MAX8643 查看數據表（PDF） - Maxim Integrated

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MAX8643

3A, 2MHz Step-Down Regulator with Integrated Switches

Maxim Integrated 

3A, 2MHz Step-Down Regulator

with Integrated Switches

PCB Layout Considerations and

Thermal Performance

Careful PCB layout is critical to achieve clean and stable

operation. It is highly recommended to duplicate the

MAX8643 EV kit layout for optimum performance. If devia-

tion is necessary, follow these guidelines for good PCB

layout:

1) Connect input and output capacitors to the power

ground plane; connect all other capacitors to the sig-

nal ground plane.

2) Place capacitors on VDD, VIN, and SS as close as

possible to the IC and its corresponding pin using

direct traces. Keep power ground plane (connected

to PGND) and signal ground plane (connected to

GND) separate.

3) Keep the high-current paths as short and wide as

possible. Keep the path of switching current short

and minimize the loop area formed by LX, the out-

put capacitors, and the input capacitors.

4) Connect IN, LX, and PGND separately to a large

copper area to help cool the IC to further improve

efficiency and long-term reliability.

5) Ensure all feedback connections are short and

direct. Place the feedback resistors and compensa-

tion components as close to the IC as possible.

6) Route high-speed switching nodes, such as LX,

away from sensitive analog areas (FB, COMP).

TOP VIEW

Pin Configuration

18 17 16 15 14 13

PGND 19

12 PWRGD

PGND 20

11 FREQ

IN 21

IN 22

MAX8643

10 OUT

9 FB

IN 23

EN 24

+

12

3456

8 COMP

7 GND

THIN QFN

PROCESS: BiCMOS

Chip Information

14 ______________________________________________________________________________________

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