LTC3621-2_15 datasheet(5/18 Pages) LINER

Part #	LTC3621-2

Description	17V, 1A Synchronous Step-Down Regulator with 3.5A Quiescent Current

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3621/LTC3621-2

5

3621fc

For more information www.linear.com/LTC3621

Typical perForMance characTerisTics

Burst Mode Operation

Pulse-Skipping Mode Operation

Load Step

Soft-Start Operation

Efficiency vs Input Voltage

Oscillator Frequency

vs Temperature

Efficiency vs Load Current

(Burst Mode Operation)

VIN Supply Current

vs Input Voltage

Efficiency vs Load at Dropout

Operation

TJ = 25°C, unless otherwise noted.

INPUT VOLTAGE (V)

0

3

4

5

16

3621 G02

2

1

0

2

4

6

8 10 12 14

18 20

SLEEP

SD

3621 G04

SW

5V/DIV

4µs/DIV

VOUT

AC-COUPLED

50mV/DIV

IL

500mA/DIV

VIN = 12V

VOUT = 3.3V

Burst Mode OPERATION

IOUT = 50mA

L = 2.2µH

3621 G07

RUN

5V/DIV

PGOOD

2V/DIV

VOUT

1V/DIV

IL

0.5A/DIV

400µs/DIV

3621 G05

SW

5V/DIV

VOUT

AC-COUPLED

50mV/DIV

IL

500mA/DIV

VIN = 12V

VOUT = 3.3V

PULSE SKIP MODE

IOUT = 10mA

L = 2.2µH

4µs/DIV

3621 G06

ILOAD

500mA/DIV

VOUT

100mV/DIV

IL

500mA/DIV

VIN = 12V

VOUT = 3.3V

ILOAD = 0.05A

40µs/DIV

LOAD CURRENT (A)

3621 G01

100

90

80

70

60

50

40

30

20

10

0

0.001

0.1

1

0.01

VIN = 12V

FREQUENCY = 2.25MHz

VOUT = 2.5V

VOUT = 3.3V

VOUT = 5V

LOAD CURRENT (A)

3621 G03

100

90

80

70

60

50

40

30

20

10

0

0.0001

0.001

0.1

1

0.01

VIN = 5V

FREQUENCY = 2.25MHz

FORCED

CONTINUOUS

MODE

Burst Mode

OPERATION

TEMPERATURE (°C)

–50

2.30

2.35

2.45

2.50

2.40

25

75 100

3621 G09

2.25

2.20

–25

0

50

125 150

2.15

2.05

2.00

2.10

INPUT VOLTAGE (V)

0

70

5

96

3621 G08

10

15

20

94

92

90

88

86

84

82

80

78

76

74

72

VOUT = 2.5V

ILOAD = 10mA

ILOAD = 1A

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LTC3621-2 Datasheet(PDF) 5 Page - Linear Technology

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Similar Part No. - LTC3621-2_15

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