LTC1708EG-PG 查看數據表（PDF） - Linear Technology

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LTC1708EG-PG

Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck DC/DC Controller

Linear Technology 

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1708-PG

Soft-Start Up (Figure 13)

Burst Mode Operation (Figure 13)

Constant Frequency (Burst Inhibit)

Operation (Figure 13)

VRUN/SS

2V/DIV

VOUT

1V/DIV

IOUT

5A/DIV

VIN = 15V

VOUT2 = 1.6V

100ms/DIV

VOUT

20mV/DIV

1708 G19

IOUT

5A/DIV

VIN = 15V

VOUT2 = 1.6V

VFCB = OPEN

IOUT = 250mA

20µs/DIV

VOUT

20mV/DIV

1708 G23

IOUT

2A/DIV

VIN = 15V

VOUT2 = 1.6V

VFCB = VINTVCC

IOUT = 250mA

20µs/DIV

1708 G24

Current Sense Input Current

vs Temperature

35

33

31

EXTVCC Switch Resistance

vs Temperature

10

8

6

Oscillator Frequency

vs Temperature

350

VFREQSET = 2.4V

300

250

VFREQSET = OPEN

200

29

4

150

VFREQSET = 0V

100

27

2

50

25

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1708 G26

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1708 G27

0

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1708 G28

Undervoltage Lockout

vs Temperature

3.50

3.45

3.40

3.35

3.30

3.25

3.20

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1708 G29

Shutdown Latch Thresholds

vs Temperature

4.5

4.0

LATCH ARMING

3.5

3.0

LATCHOFF

THRESHOLD

2.5

2.0

1.5

1.0

0.5

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1708 G30

1708f

7

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