LT1962EMS8 データシートの表示（PDF） - Linear Technology

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LT1962EMS8

300mA, Low Noise, Micropower LDO Regulators

Linear Technology 

LT1962 Series

ELECTRICAL CHARACTERISTICS

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 LT1962

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

external resistor divider (two 250k resistors) for an output voltage of

2.44V. The external resistor divider will add a 5µA 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) or VIN = 2.3V

(whichever is greater) and a current source load. This means the device is

tested while operating in its dropout region. This is the worst-case GND

pin current. The GND pin current will decrease slightly 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. This current is

included in the specification for GND pin current.

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 LT1962, LT1962-1.5 and LT1962-1.8 dropout voltage will

be limited by the minimum input voltage specification under some output

voltage/load conditions. See the curve of Minimum Input Voltage in the

Typical Performance Characteristics. For other fixed voltage versions of

the LT1962, the minimum input voltage is limited by the dropout voltage.

TYPICAL PERFOR A CE CHARACTERISTICS

Typical Dropout Voltage

400

350

TJ = 125°C

300

250

200

TJ = 25°C

150

100

50

0

0 50 100 150 200 250 300

OUTPUT CURRENT (mA)

1962 G01

Quiescent Current

50

45

40

35

30

25

20

15 VIN = 6V

10

VSHDN = VIN

RL = ∞, IL = 0 (LT1962-1.5/-1.8

5 /2.5/-3/-3.3/-5)

RL = 250k, IL = 5µA (LT1962)

0

–50 –25 0 25 50 75

TEMPERATURE (°C)

100 125

1962 G04

4

Guaranteed Dropout Voltage

500 = TEST POINTS

450

400

TJ ≤ 125°C

350

300

TJ ≤ 25°C

250

200

150

100

50

0

0 50 100 150 200 250 300

OUTPUT CURRENT (mA)

1962 G02

LT1962-1.5 Output Voltage

1.532

IL = 1mA

1.524

1.516

1.508

1.500

1.492

1.484

1.476

1.468

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1962 G05

Dropout Voltage

400

350

IL = 300mA

300

250

IL = 100mA

200

IL = 50mA

150

100

IL = 10mA

50

0

– 50 – 25

IL = 1mA

0 25 50 75

TEMPERATURE (°C)

100 125

1962 G03

LT1962-1.8 Output Voltage

1.836

IL = 1mA

1.827

1.818

1.809

1.800

1.791

1.782

1.773

1.764

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1962 G06

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