LTC3448_15 datasheet(4/20 Pages) LINER

Part #	LTC3448

Description	1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode

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Manufacturer	LINER [Linear Technology]

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4

LTC3448

3448f

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Input Voltage

Efficiency vs Load Current

Reference Voltage

vs Temperature

Oscillator Frequency

vs Temperature

(From Figure1a Except for the Resistive Divider Resistor Values)

Oscillator Frequency

vs Supply Voltage

Output Voltage vs Load Current

RDS(ON) vs Input Voltage

INPUT VOLTAGE (V)

2

50

55

65

70

75

100

85

3

4

3448 G01

60

90

95

80

5

6

VOUT = 1.8V

TA = 25°C

IOUT = 30mA

IOUT = 600mA

IOUT = 100mA

LOAD CURRENT (A)

30

90

100

20

10

80

50

70

60

40

0.0001

0.01

0.1

1

23448 G02

0

0.001

VOUT = 1.2V

TA = 25°C

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V

LOAD CURRENT (A)

30

90

100

20

10

80

50

70

60

40

0.0001

0.01

0.1

1

23448 G03

0

0.001

VOUT = 1.5V

TA = 25°C

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V

Efficiency vs Load Current

(Switcher Only)

LOAD CURRENT (A)

30

90

100

20

10

80

50

70

60

40

0.0001

0.01

0.1

1

23448 G04

0

0.001

VIN = 2.7V

VOUT = 2.5V

TA = 25°C

TEMPERATURE (

°C)

–50

0.605

0.610

0.615

25

75

3448 G05

0.600

0.595

–25

0

50

100

125

0.590

0.585

VIN = 3.6V

TEMPERATURE (

°C)

–50

1.65

25

3448 G06

1.50

1.40

–25

0

50

1.35

1.30

1.70

1.60

1.55

1.45

75

100

125

VIN = 3.6V

SUPPLY VOLTAGE (V)

2

1.2

1.3

1.4

1.5

1.6

1.7

1.8

TA = 25°C

34

5

6

3448 G07

LOAD CURRENT (A)

0.0001

1.475

1.480

1.490

1.495

1.500

1.525

1.510

0.001

0.01

3448 G08

1.485

1.515

1.520

1.505

0.1

1

VIN = 3.6V

TA = 25°C

INPUT VOLTAGE (V)

2

0.20

0.22

0.26

0.28

0.30

0.40

0.34

3

4

3448 G09

0.24

0.36

0.38

0.32

5

6

TA = 25°C

MAIN

SWITCH

SYNCHRONOUS

SWITCH

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