MP2372 – 3A, 28V, 925KHZ STEP-DOWN CONVERTER

MP2372 Rev. 0.92

www.MonolithicPower.com

11

12/22/2009

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2009 MPS. All Rights Reserved.

External Bootstrap Diode

Enough voltage of the bootstrap capacitor can

enhance the efficiency of the regulator and

increase the output capacity. The MP2372 can’t

output 3.3V/3A when the input voltage is only

about 5V. An External charge circuit shown in

Figure 4 can be a solution, and the applicable

conditions of the circuit are:

IN

V

V

>60%

The external bootstrap diode circuit can’t be

Figure 4—External Bootstrap Diode Circuit

D1 integrates two diodes in SOT-523 package

such as BAV199T which will not increase the

PCB size and the cost. The additional capacitor

C1 can be only 10nF.