LTC3561 Ver la hoja de datos (PDF) - Linear Technology

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componentes Descripción

Fabricante

LTC3561

1A, 4MHz, Synchronous Step-Down DC/DC Converter

Linear Technology 

LTC3561

ELECTRICAL CHARACTERISTICS

Note 5: TJ is calculated from the ambient TA and power dissipation PD

according to the following formula:

LTC3561EDD: TJ = TA + (PD • 43°C/W)

Note 6: Switch on-resistance is guaranteed by correlation to wafer level

measurements.

Note 7: 4MHz operation is guaranteed by design but not production tested

and is subject to duty cycle limitations (see Applications Information).

Note 8: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

TYPICAL PERFOR A CE CHARACTERISTICS

Switching Waveforms

VOUT

10mV/

DIV

IL1

100mA/

DIV

VIN = 3.3V

2µs/DIV

VOUT = 2.5V

ILOAD = 50mA

CIRCUIT OF FIGURE 6

3561 G02.eps

Efficiency vs VIN

100

IOUT = 0.4A

95

90

IOUT = 1.0A

85

Load Step

VOUT

100mV/

DIV

80

75

70

65 VOUT = 2.5V

CIRCUIT OF FIGURE 6

60

2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

VIN (V)

3561 G05

IL1

0.4A/

DIV

VIN = 3.3V

40µs/DIV

VOUT = 2.5V

ILOAD = 0.20A TO 1A

CIRCUIT OF FIGURE 6

3561 G06.eps

Load Regulation

0.4

0.3

VIN = 3.3V

VOUT = 2.5V

0.2

0.1

0

–0.1

–0.2

–0.3

–0.4

–0.5

1

10

100

1000

LOAD CURRENT (mA)

10000

3561 G07

Line Regulation

0.50

VOUT = 1.8V

0.45 TA = 25°C

0.40

0.35

0.30

0.25

0.20

IOUT = 1.0A

0.15

0.10

IOUT = 400mA

0.05

0

2

3

4

5

6

VIN (V)

3561 G08

Frequency vs VIN

10

VOUT = 1.8V

8 IOUT = 1A

6 TA = 25°C

4

2

0

–2

–4

–6

–8

–10

2

3

4

VIN (V)

5

6

3561 G09

3561f

3

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