LT1963EQ View Datasheet(PDF) - Linear Integrated System

Part Name

Description

Manufacturer

LT1963EQ

1.5A, Low Noise, Fast Transient Response LDO Regulators

Linear Integrated System 

LT1963 Series

ELECTRICAL CHARACTERISTICS

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 TJ ≈ TA. The LT1963 is 100% tested at

TA = 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: VIN – VDROPOUT.

Note 8: GND pin current is tested with VIN = VOUT(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.

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage

500

450

400

350

TJ = 125°C

300

250

200

TJ = 25°C

150

100

50

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

OUTPUT CURRENT (A)

1963 • G01

Quiescent Current

1.4

1.2

LT1963-1.8/-2.5/-3.3

1.0

0.8

LT1963

0.6

0.4

0.2

VIN = 6V

RL = ∞, IL = 0

VSHDN = VIN

0

– 50 – 25 0 25 50 75

TEMPERATURE (°C)

100 125

1963 G04

4

Guaranteed Dropout Voltage

600

TEST POINTS

500

TJ ≤ 125°C

400

TJ ≤ 25°C

300

200

100

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

OUTPUT CURRENT (A)

LT1963-1.8 Output Voltage

1.84

IL = 1mA

1.83

1963 • G02

1.82

1.81

1.80

1.79

1.78

1.77

1.76

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1963 G05

Dropout Voltage

500

450

400

350

300

IL = 1.5A

250

200

IL = 0.5A

150

100

IL = 100mA

50

0

–50 –25

IL = 1mA

0 25 50 75 100 125

TEMPERATURE (°C)

1963 G03

LT1963-2.5 Output Voltage

2.58

IL = 1mA

2.56

2.54

2.52

2.50

2.48

2.46

2.44

2.42

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

196139G6063fa

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