M2305SDS View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

M2305SDS

2A, 23V Synchronous Rectified Step-Down Converter

Unspecified 

MP2305S – 2A, 23V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER

less than half of the switching frequency, or the

following relationship is valid:

1

< fS

2π × C2 × RESR 2

If this is the case, then add the second

compensation capacitor (C6) to set the pole fP3 at

the location of the ESR zero. Determine the C6

value by the equation:

C6 = C2 × RESR

R3

External Bootstrap Diode

An external bootstrap diode may enhance the

efficiency of the regulator, and it will be a must if

the applicable condition is:

z VOUT=5V or 3.3V; and

z duty cycle is high: D= VOUT >65%

VIN

In these cases, an external BST diode is

recommended from the output of the voltage

regulator to BST pin, as shown in Figure 2

BST

MP2305S

SW

External BST Diode

IN4148

CBST

0.01

L

+

C OUT

5V or 3.3V

Figure 2—Add Optional External Bootstrap

Diode to Enhance Efficiency

The recommended external BST diode is IN4148,

and the BST cap is 0.01µF.

MP2305S Rev. 1.02

www.MonolithicPower.com

10

10/22/2013

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