LTC3728LXC(RevA) 查看數據表（PDF） - Linear Technology

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LTC3728LXC
(Rev.:RevA)

Dual, 550kHz, 2-Phase Synchronous Regulators

Linear Technology 

LTC3728L/LTC3728LX

TYPICAL PERFOR A CE CHARACTERISTICS

Input Source/Capacitor

Instantaneous Current (Figure 13)

Burst Mode Operation (Figure 13)

Constant Frequency (Burst Inhibit)

Operation (Figure 13)

IIN

2A/DIV

VIN

200mV/DIV

VSW1

10V/DIV

VSW2

10V/DIV

VOUT

20mV/DIV

IL

0.5A/DIV

VOUT

20mV/DIV

IL

0.5A/DIV

VIN = 15V

1µs/DIV

VOUT1 = 5V, VOUT2 = 3.3V

VPLLFLTR = 0V

IOUT5 = IOUT3.3 = 2A

3728L G22

VIN = 15V

VOUT = 5V

VPLLFLTR = 0V

VFCB = OPEN

IOUT = 20mA

10µs/DIV

3728L G23

VIN = 15V

VOUT = 5V

VPLLFLTR = 0V

VFCB = 5V

IOUT = 20mA

2µs/DIV

3728L G24

Current Sense Pin Input Current

vs Temperature

35

VOUT = 5V

33

31

EXTVCC Switch Resistance

vs Temperature

10

8

6

Oscillator Frequency

vs Temperature

700

600

VPLLFLTR = 2.4V

500

VPLLFLTR = 1.2V

400

29

4

300

VPLLFLTR = 0V

200

27

2

100

25

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3728L G26

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3728L G27

0

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

3728L 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

3728L G29

Shutdown Latch Thresholds

vs Temperature

4.5

LATCH ARMING

4.0

3.5

LATCHOFF

3.0

THRESHOLD

2.5

2.0

1.5

1.0

0.5

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3728L G30

3728lxfa

7

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