ADP1871 datasheet(12/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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12 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 12 of 44

1000

1450

1400

1350

1300

1250

1200

1150

1100

1050

0

8000

800

1600 2400 3200 4000 4800 5600 6400 7200

LOAD CURRENT (mA)

VIN = 16.5V

VIN = 13V

+125°C

+25°C

–40°C

Figure 34. Frequency vs. Load Current, 1.0 MHz, VOUT = 5 V

2.649

2.658

2.657

2.656

2.655

2.654

2.653

2.652

2.651

2.650

–40

120

100

80

60

40

20

0

–20

TEMPERATURE (°C)

Figure 35. UVLO vs. Temperature

55

60

65

70

75

80

85

90

95

300

400

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800

900

1000

FREQUENCY (kHz)

+125°C

+25°C

–40°C

Figure 36. Maximum Duty Cycle vs. Frequency

62

64

66

68

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74

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82

5.5

6.7

7.9

9.1

10.3

11.5

12.7

13.9

15.1

16.3

VIN (V)

+125°C

+25°C

–40°C

Figure 37. Maximum Duty Cycle vs. High Voltage Input (VIN)

180

680

630

580

530

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430

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330

280

230

–40

120

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80

60

40

20

0

–20

TEMPERATURE (°C)

VREG = 2.7V

VREG = 5.5V

VREG = 3.6V

Figure 38. Minimum Off-Time vs. Temperature

180

680

630

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530

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2.7

5.5

5.1

4.7

4.3

3.9

3.5

3.1

VREG (V)

+125°C

+25°C

–40°C

Figure 39. Minimum Off-Time vs. VREG (Low Input Voltage)

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ADP1871 Datasheet(PDF) 12 Page - Analog Devices

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