Linear Technology LT1963ES8-1.8, LT1963ES8-1.5, LT1963EQ-2.5, LT1963EQ-1.8, LT1963EQ-1.5 Datasheet

1

LT1963 Series

1963fa

TYPICAL APPLICATION

U

APPLICATIO S

U

FEATURES

DESCRIPTIO

U

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

■

Optimized for Fast Transient Response

■

Output Current: 1.5A

■

Dropout Voltage: 340mV

■

Low Noise: 40

µ

V

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

■

Reverse Battery Protection

■

No Reverse Current

■

Thermal Limiting

The LT

®

1963 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

regulators. In addition to fast transient response, the

LT1963 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 LT1963

regulators are stable with output capacitors as low as

10µF. Internal protection circuitry includes reverse battery

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

LT1963 regulators are available in 5-lead TO-220, DD,

3-lead SOT-223 and 8-lead SO packages.

3.3V to 2.5V Regulator

■

3.3V to 2.5V Logic Power Supplies

■

Post Regulator for Switching Supplies

, LTC and LT are registered trademarks of Linear Technology Corporation.

IN

SHDN

10µF

1963 TA01

OUT

V

IN

> 3V

SENSE

GND

LT1963-2.5

2.5V

1.5A

10µF

++

OUTPUT CURRENT (A)

0

DROPOUT VOLTAGE (mV)

200

300

1.6

1963 TA02

100

0

0.4

0.8

1.2

0.2

0.6

1.0

1.4

400

150

250

50

350

Dropout Voltage

2

LT1963 Series

1963fa

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage (Notes 4,12) I

LOAD

= 0.5A 1.9 V

I

LOAD

= 1.5A ● 2.1 2.5 V

Regulated Output Voltage (Note 5) LT1963-1.5 V

IN

= 2.21V, I

LOAD

= 1mA 1.477 1.500 1.523 V

2.5V < V

IN

< 20V, 1mA < I

LOAD

< 1.5A ● 1.447 1.500 1.545 V

LT1963-1.8 V

IN

= 2.3V, I

LOAD

= 1mA 1.773 1.800 1.827 V

2.8V < V

IN

< 20V, 1mA < I

LOAD

< 1.5A ● 1.737 1.800 1.854 V

(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 –45°C to 125°C

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

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

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T

A

= 25°C. (Note 3)

ABSOLUTE AXI U RATI GS

WWWU

ELECTRICAL CHARACTERISTICS

ORDER PART

NUMBER

LT1963EQ

LT1963EQ-1.5

LT1963EQ-1.8

LT1963EQ-2.5

LT1963EQ-3.3

T

JMAX

= 150°C, θ

JA

= 30°C/ W

*PIN 5 = SENSE FOR LT1963-1.8/LT1963-2.5/LT1963-3.3

= ADJ FOR LT1963

ORDER PART

NUMBER

LT1963ET

LT1963ET-1.5

LT1963ET-1.8

LT1963ET-2.5

LT1963ET-3.3

*PIN 5 = SENSE FOR LT1963-1.8/LT1963-2.5/LT1963-3.3

= ADJ FOR LT1963

T

JMAX

= 150°C, θ

JA

= 50°C/ W

Q PACKAGE

5-LEAD PLASTIC DD

TAB IS

GND

FRONT VIEW

SENSE/ADJ*

OUT

GND

IN

SHDN

5

4

3

2

1

T PACKAGE

5-LEAD PLASTIC TO-220

SENSE/ADJ*

OUT

GND

IN

SHDN

FRONT VIEW

TAB IS

GND

5

4

3

2

1

3

2

1

FRONT VIEW

TAB IS

GND

OUT

GND

IN

ST PACKAGE

3-LEAD PLASTIC SOT-223

T

JMAX

= 150°C, θ

JA

= 50°C/ W

LT1963EST-1.5

LT1963EST-1.8

LT1963EST-2.5

LT1963EST-3.3

ORDER PART

NUMBER

LT1963ES8

LT1963ES8-1.5

LT1963ES8-1.8

LT1963ES8-2.5

LT1963ES8-3.3

ORDER PART

NUMBER

1

2

3

4

8

7

6

5

TOP VIEW

IN

GND

GND

SHDN

OUT

SENSE/ADJ*

GND

NC

S8 PACKAGE

8-LEAD PLASTIC SO

*PIN 2 = SENSE FOR LT1963-1.8/LT1963-2.5/LT1963-3.3

= ADJ FOR LT1963

T

JMAX

= 150°C, θ

JA

= 70°C/ W

PACKAGE/ORDER I FOR ATIO

UU

W

ST PART

MARKING

1963

196315

196318

196325

196333

S8 PART

MARKING

196315

196318

196325

196333

Consult LTC Marketing for parts specified with wider operating temperature ranges.

3

LT1963 Series

1963fa

PARAMETER CONDITIONS MIN TYP MAX UNITS

LT1963-2.5 V

IN

= 3V, I

LOAD

= 1mA 2.462 2.500 2.538 V

3.5V < V

IN

< 20V, 1mA < I

LOAD

< 1.5A ● 2.412 2.500 2.575 V

LT1963-3.3 V

IN

= 3.8V, I

LOAD

= 1mA 3.250 3.300 3.350 V

4.3V < V

IN

< 20V, 1mA < I

LOAD

< 1.5A ● 3.200 3.300 3.400 V

ADJ Pin Voltage LT1963 V

IN

= 2.21V, I

LOAD

= 1mA 1.192 1.210 1.228 V

(Notes 4, 5) 2.5V < V

IN

< 20V, 1mA < I

LOAD

< 1.5A ● 1.174 1.210 1.246 V

Line Regulation LT1963-1.5 ∆V

IN

= 2.21V to 20V, I

LOAD

= 1mA ● 2.0 10 mV

LT1963-1.8 ∆V

IN

= 2.3V to 20V, I

LOAD

= 1mA ● 2.5 10 mV

LT1963-2.5 ∆V

IN

= 3V to 20V, I

LOAD

= 1mA ● 3.0 10 mV

LT1963-3.3 ∆V

IN

= 3.8V to 20V, I

LOAD

= 1mA ● 3.5 10 mV

LT1963 (Note 4) ∆V

IN

= 2.21V to 20V, I

LOAD

= 1mA ● 1.5 10 mV

Load Regulation LT1963-1.5 V

IN

= 2.5V, ∆I

LOAD

= 1mA to 1.5A 2 9 mV

V

IN

= 2.5V, ∆I

LOAD

= 1mA to 1.5A ● 18 mV

LT1963-1.8 V

IN

= 2.8V, ∆I

LOAD

= 1mA to 1.5A 2 10 mV

V

IN

= 2.8V, ∆I

LOAD

= 1mA to 1.5A ● 20 mV

LT1963-2.5 V

IN

= 3.5V, ∆I

LOAD

= 1mA to 1.5A 2.5 15 mV

V

IN

= 3.5V, ∆I

LOAD

= 1mA to 1.5A ● 30 mV

LT1963-3.3 V

IN

= 4.3V, ∆I

LOAD

= 1mA to 1.5A 3 20 mV

V

IN

= 4.3V, ∆I

LOAD

= 1mA to 1.5A ● 35 mV

LT1963 (Note 4) V

IN

= 2.5V, ∆I

LOAD

= 1mA to 1.5A 2 8 mV

V

IN

= 2.5V, ∆I

LOAD

= 1mA to 1.5A ● 15 mV

Dropout Voltage I

LOAD

= 1mA 0.02 0.06 V

V

IN

= V

OUT(NOMINAL)

I

LOAD

= 1mA ● 0.10 V

(Notes 6, 7, 12)

I

LOAD

= 100mA 0.10 0.17 V

I

LOAD

= 100mA ● 0.22 V

I

LOAD

= 500mA 0.19 0.27 V

I

LOAD

= 500mA ● 0.35 V

I

LOAD

= 1.5A 0.34 0.45 V

I

LOAD

= 1.5A ● 0.55 V

GND Pin Current I

LOAD

= 0mA ● 1.0 1.5 mA

V

IN

= V

OUT(NOMINAL)

+ 1V I

LOAD

= 1mA ● 1.1 1.6 mA

(Notes 6, 8)

I

LOAD

= 100mA ● 3.8 5.5 mA

I

LOAD

= 500mA ● 15 25 mA

I

LOAD

= 1.5A ● 80 120 mA

Output Voltage Noise C

OUT

= 10µF, I

LOAD

= 1.5A, BW = 10Hz to 100kHz 40 µV

RMS

ADJ Pin Bias Current (Notes 4, 9) 3 10 µA

Shutdown Threshold V

OUT

= Off to On ● 0.90 2 V

V

OUT

= On to Off ● 0.25 0.75 V

SHDN Pin Current V

SHDN

= 0V 0.01 1 µA

(Note 10) V

SHDN

= 20V 3 30 µA

Quiescent Current in Shutdown V

IN

= 6V, V

SHDN

= 0V 0.01 1 µA

Ripple Rejection V

IN

– V

OUT

= 1.5V (Avg), V

RIPPLE

= 0.5V

P-P

,5563dB

f

RIPPLE

= 120Hz, I

LOAD

= 0.75A

Current Limit V

IN

= 7V, V

OUT

= 0V 2 A

V

IN

= V

OUT(NOMINAL)

+ 1V, ∆V

OUT

= –0.1V ● 1.6 A

Input Reverse Leakage Current (Note 13) Q, T, S8 Packages V

IN

= –20V, V

OUT

= 0V ● 1mA

ST Package V

IN

= –20V, V

OUT

= 0V ● 2mA

Reverse Output Current (Note 11) LT1963-1.5 V

OUT

= 1.5V, V

IN

< 1.5V 600 1200 µA

LT1963-1.8 V

OUT

= 1.8V, V

IN

< 1.8V 600 1200 µA

LT1963-2.5 V

OUT

= 2.5V, V

IN

< 2.5V 600 1200 µA

LT1963-3.3 V

OUT

= 3.3V, V

IN

< 3.3V 600 1200 µA

LT1963 (Note 4) V

OUT

= 1.21V, V

IN

< 1.21V 300 600 µA

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T

A

= 25°C. (Note 2)

ELECTRICAL CHARACTERISTICS

4

LT1963 Series

1963fa

ELECTRICAL CHARACTERISTICS

TYPICAL PERFOR A CE CHARACTERISTICS

UW

OUTPUT CURRENT (A)

0

DROPOUT VOLTAGE (mV)

500

450

400

350

300

250

200

150

100

50

0

0.4

0.8

1.0

1963 • G01

0.2 0.6

1.2

1.4

1.6

T

J

= 125°C

T

J

= 25°C

OUTPUT CURRENT (A)

GUARANTEED DROPOUT VOLTAGE (mV)

600

500

400

300

200

100

0

0

0.4

0.8

1.0

1963 • G02

0.2 0.6

1.2

1.4

1.6

T

J

≤ 125°C

T

J

≤ 25°C

TEST POINTS

TEMPERATURE (°C)

–50

DROPOUT VOLTAGE (mV)

500

450

400

350

300

250

200

150

100

50

0

0

50

75

1963 G03

–25

25

100

125

I

L

= 100mA

I

L

= 1mA

I

L

= 0.5A

I

L

= 1.5A

TEMPERATURE (°C)

–50

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

25 75

1963 G04

–25 0

50 100 125

QUIESCENT CURRENT (mA)

LT1963-1.8/-2.5/-3.3

LT1963

V

IN

= 6V

R

L

= ∞, I

L

= 0

V

SHDN

= V

IN

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

100

1963 G05

050

1.84

1.83

1.82

1.81

1.80

1.79

1.78

1.77

1.76

–25 25 75 125

I

L

= 1mA

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

100

1963 G06

050

2.58

2.56

2.54

2.52

2.50

2.48

2.46

2.44

2.42

–25 25 75 125

I

L

= 1mA

Typical Dropout Voltage

Guaranteed Dropout Voltage Dropout Voltage

Quiescent Current LT1963-1.8 Output Voltage LT1963-2.5 Output Voltage

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Absolute maximum input to output differential voltage can not 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 3: The LT1963 regulators are tested and specified under pulse load

conditions such that T

J

≈ T

A

. The LT1963 is 100% tested at

T

A

= 25°C. Performance at –40°C and 125°C is assured by design,

characterization and correlation with statistical process controls.

Note 4: The LT1963 (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.

Note 6: To satisfy requirements for minimum input voltage, the LT1963

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

external resistor divider (two 4.12k resistors) for an output voltage of

2.4V. The external resistor divider will add a 300µA DC load on the output.

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

IN

– V

DROPOUT

.

Note 8: GND pin current is tested with V

IN

= V

OUT(NOMINAL)

+ 1V and a

current source load. The GND pin current will decrease 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.

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 LT1963, LT1963-1.5 and LT1963-1.8 dropout voltage will

be limited by the minimum input voltage specification under some output

voltage/load conditions.

Note 13. For the ST package, the input reverse leakage current increases

due to the additional reverse leakage current for the SHDN pin, which is

tied internally to the IN pin.

5

LT1963 Series

1963fa

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

100

1963 G07

050

3.38

3.36

3.34

3.32

3.30

3.28

3.26

3.24

3.22

–25 25 75 125

I

L

= 1mA

TEMPERATURE (°C)

–50

ADJ PIN VOLTAGE (V)

100

1963 G08

050

1.230

1.225

1.220

1.215

1.210

1.205

1.200

1.195

1.190

–25 25 75 125

I

L

= 1mA

INPUT VOLTAGE (V)

0

QUIESCENT CURRENT (mA)

14

12

10

8

6

4

2

0

1963 G09

2

5678910

1

34

T

J

= 25°C

R

L

= ∞

V

SHDN

= V

IN

TYPICAL PERFOR A CE CHARACTERISTICS

UW

LT1963-3.3 Output Voltage

INPUT VOLTAGE (V)

0

QUIESCENT CURRENT (mA)

14

12

10

8

6

4

2

0

1963 G10

2

1056789

1

34

T

J

= 25°C

R

L

= ∞

V

SHDN

= V

IN

INPUT VOLTAGE (V)

0

QUIESCENT CURRENT (mA)

14

12

10

8

6

4

2

0

1963 G11

2

1056789

1

34

T

J

= 25°C

R

L

= ∞

V

SHDN

= V

IN

INPUT VOLTAGE (V)

0

QUIESCENT CURRENT (mA)

14

12

10

8

6

4

2

0

1963 G12

4

2010 12 14 16 18

2

68

T

J

= 25°C

R

L

= 4.3k

V

SHDN

= V

IN

INPUT VOLTAGE (V)

0

GND PIN CURRENT (mA)

25

20

15

10

5

0

4

1963 G13

1

2

3

1098765

T

J

= 25°C

V

SHDN

= V

IN

*FOR V

OUT

= 1.18V

R

L

= 180, I

L

= 10mA*

R

L

= 18, I

L

= 100mA*

R

L

= 6, I

L

= 300mA*

INPUT VOLTAGE (V)

0

GND PIN CURRENT (mA)

25

20

15

10

5

0

4

1963 G14

1

2

3

1098765

R

L

= 250, I

L

= 10mA*

R

L

= 25, I

L

= 100mA*

R

L

= 8.33, I

L

= 300mA*

T

J

= 25°C

V

SHDN

= V

IN

*FOR V

OUT

= 2.5V

INPUT VOLTAGE (V)

0

GND PIN CURRENT (mA)

25

20

15

10

5

0

4

1963 G15

1

2

3

1098765

R

L

= 330, I

L

= 100mA*

R

L

= 33, I

L

= 100mA*

R

L

= 11, I

L

= 300mA*

T

J

= 25°C

V

SHDN

= V

IN

*FOR V

OUT

= 3.3V

LT1963 ADJ Pin Voltage

LT1963-1.8 Quiescent Current

LT1963-2.5 Quiescent Current

LT1963-3.3 Quiescent Current LT1963 Quiescent Current

LT1963-1.8 GND Pin Current

LT1963-2.5 GND Pin Current LT1963-3.3 GND Pin Current