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LT1963A Series

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

FeaTures

DescripTion

The

1963A

series are low dropout regulators optimized

for fast transient response. The devices are capable of

supplying 1.5A of output current with a dropout voltage of

340mV. Operating quiescent current is 1mA, dropping to

< 1µA in shutdown. Quiescent current is well controlled; it

does not rise in dropout as it does with many other regula-

tors. In addition to fast transient response, the LT1963A

regulators have very low output noise which makes them

ideal for sensitive RF supply applications.

Output voltage range is from 1.21V to 20V. The LT1963A

regulators are stable with output capacitors as low as

10µF. Internal protection circuitry includes reverse bat-

tery protection, current limiting, thermal limiting and

reverse current protection. The devices are available in

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

an adjustable device with a 1.21V reference voltage. The

LT1963A regulators are available in 5-lead TO-220, DD,

3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages.

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

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners. Protected by U.S. Patents including 6118263, 6144250.

*See Applications Information Section.

Optimized for Fast Transient Response

Output Current: 1.5A

Dropout Voltage: 340mV

Low Noise: 40µV

RMS

(10Hz to 100kHz)

1mA Quiescent Current

No Protection Diodes Needed

Controlled Quiescent Current in Dropout

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

Adjustable Output from 1.21V to 20V

< 1µA Quiescent Current in Shutdown

Stable with 10µF Output Capacitor*

Stable with Ceramic Capacitors*

Reverse Battery Protection

No Reverse Current

Thermal Limiting

5-Lead TO-220, DD, 3-Lead SOT-223 and

8-Lead SO Packages

applicaTions

3.3V to 2.5V Logic Power Supplies

Post Regulator for Switching Supplies

Typical applicaTion

Dropout Voltage

3.3V to 2.5V Regulator

DROPOUT VOLTAGE (mV)

400

350

> 3V

10µF*

OUT

2.5V

1.5A

10µF*

300

250

200

150

100

0.2

0.4 0.6 0.8 1.0 1.2

OUTPUT CURRENT (A)

1.4 1.6

1963A TA02

LT1963A-2.5

SHDN

SENSE

GND

1963A TA01

*TANTALUM,

CERAMIC OR

ALUMINUM ELECTROLYTIC

1963aff

For more information

www.linear.com/LT1963A

LT1963A Series

absoluTe MaxiMuM raTings

(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

SHDN

Pin Voltage ................................................. ±20V

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

Operating Junction Temperature Range (Note 3)

LT1963AE...........................................– 40°C to 125°C

LT1963AI............................................– 40°C to 125°C

LT1963AMP .......................................– 55°C to 125°C

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

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

pin conFiguraTion

TOP VIEW

GND

FRONT VIEW

TAB IS

GND

Q PACKAGE

5-LEAD PLASTIC DD

SENSE/ADJ*

OUT

GND

SHDN

TAB IS

GND

FRONT VIEW

T PACKAGE

5-LEAD PLASTIC TO-220

SENSE/

ADJ*

OUT

GND

SHDN

OUT

SENSE/ADJ*

GND

16 GND

15 NC

14 IN

13 IN

12 IN

11 NC

SHDN

GND

*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/

LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150°C,

= 30°C/ W

*PIN 5 = SENSE FOR LT1963A-1.5/LT1963A-1.8/

LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150°C,

= 50°C/ W

*PIN 6 = SENSE FOR LT1963A-1.5/LT1963A-1.8/

LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150°C,

= 38°C/ W

FE PACKAGE

16-LEAD PLASTIC TSSOP

EXPOSED PAD (PIN 17) IS GND. MUST BE

SOLDERED TO THE PCB.

FRONT VIEW

TAB IS

GND

OUT

GND

OUT 1

SENSE/ADJ* 2

GND 3

NC 4

TOP VIEW

GND

SHDN

ST PACKAGE

3-LEAD PLASTIC SOT-223

S8 PACKAGE

8-LEAD PLASTIC SO

JMAX

= 150°C,

= 50°C/ W

*PIN 2 = SENSE FOR LT1963A-1.5/LT1963A-1.8/

LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150°C,

= 70°C/ W

1963aff

For more information

www.linear.com/LT1963A

LT1963A Series

orDer inForMaTion

LEAD FREE FINISH

LT1963AEQ#PBF

LT1963AIQ#PBF

LT1963AMPQ#PBF

LT1963AEQ-1.5#PBF

LT1963AEQ-1.8#PBF

LT1963AEQ-2.5#PBF

LT1963AEQ-3.3#PBF

LT1963AET#PBF

LT1963AIT#PBF

LT1963AET-1.5#PBF

LT1963AET-1.8#PBF

LT1963AET-2.5#PBF

LT1963AET-3.3#PBF

LT1963AEFE#PBF

LT1963AIFE#PBF

LT1963AEFE-1.5#PBF

LT1963AEFE-1.8#PBF

LT1963AEFE-2.5#PBF

LT1963AEFE-3.3#PBF

LT1963AEST-1.5#PBF

LT1963AEST-1.8#PBF

LT1963AEST-2.5#PBF

LT1963AEST-3.3#PBF

LT1963AES8#PBF

LT1963AIS8#PBF

LT1963AMPS8#PBF

LT1963AES8-1.5#PBF

LT1963AES8-1.8#PBF

LT1963AES8-2.5#PBF

LT1963AES8-3.3#PBF

LEAD BASED FINISH

LT1963AEQ

LT1963AIQ

LT1963AMPQ

LT1963AEQ-1.5

LT1963AEQ-1.8

LT1963AEQ-2.5

LT1963AEQ-3.3

LT1963AET

LT1963AIT

TAPE AND REEL

LT1963AEQ#TRPBF

LT1963AIQ#TRPBF

LT1963AMPQ#TRPBF

LT1963AEQ-1.5#TRPBF

LT1963AEQ-1.8#TRPBF

LT1963AEQ-2.5#TRPBF

LT1963AEQ-3.3#TRPBF

LT1963AET#TRPBF

LT1963AIT#TRPBF

LT1963AET-1.5#TRPBF

LT1963AET-1.8#TRPBF

LT1963AET-2.5#TRPBF

LT1963AET-3.3#TRPBF

LT1963AEFE#TRPBF

LT1963AIFE#TRPBF

LT1963AEFE-1.5#TRPBF

LT1963AEFE-1.8#TRPBF

LT1963AEFE-2.5#TRPBF

LT1963AEFE-3.3#TRPBF

LT1963AEST-1.5#TRPBF

LT1963AEST-1.8#TRPBF

LT1963AEST-2.5#TRPBF

LT1963AEST-3.3#TRPBF

LT1963AES8#TRPBF

LT1963AIS8#TRPBF

LT1963AMPS8#TRPBF

LT1963AES8-1.5#TRPBF

LT1963AES8-1.8#TRPBF

LT1963AES8-2.5#TRPBF

LT1963AES8-3.3#TRPBF

TAPE AND REEL

LT1963AEQ#TR

LT1963AIQ#TR

LT1963AMPQ#TR

LT1963AEQ-1.5#TR

LT1963AEQ-1.8#TR

LT1963AEQ-2.5#TR

LT1963AEQ-3.3#TR

LT1963AET#TR

LT1963AIT#TR

PART MARKING*

LT1963AEQ

LT1963AIQ

LT1963AMPQ

LT1963AEQ-1.5

LT1963AEQ-1.8

LT1963AEQ-2.5

LT1963AEQ-3.3

LT1963AET

LT1963AIT

LT1963AET-1.5

LT1963AET-1.8

LT1963AET-2.5

LT1963AET-3.3

1963AEFE

1963AIFE

1963AEFE15

1963AEFE18

1963AEFE25

1963AEFE33

963A15

963A18

963A25

963A33

1963A

963AMP

963A15

963A18

963A25

963A33

PART MARKING*

LT1963AEQ

LT1963AIQ

LT1963AMPQ

LT1963AEQ-1.5

LT1963AEQ-1.8

LT1963AEQ-2.5

LT1963AEQ-3.3

LT1963AET

LT1963AIT

PACKAGE DESCRIPTION

5-Lead Plastic DD-Pak

5-Lead Plastic TO-220

16-Lead Plastic TSSOP

3-Lead Plastic SOT-223

8-Lead Plastic SO

PACKAGE DESCRIPTION

5-Lead Plastic DD-Pak

5-Lead Plastic TO-220

TEMPERATURE RANGE

–40°C to 125°C

–55°C to 125°C

–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

1963aff

For more information

www.linear.com/LT1963A

LT1963A Series

orDer inForMaTion

LEAD BASED FINISH

LT1963AET-1.5

LT1963AET-1.8

LT1963AET-2.5

LT1963AET-3.3

LT1963AEFE

LT1963AIFE

LT1963AEFE-1.5

LT1963AEFE-1.8

LT1963AEFE-2.5

LT1963AEFE-3.3

LT1963AEST-1.5

LT1963AEST-1.8

LT1963AEST-2.5

LT1963AEST-3.3

LT1963AES8

LT1963AIS8

LT1963AMPS8

LT1963AES8-1.5

LT1963AES8-1.8

LT1963AES8-2.5

LT1963AES8-3.3

TAPE AND REEL

LT1963AET-1.5#TR

LT1963AET-1.8#TR

LT1963AET-2.5#TR

LT1963AET-3.3#TR

LT1963AEFE#TR

LT1963AIFE#TR

LT1963AEFE-1.5#TR

LT1963AEFE-1.8#TR

LT1963AEFE-2.5#TR

LT1963AEFE-3.3#TR

LT1963AEST-1.5#TR

LT1963AEST-1.8#TR

LT1963AEST-2.5#TR

LT1963AEST-3.3#TR

LT1963AES8#TR

LT1963AIS8#TR

LT1963AMPS8#TR

LT1963AES8-1.5#TR

LT1963AES8-1.8#TR

LT1963AES8-2.5#TR

LT1963AES8-3.3#TR

PART MARKING*

LT1963AET-1.5

LT1963AET-1.8

LT1963AET-2.5

LT1963AET-3.3

1963AEFE

1963AIFE

1963AEFE15

1963AEFE18

1963AEFE25

1963AEFE33

963A15

963A18

963A25

963A33

1963A

963AMP

963A15

963A18

963A25

963A33

PACKAGE DESCRIPTION

5-Lead Plastic TO-220

16-Lead Plastic TSSOP

3-Lead Plastic SOT-223

8-Lead Plastic SO

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/

1963aff

For more information

www.linear.com/LT1963A

LT1963A Series

The

denotes specifications which apply over the full operating

temperature range, otherwise specifications are at T

= 25°C. (Note 3)

PARAMETER

Minimum Input Voltage (Notes 4,12)

Regulated Output Voltage (Note 5)

CONDITIONS

LOAD

= 0.5A

LOAD

= 1.5A

LT1963A-1.5

LT1963A-1.8

LT1963A-2.5

LT1963A-3.3

ADJ Pin Voltage (Notes 4, 5)

Line Regulation

LT1963A

LT1963A-1.5

LT1963A-1.8

LT1963A-2.5

LT1963A-3.3

LT1963A (Note 4)

LT1963A-1.5

LT1963A-1.8

LT1963A-2.5

LT1963A-3.3

LT1963A (Note 4)

Dropout Voltage

= V

OUT(NOMINAL)

(Notes 6, 7, 12)

LOAD

= 1mA

LOAD

= 1mA

LOAD

= 100mA

LOAD

= 100mA

LOAD

= 500mA

LOAD

= 500mA

LOAD

= 1.5A

LOAD

= 1.5A

GND Pin Current

= V

OUT(NOMINAL)

+ 1V

(Notes 6, 8)

LOAD

= 0mA

LOAD

= 1mA

LOAD

= 100mA

LOAD

= 500mA

LOAD

= 1.5A

OUT

= 10µF, I

LOAD

= 1.5A, BW = 10Hz to 100kHz

(Notes 4, 9)

OUT

= Off to On

OUT

= On to Off

SHDN

= 0V

SHDN

= 20V

= 6V, V

SHDN

= 0V

●

elecTrical characTerisTics

MIN

TYP

1.9

2.1

MAX

2.5

1.523

1.545

1.827

1.854

2.538

2.575

3.350

3.400

1.228

1.246

0.06

0.10

0.17

0.22

0.27

0.35

0.45

0.55

1.5

1.6

5.5

120

UNITS

µV

RMS

µA

= 2.21V, I

LOAD

= 1mA

2.5V < V

< 20V, 1mA < I

LOAD

< 1.5A

= 2.3V, I

LOAD

= 1mA

2.8V < V

< 20V, 1mA < I

LOAD

< 1.5A

= 3V, I

LOAD

= 1mA

3.5V < V

< 20V, 1mA < I

LOAD

< 1.5A

= 3.8V, I

LOAD

= 1mA

4.3V < V

< 20V, 1mA < I

LOAD

< 1.5A

= 2.21V, I

LOAD

= 1mA

2.5V < V

< 20V, 1mA < I

LOAD

< 1.5A

∆V

= 2.21V to 20V, I

LOAD

= 1mA

∆V

= 2.3V to 20V, I

LOAD

= 1mA

∆V

= 3V to 20V, I

LOAD

= 1mA

∆V

= 3.8V to 20V, I

LOAD

= 1mA

∆V

= 2.21V to 20V, I

LOAD

= 1mA

= 2.5V, ∆I

LOAD

= 1mA to 1.5A

= 2.5V, ∆I

LOAD

= 1mA to 1.5A

= 2.8V, ∆I

LOAD

= 1mA to 1.5A

= 2.8V, ∆I

LOAD

= 1mA to 1.5A

= 3.5V, ∆I

LOAD

= 1mA to 1.5A

= 3.5V, ∆I

LOAD

= 1mA to 1.5A

= 4.3V, ∆I

LOAD

= 1mA to 1.5A

= 4.3V, ∆I

LOAD

= 1mA to 1.5A

= 2.5V, ∆I

LOAD

= 1mA to 1.5A

= 2.5V, ∆I

LOAD

= 1mA to 1.5A

●

1.477

1.447

1.773

1.737

2.462

2.412

3.250

3.200

1.192

1.174

1.500

1.800

2.500

3.300

1.210

2.0

2.5

3.0

3.5

1.5

Load Regulation

●

2.5

●

0.02

●

0.10

●

0.19

●

0.34

●

1.0

1.1

3.8

0.25

0.90

0.75

0.01

Output Voltage Noise

ADJ Pin Bias Current

Shutdown Threshold

SHDN

Pin Current (Note 10)

Quiescent Current in Shutdown

1963aff

For more information

www.linear.com/LT1963A