LT3505IMS8E-TRPBF データシートの表示（PDF） - Linear Technology

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LT3505IMS8E-TRPBF

1.2A, Step-Down Switching Regulator in 3mm ×3mm DFN

Linear Technology 

TYPICAL PERFORMANCE CHARACTERISTICS

Undervoltage Lockout

4.00

3.90

3.80

3.70

3.60

3.50

3.40

3.30

3.20

3.10

3.00

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3505 G10

Switching Frequency

2.40

2.20

RT = 21k

2.00

1.80

1.60

RT = 30.1k

1.40

1.20

1.00

0.80

RT = 75.0k

0.60

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

Soft-Start

2.0

1.8 TA = 25°C

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

0 0.25 0.50 0.75 1 1.25 1.50 1.75 2

SHDN PIN VOLTAGE (V)

Typical Minimum Input Voltage,

(VOUT = 3.3V, fSW = 750kHz)

5.5

TA = 25°C

5.3

5.1 TO START

4.9

4.7

4.5

4.3

4.1 TO RUN

3.9

3.7

3.5

1

10

100

LOAD CURRENT (mA)

1000

SHDN Pin Current

50 TA = 25°C

45

40

35

30

25

20

15

10

5

0

0 2 4 6 8 10 12 14 16 18 20

VSHDN (V)

3505 G14

Typical Minimum Input Voltage,

(VOUT = 3.3V, fSW = 2.2MHz)

5.5 TA = 25°C

TO START

5.0

4.5

TO RUN

4.0

3.5

1

10

100

LOAD CURRENT (mA)

1000

LT3505

Frequency Foldback, RT = 75.0k

0.6 TA = 25°C

0.5

0.4

0.3

0.2

0.1

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

FB VOLTAGE (V)

3505 G12

Typical Minimum Input Voltage,

(VOUT = 5V, fSW = 750kHz)

7.2

7.0

TO START

6.8

TA = 25°C

6.6

6.4

6.2

6.0

5.8 TO RUN

5.6

5.4

5.2

1

10

100

LOAD CURRENT (mA)

1000

3505 G15

Typical Minimum Input Voltage,

(VOUT = 5V, fSW = 2.2MHz)

7.0

6.8 TO START

6.6

6.4 TO RUN

6.2

6.0

5.8

5.6

5.4

5.2

5.0 TA = 25°C

1

10

100

LOAD CURRENT (mA)

1000

3505fc

5

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