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 2005 Semtech Corp.

www.semtech.com

SC1485

POWER MANAGEMENT

VOUT2

VOUT

VSSA2

VSSA1

VOUT1

VOUT

VOUT2

0402

0402

C15

56p

0402

R12 0R (2)

0402

7343

+

C16

220u/25m

7343

VOUT2

EN/PSV1

22

TON1

23

VOUT1

24

VCCA1

25

FB1

26

PGD1

27

VSSA1

28

PGND1

1

DL1

2

VDDP1

3

ILIM1

4

LX1

5

DH1

6

BST1

7

EN/PSV2

8

TON2

9

VOUT2

10

VCCA2

11

FB2

12

PGD2

13

VSSA2

14

PGND2

15

DL2

16

VDDP2

17

ILIM2

18

LX2

19

DH2

20

BST2

21

U1

SC1485

R4

R3

+

C3

VOUT1

0402

0402

C7

0402

0402

R6 0R (2)

7343

7343

+

C8

VOUT1

VSSA2

VSSA2

VSSA1

VSSA1

R9

20k0

R13

20k0

+

C17

220u/25m

Figure 11: Differential Routing of Feedback and Ground Reference Traces

In Figure 11, VOUT1 and VSSA1 are routed as a differential pair from the output capacitors back to the feedback

components and device. Similarly, VOUT2 and VSSA2 are routed as a differential pair from the output capacitors

back to the feedback components and device.