LTC3675 데이터 시트보기 (PDF) - Linear Technology

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LTC3675

7-Channel Confi gurable High Power PMIC

Linear Technology 

LTC3675

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

500mA Buck Regulators Transient

Response (Pulse-Skipping Mode)

500mA Buck Regulators Transient

Response (Burst Mode Operation)

500mA Buck Regulators No Load

Start-Up Transient

(Pulse-Skipping Mode)

VOUT3

100mV/DIV

AC-COUPLED

VOUT3

100mV/DIV

AC-COUPLED

VIN = 3.6V

VOUT3

500mV/DIV

INDUCTOR

CURRENT

100mA/DIV

50μs/DIV

LOAD STEP = 50mA to 300mA

VIN = 3.6V, VOUT3 = 1.8V

INDUCTOR

CURRENT

100mA/DIV

3675 G19

50μs/DIV

LOAD STEP = 50mA to 300mA

VIN = 3.6V, VOUT3 = 1.8V

INDUCTOR

CURRENT

500mA/DIV

3675 G20

EN

2V/DIV

25μs/DIV

3675 G21

500mA Buck Regulators,

VOUT3 vs Temperature

1.90

PULSE-SKIPPING MODE, LOAD = 250mA

1.88

1.86

1.84

1.82

VIN = 5.5V

1.80

1.78

1.76

VIN = 3.6V

VIN = 2.7V

1.74

1.72

1.70

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

3675 G22

500mA Buck Regulators, PMOS

Current Limit vs Temperature

1.50

1.45

1.40

1.35

1.30

1.25

1.20

VIN = 5.5V

1.15

VIN = 3.6V

1.10

1.05

VIN = 2.7V

1.00

0.95

0.90

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

3675 G23

500mA Buck Regulators, Switch

RDSON vs Temperature

1.0

0.9

PMOS RDSON, VIN = 2.7V

0.8

NMOS RDSON, VIN = 2.7V

0.7

0.6

0.5

0.4

0.3

NMOS RDSON, VIN = 5.5V

0.2

PMOS RDSON, VIN = 5.5V

0.1

0

–55 –35 –15 5 25 45 65 85 105 125

TEMPERATURE (°C)

3675 G24

Ganged Buck Regulators 1 and 2,

Efficiency vs Load

100

95 VIN = 3.6V, VOUT1 = 1.2V

90

85

80

75

Burst Mode OPERATION

70

65

PULSE-SKIPPING MODE

60

55

50

45

40

1

10

100

1000 10000

LOAD CURRENT (mA)

3675 G25

Boost Regulator,

Efficiency vs Load

100

90

80

70

60

50

40

VOUT5 = 5V

30

VIN = 2.7V Burst Mode OPERATION

VIN = 3.6V Burst Mode OPERATION

20

VIN = 1.2V Burst Mode OPERATION

VIN = 2.7V PWM MODE

10

VIN = 3.6V PWM MODE

0

VIN = 4.2V PWM MODE

1

10

100

1000

LOAD CURRENT (mA)

3675 G26

Boost Regulator, Load Regulation

5.20

PWM MODE

5.15

5.10

5.05

VIN = 3.6V

VIN = 4.2V

5.00

4.95

VIN = 2.7V

4.90

4.85

4.80

1

10

100

LOAD CURRENT (mA)

1000

3675 G27

3675f

10

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