LTC3577 datasheet(9/38 Pages) LINER

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LTC3675

3675fa

TYPICAL PERFORMANCE CHARACTERISTICS

1A Buck Regulators,

VOUT1 vs Temperature

1A Buck Regulators, PMOS

Current Limit vs Temperature

1A Buck Regulators, Switch

RDSON vs Temperature

500mA Buck Regulators,

Efﬁciency vs Load

500mA Buck Regulators,

Load Regulation

500mA Buck Regulators,

Line Regulation

1A Buck Regulators, Transient

Response (Pulse-Skipping Mode)

1A Buck Regulators, Transient

Response (Burst Mode Operation)

1A Buck Regulators, No Load

Start-Up Transient

(Pulse-Skipping Mode)

25μs/DIV

VOUT1

500mV/DIV

INDUCTOR

CURRENT

500mA/DIV

EN1

2V/DIV

3675 G12

VIN = 3.6V

TEMPERATURE (°C)

3.6

3.2

3.4

2.8

3.0

2.2

2.0

2.6

2.4

1.8

1.6

–15

–35

3675 G14

85 105 125

–55

VIN = 3.6V

VIN = 5.5V

VIN = 2.7V

TEMPERATURE (°C)

0.60

0.50

0.55

0.40

0.45

0.25

0.20

0.35

0.30

0.15

0.10

0.05

–15

–35

3675 G15

85 105 125

–55

NMOS RDSON, VIN = 5.5V

NMOS RDSON, VIN = 2.7V

PMOS RDSON, VIN = 5.5V

PMOS RDSON, VIN = 2.7V

50μs/DIV

VOUT1

100mV/DIV

AC-COUPLED

INDUCTOR

CURRENT

200mA/DIV

0mA

LOAD STEP = 100mA TO 700mA

VIN = 3.6V, VOUT1 = 1.2V

3675 G10

50μs/DIV

VOUT1

100mV/DIV

AC-COUPLED

INDUCTOR

CURRENT

200mA/DIV

0mA

3675 G11

LOAD STEP = 100mA TO 700mA

VIN = 3.6V, VOUT1 = 1.2V

LOAD CURRENT (mA)

100

3675 G16

1000

100

VIN = 2.7V Burst Mode OPERATION

VIN = 3.6V Burst Mode OPERATION

VIN = 5.5V Burst Mode OPERATION

VIN = 2.7V PULSE SKIPPING-MODE

VIN = 3.6V PULSE SKIPPING-MODE

VIN = 5.5V PULSE SKIPPING-MODE

VOUT3 = 1.8V

LOAD CURRENT (mA)

1.830

1.820

1.825

1.810

1.815

1.795

1.790

1.805

1.800

1.785

1.780

1.775

1.770

100

3675 G17

1000

VIN = 5.5V

VIN = 2.7V

PULSE-SKIPPING MODE

VIN = 3.6V

VIN (V)

1.830

1.810

1.820

1.825

1.815

1.790

1.800

1.805

1.770

1.795

1.785

1.780

1.775

3.5

3.1

3675 G18

3.9

4.3

5.1

5.5

2.7

4.7

LOAD = 250mA

PULSE-SKIPPING MODE

LOAD = 50mA

TEMPERATURE (°C)

1.25

1.23

1.24

1.21

1.22

1.18

1.17

1.20

1.19

1.16

1.15

–15

–35

3675 G13

85 105 125

–55

VIN = 3.6V

VIN = 5.5V

VIN = 2.7V

PULSE-SKIPPING MODE

LOAD = 500mA

TA = 25°C, unless otherwise noted.

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