Preliminary Datasheet

LP6252

www.lowpowersemi.com

Page 6 of 8

The minimum inductance value is derived from the

following equation :

Depending on the application, the recommended

inductor value is between 2.2μH to 4.7μH.

Input Capacitor Selection

For better input bypassing, low-ESR ceramic

capacitors are recommended for performance. A 10μF

input capacitor is sufficient for most applications. For a

lower output power requirement application, this value

can be decreased.

Output Capacitor Selection

For lower output voltage ripple, low-ESR ceramic

capacitors are recommended. The tantalum capacitors

can be used as well, but the ESR is bigger than

ceramic capacitor. The output voltage ripple consists

of two components: one is the pulsating output ripple

current flows through the ESR, and the other is the

capacitive ripple caused by charging and discharging.

Layout Guide

For high frequency switching power supplies, the PCB

layout is important step in system application design.

In order to let IC achieve good regulation, high

efficiency and stability, it is strongly recommended the

power components should be placed as close as

possible. The set races should be wide and short. The

feedback pin and then works of feedback and

compensation should keep away from the power loops,

and be shielded with a ground trace or plane to

prevent noise coupling.