4

LT1963 Series

1963fa

ELECTRICAL CHARACTERISTICS

TYPICAL PERFOR A CE CHARACTERISTICS

OUTPUT CURRENT (A)

0

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

OUTPUT CURRENT (A)

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

TEST POINTS

TEMPERATURE (

°C)

–50

500

450

400

350

300

250

200

150

100

50

0

0

50

75

1963 G03

–25

25

100

125

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

LT1963-1.8/-2.5/-3.3

LT1963

TEMPERATURE (

°C)

–50

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

TEMPERATURE (

°C)

–50

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

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

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 300

µA 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

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.