LX1676

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 8

Mobile AMD Athlon

™ VRM Controller

I N T E GR A T ED

PRODUCT S

Copyright

© 2000

Revision: 0.4b, 9/14/2004

APPLICATION CIRCUITS

LX1676

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2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

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24

25

26

27

28

29

30

31

32

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35

36

37

38

CORE FB-

R6 4.02K

R7 100K

CORE FB-

C5

0.22µF

C4

4700pF

Q1

NDS7002A

Q2

NDS7002A

+5VP

C7 10µF

25V

VBAT

R10 45.3K

PWRGD

EN

R13 100K

R14 100K

R15 100K

R16 100K

R17 100K

2.5V

VID(4)

VID(3)

VID(2)

VID(1)

VID(0)

C2

4700pF

R2 61.9K

C3

4700pF

R3 61.9K

R4 4.02K

R5 4.02K

C8 4.7µF

6.3V

+5VP

C9 4.7µF

6.3V

C10 4.7µF

6.3V

C11 4.7µF

6.3V

Q3

IRF7811W

C12

0.22µF

CR3

UPS5817

+5VP

C13

47µf

6.3v

CR1

SK32

CR2

SK32

L3 70µH

Q4

IRF7811W

FB-

DFOUT

EO1

EA1-

DACOUT

PWRGD

GND

VIN

ROSC

ENA

PGN3

VC3

VC1

HO1

VS1

LO1

PGN

LO2

VCCL

I-MIN

Q5

IRF7811W

Q6

IRF7822

VBAT

C20

10µF

25V

C19

10µF

25V

C21

10µF

25V

C105

10µF

C15

0.22µF

C4

UPS5817

+5VP

Q7

IRF7822

CR8 N/U

L1 3.3µH

Q8

IRF7811W

VBAT

C23

10µF

25V

C22

10µF

25V

C24

10µF

25V

C104

10µF

Q9

IRF7822

Q10

IRF7822

CR7 N/U

L2 3.3µH

C17

0.22µF

CR5

UPS5817

+5VP

C25

VCORE

VCORE

RTN

+5VP

C103

47µF

6.3V

VBAT

C18

10µF

25V

NOTE:

Q7 & Q10 Optional

C25 Several Capacitors Under Processor Socket

Figure 2– Typical VRM Application