LTC3727EUH-1 查看數據表（PDF） - Linear Technology

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LTC3727EUH-1

High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

Linear Technology 

LTC3727/LTC3727-1

TYPICAL PERFOR A CE CHARACTERISTICS

SENSE Pins Total Source Current

100

50

0

–50

–100

–150

–200

–250

–300

–350

–400

0

5

10

15

VSENSE COMMON MODE VOLTAGE (V)

3727 G13

Soft-Start Up (Figure 13)

Dropout Voltage vs Output Current

(Figure 13)

1.4

VOUT = 5V

1.2

1.0

RSENSE = 0.015Ω

0.8

0.6

0.4

0.2

0

0

RSENSE = 0.010Ω

1

2

3

4

5

OUTPUT CURRENT (A)

3727 G14

Load Step (Figure 13)

RUN/SS Current vs Temperature

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3727 G15

Load Step (Figure 13)

IOUT

5A/DIV

VOUT

5V/DIV

VRUN/SS

5V/DIV

VOUT

200mV/DIV

IOUT

2A/DIV

VOUT

200mV/DIV

IOUT

2A/DIV

VIN = 20V

VOUT = 12V

50ms/DIV

3727 G16

VIN = 15V

50µs/DIV

VOUT = 12V

LOAD STEP = 0A TO 3A

Burst Mode OPERATION

3727 G17

VIN = 15V

50µs/DIV

VOUT = 12V

LOAD STEP = 0A TO 3A

CONTINUOUS MODE

3727 G18

Input Source/Capacitor

Instantaneous Current (Figure 13)

Burst Mode Operation (Figure 13)

Constant Frequency (Burst Inhibit)

Operation (Figure 13)

IIN

1A/DIV

VSW1

20V/DIV

VSW2

20V/DIV

VIN = 15V

VOUT1 = 12V

VOUT2 = 5V

IOUT1 = IOUT2 = 2A

1µs/DIV

VOUT

20mV/DIV

VOUT

20mV/DIV

3727 G19

IOUT

0.5A/DIV

VIN = 15V

VOUT = 12V

VFCB = OPEN

IOUT = 20mA

50µs/DIV

3727 G20

IOUT

0.5A/DIV

VIN = 15V

VOUT = 12V

VFCB = 7.5V

IOUT = 20mA

5µs/DIV

3727 G21

3727f

6

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