SC1480A Просмотр технического описания (PDF) - Semtech Corporation

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SC1480A

DDR and DDR Memory VTT power Supply Controller

Semtech Corporation 

SC1480A

POWER MANAGEMENT

Application Information (Cont.)

The layout can be considered in two parts, the control section referenced to VSSA and the power section. Looking

at the control section first, locate all components referenced to VSSA on the schematic and place these components

at the chip. Connect VSSA using either a wide (>0.020”) trace or a copper pour if room allows. Very little current

flows in the chip ground therefore large areas of copper are not needed.

5VRUN

C7

0u1

0402

R6

10k0

0402

C2

1u

0402

C8

1n

0402

R7

10R

0402

C9

1u

0603

U1

1

REFIN

2

TON

3 REFOUT

4 VCCA

5 FB

6 PGD

7 VSSA

SC1480A

14

BST

13

DH

LX 12

ILIM 11

VDDP 10

DL 9

PGND 8

C10

1u

0603

.igure 4: Components Connected to VSSA

.igure 5: Example VSSA 0.020” Trace

In .igure 5 above, all components referenced to VSSA have been placed and connected using a 0.020” trace.

Decoupling capacitors C9 and C10 are as close as possible to their pins. C10 should connect to the PGND plane

using two vias.

 2003 Semtech Corp.

15

www.semtech.com

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