ADP1879 데이터 시트보기 (PDF) - Analog Devices

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ADP1879

Synchronous Buck Controller with Constant On Time and Valley Current Mode

Analog Devices 

Data Sheet

800

720

VREG = 2.7V

VREG = 3.6V

VREG = 5.5V

+125°C

+25°C

–40°C

640

560

480

400

320

240

160

80

300

400

500

600

700

800

900

FREQUENCY (kHz)

Figure 40. Internal Rectifier Drop vs. Frequency

1000

1280

1200

1120

1040

VIN = 5.5V

VIN = 13V

VIN = 16.5V

1MHz

300kHz

TA = 25°C

960

880

800

720

640

560

480

400

320

240

160

80

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

VREG (V)

Figure 41. Internal Boost Rectifier Drop vs. VREG (Low Input Voltage)

Over VIN Variation

720

300kHz

1MHz

640

+125°C

+25°C

–40°C

560

480

400

320

240

160

80

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

VREG (V)

Figure 42. Internal Boost Rectifier Drop vs. VREG

ADP1878/ADP1879

80

300kHz

+125°C

72

1MHz

+25°C

–40°C

64

56

48

40

32

24

16

8

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

VREG (V)

Figure 43. Low-Side MOSFET Body Diode Conduction Time vs. VREG

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

SW NODE

3

LOW SIDE

4

CH1 50mV BW CH2 5A Ω M400ns

CH3 10V BW CH4 5V

T 35.8%

A CH2

3.90A

Figure 44. Power Saving Mode (PSM) Operational Waveform, 100 mA

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

SW NODE

3

LOW SIDE

4

CH1 50mV BW CH2 5A Ω M4.0µs

CH3 10V BW CH4 5V

T 35.8%

A CH2

3.90A

Figure 45. PSM Waveform at Light Load, 500 mA

Rev. B | Page 13 of 40

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