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 2008 Semtech Corp.

www.semtech.com

SC4603

POWER MANAGEMENT

Applications Information - (Cont.)

Layout Guidelines (Cont.)

8. Maximize the trace width of the loop connecting the

inductor, bottom MOSFET and the output capacitors.

9. Connect the ground of the feedback divider and the

compensation components directly to the GND pin

of the SC4603 by using a separate ground trace.

Then connect this pin to the ground of the output

capacitor as close as possible.

Design Example 1: 3.3V to 1.5V @ 5A application with

SC4603 (NH020 footprint).

Figure 5. Schematic for 3.3V/1.5V @ 5A application

VCC

1

SYNC/SLEEP

2

COMP

3

VSENSE

4

FS

5

ISET

6

PHASE

7

GND

8

NDRV

9

PDRV

10

U1

SC4603

R15

1

C3

4.7u

R2

3.32k

C7

150u

C14

33n

R6

1.0

R5

1.0

R9

6.49k

M2

C10

22u

C11

22u

Vo = 1.5V/5A

C4

22u

RT 21k

C1

150p

C2

820p

R1

20k

R3

L1

1.1u

Vin = 3.3V

C9

820p

R8

604

M1

R7

13k