LTC3550_15 datasheet(8/24 Pages) LINER

Part #	LTC3550

Description	Dual Input USB/AC Adapter Li-Ion Battery Charger with 600mA Buck Converter

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Manufacturer	LINER [Linear Technology]

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LTC3550

8

3550fa

TEMPERATURE (

°C)

–50

0.4

0.5

0.7

25

75

3550 G32

0.3

0.2

–25

0

50

100

125

0.1

0

0.6

MAIN SWITCH

SYNCHRONOUS SWITCH

VCC = 2.7V

VCC = 3.6V

VCC = 4.2V

VCC (V)

1

0

0.4

0.5

0.7

46

3550 G31

0.3

0.2

23

57

0.1

0

0.6

MAIN

SWITCH

SYNCHRONOUS

SWITCH

TEMPERATURE (

°C)

–50

1.70

1.65

1.60

1.55

1.50

1.45

1.40

1.35

1.30

25

75

–25

0

50

100

125

VCC = 3.6V

3550 G28

Oscillator Frequency

vs Temperature

Buck Regulator Supply

Current vs VCC

Buck Regulator Supply Current

vs Temperature

TYPICAL PERFOR A CE CHARACTERISTICS T

A = 25°C, unless otherwise noted.

Oscillator Frequency vs VCC

VCC (V)

2

1.8

1.7

1.6

1.5

1.4

1.3

1.2

34

5

6

3550 G29

Buck Regulator Output Voltage

vs Load Current

LOAD CURRENT (mA)

0

200 300 400 500 600 700 800

1.844

1.834

1.824

1.814

1.804

1.794

1.784

1.774

3550 G30

100

900

VCC = 3.6V

RDS(ON) vs VCC

Buck Regulator Switches RDS(0N)

vs Temperature

VCC (V)

2

0

5

15

20

25

50

35

3

4

3550 G33

10

40

45

30

5

6

VOUT = 1.875V

ILOAD = 0A

TEMPERATURE (

°C)

–50

0

5

15

20

25

50

35

0

50

75

3550 G34

10

40

45

30

–25

25

100

125

VCC = 3.6V

VOUT = 1.875V

ILOAD = 0A

Buck Regulator Reference

Voltage vs Temperature

Buck Regulator Efﬁciency

vs Output Current

OUTPUT CURRENT (mA)

70

80

85

95

100

0.1

10

100

1000

3550 G26

60

1

90

75

65

VOUT = 2.5V

VCC = 2.7V

VCC = 4.2V

VCC = 3.6V

TEMPERATURE (

°C)

–50

0.614

0.609

0.604

0.599

0.594

0.589

0.584

25

75

–25

0

50

100

125

VCC = 3.6V

3550 G27

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LTC3550 Datasheet(PDF) 8 Page - Linear Technology

LTC3550 Datasheet(HTML) 8 Page - Linear Technology

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