SC4603 Ver la hoja de datos (PDF) - Semtech Corporation

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SC4603

Very Low Input, MHz Operation, High Efficiency Synchronous Buck

Semtech Corporation 

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).

RT 21k

C3 4.7u

C1 150p

R1

C2

20k

820p

R15

1

R3

R2

3.32k

U1

5 FS

ISET 6

1 VCC

PDRV 10

2 SY NC/SLEEPPHASE 7

3 COMP

NDRV 9

4 VSENSE

GND 8

SC4603

C14

M1

33n

R6

1.0

M2

R5

1.0

SC4603

Vin = 3.3V

C10

C11

22u

22u

L1

1.1u

C7

C4

150u

22u

Vo = 1.5V/5A

C9

820p

R7

13k

R8

604

R9

6.49k

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

 2008 Semtech Corp.

13

www.semtech.com

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