MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER

MP2307 Rev. 1.9

www.MonolithicPower.com

10

5/28/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2008 MPS. All Rights Reserved.

5) Connect IN, SW, and especially GND

respectively to a large copper area to cool

the chip to improve thermal performance

and long-term reliability.

TOP Layer

Bottom Layer

Figure 2―PCB Layout (Double Layer)

External Bootstrap Diode

An external bootstrap diode may enhance the

efficiency of the regulator, the applicable

conditions of external BS diode are:

VOUT is 5V or 3.3V; and

Duty cycle is high: D=

IN

OUT

V

V

>65%

In these cases, an external BS diode is

recommended from the output of the voltage

regulator to BS pin, as shown in Figure3

MP2307

SW

BS

C

L

BST

C

5V or 3.3V

OUT

External BST Diode

IN4148

Figure 3—Add Optional External Bootstrap

Diode to Enhance Efficiency

The recommended external BS diode is IN4148,

and the BS cap is 0.1~1µF.