LT1962EMS8-1.8#TRPBF

LT1962 Series

300mA, Low Noise,

Micropower

LDO Regulators

FeaTures

DescripTion

TheLT^®1962seriesaremicropower,lownoise,lowdropout

regulators. The devices are capable of supplying 300mA

of output current with a dropout voltage of 270mV. De-

signed for use in battery-powered systems, the low 30µA

quiescent current makes them an ideal choice. Quiescent

current is well controlled; it does not rise in dropout as it

does with many other regulators.

n

Low Noise: 20µV

Output Current: 300mA

(10Hz to 100kHz)

RMS

n

Low Quiescent Current: 30µA

Wide Input Voltage Range: 1.8V to 20V

Low Dropout Voltage: 270mV

Very Low Shutdown Current: < 1µA

No Protection Diodes Needed

Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V

Adjustable Output from 1.22V to 20V

Stable with 3.3µF Output Capacitor

Stable with Aluminum, Tantalum or

Ceramic Capacitors

A key feature of the LT1962 regulators is low output noise.

With the addition of an external 0.01µF bypass capacitor,

output noise drops to 20µV

bandwidth. The LT1962 regulators are stable with output

capacitors as low as 3.3µF. Small ceramic capacitors can

be used without the series resistance required by other

regulators.

over a 10Hz to 100kHz

RMS

n

Reverse Battery Protection

No Reverse Current

Overcurrent and Overtemperature Protected

8-Lead MSOP Package

Internalprotectioncircuitryincludesreversebatteryprotec-

tion, current limiting, thermal limiting and reverse current

protection.Thepartscomeinfixedoutputvoltagesof1.5V,

1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable device

with a 1.22V reference voltage. The LT1962 regulators are

available in the 8-lead MSOP package.

applicaTions

n

Cellular Phones

n

Battery-Powered Systems

n

Noise-Sensitive Instrumentation Systems

L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

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

owners.

Typical applicaTion

Dropout Voltage

400

3.3V Low Noise Regulator

350

300

250

200

150

100

50

3.3V AT 300mA

20µV NOISE

IN

OUT

V

IN

RMS

+

3.7V TO

20V

1µF

SENSE

10µF

LT1962-3.3

0.01µF

SHDN

GND

BYP

1962 TA01

0

50

100

150

200

250

300

LOAD CURRENT (mA)

1962 TA02

1962fba

1

For more information www.linear.com/LT1962

LT1962 Series

absoluTe MaxiMuM raTings

pin conFiguraTion

(Note 1)

IN Pin Voltage ......................................................... 20V

OUT Pin Voltage...................................................... 20V

Input to Output Differential Voltage (Note 2)........... 20V

SENSE Pin Voltage.................................................. 20V

ADJ Pin Voltage ........................................................ 7V

BYP Pin Voltage..................................................... 0.6V

SHDN Pin Voltage ................................................... 20V

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

Operating Junction Temperature Range

TOP VIEW

OUT

SENSE/ADJ*

BYP

1

2

3

4

8 IN

7 NC

6 NC

5 SHDN

GND

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

JMAX

= 150°C, θ = 125°C/W

JA

*PIN 2: SENSE FOR LT1962-1.5/LT1962-1.8/

LT1962-2.5/LT1962-3/LT1962-3.3/

LT1962-5. ADJ FOR LT1962

(Note 3) ............................................. –40°C to 125°C

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

Lead Temperature (Soldering, 10 sec)...................300°C

orDer inForMaTion

LEAD FREE FINISH

LT1962EMS8#PBF

TAPE AND REEL

PART MARKING*

LTML

PACKAGE DESCRIPTION

TEMPERATURE RANGE

–40°C to 125°C

LT1962EMS8#TRPBF

LT1962IMS8#TRPBF

8-Lead Plastic MSOP

LT1962IMS8#PBF

LTML

LT1962EMS8-1.5#PBF

LT1962EMS8-1.8#PBF

LT1962EMS8-2.5#PBF

LT1962EMS8-3#PBF

LT1962EMS8-3.3#PBF

LT1962EMS8-5#PBF

LT1962EMS8-1.5#TRPBF

LT1962EMS8-1.8#TRPBF

LT1962EMS8-2.5#TRPBF

LT1962EMS8-3#TRPBF

LT1962EMS8-3.3#TRPBF

LT1962EMS8-5#TRPBF

LTSZ

LTTA

LTPT

LTPQ

LTPS

LTPR

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

Consult LTC Marketing for information on nonstandard lead based finish parts.

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/

The ldenotes the specifications which apply over the full operating

elecTrical characTerisTics

temperature range, otherwise specifications are at T_A= 25°C. (Note 3)

PARAMETER

CONDITIONS

LT1962

MIN

TYP

MAX

UNITS

l

Minimum Operating Voltage

I

= 300mA (Notes 4, 12)

1.8

2.3

V

LOAD

Regulated Output Voltage

(Notes 4, 5)

LT1962-1.5

V

= 2V, I

= 1mA

LOAD

1.485

1.462

1.500

1.515

1.538

V

IN

2.5V < V < 20V, 1mA < I

< 300mA

IN

LOAD

LT1962-1.8

LT1962-2.5

LT1962-3

V

= 2.3V, I

= 1mA

LOAD

1.782

1.755

1.800

1.818

1.845

V

IN

2.8V < V < 20V, 1mA < I

IN

V

= 3V, I

= 1mA

LOAD

2.475

2.435

2.500

2.525

2.565

V

IN

3.5V < V < 20V, 1mA < I

IN

V

= 3.5V, I

= 1mA

LOAD

2.970

2.925

3.000

3.030

3.075

V

IN

4V < V < 20V, 1mA < I

< 300mA

IN

LOAD

LT1962-3.3

LT1962-5

V

= 3.8V, I

= 1mA

LOAD

3.267

3.220

3.300

3.333

3.380

V

IN

4.3V < V < 20V, 1mA < I

< 300mA

IN

LOAD

V

= 5.5V, I

= 1mA

LOAD

4.950

4.875

5.000

5.050

5.125

V

IN

6V < V < 20V, 1mA < I

< 300mA

IN

LOAD

1962fba

2

For more information www.linear.com/LT1962

LT1962 Series

elecTrical characTerisTics ^Theldenotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. (Note 3)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ADJ Pin Voltage

(Notes 4, 5)

LT1962

V

= 2V, I

= 1mA

LOAD

1.208

1.190

1.220

1.232

1.250

V

IN

l

2.3V < V < 20V, 1mA < I

< 300mA

LOAD

IN

l

Line Regulation

LT1962-1.5

LT1962-1.8

LT1962-2.5

LT1962-3

∆V = 2V to 20V, I

IN

= 1mA

1

5

mV

IN

LOAD

∆V = 2.3V to 20V, I

= 1mA

LOAD

∆V = 3V to 20V, I

= 1mA

IN

LOAD

∆V = 3.5V to 20V, I

= 1mA

IN

LOAD

LT1962-3.3

LT1962-5

∆V = 3.8V to 20V, I

= 1mA

IN

∆V = 5.5V to 20V, I

IN

LT1962 (Note 4) ∆V = 2V to 20V, I

= 1mA

IN

LOAD

Load Regulation

LT1962-1.5

LT1962-1.8

LT1962-2.5

LT1962-3

V

= 2.5V, ∆I

= 1mA to 300mA

3

8

mV

IN

LOAD

l

15

V

= 2.8V, ∆I

= 1mA to 300mA

4

9

18

mV

IN

LOAD

V

= 3.5V, ∆I

= 1mA to 300mA

5

12

25

mV

IN

LOAD

V

= 4V, ∆I

= 1mA to 300mA

7

15

30

mV

IN

LOAD

LT1962-3.3

LT1962-5

V

= 4.3V, ∆I

= 1mA to 300mA

7

17

33

mV

IN

LOAD

V

= 6V, ∆I

= 1mA to 300mA

12

2

25

50

mV

IN

LOAD

LT1962 (Note 4)

V

= 2.3V, ∆I

= 1mA to 300mA

6

12

mV

IN

LOAD

Dropout Voltage

I

= 10mA

0.10

0.15

0.18

0.27

0.15

0.21

V

LOAD

V

= V

OUT(NOMINAL)

IN

(Notes 6, 7, 12)

I

= 50mA

0.20

0.28

V

LOAD

I

= 100mA

0.24

0.33

V

LOAD

I

= 300mA

0.33

0.43

V

LOAD

l

GND Pin Current

I

= 0mA

30

65

1.1

2

75

120

1.6

3

µA

mA

LOAD

V

= V

= 1mA

IN

OUT(NOMINAL)

(Notes 6, 8)

= 50mA

= 100mA

= 300mA

8

12

Output Voltage Noise

ADJ Pin Bias Current

Shutdown Threshold

C

= 10µF, C

= 0.01µF, I

= 300mA, BW = 10Hz to 100kHz

20

30

µV

RMS

OUT

BYP

LOAD

(Notes 4, 9)

100

2

nA

l

V

= Off to On

= On to Off

0.8

0.65

V

OUT

0.25

SHDN Pin Current

(Note 10)

V

SHDN

V

SHDN

= 0V

= 20V

0.01

1

0.5

5

µA

Quiescent Current in Shutdown

Ripple Rejection

V

= 6V, V

= 0V

SHDN

0.1

65

1

µA

dB

IN

– V

= 1.5V (Avg), V

= 0.5V , f = 120Hz,

P-P RIPPLE

55

IN

OUT

RIPPLE

I

= 300mA

LOAD

Current Limit

V

= 7V, V

= 0V

700

mA

IN

OUT

OUT(NOMINAL)

l

= V

+ 1V, ∆V

= –0.1V

320

OUT

Input Reverse Leakage Current

V

= –20V, V

= 0V

OUT

1

mA

IN

1962fba

3

For more information www.linear.com/LT1962

LT1962 Series

elecTrical characTerisTics

The ldenotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T_A= 25°C. (Note 3)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reverse Output Current

(Note 11)

LT1962-1.5

LT1962-1.8

LT1962-2.5

LT1962-3

V

= 1.5V, V < 1.5V

10

5

20

10

µA

OUT

IN

= 1.8V, V < 1.8V

IN

= 2.5V, V < 2.5V

IN

= 3V, V < 3V

IN

LT1962-3.3

LT1962-5

= 3.3V, V < 3.3V

IN

= 5V, V < 5V

IN

LT1962 (Note 4)

= 1.22V, V < 1.22V

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.

Note 6: To satisfy requirements for minimum input voltage, the LT1962

(adjustable version) is tested and specified for these conditions with an

external resistor divider (two 250k resistors) for an output voltage of

2.44V. The external resistor divider will add a 5µA DC load on the output.

Note 2: Absolute maximum input to output differential voltage cannot

be achieved with all combinations of rated IN pin and OUT pin voltages.

With the IN pin at 20V, the OUT pin may not be pulled below 0V. The total

measured voltage from in to out can not exceed 20V.

Note 7: Dropout voltage is the minimum input to output voltage differential

needed to maintain regulation at a specified output current. In dropout, the

output voltage will be equal to: V – V

.

IN

DROPOUT

Note 8: GND pin current is tested with V = V

or V = 2.3V

IN

OUT(NOMINAL)

Note 3: The LT1962 is tested and specified under pulse load conditions

(whichever is greater) and a current source load. This means the device is

tested while operating in its dropout region. This is the worst-case GND

pin current. The GND pin current will decrease slightly at higher input

voltages.

Note 9: ADJ pin bias current flows into the ADJ pin.

Note 10: SHDN pin current flows into the SHDN pin. This current is

such that T ≈ T . The LT1962E is tested at T = 25°C and performance

J

A

is guaranteed from 0°C to 125°C. Performance of the LT1962E over the

full –40°C to 125°C operating temperature range is assured by design,

characterization, and correlation with statistical process controls. The

LT1962I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 4: The LT1962 (adjustable version) is tested and specified for these

conditions with the ADJ pin connected to the OUT pin.

Note 5: 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 maximum input voltage, the output current range must be

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

range must be limited.

included in the specification for GND pin current.

Note 11: Reverse output current is tested with the IN pin grounded and the

OUT pin forced to the rated output voltage. This current flows into the OUT

pin and out the GND pin.

Note 12: For the LT1962, LT1962-1.5 and LT1962-1.8 dropout voltage

will be limited by the minimum input voltage specification under some

output voltage/load conditions. See the curve of Minimum Input Voltage

in the Typical Performance Characteristics section. For other fixed voltage

versions of the LT1962, the minimum input voltage is limited by the

dropout voltage.

Typical perForMance characTerisTics

Typical Dropout Voltage

Guaranteed Dropout Voltage

Dropout Voltage

400

350

300

250

200

150

100

50

400

350

300

250

500

450

400

350

300

250

200

150

100

50

= TEST POINTS

T ≤ 125°C

J

I

= 300mA

L

T = 125°C

J

T ≤ 25°C

J

I

= 100mA

L

200

150

T = 25°C

J

I

L

= 50mA

I

L

= 10mA

100

50

0

I

L

= 1mA

0

–25

0

50

75 100 125

–50

25

50

100

200

0

250

300

150

0

50

150

200

250

300

100

OUTPUT CURRENT (mA)

TEMPERATURE (°C)

OUTPUT CURRENT (mA)

1962 G03

1962 G01

1962 G02

1962fba

4

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

Quiescent Current

LT1962-1.5 Output Voltage

LT1962-1.8 Output Voltage

50

45

40

35

30

25

20

15

10

5

1.532

1.524

1.516

1.508

1.500

1.492

1.484

1.476

1.468

1.836

1.827

1.818

1.809

1.800

1.791

1.782

1.773

1.764

I

= 1mA

I = 1mA

L

V

= 6V

IN

SHDN

L

= V

IN

R

= ∞, I = 0 (LT1962-1.5/-1.8

L

/2.5/-3/-3.3/-5)

= 250k, I = 5µA (LT1962)

R

L

0

–50

0

25

50

75 100 125

–50 –25

0

25

50

75

100 125

–50 –25

0

25

50

75

100 125

–25

TEMPERATURE (°C)

1962 G04

1962 G05

1962 G06

LT1962-2.5 Output Voltage

LT1962-3 Output Voltage

LT1962-3.3 Output Voltage

2.54

2.53

2.52

2.51

2.50

2.49

2.48

2.47

2.46

3.060

3.045

3.030

3.015

3.000

2.985

2.970

2.955

2.940

3.360

3.345

3.330

3.315

3.300

3.285

3.270

3.255

3.240

I

= 1mA

I

= 1mA

I = 1mA

L

–25

0

50

75 100 125

–25

0

50

75 100 125

–25

0

50

75 100 125

–50

25

–50

25

–50

25

TEMPERATURE (°C)

1962 G07

1962 G08

1962 G09

LT1962-5 Output Voltage

LT1962 ADJ Pin Voltage

LT1962-1.5 Quiescent Current

5.100

5.075

5.050

5.025

5.000

4.975

4.950

4.925

4.900

1.240

1.235

1.230

1.225

1.220

1.215

1.210

1.205

1.200

800

700

600

500

400

300

200

100

0

I

= 1mA

I = 1mA

L

T = 25°C

L

J

L

R

= ∞

V

= 0V

8

SHDN

V

= V

5

SHDN

IN

–25

0

50

75 100 125

–25

0

50

75 100 125

–50

25

–50

25

0

1

2

3

4

6

7

9

10

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1962 G10

1962 G11

1962 G12

1962fba

5

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

LT1962-1.8 Quiescent Current

LT1962-2.5 Quiescent Current

LT1962-3 Quiescent Current

800

700

600

500

400

300

200

100

0

800

700

600

500

400

300

200

100

0

800

700

600

500

400

300

200

100

0

T = 25°C

J

R = ∞

L

J

L

J

L

R

= ∞

R

= ∞

V

= 0V

8

V

= 0V

8

V

= 0V

8

SHDN

V

= V

5

V

= V

5

V

= V

5

SHDN

IN

SHDN

IN

SHDN

IN

0

1

2

3

4

6

7

9

10

0

1

2

3

4

6

7

9

10

0

1

2

3

4

6

7

9

10

INPUT VOLTAGE (V)

1962 G13

1962 G14

1962 G15

LT1962-3.3 Quiescent Current

LT1962-5 Quiescent Current

LT1962 Quiescent Current

800

700

600

500

400

300

200

100

0

800

700

600

500

400

300

200

100

0

40

35

30

25

20

15

10

5

T = 25°C

J

R = 250k

L

J

L

J

R

= ∞

R

= ∞

L

V

= V

IN

SHDN

V

= 0V

9

V

= 0V

8

SHDN

V

= V

V

= V

SHDN

IN

SHDN

IN

V

= 0V

SHDN

0

1

2

3

4

5

6

7

9

10

0

1

2

3

4

5

6

7

8

10

0

2

4

6

8

10 12 14 16 18 20

INPUT VOLTAGE (V)

1962 G16

1962 G17

1962 G18

LT1962-1.5 GND Pin Current

LT1962-1.8 GND Pin Current

LT1962-2.5 GND Pin Current

1500

1250

1500

1250

1500

1250

T

= 25°C

= V

T = 25°C

J

T = 25°C

J

IN

V

= V

V

= V

IN SHDN

SHDN

IN

SHDN

OUT

*FOR V

= 1.5V

*FOR V

= 1.8V

*FOR V

= 2.5V

OUT

R

L

= 30Ω

L

R = 36Ω

L

I

= 50mA*

R

L

= 50Ω

L

1000

750

1000

750

1000

750

I

= 50mA*

I

= 50mA*

R

L

= 250Ω

L

500

250

0

500

250

0

500

250

0

I

= 10mA*

R

L

= 150Ω

R

L

= 1.5k

L

R

L

= 180Ω

R

L

= 1.8k

R

L

= 2.5k

L

I

= 10mA*

I

= 1mA*

I

= 10mA*

I

= 1mA*

I

= 1mA*

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

INPUT VOLTAGE (V)

1962 G19

1962 G20

1962 G21

1962fba

6

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

LT1962-3 GND Pin Current

LT1962-3.3 GND Pin Current

LT1962-5 GND Pin Current

1500

1250

1500

1250

1500

1250

T = 25°C

J

IN

*FOR V

J

IN

*FOR V

V

= V

V

= V

V

= V

IN SHDN

SHDN

OUT

SHDN

OUT

= 3V

= 3.3V

*FOR V

= 5V

OUT

R

L

= 66Ω

L

R

L

= 60Ω

L

R

L

= 100Ω

1000

750

1000

750

1000

750

L

I

= 50mA*

I

= 50mA*

I

= 50mA*

R

L

= 330Ω

= 10mA*

R = 500Ω

L

I = 10mA*

L

I

R

L

= 300Ω

= 10mA*

L

500

250

0

500

250

0

500

250

0

I

R

I

= 3k

R

I

= 3.3k

R = 5k

L

I = 1mA*

L

= 1mA*

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

INPUT VOLTAGE (V)

1962 G22

1962 G23

1962 G24

LT1962 GND Pin Current

LT1962-1.5 GND Pin Current

LT1962-1.8 GND Pin Current

1500

1250

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

T = 25°C

J

T = 25°C

J

IN

*FOR V

V

= V

V

= V

V

= V

IN SHDN

SHDN

OUT

IN

SHDN

OUT

= 1.22V

*FOR V

= 1.5V

*FOR V

= 1.8V

OUT

R

= 6Ω

L

R

= 5Ω

R

L

= 24.4Ω

L

I

L

= 300mA*

I

L

= 300mA*

I

= 50mA*

1000

750

R

= 9Ω

L

R

L

= 7.5Ω

I

L

= 200mA*

L

I

= 200mA*

R

L

= 15Ω

L

500

250

0

R

L

= 18Ω

L

I

= 100mA*

R

L

= 1.22k

R

L

= 122Ω

L

I

= 100mA*

I

= 1mA*

I

= 10mA*

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

INPUT VOLTAGE (V)

1962 G25

1962 G26

1962 G27

LT1962-2.5 GND Pin Current

LT1962-3 GND Pin Current

LT1962-3.3 GND Pin Current

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

T = 25°C

J

IN

*FOR V

J

IN

*FOR V

V

= V

V

= V

V

= V

IN SHDN

SHDN

OUT

= 2.5V

= 3V

*FOR V

= 3.3V

OUT

R

L

= 10Ω

L

R

L

= 11Ω

I

= 300mA*

R

L

= 8.33Ω

L

I

= 300mA*

I

= 300mA*

R

L

= 16.5Ω

R

L

= 15Ω

R

L

= 12.5Ω

L

I

= 200mA*

I

= 200mA*

I

= 200mA*

R

L

= 25Ω

L

R = 33Ω

L

I = 100mA*

L

R

L

= 30Ω

L

I

= 100mA*

I

= 100mA*

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

INPUT VOLTAGE (V)

1962 G28

1962 G29

1962 G30

1962fba

7

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

LT1962-5 GND Pin Current

LT1962 GND Pin Current

GND Pin Current vs I_LOAD

8

7

6

5

4

3

2

1

0

8

7

6

5

4

3

2

1

0

8

7

6

5

T = 25°C

J

T = 25°C

J

V

= V

+ 1V

OUT(NOMINAL)

IN

V

= V

V

= V

IN SHDN

IN

SHDN

OUT

*FOR V

= 5V

*FOR V

= 1.22V

OUT

R

L

= 16.7Ω

L

R

L

= 4.07Ω

L

I

= 300mA*

I

= 300mA*

R

L

= 25Ω

L

4

3

I

= 200mA*

R

L

= 6.1Ω

L

I

= 200mA*

R

L

= 50Ω

L

I

= 100mA*

2

1

0

R

L

= 12.2Ω

L

I

= 100mA*

50

100

200

0

1

2

3

4

5

6

7

8

9

10

0

1

2

3

4

5

6

7

8

9

10

0

250

300

150

INPUT VOLTAGE (V)

OUTPUT CURRENT (mA)

1962 G31

1962 G32

1962 G33

SHDN Pin Threshold (On-to-Off)

SHDN Pin Threshold (Off-to-On)

SHDN Pin Input Current

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

1.4

I

= 1mA

L

1.2

1.0

I

= 300mA

L

0.8

0.6

0.4

0.2

I

= 1mA

L

0

50

75 100 125

–50

0

TEMPERATURE (°C)

25

50

75 100 125

0

3

5

6

7

8

9

10

–50

0

25

TEMPERATURE (°C)

1

2

4

–25

SHDN PIN VOLTAGE (V)

1962 G34

1962 G35

1962 G36

SHDN Pin Input Current

ADJ Pin Bias Current

Current Limit

1.6

35

30

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

V

= 0V

V

= 20V

OUT

SHDN

1.4

1.2

25

20

15

10

5

1.0

0.8

0.6

0.4

0.2

0

–25

0

50

75 100 125

50

TEMPERATURE (°C)

100 125

–50

25

–50 –25

0

25

75

0

2

3

4

5

6

7

1

TEMPERATURE (°C)

INPUT VOLTAGE (V)

1962 G37

1962 G38

1962 G39

1962fba

8

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

Current Limit

Reverse Output Current

100

90

80

70

60

50

1.2

1.0

0.8

0.6

30

25

20

15

T = 25°C

J

V

= 7V

V

= 0V

IN

LT1962

IN

OUT

V

= 0V

= 1.22V (LT1962)

= 1.5V (LT1962-1.5)

= 1.8V (LT1962-1.8)

= 2.5V (LT1962-2.5)

= 3V (LT1962-3)

IN

OUT

CURRENT FLOWS

INTO OUTPUT PIN

V

= V

(LT1962)

OUT

ADJ

LT1962-1.5

LT1962-1.8

LT1962-2.5

= 3.3V (LT1962-3.3)

= 5V (LT1962-5)

LT1962-1.5/-1.8/-2.5/-3/-3.3/-5

40

30

LT1962-3

LT1962-3.3

0.4

0.2

0

10

5

20

10

0

LT1962-5

LT1962

0

1

2

3

4

5

6

7

8

9

10

50

TEMPERATURE (°C)

100 125

50

0

TEMPERATURE (°C)

100 125

–50 –25

25

75

–50 –25

0

25

75

OUTPUT VOLTAGE (V)

1962 G41

1962 G40

1962 G42

Input Ripple Rejection

Ripple Rejection

80

70

60

50

40

30

20

10

0

80

70

60

50

40

30

20

10

0

68

I

= 300mA

C

= 0.01µF

L

BYP

V

= V

+ 1V

IN

OUT(NOMINAL)

66

64

+ 50mV

C

RIPPLE

= 10µF

RMS

C

= 1000pF

BYP

= 0

BYP

62

60

58

56

54

C

OUT

C

= 100pF

BYP

C

= 3.3µF

OUT

I

= 300mA

L

V

= V

+ 1V

I

L

IN

= 300mA

= V

IN

OUT(NOMINAL)

+ 50mV

C

RIPPLE

V

+ 1V

OUT(NOMINAL)

RMS

= 10µF

+ 0.5V RIPPLE AT f = 120Hz

P-P

OUT

52

10

100

1k

10k

100k

1M

10

100

1k

10k

100k

1M

–25

0

50

75 100 125

–50

25

FREQUENCY (Hz)

TEMPERATURE (°C)

1962 G43

1962 G44

1962 G45

LT1962 Minimum Input Voltage

Load Regulation

Output Noise Spectral Density

10

1

5

0

2.50

2.25

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

0

I

C

= 300mA

V

= 1.22V

L

OUT

= 10µF

= 0

OUT

BYP

LT1962-1.8

LT1962

LT1962-1.5

LT1962-3

LT1962-3.3

LT1962-5

I

= 300mA

L

–5

LT1962-3.3

I

= 1mA

L

–10

LT1962-3

LT1962-2.5

LT1962

LT1962-2.5

LT1962-5

0.1

0.01

–15

–20

–25

LT1962-1.8

LT1962-1.5

V

= V

+ 1V

OUT(NOMINAL)

IN

∆I = 1mA TO 300mA

L

50

TEMPERATURE (°C)

100 125

–50 –25

0

25

75

10

100

1k

10k

100k

–50

0

25

50

75 100 125

–25

FREQUENCY (Hz)

TEMPERATURE (°C)

1962 G48

1962 G47

1962 G46

1962fba

9

For more information www.linear.com/LT1962

LT1962 Series

Typical perForMance characTerisTics

RMS Output Noise

vs Bypass Capacitor

RMS Output Noise

vs Load Current (10Hz to 100kHz)

Output Noise Spectral Density

10

1

160

140

120

100

80

160

140

120

100

80

I

= 300mA

= 10µF

C

= 10µF

I

= 300mA

= 10µF

L

OUT

L

OUT

C

BYP

C

BYP

= 0µF

C

= 0.01µF

f = 10Hz to 100kHz

LT1962-5

LT1962

C

= 1000pF

BYP

LT1962-5

LT1962-3

LT1962-3.3

LT1962-2.5

LT1962-1.8

LT1962-1.5

C

= 100pF

BYP

60

C

= 0.01µF

LT1962

BYP

0.1

0.01

40

LT1962

LT1962-5

20

LT1962

100

0

10

100

1k

10k

0.01

0.1

1

10

1000

10

100

1k

FREQUENCY (Hz)

10k

100k

LOAD CURRENT (mA)

C

(pF)

BYP

1962 G51

1962 G50

1962 G49

LT1962-5 10Hz to 100kHz

Output Noise (C_BYP= 0)

LT1962-5 10Hz to 100kHz

Output Noise (C_BYP= 100pF)

LT1962-5 10Hz to 100kHz

Output Noise (C_BYP= 1000pF)

V

OUT

100µV/DIV

V

OUT

100µV/DIV

1962 G52

1962 G54

1962 G53

C

I

= 10µF

1ms/DIV

C

I

= 10µF

OUT

L

1ms/DIV

C

I

= 10µF

1ms/DIV

OUT

L

OUT

L

= 300mA

LT1962-5 10Hz to 100kHz

Output Noise (C_BYP= 0.01µF)

LT1962-5 Transient Response

V

C

= 6V

V

C

= 6V

IN

0.4

0.10

= 10µF

= 0

= 10µF

OUT

BYP

OUT

BYP

0.2

0

0.05

0

= 0.01µF

V

OUT

–0.2

–0.4

–0.05

–0.10

100µV/DIV

300

200

100

0

300

200

100

0

1962 G55

C

L

= 10µF

1ms/DIV

OUT

I

= 300mA

0

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

0

50 100 150 200 250 300 350 400 450 500

TIME (ms)

TIME (µs)

1962 G56

1962 G57

1962fba

10

For more information www.linear.com/LT1962

LT1962 Series

pin FuncTions

OUT (Pin 1): Output. The output supplies power to the

load. A minimum output capacitor of 3.3µF is required

to prevent oscillations. Larger output capacitors will be

required for applications with large transient loads to limit

peak voltage transients. See the Applications Information

section for more information on output capacitance and

reverse output characteristics.

BYP (Pin 3): Bypass. The BYP pin is used to bypass the

referenceof the LT1962 to achieve low noise performance

from the regulator. The BYP pin is clamped internally to

0.6ꢀ (one ꢀ ). A small capacitor from the output to

BE

this pin will bypass the reference to lower the output volt-

age noise. A maximum value of 0.01µF can be used for

reducing output voltage noise to a typical 20µꢀ

over

RMS

a 10Hz to 100kHz bandwidth. If not used, this pin must

be left unconnected.

SENSE (Pin 2): Sense. For fixed voltage versions of the

LT1962(LT1962-1.5/LT1962-1.8/LT1962-2.5/LT1962-3/

LT1962-3.3/LT1962-5), the SENSE pin is the input to the

error amplifier. Optimum regulation will be obtained at the

point where the SENSE pin is connected to the OUT pin of

the regulator. In critical applications, small voltage drops

GND (Pin 4): Ground.

SHDN (Pin 5): Shutdown. The SHDN pin is used to put

the LT1962 regulators into a low power shutdown state.

The output will be off when the SHDN pin is pulled low.

The SHDN pin can be driven either by 5ꢀ logic or open-

collectorlogicwithapull-upresistor.Thepull-upresistoris

requiredtosupplythepull-upcurrentoftheopen-collector

gate, normally several microamperes, and the SHDN pin

current, typically 1µA. If unused, the SHDN pin must be

are caused by the resistance (R ) of PC traces between

P

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 Connection). Note that

the voltage drop across the external PC traces will add to

the dropout voltage of the regulator. The SENSE pin bias

current is 10µA at the nominal rated output voltage. The

SENSEpincanbepulledbelowground(asinadualsupply

system where the regulator load is returned to a negative

supply) and still allow the device to start and operate.

connected to ꢀ . The device will not function if the SHDN

IN

pin is not connected.

NC (Pins 6, 7): No Connect. These pins are not internally

connected. For improved power handling capabilities,

these pins can be connected to the PC board.

R

P

8

5

1

2

IN (Pin 8): Input. Power is supplied to the device through

the IN pin. A bypass capacitor is required on this pin 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 1µF to 10µF is sufficient.

The LT1962 regulators are designed to withstand reverse

voltages on the IN pin with respect to ground and the OUT

pin. In the case of a reverse input, which can happen if

a battery is plugged in backwards, the device will act as

if there is a diode in series with its input. There will be

no reverse current flow into the regulator and no reverse

voltage will appear at the load. The device will protect both

itself and the load.

IN

OUT

LT1962

+

SHDN SENSE

LOAD

V

IN

GND

4

R

P

1962 F01

Figure 1. Kelvin Sense Connection

ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the

input to the error amplifier. This pin is internally clamped

to 7ꢀ. It has a bias current of 30nA which flows into the

pin. The ADJ pin voltage is 1.22ꢀ referenced to ground

and the output voltage range is 1.22ꢀ to 20ꢀ.

1962fba

11

For more information www.linear.com/LT1962

LT1962 Series

applicaTions inForMaTion

TheLT1962seriesare300mAlowdropoutregulatorswith

micropowerquiescentcurrentandshutdown.Thedevices

are capable of supplying 300mA at a dropout voltage of

R1 plus the ADJ pin bias current. The ADJ pin bias cur-

rent, 30nA at 25°C, flows through R2 into the ADJ pin.

The output voltage can be calculated using the formula in

Figure 2. The value of R1 should be no greater than 250k

to minimize errors in the output voltage caused by the

ADJ pin bias current. Note that in shutdown the output is

turned off and the divider current will be zero.

300mꢀ. Output voltage noise can be lowered to 20µꢀ

RMS

over a 10Hz to 100kHz bandwidth with the addition of a

0.01µF reference bypass capacitor. Additionally, the refer-

ence bypass capacitor will improve transient response of

the regulator, lowering the settling time for transient load

conditions. The low operating quiescent current (30µA)

drops to less than 1µA in shutdown. In addition to the

low quiescent current, the LT1962 regulators incorporate

several protection features which make them ideal for use

in battery-powered systems. The devices are protected

against both reverse input and reverse output voltages.

In battery backup applications where the output can be

held up by a backup battery when the input is pulled to

ground, the LT1962-X acts like it has a diode in series with

its output and prevents reverse current flow. Additionally,

in dual supply applications where the regulator load is

returned to a negative supply, the output can be pulled

below ground by as much as 20ꢀ and still allow the device

to start and operate.

The adjustable device is tested and specified with the ADJ

pin tied to the OUT pin for an output voltage of 1.22ꢀ.

Specifications for output voltages greater than 1.22ꢀ will

be proportional to the ratio of the desired output voltage

to 1.22ꢀ: ꢀ /1.22ꢀ. For example, load regulation for an

OUT

output current change of 1mA to 300mA is –2mꢀ typical

at ꢀ

= 1.22ꢀ. At ꢀ

= 12ꢀ, load regulation is:

OUT

(12ꢀ/1.22ꢀ)(–2mꢀ) = –19.7mꢀ

Bypass Capacitance and Low Noise Performance

The LT1962 regulators may be used with the addition

of a bypass capacitor from ꢀ

to the BYP pin to lower

OUT

output voltage noise. A good quality low leakage capacitor

is recommended. This capacitor will bypass the reference

of the regulator, providing a low frequency noise pole. The

noise pole provided by this bypass capacitor will lower the

Adjustable Operation

outputvoltagenoisetoaslowas20µꢀ

withtheaddition

TheadjustableversionoftheLT1962hasanoutputvoltage

range of 1.22ꢀ to 20ꢀ. The output voltage is set by the

ratio of two external resistors as shown in Figure 2. The

device servos the output to maintain the ADJ pin voltage

at 1.22ꢀ referenced to ground. The current in R1 is then

equal to 1.22ꢀ/R1 and the current in R2 is the current in

RMS

ofa0.01µFbypasscapacitor.Usingabypasscapacitorhas

theaddedbenefitofimprovingtransientresponse.Withno

bypass capacitor and a 10µF output capacitor, a 10mA to

300mA load step will settle to within 1% of its final value

in less than 100µs. With the addition of a 0.01µF bypass

capacitor, the output will settle to within 1% for a 10mA

to 300mA load step in less than 10µs, with total output

voltage deviation of less than 2% (see LT1962-5 Transient

Response in the Typical Performance Characteristics sec-

tion). However, regulator start-up time is proportional to

the size of the bypass capacitor, slowing to 15ms with a

0.01µF bypass capacitor and 10µF output capacitor.

IN

OUT

V

OUT

+

V

IN

LT1962

GND

R2

R1

ADJ

1962 F02

⎛

⎞

R2

ꢀ_OUT= 1.22ꢀ 1+

+ I

(

R2

_ADJ)( )

⎜

⎟

⎝

R1⎠

Output Capacitance and Transient Response

ꢀ

_ADJ= 1.22ꢀ

I_ADJ= 30nA at 25°C

OUTPUT RANGE = 1.22ꢀ to 20ꢀ

The LT1962 regulators are designed to be stable with a

wide range of output capacitors. The ESR of the output

capacitor affects stability, most notably with small capaci-

tors. A minimum output capacitor of 3.3µF with an ESR

of 3Ω or less is recommended to prevent oscillations.

1962fba

Figure 2. Adjustable Operation

12

For more information www.linear.com/LT1962

LT1962 Series

applicaTions inForMaTion

The LT1962-X is a micropower device and output tran-

sient response will be a function of output capacitance.

Larger values of output capacitance decrease the peak

deviations and provide improved transient response for

larger load current changes. Bypass capacitors, used to

decouple individual components powered by the LT1962,

will increase the effective output capacitor value. With

larger capacitors used to bypass the reference (for low

noise operation), larger values of output capacitance are

needed. For 100pF of bypass capacitance, 4.7µF of output

capacitor is recommended. With a 1000pF bypass capaci-

tor or larger, a 6.8µF output capacitor is recommended.

Extra consideration must be given to the use of ceramic

capacitors. Ceramic capacitors are manufactured with a

variety of dielectrics, each with different behavior across

temperature and applied voltage. The most common

dielectrics used are Z5U, Y5ꢀ, X5R and X7R. The Z5U and

Y5ꢀ dielectrics are good for providing high capacitance

in a small package, but exhibit strong voltage and tem-

perature coefficients as shown in Figures 4 and 5. When

used with a 5ꢀ regulator, a 10µF Y5ꢀ capacitor can exhibit

an effective value as low as 1µF to 2µF over the operating

temperature range. The X5R and X7R dielectrics result in

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.

The shaded region of Figure 3 defines the range over

whichtheLT1962regulatorsarestable.TheminimumESR

needed is defined by the amount of bypass capacitance

used, while the maximum ESR is 3Ω.

4.0

3.5

20

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10µF

0

3.0

X5R

STABLE REGION

2.5

–20

2.0

–40

C

= 0

BYP

1.5

1.0

0.5

0

–60

C

= 100pF

BYP

Y5V

C

= 330pF

BYP

C

≥ 1000pF

BYP

–80

–100

0

8

12 14

1

3

6 9 10

7 8

2

4

6

10

16

2

4

5

DC BIAS VOLTAGE (V)

OUTPUT CAPACITANCE (µF)

1962 F03

1962 F04

Figure 3. Stability

Figure 4. Ceramic Capacitor DC Bias Characteristics

40

20

LT1962-5

C

LOAD

= 10µF

= 0.01µF

= 100mA

OUT

BYP

X5R

0

I

–20

–40

–60

–80

–100

V

OUT

Y5V

500µV/DIV

BOTH CAPACITORS ARE 16V,

1210 CASE SIZE, 10µF

–50 –25

0

25

50

TEMPERATURE (°C)

75

100 125

1962 F06

100ms/DIV

1962 F05

Figure 5. Ceramic Capacitor Temperature Characteristics

Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor

1962fba

13

For more information www.linear.com/LT1962

LT1962 Series

applicaTions inForMaTion

ꢀoltage and temperature coefficients are not the only

sources of problems. Some ceramic capacitors have a

piezoelectric response. A piezoelectric device generates

voltage across its terminals due to mechanical stress,

similar to the way a piezoelectric accelerometer or

microphone works. For a ceramic capacitor the stress can

beinducedbyvibrationsinthesystemorthermaltransients.

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

Similar vibration induced behavior can masquerade as

increased output voltage noise.

The following table lists thermal resistance for several

different board sizes and copper areas. All measurements

were taken in still air on 1/16" FR-4 board with one ounce

copper.

Table 1. Measured Thermal Resistance

COPPER AREA

THERMAL RESISTANCE

TOPSIDE*

BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT)

2

2500mm

110°C/W

115°C/W

120°C/W

130°C/W

140°C/W

2

1000mm

2

225mm

2

100mm

2

50mm

*Device is mounted on topside.

Thermal Considerations

Calculating Junction Temperature

The power handling capability of the device will be limited

by the maximum rated junction temperature (125°C). The

power dissipated by the device will be made up of two

components:

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

age range of 4ꢀ to 6ꢀ, an output current range of 0mA

to 100mA and a maximum ambient temperature of 50°C,

what will the maximum junction temperature be?

1. Output current multiplied by the input/output voltage

The power dissipated by the device will be equal to:

differential: (I )(ꢀ – ꢀ ), and

OUT

IN

OUT

I

(ꢀ

– ꢀ ) + I (ꢀ

)

OUT(MAX) IN(MAX)

OUT

GND IN(MAX)

2. GND pin current multiplied by the input voltage:

(I )(ꢀ ).

where,

GND

IN

I

= 100mA

= 6ꢀ

OUT IN

OUT(MAX)

The GND pin current can be found by examining the GND

Pin Current curves in the Typical Performance Character-

istics section. Power dissipation will be equal to the sum

of the two components listed above.

ꢀ

IN(MAX)

I

at (I

= 100mA, ꢀ = 6ꢀ) = 2mA

GND

So,

The LT1962 series regulators have internal thermal

limiting designed to protect the device during overload

conditions. For continuous normal conditions, the maxi-

mum junction temperature rating of 125°C must not be

exceeded. It is important to give careful consideration to

all sources of thermal resistance from junction to ambi-

ent. Additional heat sources mounted nearby must also

be considered.

P = 100mA(6ꢀ – 3.3ꢀ) + 2mA(6ꢀ) = 0.28W

The thermal resistance will be in the range of 110°C/W to

140°C/W depending on the copper area. So the junction

temperature rise above ambient will be approximately

equal to:

0.28W(125°C/W) = 35.3°C

The maximum junction temperature will then be equal to

the maximum junction temperature rise above ambient

plus the maximum ambient temperature or:

For surface mount devices, heat sinking is accomplished

by using the heat spreading capabilities of the PC board

and its copper traces. Copper board stiffeners and plated

through-holes can also be used to spread the heat gener-

ated by power devices.

T

JMAX

= 50°C + 35.3°C = 85.3°C

1962fba

14

For more information www.linear.com/LT1962

LT1962 Series

applicaTions inForMaTion

Protection Features

divider is used to provide a regulated 1.5ꢀ output from the

1.22ꢀ reference when the output is forced to 20ꢀ. The top

resistor of the resistor divider must be chosen to limit the

current into the ADJ pin to less than 5mA when the ADJ

pin is at 7ꢀ. The 13ꢀ difference between OUT and ADJ pin

divided by the 5mA maximum current into the ADJ pin

yields a minimum top resistor value of 2.6k.

The LT1962 regulators incorporate several protection

featureswhichmakethemidealforuseinbattery-powered

circuits. In addition to the normal protection features

associated with monolithic regulators, such as current

limiting and thermal limiting, the devices are protected

against reverse input voltages, reverse output voltages

and reverse voltages from output to input.

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

to ground, pulled to some intermediate voltage or is left

open circuit. Current flow back into the output will follow

the curve shown in Figure 7.

Current limit protection and thermal overload protection

areintendedtoprotectthedeviceagainstcurrentoverload

conditions at the output of the device. For normal opera-

tion, the junction temperature should not exceed 125°C.

The input of the device will withstand reverse voltages of

20ꢀ. Current flow into the device will be limited to less

than 1mA (typically less than 100µA) and no negative

voltage will appear at the output. The device will protect

both itself and the load. This provides protection against

batteries which can be plugged in backward.

When the IN pin of the LT1962 is forced below the OUT

pin or the OUT pin is pulled above the IN pin, input cur-

rent will typically drop to less than 2µA. This can happen

if the input of the device is connected to a discharged

(low voltage) battery and the output is held up by either

a backup battery or a second regulator circuit. The state

of the SHDN pin will have no effect on the reverse output

current when the output is pulled above the input.

The output of the LT1962 can be pulled below ground

without damaging the device. If the input is left open cir-

cuit or grounded, the output can be pulled below ground

by 20ꢀ. For fixed voltage versions, the output will act like

a large resistor, typically 500k or higher, limiting current

flow to less than 40µA. For adjustable versions, the output

will act like an open circuit; no current will flow out of the

pin. If the input is powered by a voltage source, the output

will source the short-circuit current of the device and will

protect itself by thermal limiting. In this case, grounding

the SHDN pin will turn off the device and stop the output

from sourcing the short-circuit current.

100

T = 25°C

IN

LT1962

J

V

90

80

70

60

50

= 0V

CURRENT FLOWS

INTO OUTPUT PIN

V

= V

(LT1962)

OUT

ADJ

LT1962-1.5

LT1962-1.8

LT1962-2.5

40

30

LT1962-3

LT1962-3.3

20

10

0

LT1962-5

The ADJ pin of the adjustable device can be pulled above

or below ground by as much as 7ꢀ without damaging the

device. If the input is left open circuit or grounded, the

ADJ pin will act like an open circuit when pulled below

ground and like a large resistor (typically 100k) in series

with a diode when pulled above ground.

0

1

2

3

4

5

6

7

8

9

10

OUTPUT VOLTAGE (V)

1962 F07

Figure 7. Reverse Output Current

In situations where the ADJ pin is connected to a resistor

dividerthatwouldpulltheADJpinaboveits7ꢀclampvolt-

age if the output is pulled high, the ADJ pin input current

must be limited to less than 5mA. For example, a resistor

1962fba

15

For more information www.linear.com/LT1962

LT1962 Series

package DescripTion

Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.

MS8 Package

8-Lead Plastic MSOP

(LTC DWG # 05-08-1660 Rev G)

0.889 0.127

(.035 .005)

5.10

3.20 – 3.45

(.201)

(.12ꢀ – .13ꢀ)

MIN

3.00 0.102

(.118 .004)

(NOTE 3)

0.52

(.0205)

REF

0.ꢀ5

(.025ꢀ)

BSC

0.42 0.038

(.01ꢀ5 .0015)

TYP

8

7 ꢀ 5

RECOMMENDED SOLDER PAD LAYOUT

3.00 0.102

(.118 .004)

(NOTE 4)

4.90 0.152

(.193 .00ꢀ)

DETAIL “A”

0.254

(.010)

0° – ꢀ° TYP

GAUGE PLANE

1

2

3

4

0.53 0.152

(.021 .00ꢀ)

1.10

(.043)

MAX

0.8ꢀ

(.034)

REF

DETAIL “A”

0.18

(.007)

SEATING

PLANE

0.22 – 0.38

0.101ꢀ 0.0508

(.009 – .015)

(.004 .002)

0.ꢀ5

(.025ꢀ)

BSC

TYP

MSOP (MS8) 0213 REV G

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.

MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.00ꢀ") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.

INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.00ꢀ") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

1962fba

16

For more information www.linear.com/LT1962

LT1962 Series

revision hisTory ^{(Revision history begins at Rev B)}

REV

DATE

DESCRIPTION

PAGE NUMBER

B

5/15

Clarified the Order Information table.

Added I-grade option.

2

2, 4

1962fba

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.

17

For more information www.linear.com/LT1962

LT1962 Series

Typical applicaTion

Adjustable Current Source

Paralleling of Regulators for Higher Output Current

R1

0.1Ω

R5

0.1Ω

3.3V

IN

OUT

FB

IN

OUT

LT1962-2.5

SHDN FB

GND

300mA

+

V

C1

10µF

C1

10µF

IN

>2.7V

C2

10µF

R1*

1k

LOAD

V

IN

> 3.7V

C4

0.01µF

LT1962-3.3

SHDN

BYP

R2

40.2k

R6

2.2k

R7

100k

LT1004-1.2

GND

R2

0.1Ω

R3

2k

R4

2.2k

IN

OUT

C5

0.01µF

C3

0.33µF

–

LT1962

R6

2k

BYP

ADJ

*ADJUST R1 FOR 0mA TO 300mA

CONSTANT CURRENT

1/2 LT1490

1962 TA04

+

SHDN

GND

R7

C2

1µF

1.21k

R3

2.2k

R4

2.2k

8

3

2

R5

10k

+

1

1/2 LT1490

–

4

1962 TA03

C3

0.01µF

relaTeD parTs

PART NUMBER

LT1120

DESCRIPTION

125mA Low Dropout Regulator with 20µA I

COMMENTS

Includes 2.5ꢀ Reference and Comparator

Q

LT1121

150mA Micropower Low Dropout Regulator

700mA Micropower Low Dropout Regulator

30µA I , SOT-223 Package

Q

LT1129

50µA Quiescent Current

LT1175

500mA Negative Low Dropout Micropower Regulator

300mA Low Dropout Micropower Regulator with Shutdown

3A Low Dropout Regulator with 50µA I

45µA I , 0.26ꢀ Dropout ꢀoltage, SOT-223 Package

Q

LT1521

15µA I , Reverse Battery Protection

Q

LT1529

500mꢀ Dropout ꢀoltage

Q

LTC^®1627

High Efficiency Synchronous Step-Down Switching Regulator

100mA, Low Noise, Low Dropout Micropower Regulator in SOT-23

150mA, Low Noise, LDO Micropower Regulator

Burst Mode™ Operation, Monolithic, 100% Duty Cycle

LT1761

20µA Quiescent Current, 20µꢀ

25µA Quiescent Current, 20µꢀ

30µA Quiescent Current, 20µꢀ

Noise

RMS

LT1762

LT1763

500mA, Low Noise, LDO Micropower Regulator

LT1764

3A, Fast Transient Response Low Dropout Regulator

Constant Frequency Current Mode Step-Down DC/DC Controller

1.5A, Fast Transient Response Low Dropout Regulator

340mꢀ Dropout ꢀoltage, 40µꢀ

RMS

LTC1772

LT1963

Up to 94% Efficiency, SOT-23 Package, 100% Duty Cycle

SO-8, SOT-223 Packages

1962fba

LT 0515 REV B • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

18

For more information www.linear.com/LT1962

(408)432-1900 FAX: (408) 434-0507 www.linear.com/LT1962

●

 LINEAR TECHNOLOGY CORPORATION 2000


型号：	LT1962EMS8-1.8#TRPBF
厂家：	Linear
描述：	LT1962 - 300mA, Low Noise, Micropower LDO Regulators; Package: MSOP; Pins: 8; Temperature Range: -40°C to 85°C 光电二极管输出元件调节器
文件：	总18页 (文件大小：470K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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