NCP81255MNTXG datasheet(11/19 Pages) ONSEMI

Part #	NCP81255MNTXG

Description	Single?륯hase Voltage Regulator

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NCP81255

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GENERAL

The NCP81255 is a single phase IMVP8 Intel proprietary

interface controller with a built in gate driver. The controller

makes use of a digitally enhanced high performance current

mode RPM control method that provides excellent transient

response while minimizing transient aliasing. The average

operating frequency is digitally stabilized to remove

frequency drift under all continuous mode operating

conditions. At light load the NCP81255 automatically

transitions into DCM operation to save power.

Serial VID Interface (Intel proprietary interface)

For Intel proprietary interface communication details

please contact Intel®, Inc.

Switching Frequency, Intel proprietary interface

Address, and Boot Voltage Programming

FSW, address, and VBOOT are during power up on

a single pin. A 10

mA current is sourced from the pin and the

resulting voltage is measured. This is compared with the

thresholds and the corresponding values for FSW, VBOOT,

and Intel proprietary interface address are configured. These

values are programmed on power up and cannot be changed

after the initial power up sequence is complete.

Table 5. SWITCHING FREQUENCY

Resistor

FSW

Address

VBOOT

1

10 k

W

1.2 MHz

0

0V

2

13 k

W

1.1 MHz

0

0V

3

16 k

W

1.0 MHz

0

0V

4

19.2 k

W

900 kHz

0

0V

5

22.5 k

W

800 kHz

0

0V

6

26 k

W

700 kHz

0

0V

7

29.6 k

W

600 kHz

0

0V

8

33.5 k

W

1.2 MHz

1

0V

9

37.4 k

W

1.1 MHz

1

0V

10

41.5 k

W

1.0 MHz

1

0V

11

45.8 k

W

900 kHz

1

0V

12

50.2 k

W

800 kHz

1

0V

13

54.8 k

W

700 kHz

1

0V

14

59.5 k

W

600 kHz

1

0V

15

64.5 k

W

1.2 MHz

2

1.05 V

16

69.6 k

W

1.1 MHz

2

1.05 V

17

75 k

W

1.0 MHz

2

1.05 V

18

80.6 k

W

900 kHz

2

1.05 V

19

86.5 k

W

800 kHz

2

1.05 V

20

92.6 k

W

700 kHz

2

1.05 V

21

99 k

W

600 kHz

2

1.05 V

22

105.5 k

W

1.2 MHz

3

0V

23

112.5 k

W

1.1 MHz

3

0V

24

119.6 k

W

1.0 MHz

3

0V

25

127 k

W

900 kHz

3

0V

26

134.8 k

W

800 kHz

3

0V

27

143 k

W

700 kHz

3

0V

28

151.4 k

W

600 kHz

3

0V

29

160.3 k

W

700kHz

0

1.05 V

30

169.5 k

W

700kHz

1

1.05 V

31

180 k

W

700 kHz

2

0V

32

210 k

W

700 kHz

3

1.05 V

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