LTC3521 datasheet(5/20 Pages) LINER

Part #	LTC3521

Description	Wide VIN, 1A Buck-Boost DC/DC and Dual 600mA Buck DC/DC Converters

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Manufacturer	LINER [Linear Technology]

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LTC3521

3521f

Buck-Boost Feedback Voltage

vs Temperature

Typical perForMance characTerisTics

Buck Feedback Voltage

vs Temperature

Buck-Boost Maximum Load

Current, Burst Mode Operation

No Load Quiescent Current

vs VIN

Switching Frequency vs VIN

Buck-Boost Maximum Load

Current, PWM Mode

100

500

900

1300

300

700

1100

1500

VIN (V)

3521 G13

VOUT = 3.3V

L = 4.7µH

VOUT = 5V

1.8

5.3

2.8

3.8

2.3

3.3

4.3

4.8

100µs/DIV

VOUT

100mV/DIV

INDUCTOR

CURRENT

500mA/DIV

3521 G15

VIN = 3.6V, VOUT = 3.3V

L = 4.7µH

COUT = 22µF

Buck-Boost Load Step,

0mA to 750mA

TA = 25°C, unless otherwise noted.

Burst Mode Quiescent Current

vs VIN

VIN (V)

1.8

1.0

1.5

5.3

0.5

0

2.8

3.8

2.3

3.3

4.3

4.8

–1.5

–2.0

–0.5

2.0

–1.0

3521 G08

TEMPERATURE (°C)

–40

0.1

100

0

–0.1

0

40

–20

20

60

120

80

–0.4

–0.5

–0.2

0.2

–0.3

3521 G09

TEMPERATURE (°C)

–0.1

0

0.1

–0.2

–0.3

–0.4

–0.5

0.2

3521 G10

–50 –25

25

0

50

75

100 125

VIN (V)

1.8

5.3

31

2.8

3.8

2.3

3.3

4.3

4.8

25

29

33

27

3521 G11

ALL THREE CONVERTERS ENABLED

VIN (V)

1.8

60

70

80

5.3

50

40

2.8

3.8

2.3

3.3

4.3

4.8

10

0

30

90

20

3521 G12

VOUT = 3V

VOUT = 5V

VIN (V)

1.8

5.3

2.8

3.8

2.3

3.3

4.3

4.8

45

40

55

60

50

3521 G14

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