18

 2006 Semtech Corp.

www.semtech.com

SC1486A

POWER MANAGEMENT

Application Information (Cont.)

Layout Guidelines (Cont.)

5VSUS

0402

C1

2n2/50V

Q2

IRF7811AV

1

2

3

4

5

6

7

8

S

S

S

G

D

D

D

D

SOD

0402

7343

0603

0402

323

R5 13k3

C2

0u1/25V

0603

R3

1M

R13

17k4

C10 0u1

D1

0402

R10

45k3

1210

+

C14

330u/25m

C20

1n

1.8V

0402

L1

2u4

5VSUS

C17

27p

PGOOD1

VCCA1

0402

R1 10R

VCCA1

0603

0603

VCCA1

R7

0R

0402

C3

10u/25V

U1

SC1486A

3

1

23

6

7

5

4

22

27

24

26

25

28

17

15

9

20

21

19

18

13

12

8

10

11

14

2

16

VDDP1

PGND1

TON1

DH1

BST1

LX1

ILIM1

EN/PSV1

PGD1

VOUT1

FB1

VCCA1

VSSA1

VDDP2

PGND2

TON2

DH2

BST2

LX2

ILIM2

PGD2

FB2

REFIN

REFOUT

VCCA2

VSSA2

DL1

DL2

C4

10u/25V

C21

1u

TON1

C8

1u

0402

0402

7343

+

C13

330u/25m

PGD1

R14 470k

Q3

FDS6676S

1

2

3

4

5

6

7

8

S

S

S

G

D

D

D

D

VSSA1

0402

0402

1.8V, 10A

PWR_SRC

1210

C12

0u1

Figure 5: VDDQ Side Detail

Note R7 is present to facilitate isolation of power ground and VSSA1 during layout

0603

PWR_SRC

L2

3u9

0.9V

0402

R2 10R

D2

0402

C9

1u

0402

1.8V

R11 10R

C19

0u1

7343

+

C15

220u/25m

R9 10k0

C6

0u1/25V

0603

0603

C16

0u1

PGD2

C11 0u1

U1

SC1486A

3

1

23

6

7

5

4

22

27

24

26

25

28

17

15

9

20

21

19

18

13

12

8

10

11

14

2

16

VDDP1

PGND1

TON1

DH1

BST1

LX1

ILIM1

EN/PSV1

PGD1

VOUT1

FB1

VCCA1

VSSA1

VDDP2

PGND2

TON2

DH2

BST2

LX2

ILIM2

PGD2

FB2

REFIN

REFOUT

VCCA2

VSSA2

DL1

DL2

Q1

FDS6982S

4

1

2

3

5

6

7

8

C5

10u/25V

0402

0402

0402

0402

R4

649k

R8

0R

C22

1u

R15 470k

SOD

5VSUS

0.9V, 1.5A

REFOUT

5VRUN

1210

C7

2n2/50V

0603

0402

323

0402

TON2

C23

1n

0603

0402

PGOOD2

VSSA2

C18

1u

VCCA2

VCCA2

R12

10k0

R6 4k32

0402

0402

Figure 6: VTT Side Detail

Note R8 is present to facilitate isolation of power ground and VSSA2 during layout