0V, V = 45V

μA

1

2

IN

= 45V, V = 45V

0.65

IN

l

Quiescent Current in Shutdown

Ripple Rejection (Note 3)

V

= 6V, V

= 0V

<1

μA

IN

SHDN

V

– V

= 2V, V

= 0.5V

,

IN

OUT

= 120Hz, I

RIPPLE

P-P

f

= 20mA

LOAD

RIPPLE

LT3008

58

54

53

52

49

47

42

70

66

65

64

61

59

54

dB

LT3008-1.2

LT3008-1.5

LT3008-1.8

LT3008-2.5

LT3008-3.3

LT3008-5

3008fa

5

LT3008 Series

ELECTRICAL CHARACTERISTICS ^Thel denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at T_J= 25°C. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Current Limit

V

= 45V, V

= 0

75

mA

IN

OUT

OUT(NOMINAL)

l

= V

+ 1V, ΔV

= –5%

22

OUT

Input Reverse-Leakage Current

Reverse-Output Current

V

= –45V, V

= 0

OUT

1

30

10

μA

IN

= 1.2V, V = 0

0.6

OUT

IN

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.

dropout, the output voltage equals (V – V

and LT3008-1.5, dropout voltage will be limited by the minimum input

voltage.

). For the LT3008-1.2

DROPOUT

IN

Note 6: To satisfy minimum input voltage requirements, the LT3008

Note 2: The LT3008 regulators are tested and speciﬁed under pulse load

adjustable version is tested and speciﬁed for these conditions with an

conditions such that T ≅ T . The LT3008E is 100% tested at T =25°C.

external resistor divider (61.9k bottom, 280k top) which sets V

to 3.3V.

J

A

OUT

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

and correlation with statistical process controls. The LT3008I is guaran-

teed over the full –40°C to 125°C operating junction temperature range.

The external resistor divider adds 9.69μA of DC load on the output. This

external current is not factored into GND pin current.

Note 7: GND pin current is tested with V = V

+ 0.55V and

IN

OUT(NOMINAL)

Note 3: The LT3008 adjustable version is tested and speciﬁed for these

conditions with the ADJ pin connected to the OUT pin.

a current source load. GND pin current will increase in dropout. For the

ﬁxed output voltage versions, an internal resistor divider will add about

1ꢀA to the GND pin current. See the GND Pin Current curves in the Typical

Performance Characteristics section.

Note 8: The SHDN pin can be driven below GND only when tied to the IN

pin directly or through a pull-up resistor. If the SHDN pin is driven below

GND by more than –0.3V while IN is powered, the output will turn on.

Note 9: Output noise is listed for the adjustable version with the ADJ pin

connected to the OUT pin. See the RMS Output Noise vs Load Current

curve in the Typical Performance Characteristics Section.

Note 4: Operating conditions are limited by maximum junction

temperature. The regulated output voltage speciﬁcation will not apply

for all possible combinations of input voltage and output current. When

operating at the maximum input voltage, the output current range must be

limited. When operating at the maximum output current, the input voltage

must be limited.

Note 5: Dropout voltage is the minimum input to output voltage

differential needed to maintain regulation at a speciﬁed output current. In

3008fa

6

LT3008 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

Dropout Voltage

Minimum Input Voltage

450

400

350

300

250

200

150

100

50

450

400

350

300

250

200

150

100

50

2

1.8

1.6

1.4

1.2

1

I

= 20mA

LOAD

T

= 125°C

J

20mA

1mA

T

= 25°C

10mA

100μA

J

0.8

0.6

0.4

0.2

0

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

0

2

4

6

8

10 12 14 16 18 20

TEMPERATURE (°C)

OUTPUT CURRENT (mA)

3008 G02

3008 G03

3008 G01

Output Voltage

LT3008-1.2

Output Voltage

LT3008-1.5

ADJ Pin Voltage

0.612

0.610

0.608

0.606

0.604

0.602

0.600

0.598

0.596

0.594

0.592

0.590

0.588

1.224

1.220

1.216

1.212

1.208

1.204

1.200

1.196

1.192

1.188

1.184

1.180

1.176

1.530

1.525

1.520

1.515

1.510

1.505

1.500

1.495

1.490

1.485

1.480

1.475

1.470

I

= 100μA

I

= 100μA

LOAD

I

= 100μA

LOAD

L

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G05

3008 G06

3008 G04

Output Voltage

LT3008-1.8

Output Voltage

LT3008-2.5

Output Voltage

LT3008-3.3

3.366

2.550

2.540

1.836

1.830

1.824

1.816

1.812

1.806

1.800

1.794

1.788

1.782

1.776

1.770

1.764

I

= 100μA

I

= 100μA

LOAD

I

= 100μA

LOAD

3.355

3.344

2.530

2.520

3.333

3.322

3.311

3.300

3.289

3.278

3.267

3.256

3.245

3.234

2.510

2.500

2.490

2.480

2.470

2.460

2.450

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G08

3008 G09

3008 G07

3008fa

7

LT3008 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

Output Voltage

LT3008-5

ADJ Pin Bias Current

Adjustable Quiescent Current

5.100

5.075

5.050

5.025

10

8

6

5

4

3

2

1

0

I

= 100μA

LOAD

6

4

2

5.000

4.975

4.950

4.925

4.900

0

–2

–4

–6

–8

–10

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

–50 –25

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G10

3008 G05

3008 G06

GND Pin Current

LT3008-1.2

GND Pin Current

LT3008-1.5

Quiescent Current

30

27

24

21

18

15

12

9

500

450

400

350

300

250

200

150

100

50

500

450

400

350

300

250

200

150

100

50

LT3008-1.2

LT3008-1.5

LT3008-1.8

LT3008-2.5

LT3008-3.3

LT3008-5

R

= 75Ω, I = 20mA

L L

R

= 60Ω, I = 20mA

L

R

= 150Ω, I = 10mA

L

R

= 120Ω, I = 10mA

L

6

R

L

= 15k, I = 100μA

L

R

= 12k, I = 100μA

L

3

R

= 1.5k, I = 1mA

L

R

= 1.2k, I = 1mA

L

0

1

2

3

4

5

6

7

8

9 10

0

2

3

4

5

6

7

8

9

10

0

2

3

4

5

6

7

8

9

10

1

INPUT VOLTAGE (V)

3008 G14

3008 G15

3008 G13

GND Pin Current

LT3008-1.8

GND Pin Current

LT3008-2.5

GND Pin Current

LT3008-3.3

500

450

400

350

300

250

200

150

100

50

500

450

400

350

300

250

200

150

100

50

500

450

400

350

300

250

200

150

100

50

R

= 165Ω, I = 20mA

L

R

= 90Ω, I = 20mA

L

R

= 125Ω, I = 20mA

L L

L

R

= 330Ω, I = 10mA

L

R

= 180Ω, I = 10mA

L

R

= 250Ω, I = 10mA

L L

L

R

L

= 33k, I = 100μA

L

R

2

= 25k, I = 100μA

L

R

L

= 18k, I = 100μA

L

R

= 1.8k, I = 1mA

R = 3.3k, I = 1mA

L L

R

L

= 2.5k, I = 1mA

L

0

2

3

4

5

6

7

8

9

10

0

3

4

5

6

7

8

9

10

0

2

3

4

5

6

7

8

9

10

1

INPUT VOLTAGE (V)

3008 G16

3008 G17

3008 G18

3008fa

8

LT3008 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

GND Pin Current

LT3008-5

GND Pin Current vs I_LOAD

SHDN Pin Thresholds

500

450

400

350

300

250

200

150

100

50

1000

100

10

1.5

1.4

1.3

1.2

1.1

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

V

= 3.8V

IN

OUT

= 3.3V

R

= 250Ω, I = 20mA

L

OFF TO ON

ON TO OFF

R

= 500Ω, I = 10mA

L

R

L

= 50k, I = 100μA

L

R

= 5k, I = 1mA

L

0

1

0.001

0.01

0.1

1

10

100

125 150

0

2

3

4

5

6

7

8

9

10

–50 –25

0

25 50 75 100

TEMPERATURE (°C)

1

INPUT VOLTAGE (V)

LOAD (mA)

3008 G19

3008 G21

3008 G20

Current Limit

SHDN Pin Input Current

2

1.8

1.6

1.4

1.2

1

100

90

80

70

60

50

40

30

20

10

0

2

1.8

1.6

1.4

1.2

1

V

= 45V

IN

V

= 2V

IN

V

= 45V

0.8

0.6

0.4

0.2

0

SHDN

0.8

0.6

0.4

0.2

0

–50

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G23

0

5

10 15 20 25 30 35 40 45

SHDN PIN VOLTAGE (V)

3008 G22

–25

–50

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G24

–25

Reverse-Output Current

Input Ripple Rejection

80

70

60

50

40

30

20

10

0

50

45

40

35

30

25

20

15

10

5

90

80

70

60

50

40

30

20

10

0

V

= 2.1V + 50mV

RMS

OUT

LOAD

OUT = ADJ = 1.2V

IN = SHDN = GND

IN

= 600mV

= 20mA

I

10μF

ADJ

V

= V

(NOMINAL) + 2V + 0.5V

OUT P-P

2.2μF

IN

RIPPLE AT f = 120Hz

= 20mA

OUT

I

LOAD

0

10

100

1000

10000 100000 1000000

–50

0

25 50 75 100 125 150

TEMPERATURE (°C)

3008 G25

–50

0

25 50 75

125 150

100

–25

TEMPERATURE (°C)

FREQUENCY (Hz)

3008 G26

3008 G27

3008fa

9

LT3008 Series

TYPICAL PERFORMANCE CHARACTERISTICS ^T_A^{= 25°C, unless otherwise noted.}

RMS Output Noise

vs Load Current

Load Regulation

Output Noise Spectral Density

500

450

5

4.5

4

100

10

1

C

= 10μF

5V

C

I

= 2.2μF

= 20mA

OUT

5V

OUT

$I = 1μA to 20mA

L

OUT

IN

3.3V

2.5V

1.8V

1.5V

1V

LOAD

V

= 600mV

= 2V

400

350

3.5

3

3.3V

300

250

200

150

0.6V

2.5V

1.8V

2.5

2

1.5V

1.5

1

1.2V

0.6V

100

50

0

0.5

0

–50

0.1

0.01

0.1

I

1

100

0.001

10

100

1k

10k

100k

0

25 50 75 100 125 150

TEMPERATURE (°C)

–25

(mA)

FREQUENCY (Hz)

LOAD

3008 G29

3008 G28

3008 G30

Transient Response

Transient Response (Load Dump)

I

= 1mA TO 20mA

= 5.5V

OUT

IN

I

= 1mA TO 20mA

= 5.5V

OUT

IN

V

C

V

C

V

= 5V

OUT

= 5V

OUT

50mV/DIV

= 2.2μF

= 10μF

V

OUT

V

OUT

50mV/DIV

45V

50mV/DIV

V

I

= 5V

= 20mA

= 4.7μF

OUT

V

IN

12V

I

10V/DIV

OUT

I

C

OUT

20mA/DIV

3008 G31

3008 G32

3008 G33

500μs/DIV

1ms/DIV

3008fa

10

LT3008 Series

PIN FUNCTIONS ^{(TSOT-23/DFN)}

SHDN (Pin 1/Pin 5): Shutdown. Pulling the SHDN pin

section). TheADJpinvoltageis600mVreferencedtoGND

and the output voltage range is 600mV to 44.5V.

low puts the LT3008 into a low power state and turns the

output off. If unused, tie the SHDN pin to V . The LT3008

IN

NC (Pin 8, TSOT-23 Package Only): No Connect. Pin 8

does not function if the SHDN pin is not connected. The

SHDN pin cannot be driven below GND unless tied to the

IN pin. If the SHDN pin is driven below GND while IN is

powered, the output will turn on. SHDN pin logic cannot

be referenced to a negative rail.

is an NC pin in the TSOT-23 package. This pin is not tied

to any internal circuitry. It may be ﬂoated, tied to V or

IN

tied to GND.

Exposed Pad (Pin 7, DFN Package Only): Ground. The

Exposed Pad (backside) of the DFN package is an electri-

cal connection to GND. To ensure optimum performance,

solder Pin 7 to the PCB and tie directly to Pin 6.

GND (Pins 2, 3, 4/Pin 6): Ground. Connect the bottom

of the resistor divider that sets output voltage directly to

GND for the best regulation.

SENSE (Pin 7/Pin 1): Sense. For ﬁxed voltage versions

of the LT3008 (LT3008-1.2, LT3008-1.5, LT3008-1.8,

LT3008-2.5, LT3008-3.3, LT3008-5), the SENSE pin is

the input to the error ampliﬁer. Optimum regulation is

obtained at the point where the SENSE pin is connected

to the OUT pin of the regulator. In critical applications,

small voltage drops are caused by the resistance (RP) of

PC traces between the regulator and the load. These may

be eliminated by connecting the SENSE pin to the output

at the load as shown in Figure 1 (Kelvin Sense Connec-

tion). Note that the voltage drop across the external PC

traces add to the dropout voltage of the regulator. The

SENSE pin bias current is 1μA at the nominal rated out-

put voltage. The SENSE pin can be pulled below ground

(as in a dual supply system where the regulator load is

returned to a negative supply) and still allow the device

to start and operate.

IN (Pin 5/Pin 4): Input. The IN pin supplies power to the

device. The LT3008 requires a bypass capacitor at IN if

the device is more than six inches away from the main

input ﬁlter capacitor. In general, the output impedance of

a battery rises with frequency, so it is advisable to include

a bypass capacitor in battery-powered circuits. A bypass

capacitor in the range of 0.1μF to 10μF will sufﬁce. The

LT3008 withstands reverse voltages on the IN pin with re-

spect to ground and the OUT pin. In the case of a reversed

input, which occurs with a battery plugged in backwards,

the LT3008 acts as if a blocking diode is in series with its

input. No reverse current ﬂows into the LT3008 and no

reverse voltage appears at the load. The device protects

both itself and the load.

OUT (Pin 6/Pins 2, 3): Output. This pin supplies power

to the load. Use a minimum output capacitor of 2.2μF

to prevent oscillations. Large load transient applications

require larger output capacitors to limit peak voltage tran-

sients. See the Applications Information section for more

information on output capacitance and reverse-output

characteristics.

R

P

IN

OUT

LT3008

+

SHDN SENSE

LOAD

V

IN

GND

ADJ (Pin 7/Pin 1): Adjust. This pin is the error ampliﬁer’s

inverting terminal. Its 400pA typical input bias current

ﬂows out of the pin (see curve of ADJ Pin Bias Current vs

Temperature in the Typical Performance Characteristics

R

P

3008 F01

Figure 1. Kelvin Sense Connection

3008fa

11

LT3008 Series

APPLICATIONS INFORMATION

The LT3008 is a low dropout linear regulator with ultra-

low quiescent current and shutdown. Quiescent current is

extremely low at 3μA and drops well below 1μA in shut-

down. The device supplies up to 20mA of output current.

Dropout voltage at 20mA is typically 300mV. The LT3008

incorporatesseveralprotectionfeatures,makingitidealfor

useinbattery-poweredsystems.Thedeviceprotectsitself

against both reverse-input and reverse-output voltages.

In battery backup applications, where a backup battery

holds up the output when the input is pulled to ground,

the LT3008 acts as if a blocking diode is in series with its

output and prevents reverse current ﬂow. In applications

where the regulator load returns to a negative supply, the

output can be pulled below ground by as much as 50V

without affecting start-up or normal operation.

current and to insure stability under minimum load condi-

tions. In shutdown, the output turns off and the divider

current is zero. Curves of ADJ Pin Voltage vs Temperature

and ADJ Pin Bias Current vs Temperature appear in the

Typical Performance Characteristics.

Speciﬁcations for output voltages greater than 0.6V are

proportional to the ratio of the desired output voltage to

0.6V:V /0.6V.Forexample,loadregulationforanoutput

OUT

current change of 100μA to 20mA is –0.5mV typical at

V

OUT

= 0.6V. At V

= 5V, load regulation is:

OUT

5V

0.6V

• (−0.5mV) = −4.17mV

Table 1 shows resistor divider values for some com-

mon output voltages with a resistor divider current of

about 1μA.

Adjustable Operation

The LT3008 has an output voltage range of 0.6V to 44.5V.

Figure2showsthatoutputvoltageissetbytheratiooftwo

external resistors. The IC regulates the output to maintain

the ADJ pin voltage at 600mV referenced to ground. The

current in R1 equals 600mV/R1 and the current in R2 is

the current in R1 minus the ADJ pin bias current. The

ADJ pin bias current, typically 400pA at 25°C, ﬂows out

of the pin. Calculate the output voltage using the formula

in Figure 2. An R1 value of 619k sets the divider current

to 0.97μA. Do not make R1’s value any greater than 619k

to minimize output voltage errors due to the ADJ pin bias

Table 1. Output Voltage Resistor Divider Values

V

R1

R2

OUT

1V

1.2V

1.5V

1.8V

2.5V

3V

604k

590k

619k

590k

402k

590k

887k

1.18M

1.87M

2.37M

2.8M

4.32M

3.3V

5V

V

IN

OUT

ADJ

OUT

V

= 600mV • (1 + R2/R1) – (I

= 600mV

= 0.4nA at 25°C

• R2)

ADJ

OUT

ADJ

V

IN

LT3008

R2

R1

I

ADJ

OUTPUT RANGE = 0.6V to 44.5V

SHDN

GND

3008 F02

Figure 2. Adjustable Operation

3008fa

12

LT3008 Series

APPLICATIONS INFORMATION

Because the ADJ pin is relatively high impedance (de-

pendingontheresistordividerused),straycapacitances

atthispinshouldbeminimized.Specialattentionshould

be given to any stray capacitances that can couple ex-

ternal signals onto the ADJ pin, producing undesirable

output transients or ripple.

Give extra consideration to the use of ceramic capacitors.

Manufacturers make ceramic capacitors with a variety of

dielectrics,eachwithdifferentbehavioracrosstemperature

and applied voltage. The most common dielectrics are

speciﬁed with EIA temperature characteristic codes of

Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics

provide high C-V products in a small package at low cost,

but exhibit strong voltage and temperature coefﬁcients as

shown in Figures 3 and 4. When used with a 5V regulator,

a 16V 10μF Y5V capacitor can exhibit an effective value

as low as 1μF to 2μF for the DC bias voltage applied and

over the operating temperature range. The X5R and

X7R dielectrics yield more stable characteristics and are

more suitable for use as the output capacitor. The X7R

type has better stability across temperature, while the

X5R is less expensive and is available in higher values.

One must still exercise care when using X5R and X7R

capacitors;theX5RandX7Rcodesonlyspecifyoperating

temperature range and maximum capacitance change

over temperature. Capacitance change due to DC bias

with X5R and X7R capacitors is better than Y5V and Z5U

capacitors, but can still be signiﬁcant enough to drop

capacitor values below appropriate levels. Capacitor DC

bias characteristics tend to improve as component case

size increases, but expected capacitance at operating

voltage should be veriﬁed.

Extra care should be taken in assembly when using high

valuedresistors.Smallamountsofboardcontamination

canleadtosigniﬁcantshiftsinoutputvoltage.Appropriate

post-assembly board cleaning measures should be

implemented to prevent board contamination. If the

board is to be subjected to humidity cycling or if board

cleaningmeasurescannotbeguaranteed,consideration

shouldbegiventousingresistorsanorderofmagnitude

smaller than in Table 1 to prevent contamination from

causing unwanted shifts in the output voltage. A ﬁxed

voltage option in the LT3008 series will not need these

special considerations.

Output Capacitance and Transient Response

The LT3008 is stable with a wide range of output capaci-

tors.TheESRoftheoutputcapacitoraffectsstability,most

notably with small capacitors. Use a minimum output

capacitor of 2.2μF with an ESR of 3Ω or less to prevent

oscillations.TheLT3008isamicropowerdeviceandoutput

loadtransientresponseisafunctionofoutputcapacitance.

Larger values of output capacitance decrease the peak

deviations and provide improved transient response for

larger load current changes.

Voltage and temperature coefﬁcients are not the only

sources of problems. Some ceramic capacitors have a

40

20

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10μF

0

X5R

0

–20

–40

Y5V

–60

Y5V

–80

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10μF

–100

0

8

12 14

–50

25

50

75

100 125

2

4

6

10

16

–25

0

DC BIAS VOLTAGE (V)

TEMPERATURE (°C)

3008 F03

3008 F04

Figure 3. Ceramic Capacitor DC Bias Characteristics

Figure 4. Ceramic Capacitor Temperature Characteristics

3008fa

13

LT3008 Series

APPLICATIONS INFORMATION

piezoelectric response. A piezoelectric device generates

voltage across its terminals due to mechanical stress,

similar to the way a piezoelectric accelerometer or micro-

phone works. For a ceramic capacitor, the stress can be

induced by vibrations in the system or thermal transients.

The resulting voltages produced can cause appreciable

amounts of noise, especially when a ceramic capacitor is

used for noise bypassing. A ceramic capacitor produced

Figure 5’s trace in response to light tapping from a pencil.

Similar vibration induced behavior can masquerade as

increased output voltage noise.

GND pin current is found by examining the GND Pin Cur-

rent curves in the Typical Performance Characteristics

section. Power dissipation is equal to the sum of the two

components listed prior.

TheLT3008regulatorhasinternalthermallimitingdesigned

to protect the device during overload conditions. For con-

tinuous normal conditions, do not exceed the maximum

junction temperature rating of 125°C. Carefully consider

all sources of thermal resistance from junction to ambi-

ent including other heat sources mounted in proximity to

the LT3008. For surface mount devices, heat sinking is

accomplished by using the heat spreading capabilities of

the PC board and its copper traces. Copper board stiffen-

ers and plated through-holes can also be used to spread

the heat generated by power devices.

V

C

LOAD

= 0.6V

= 22μF

= 10μA

OUT

I

V

OUT

The following tables list thermal resistance for several

different board sizes and copper areas. All measurements

were taken in still air on 3/32" FR-4 two-layer boards with

one ounce copper.

500μV/DIV

3008 F05

100ms/DIV

PCB layers, copper weight, board layout and thermal vias

affect the resultant thermal resistance. Although Tables 2

and3providethermalresistancenumbersfor2-layerboards

with 1 ounce copper, modern multilayer PCBs provide bet-

ter performance than found in these tables. For example,

Figure 5. Noise Resulting from Tapping

on a Ceramic Capacitor

Thermal Considerations

Table 2: Measured Thermal Resistance for DC Package

COPPER AREA

The LT3008’s maximum rated junction temperature of

125°Climitsitspower-handlingcapability.Twocomponents

comprise the power dissipated by the device:

BOARD

AREA

THERMAL RESISTANCE

TOPSIDE*

BACKSIDE

(JUNCTION-TO-AMBIENT)

2

2500mm

65°C/W

70°C/W

75°C/W

80°C/W

85°C/W

1. Output current multiplied by the input/output voltage

2

1000mm

2500mm

differential: I

• (V – V

)

OUT

IN

OUT

2

225mm

2500mm

2. GND pin current multiplied by the input voltage:

• V

2

100mm

2500mm

I

GND

IN

2

50mm

2500mm

*Device is mounted on the topside.

3008fa

14

LT3008 Series

APPLICATIONS INFORMATION

So,

Table 3: Measured Thermal Resistance for TSOT-23 Package

COPPER AREA

P = 20mA(12.6V – 3.3V) + 0.3mA(12.6V) = 189.8mW

BOARD

AREA

THERMAL RESISTANCE

(JUNCTION-TO-AMBIENT)

TOPSIDE*

BACKSIDE

The thermal resistance ranges from 65°C/W to 85°C/W

dependingonthecopperarea.So,thejunctiontemperature

rise above ambient approximately equals:

2

2500mm

65°C/W

67°C/W

70°C/W

75°C/W

85°C/W

2

1000mm

2500mm

2

225mm

2500mm

0.1898W(75°C/W) = 14.2°C

2

100mm

2500mm

2

50mm

2500mm

The maximum junction temperature equals the maximum

junctiontemperatureriseaboveambientplusthemaximum

ambient temperature or:

*Device is mounted on the topside.

a 4-layer, 1 ounce copper PCB board with 3 thermal vias

from the DFN exposed backside or the 3 fused TSOT-23

GND pins to inner layer GND planes achieves 45°C/W

thermalresistance. Democircuit DC1388A’sboardlayout

achieves this 45°C/W performance. This is approximately

a 30% improvement over the lowest numbers shown in

Tables 2 and 3.

T

= 85°C + 14.2°C = 99.2°C

J(MAX)

Protection Features

The LT3008 incorporates several protection features that

make it ideal for use in battery-powered circuits. In ad-

dition to the normal protection features associated with

monolithicregulators,suchascurrentlimitingandthermal

limiting, the device also protects against reverse-input

voltages, reverse-output voltages and reverse output-to-

input voltages.

Calculating Junction Temperature

Example: Given an output voltage of 3.3V, an input volt-

age range of 12V 5%, an output current range of 0mA

to 20mA and a maximum ambient temperature of 85°C,

what will the maximum junction temperature be for an

application using the DC package?

Current limit protection and thermal overload protec-

tion protect the device against current overload condi-

tions at the output of the device. For normal operation,

do not exceed a junction temperature of 125°C. The

typicalthermalshutdowncircuitrytemperaturethreshold

is 160°C.

The power dissipated by the device is equal to:

I

(V

– V ) + I

(V

)

OUT(MAX) IN(MAX)

OUT

GND IN(MAX)

where,

The IN pin withstands reverse voltages of 50V. The device

limits current ﬂow to less than 30μA (typically less than

1μA) and no negative voltage appears at OUT. The device

protects both itself and the load against batteries that are

plugged in backwards.

I

= 20mA

= 12.6V

OUT(MAX)

V

IN(MAX)

I

at (I = 20mA, V = 12.6V) = 0.3mA

OUT IN

GND

3008fa

15

LT3008 Series

APPLICATIONS INFORMATION

The SHDN pin cannot be driven below GND unless tied to

the IN pin. If the SHDN pin is driven below GND while IN

is powered, the output will turn on. SHDN pin logic cannot

be referenced to a negative rail.

to ground, pulled to some intermediate voltage or is left

open circuit. Current ﬂow back into the output follows the

curve shown in Figure 6.

If the LT3008 IN pin is forced below the OUT pin or the

OUT pin is pulled above the IN pin, input current typically

drops to less than 1μA. This occurs if the LT3008 input is

connected to a discharged (low voltage) battery and either

a backup battery or a second regulator circuit holds up

the output. The state of the SHDN pin has no effect in the

reverse current if OUT is pulled above IN.

The LT3008 incurs no damage if OUT is pulled below

ground. If IN is left open circuit or grounded, OUT can be

pulled below ground by 50V. No current ﬂows from the

pass transistor connected to OUT. However, current ﬂows

in (but is limited by) the resistor divider that sets output

voltage. Current ﬂows from the bottom resistor in the

divider and from the ADJ pin’s internal clamp through the

top resistor in the divider to the external circuitry pulling

OUT below ground. If IN is powered by a voltage source,

OUT sources current equal to its current limit capability

and the LT3008 protects itself by thermal limiting if neces-

sary. In this case, grounding the SHDN pin turns off the

LT3008 and stops OUT from sourcing current.

100

90

80

70

60

50

40

30

20

10

0

ADJ CURRENT

The LT3008 incurs no damage if the ADJ pin is pulled

above or below ground by 50V. If IN is left open circuit or

grounded, ADJ acts like a 100k resistor in series with a

diode when pulled above or below ground.

OUT CURRENT

0

1

2

3

4

5

6

7

8

9

10

OUTPUT AND ADJ VOLTAGE (V)

In circuits where a backup battery is required, several

different input/output conditions can occur. The output

voltage may be held up while the input is either pulled

3008 F06

Figure 6. Reverse-Output Current

3008fa

16

LT3008 Series

TYPICAL APPLICATIONS

Keep-Alive Power Supply

NO PROTECTION

DIODES NEEDED!

3.3V

V

IN

OUT

LT3008-3.3

12V

1μF

2.2μF

LOAD:

SHDN SENSE

SYSTEM MONITOR,

VOLATILE MEMORY, ETC.

GND

3009 TA02

Last-Gasp Circuit

LINE POWER

V

LINE

SENSE

12V TO 15V

D

CHARGE

LINE

INTERRUPT

DETECT

R

LIMIT

TO

5V

PWR

FAULT

MONITORING

CENTER

IN

OUT

LT3008-5

GND

SUPERCAP

1μF

2.2μF

3008 TA03

SHDN SENSE

GND

3008fa

17

LT3008 Series

PACKAGE DESCRIPTION

DC Package

6-Lead Plastic DFN (2mm × 2mm)

(Reference LTC DWG # 05-08-1703)

R = 0.115

TYP

0.56 p 0.05

(2 SIDES)

0.38 p 0.05

4

6

0.675 p 0.05

2.50 p 0.05

0.61 p 0.05

(2 SIDES)

2.00 p 0.10

(4 SIDES)

1.15 p 0.05

PIN 1 BAR

TOP MARK

(SEE NOTE 6)

PIN 1

PACKAGE

OUTLINE

CHAMFER OF

EXPOSED PAD

(DC6) DFN 1103

3

1

0.25 p 0.05

0.50 BSC

0.75 p 0.05

0.200 REF

1.37 p 0.05

(2 SIDES)

1.42 p 0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)

2. DRAWING NOT TO SCALE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

3008fa

18

LT3008 Series

PACKAGE DESCRIPTION

TS8 Package

8-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1639 Rev Ø)

2.90 BSC

(NOTE 4)

0.52

MAX

0.65

REF

1.22 REF

1.50 – 1.75

(NOTE 4)

2.80 BSC

1.4 MIN

3.85 MAX 2.62 REF

PIN ONE ID

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.22 – 0.36

8 PLCS (NOTE 3)

0.65 BSC

0.80 – 0.90

0.20 BSC

DATUM ‘A’

0.01 – 0.10

1.00 MAX

0.30 – 0.50 REF

1.95 BSC

0.09 – 0.20

(NOTE 3)

TS8 TSOT-23 0802

NOTE:

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

3008fa

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 representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

19

LT3008 Series

TYPICAL APPLICATION

Low Duty Cycle Applications

Average Power Savings for Low Duty Cycle Applications

0mA to 10mA Pulsed Load, IN = 12V

100

90

80

70

60

3.3V

V

IN

OUT

LT3008-3.3

12V

1μF

2.2μF

LOW DUTY CYCLE

PULSED LOAD

0mA TO 10mA

SHDN SENSE

GND

100μA I

Q

50

40

30

20

10

0

3008 TA04a

30μA I

Q

10μA I

Q

1

10

0.1

DUTY CYCLE (%)

3008 TA04b

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

LT1761

100mA, Low Noise Micropower LDO V : 1.8V to 20V, V

= 1.22V, V = 0.3V, I = 20μA, I < 1μA, Low Noise: < 20μV

,

IN

OUT

DO

Q

SD

RMS

Stable with 1μF Ceramic Capacitors, ThinSOT^TMPackage

LT1762

LT1763

150mA, Low Noise Micropower LDO V : 1.8V to 20V, V

= 1.22V, V = 0.3V, I = 25μA, I < 1μA, Low Noise: < 20μV

DO Q SD

IN

OUT

MS8 Package

500mA, Low Noise Micropower LDO V : 1.8V to 20V, V

= 1.22V, V = 0.3V, I = 30μA, I < 1μA, Low Noise: < 20μV

DO Q SD

IN

S8 Package

LT1764/LT1764A 3A, Low Noise, Fast Transient

Response LDOs

V : 2.7V to 20V, V

= 1.21V, V = 0.34V, I = 1mA, I < 1μA, Low Noise: < 40μV

,

IN

DO

Q

SD

RMS

LT1764A Version Stable with Ceramic Capacitors, DD and TO220-5 Packages

LT1962

300mA, Low Noise Micropower LDO V : 1.8V to 20V, V

= 1.22V, V = 0.27V, I = 30μA, I < 1μA,

OUT(MIN) DO Q SD

RMS

IN

Low Noise: < 20μV

, MS8 Package

LT1963/LT1963A 1.5A, Low Noise, Fast Transient

Response LDOs

V : 2.1V to 20V, V

= 1.21V, V = 0.34V, I = 1mA, I < 1μA,

OUT(MIN) DO Q SD

RMS

IN

Low Noise: < 40μV

, LT1963A Version Stable with Ceramic Capacitors, DD, TO220-5,

SOT223 and S8 Packages

LT3009

LT3020

20mA, 3μA I Micropower LDO

V : 1.6V to 20V, Low I : 3μA, V = 0.28V, 2mm × 2mm DFN and SC70-8 Packages

Q

IN

Q

DO

100mA, Low Voltage VLDO

V : 0.9V to 10V, V

= 0.20V, V = 0.15V, I = 120μA, I < 1μA, 3mm × 3mm DFN

DO Q SD

IN

OUT(MIN)

and MS8 Packages

LT3021

500mA, Low Voltage VLDO

V : 0.9V to 10V, V

= 0.20V, V = 0.16V, I = 120μA, I < 3μA, 5mm × 5mm DFN

DO Q SD

IN

OUT(MIN)

and SO8 Packages

LT3080/ LT3080-1 1.1A, Parallelable, Low Noise,

Low Dropout Linear Regulator

300mV Dropout Voltage (2-Supply Operation), Low Noise: 40μV

, V : 1.2V to 36V,

RMS IN

V

: 0V to 35.7V, Current-Based Reference with 1-Resistor V

Set; Directly Parallelable

OUT

(No Op Amp Required), Stable with Ceramic Caps, TO-220, SOT-223, MSOP and 3mm ×

3mm DFN Packages; LT3080-1 Version Has Integrated Internal Ballast Resistor

LT3085

500mA, Parallelable, Low Noise,

Low Dropout Linear Regulator

275mV Dropout Voltage (2-Supply Operation), Low Noise: 40μV

, V : 1.2V to 36V,

RMS IN

V

: 0V to 35.7V, Current-Based Reference with 1-Resistor V

Set; Directly Parallelable

OUT

(No Op Amp Required), Stable with Ceramic Caps, MSOP-8 and 2mm × 3mm DFN Packages

ThinSOT is a trademark of Linear Technology Corporation.

3008fa

LT 0509 REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

20

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com


型号：	LT3008EDC-1.2PBF
厂家：	Linear
描述：	3μA IQ, 20mA, 45V Low Dropout Linear Regulators 3μA IQ ， 20mA时， 45V低压降线性稳压器稳压器
文件：	总20页 (文件大小：449K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT3008EDC-1.2PBF [Linear]

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