MP8352 – 3V to 6V INPUT, 6A, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER

MP8352 Rev. 1.0

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11

1/25/2010

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External Bootstrap Diode

An external bootstrap diode may enhance the

efficiency of the regulator, the applicable

conditions of external BST diode are:

Duty cycle is high: D=

IN

OUT

V

V

>65%

In these cases, an external BST diode is

in Fig.4

SW

BST

C

L

BST

C

2.5V

OUT

External BS

T Diode

MP8352

IN4148

Figure 4—Add Optional External Bootstrap

Diode to Enhance Efficiency

The recommended external BST diode is

IN4148, and the BST cap is 0.1~1µF, when the

BST diode is used.

Vcc Bias Supply Consideration

The MP8352 does not have the LDO inside. It

needs external bias power supply to make the

device work properly.