Linear Technology LT1963AET-3.3, LT1963AET-1.5, LT1963AET, LT1963AEST-3.3, LT1963AEST-2.5 Datasheet

...

0 (0)

LT1963A Series

1963af

TYPICAL APPLICATION

APPLICATIO S

FEATURES

DESCRIPTIO

1.5A, Low Noise,

Fast Transient Response

LDO Regulators

■

Optimized for Fast Transient Response

■

Output Current: 1.5A

■

Dropout Voltage: 340mV

■

Low Noise: 40

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

■

<1mA Quiescent Current in Shutdown

■

Stable with 10mF Output Capacitor

■

Stable with Ceramic Capacitors

■

Reverse Battery Protection

■

No Reverse Current

■

Thermal Limiting

The LT

1963A series are low dropout regulators opti-

mized 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 < 1mA 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

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

10mF. Small ceramic capacitors can be used without the

necessary addition of ESR as is common with other

regulators. 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

LT1963A 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.

SHDN

10µF*

*TANTALUM,

CERAMIC OR

ALUMINUM ELECTROLYTIC

1963 TA01

OUT

> 3V

SENSE

GND

LT1963A-2.5

2.5V

1.5A

10µF*

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

200

300

1.6

1963 TA02

100

0.4

0.8

1.2

0.2

0.6

1.0

1.4

400

150

250

350

Dropout Voltage

LT1963A Series

1963af

(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

ABSOLUTE AXI U RATI GS

WWWU

ORDER PART

NUMBER

LT1963AEQ

LT1963AEQ-1.5

LT1963AEQ-1.8

LT1963AEQ-2.5

LT1963AEQ-3.3

JMAX

= 150∞C, q

= 30∞C/W

*PIN 5 = SENSE FOR LT1963A-1.8/LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

ORDER PART

NUMBER

LT1963AET

LT1963AET-1.5

LT1963AET-1.8

LT1963AET-2.5

LT1963AET-3.3

*PIN 5 = SENSE FOR LT1963A-1.8/LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150∞C, q

= 50∞C/W

Q PACKAGE

5-LEAD PLASTIC DD

TAB IS

GND

FRONT VIEW

SENSE/ADJ*

OUT

GND

SHDN

T PACKAGE

5-LEAD PLASTIC TO-220

SENSE/ADJ*

OUT

GND

SHDN

FRONT VIEW

TAB IS

GND

FRONT VIEW

TAB IS

GND

OUT

GND

ST PACKAGE

3-LEAD PLASTIC SOT-223

JMAX

= 150∞C, q

= 50∞C/W

LT1963AEST-1.5

LT1963AEST-1.8

LT1963AEST-2.5

LT1963AEST-3.3

ORDER PART

NUMBER

LT1963AES8

LT1963AES8-1.5

LT1963AES8-1.8

LT1963AES8-2.5

LT1963AES8-3.3

ORDER PART

NUMBER

TOP VIEW

GND

SHDN

OUT

SENSE/ADJ*

GND

S8 PACKAGE

8-LEAD PLASTIC SO

*PIN 2 = SENSE FOR LT1963A-1.8/LT1963A-2.5/LT1963A-3.3

= ADJ FOR LT1963A

JMAX

= 150∞C, q

= 70∞C/W

PACKAGE/ORDER I FOR ATIO

ST PART

MARKING

1963A

963A15

963A18

963A25

963A33

S8 PART

MARKING

963A15

963A18

963A25

963A33

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

LT1963A Series

1963af

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage (Notes 4,12) I

LOAD

= 0.5A 1.9 V

LOAD

= 1.5A ● 2.1 2.5 V

Regulated Output Voltage (Note 5) LT1963A-1.5 V

= 2.21V, I

LOAD

= 1mA 1.477 1.500 1.523 V

2.5V < V

< 20V, 1mA < I

LOAD

< 1.5A ● 1.447 1.500 1.545 V

LT1963A-1.8 V

= 2.3V, I

LOAD

= 1mA 1.773 1.800 1.827 V

2.8V < V

< 20V, 1mA < I

LOAD

< 1.5A ● 1.737 1.800 1.854 V

LT1963A-2.5 V

= 3V, I

LOAD

= 1mA 2.462 2.500 2.538 V

3.5V < V

< 20V, 1mA < I

LOAD

< 1.5A ● 2.412 2.500 2.575 V

LT1963A-3.3 V

= 3.8V, I

LOAD

= 1mA 3.250 3.300 3.350 V

4.3V < V

< 20V, 1mA < I

LOAD

< 1.5A ● 3.200 3.300 3.400 V

ADJ Pin Voltage LT1963A V

= 2.21V, I

LOAD

= 1mA 1.192 1.210 1.228 V

(Notes 4, 5) 2.5V < V

< 20V, 1mA < I

LOAD

< 1.5A ● 1.174 1.210 1.246 V

Line Regulation LT1963A-1.5 DV

= 2.21V to 20V, I

LOAD

= 1mA ● 2.0 6 mV

LT1963A-1.8 DV

= 2.3V to 20V, I

LOAD

= 1mA ● 2.5 7 mV

LT1963A-2.5 DV

= 3V to 20V, I

LOAD

= 1mA ● 3.0 10 mV

LT1963A-3.3 DV

= 3.8V to 20V, I

LOAD

= 1mA ● 3.5 10 mV

LT1963A (Note 4) DV

= 2.21V to 20V, I

LOAD

= 1mA ● 1.5 5 mV

Load Regulation LT1963A-1.5 V

= 2.5V, DI

LOAD

= 1mA to 1.5A 2 9 mV

= 2.5V, DI

LOAD

= 1mA to 1.5A ● 18 mV

LT1963A-1.8 V

= 2.8V, DI

LOAD

= 1mA to 1.5A 2 10 mV

= 2.8V, DI

LOAD

= 1mA to 1.5A ● 20 mV

LT1963A-2.5 V

= 3.5V, DI

LOAD

= 1mA to 1.5A 2.5 15 mV

= 3.5V, DI

LOAD

= 1mA to 1.5A ● 30 mV

LT1963A-3.3 V

= 4.3V, DI

LOAD

= 1mA to 1.5A 3 20 mV

= 4.3V, DI

LOAD

= 1mA to 1.5A ● 35 mV

LT1963A (Note 4) V

= 2.5V, DI

LOAD

= 1mA to 1.5A 2 8 mV

= 2.5V, DI

LOAD

= 1mA to 1.5A ● 15 mV

Dropout Voltage I

LOAD

= 1mA 0.02 0.06 V

= V

OUT(NOMINAL)

LOAD

= 1mA ● 0.10 V

(Notes 6, 7, 12)

LOAD

= 100mA 0.10 0.17 V

LOAD

= 100mA ● 0.22 V

LOAD

= 500mA 0.19 0.27 V

LOAD

= 500mA ● 0.35 V

LOAD

= 1.5A 0.34 0.45 V

LOAD

= 1.5A ● 0.55 V

GND Pin Current I

LOAD

= 0mA ● 1.0 1.5 mA

= V

OUT(NOMINAL)

+ 1V I

LOAD

= 1mA ● 1.1 1.6 mA

(Notes 6, 8)

LOAD

= 100mA ● 3.8 5.5 mA

LOAD

= 500mA ● 15 25 mA

LOAD

= 1.5A ● 80 120 mA

Output Voltage Noise C

OUT

= 10mF, I

LOAD

= 1.5A, BW = 10Hz to 100kHz 40 mV

RMS

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

Shutdown Threshold V

OUT

= Off to On ● 0.90 2 V

OUT

= On to Off ● 0.25 0.75 V

SHDN Pin Current V

SHDN

= 0V 0.01 1 mA

(Note 10) V

SHDN

= 20V 3 30 mA

Quiescent Current in Shutdown V

= 6V, V

SHDN

= 0V 0.01 1 mA

Ripple Rejection V

– V

OUT

= 1.5V (Avg), V

RIPPLE

= 0.5V

P-P

,5563dB

RIPPLE

= 120Hz, I

LOAD

= 0.75A

Current Limit V

= 7V, V

OUT

= 0V 2 A

= V

OUT(NOMINAL)

+ 1V, DV

OUT

= –0.1V ● 1.6 A

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

= 25∞C. (Note 2)

ELECTRICAL CHARACTERISTICS

LT1963A Series

1963af

TYPICAL PERFOR A CE CHARACTERISTICS

OUTPUT CURRENT (A)

DROPOUT VOLTAGE (mV)

500

450

400

350

300

250

200

150

100

0.4

0.8

1.0

1963 • G01

0.2 0.6

1.2

1.4

1.6

= 125°C

= 25°C

OUTPUT CURRENT (A)

GUARANTEED DROPOUT VOLTAGE (mV)

600

500

400

300

200

100

0.4

0.8

1.0

1963 • G02

0.2 0.6

1.2

1.4

1.6

≤ 125°C

≤ 25°C

TEST POINTS

TEMPERATURE (°C)

–50

DROPOUT VOLTAGE (mV)

500

450

400

350

300

250

200

150

100

1963 G03

–25

100

125

= 100mA

= 1mA

= 0.5A

= 1.5A

Typical Dropout Voltage

Guaranteed Dropout Voltage

Dropout 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 LT1963A regulators are tested and specified under pulse load

conditions such that T

ª T

. The LT1963A is 100% tested at

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

characterization and correlation with statistical process controls.

Note 4: The LT1963A (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 LT1963A

(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 300mA 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

– V

DROPOUT

Note 8: GND pin current is tested with V

= 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 LT1963A, LT1963A-1.5 and LT1963A-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.

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

= 25∞C. (Note 2)

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

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

= –20V, V

OUT

= 0V ● 1mA

ST Package V

= –20V, V

OUT

= 0V ● 2mA

Reverse Output Current (Note 11) LT1963A-1.5 V

OUT

= 1.5V, V

< 1.5V 600 1200 mA

LT1963A-1.8 V

OUT

= 1.8V, V

< 1.8V 600 1200 mA

LT1963A-2.5 V

OUT

= 2.5V, V

< 2.5V 600 1200 mA

LT1963A-3.3 V

OUT

= 3.3V, V

< 3.3V 600 1200 mA

LT1963A (Note 4) V

OUT

= 1.21V, V

< 1.21V 300 600 mA

LT1963A Series

1963af

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

= 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

= 1mA

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

1963 G09

5678910

= 25°C

= ∞

SHDN

= V

TYPICAL PERFOR A CE CHARACTERISTICS

LT1963A-3.3 Output Voltage

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

1963 G10

1056789

= 25°C

= ∞

SHDN

= V

LT1963A ADJ Pin Voltage

LT1963A-1.8 Quiescent Current

LT1963A-2.5 Quiescent Current

TEMPERATURE (°C)

–50

1.4

1.2

1.0

0.8

0.6

0.4

0.2

25 75

1963 G04

–25 0

50 100 125

QUIESCENT CURRENT (mA)

LT1963A-1.5/1.8/-2.5/-3.3

LT1963A

= 6V

= ∞, I

= 0

SHDN

= V

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

= 1mA

Quiescent Current

LT1963A-1.8 Output Voltage

LT1963A-1.5 Output Voltage

TEMPERATURE (°C)

–50

OUTPUT VOLTAGE (V)

1.53

1963 G40

1.50

1.48

–25 0 50

1.47

1.46

1.54

1.52

1.51

1.49

75 100 125

= 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

= 1mA

LT1963A-2.5 Output Voltage

LT1963A-1.5 Quiescent Current

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

1963 G41

= 25°C

= ∞

SHDN

= V

LT1963A Series

1963af

TYPICAL PERFOR A CE CHARACTERISTICS

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

1963 G11

1056789

= 25°C

= ∞

SHDN

= V

LT1963A-3.3 Quiescent Current

INPUT VOLTAGE (V)

QUIESCENT CURRENT (mA)

1963 G12

2010 12 14 16 18

= 25°C

= 4.3k

SHDN

= V

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

1963 G13

1098765

= 25°C

SHDN

= V

*FOR V

OUT

= 1.8V

= 180, I

= 10mA*

= 18, I

= 100mA*

= 6, I

= 300mA*

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

1963 G14

1098765

= 250, I

= 10mA*

= 25, I

= 100mA*

= 8.33, I

= 300mA*

= 25°C

SHDN

= V

*FOR V

OUT

= 2.5V

LT1963A Quiescent Current

LT1963A-1.8 GND Pin Current

LT1963A-2.5 GND Pin Current

LT1963A-1.5 GND Pin Current

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

1963 G42

123

67 9

= 25°C

SHDN

= V

*FOR V

OUT

= 1.5V

= 5, I

= 300mA*

= 15, I

= 100mA*

= 150, I

= 10mA*

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

1963 G16

1098765

= 121, I

= 10mA*

= 12.1, I

= 100mA*

= 4.33, I

= 300mA*

= 25°C

SHDN

= V

*FOR V

OUT

= 1.21V

LT1963A GND Pin Current

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

1963 G15

1098765

= 330, I

= 100mA*

= 33, I

= 100mA*

= 11, I

= 300mA*

= 25°C

SHDN

= V

*FOR V

OUT

= 3.3V

LT1963A-3.3 GND Pin Current

INPUT VOLTAGE (V)

100

GND PIN CURRENT (mA)

1963 G17

0123

678910

= 1.8, I

= 1A*

= 1.2, I

= 1.5A*

= 3.6, I

= 500mA*

= 25°C

SHDN

= V

*FOR V

OUT

= 1.8V

LT1963A-1.8 GND Pin CurrentLT1963A-1.5 GND Pin Current

INPUT VOLTAGE (V)

GND PIN CURRENT (mA)

100

1963 G43

67 9

= 25°C

SHDN

= V

*FOR V

OUT

= 1.5V

= 1, I

= 1.5A*

= 1.5, I

= 1A*

= 3, I

= 500mA*

+ 14 hidden pages