LT121IZ-3.3(RevE) Просмотр технического описания (PDF) - Linear Technology

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производитель

LT121IZ-3.3
(Rev.:RevE)

Micropower Low Dropout Regulators with Shutdown

Linear Technology 

LT1121/LT1121-3.3/LT1121-5

ELECTRICAL CHARACTERISTICS

impedance sources or logic running on supply voltages greater than 5.5V,

the maximum current driven into the shutdown pin must be limited to less

than 20mA.

Note 3: For junction temperatures greater than 110°C, a minimum load of

1mA is recommended. For TJ > 110°C and IOUT < 1mA, output voltage

may increase by 1%.

Note 4: 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 5: The LT1121 (adjustable version) is tested and specified with the

adjust pin connected to the output pin.

Note 6: Dropout voltage is the minimum input/output voltage required to

maintain regulation at the specified output current. In dropout the output

voltage will be equal to: (VIN – VDROPOUT).

Note 7: Ground pin current is tested with VIN = VOUT (nominal) and a

current source load. This means that the device is tested while operating in

its dropout region. This is the worst case ground pin current. The ground

pin current will decrease slightly at higher input voltages.

Note 8: Adjust pin bias current flows into the adjust pin.

Note 9: Shutdown pin current at VSHDN = 0V flows out of the shutdown pin.

Note 10: Quiescent current in shutdown is equal to the sum total of the

shutdown pin current (6μA) and the ground pin current (9μA).

Note 11: Reverse output current is tested with the input pin grounded and

the output pin forced to the rated output voltage. This current flows into

the output pin and out of the ground pin.

TYPICAL PERFOR A CE CHARACTERISTICS

Guaranteed Dropout Voltage

0.7

0.6

TJ ≤ 125°C

0.5

0.4

TJ ≤ 25°C

0.3

0.2

0.1

0

0

= TEST POINTS

20 40 60 80 100 120 140 160

OUTPUT CURRENT (mA)

1121 G27

LT1121-3.3

Quiescent Current

120

100

TJ = 25°C

RLOAD = ∞

80

VSHDN = OPEN

60

40

20

VSHDN = 0V

0

0 1 2 3 4 5 6 7 8 9 10

INPUT VOLTAGE (V)

1121 G04

4

Dropout Voltage

0.7

0.6

ILOAD = 150mA

0.5

ILLOAD = 100mA

0.4

0.3

ILOAD = 50mA

0.2

ILOAD = 1mA

0.1

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1121 G14

LT1121-5

Quiescent Current

120

100

TJ = 25°C

RLOAD = ∞

80

VSHDN = OPEN

60

40

20

VSHDN = 0V

0

0 1 2 3 4 5 6 7 8 9 10

INPUT VOLTAGE (V)

1121 G02

Quiescent Current

50

VIN = 6V

RLOAD = ∞

40

VSHDN = OPEN

30

20

VSHDN = 0V

10

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1121 G11

LT1121

Quiescent Current

120

100

TJ = 25°C

RLOAD = ∞

VOUT = VADJ

80

VSHDN = OPEN

60

40

20

VSHDN = 0V

0

0 1 2 3 4 5 6 7 8 9 10

INPUT VOLTAGE (V)

1121 G03

1121fe

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