MP3213 – 700KHZ/1.3MHZ BOOST CONVERTER WITH A 3.5A SWITCH

MP3213 Rev. 1.1

www.MonolithicPower.com

9

5/12/2006

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Layout Consideration

High frequency switching regulators require very

careful layout for stable operation and low noise.

All components must be placed as close to the IC

as possible. Keep the path between the SW pin,

output diode, output capacitor and GND pin

extremely short for minimal noise and ringing. The

input capacitor must be placed close to the IN pin

for best decoupling. All feedback components

must be kept close to the FB pin to prevent noise

injection on the FB pin trace. The ground return of

the input and output capacitors should be tied

close to the GND pin. See the MP3213 demo

board layout for reference.

TYPICAL APPLICATION CIRCUIT

5V

12V

MP3213

SW

IN

FB

COMP

SS

GND

EN

FSEL

5

2

1

4

8

3

7

6

OFF ON

D1

C4

10nF

C3

2.2nF

Figure 2—Typical Application Circuit