LT1763(1999) Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LT1763
(Rev.:1999)

500mA, Low Noise, LDO Micropower Regulators

Linear Technology 

LT1763 Series

ELECTRICAL CHARACTERISTICS

Note 6: 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 7: 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 8: ADJ pin bias current flows into the ADJ pin.

Note 9: SHDN pin current flows into the SHDN pin.

Note 10: 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 11: For the LT1763, LT1763-1.5 and LT1763-1.8 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.

TYPICAL PERFORMANCE CHARACTERISTICS

Typical Dropout Voltage

500

450

400

TJ = 125°C

350

300

250

200

TJ = 25°C

150

100

50

0

0 50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT (mA)

1763 G01

Quiescent Current

50

45

40

35

VSHDN = VIN

30

25

20

15

10 VIN = 6V

5 RL = ∞, IL = 0 (LT1763-1.5/-1.8/-2.5/-3/-3.3/-5)

RL = 250k, IL = 5µA (LT1763)

0

–50 –25 0 25 50 75 100 125

TEMPERATURE (°C)

1763 G04

Guaranteed Dropout Voltage

500

= TEST POINTS

450

400

350

TJ ≤ 125°C

300

250

TJ ≤ 25°C

200

150

100

50

0

0 50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT (mA)

1763 G02

LT1763-1.5

Output Voltage

1.528

IL = 1mA

1.521

1.514

1.507

1.500

1.493

1.486

1.479

1.472

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1763 G50

Dropout Voltage

500

450

IL = 500mA

400

IL = 250mA

350 IL = 100mA

300

250

200

150

100

50

0

–50

IL = 50mA IL = 10mA

–25 0 25 50 75

TEMPERATURE (°C)

IL = 1mA

100 125

1763 G03

LT1763-1.8

Output Voltage

1.84

IL = 1mA

1.83

1.82

1.81

1.80

1.79

1.78

1.77

1.76

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1763 G51

1763fa

4

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