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AN-53

更新时间： 2022-11-25 11:11:44

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		转换器 DC-DC转换器
页数	文件大小	规格书
20页	144K
描述
Implementing an RC5051 DC-DC Converter on Pentium II Motherboards

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AN53

APPLICATION NOTE

Table 2. Intel Pentium II^®Processor Power Speciﬁcations

Voltage Speciﬁcation,

CPU Model, Features

(VDC)

Maximum Current, I_{CC CORE}(A)

CC CORE

Klamath

233MHz

266MHz

300MHz

2.8V +100mV/-60mV

11.8

12.7

14.2

Deschutes

266MHz

300MHz

333MHz

350MHz

400MHz

450MHz

500MHz

2.0V +100mV/-60mV

2.0V +/-60mV

8.5

9.6

10.6

11.1

12.1

14.2

16.0

2.0V +/-60mV

Deschutes Flexible Motherboard

2.0V +/-60mV

18.9

NOTES:

1. Maximum power values are measured at typical V

to take into account the thermal time constant of the CPU package.

CCP

2. Flexible motherboard specifications are recommendations only. Actual specifications are subject to change.

Output Ripple and Noise

Table 3. Output Voltage Programming

Ripple and noise are deﬁned as periodic or random signals

over the frequency band of 0–20MHz at the output pins.

Output ripple and noise must be consistent with voltage

requirements throughout the full load range and under all

speciﬁed input voltage conditions.

Codes (continued)

VID4 VID3 VID2 VID1 VID0 V_OUTto CPU

1.65V

1.70V

1.75V

1.80V

1.85V

1.90V

1.95V

2.00V

2.05V

No CPU

2.1V

Efﬁciency

The efﬁciency of the DC-DC converter must be greater than

80% at maximum output current and greater than 40% at low

current draw.

Processor Voltage Identiﬁcation

There are ﬁve Voltage Identiﬁcation Pins, VID4-VID0, on the

Pentium II processor package which can be used to support

automatic selection of the power supply voltage. These pins are

internally unconnected or are shorted to ground (V ). The

2.2V

logic status of the VID pins deﬁnes the voltage required by the

processor. In order to address future low voltage microproces-

sors, the RC5051 includes a VID4 input bit to extend the output

voltage range as low as 1.3V. The output voltage programming

codes are presented in Table 3. A ‘1’ refers to an open pin and a

‘0’ refers to a short to ground.

2.3V

2.4V

2.5V

2.6V

2.7V

2.8V

Table 3. Output Voltage Programming

Codes

2.9V

3.0V

3.1V

VID4 VID3 VID2 VID1 VID0 V_OUTto CPU

3.2V

1.30V

1.35V

1.40V

1.45V

1.50V

1.55V

1.60V

3.3V

3.4V

3.5V

Note:

1. 0 = processor pin is tied to GND

1 = processor pin is open.

123 4 5 6 7...20

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