LP6218S datasheet(5/6 Pages) POWER

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Preliminary Datasheet

LP6218S

LP6218S –01 Version 1.1Datasheet

Jul.-2013

www.lowpowersemi.com - -

Page 5 of 6

Diode Selection

To achieve high efficiency, Schottky diode is good

choice for low forward drop voltage and fast

switching time. The output diode rating should be

able to handle the maximum output voltage, average

power dissipation and the pulsating diode peak

current.

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 Guideline

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.

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