FAN4855 datasheet(5/12 Pages) FAIRCHILD

Il numero della parte	FAN4855

Spiegazioni elettronici	500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect

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Produttore elettronici	FAIRCHILD [Fairchild Semiconductor]

Homepage	http://www.fairchildsemi.com

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FAN4855 Rev. 1.0.1

Typical Operating Characteristics (L = 10µH, CIN = 47µF, COUT = 47µF/1.0µF, T = 25°C)

Load Current vs. Start-Up Voltage

(Resistive Load)

Input Voltage, V

Efficiency vs. Load Current

Vout = 3.3V

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0.1

1

10

100

1000

Output Current, mA

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

100.0

0.1

1

10

100

1000

Output Current, mA

Efficiency vs. Load Current

Vout = 5V

SHDN Threshold Voltage

Input Voltage, V

Vin=2.0V

Vin=3V

Vin=1.5V

Vin=3V

Vin=2.0V

Vin=1.5V

0

100

200

300

400

500

600

1.5

2

2.5

3

3.5

4

VOUT = 5V

VOUT = 3.3V

0.5

0.7

0.9

1.1

1.3

1.5

1.7

1.9

2.1

2.3

1.5

2

2.5

3

3.5

4

4.5

Starting Up and Turning Off

VOUT = 3.3V, Iloads = 10mA to 50mA

Input Voltage, V

Starting Up and Turning Off

VOUT = 5V, Iloads = 10mA to 50mA

0

0.5

1

1.5

2

2.5

3

3.5

4

0.6

0.8

1.01.2

1.41.6

1.8

Input Voltage, V

0.6

0.8

1.0

1.2

1.4

1.6

1.8

START UP

TURN OFF:

Iload=50mA

Iload=10mA

Iload=10mA to 50mA

1

0

2

3

4

5

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