SS7529 datasheet(7/8 Pages) SSC

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SS7529

Rev.1.01 4/26/2004

Layout Hints

There are some principles which should be followed when

designing with the SS7529:

1. Keep the bypass capacitors of 5VCC and 12VCC very

close to IC.

Keep output voltage feed back network, FB pin and

FB2

components

(small

signal

components) very close to IC.

Signal ground plane of FB and FB2 pin (small signal

components) should be connected to the power

ground plane with a via or only one point to

minimizes the effect of power ground currents.

Switching node such as UGATE and LGATE should

be kept as small as possible and routed away from

FB, FB2, and other linear circuit.

The PCB traces carrying discontinuous currents and

any high current path should be made as short and

wide as possible.

If possible, a multi-layer PCB is recommended.

Please refer to the EV kit of SS7529 for a PCB layout

example.

Typical Application Circuit

FB2

DRIVES2

COMP

LGAT

UGAT

SS7529

12V

2.5Vout

1.6Vout

+3.3Vin

12V

3055

4.64k

2.15k

6.8k

10.7k

0 ohm

470p

2.2n

47n

2uH

1.2n

470uF

C10

330uF

C15

C11

330uF

C12

330uF

C13

470uF

C16

1uF

+3.3V

GND

SW1

SW DPST

GND

C14

470uF

CON1

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