LP6222SPF datasheet(7/9 Pages) POWER

7 / 9 page

LP6222-01

May.-2018

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 7 of 9

Preliminary Datasheet

LP6222

Inductor Selection

For a better efficiency in high switching frequency

converter, the inductor selection has to use a proper

core material such as ferrite core to reduce the core

loss and choose low ESR wire to reduce copper loss.

The most important point is to prevent the core

saturated when handling the maximum peak current.

Using a shielded inductor can minimize radiated

noise in sensitive applications. The maximum peak

inductor current is the maximum input current plus

the half of inductor ripple current. The calculated

peak current has to be smaller than the current

limitation in the electrical characteristics. A typical

setting of the inductor ripple current is 20% to 40% of

the maximum input current. If the selection is 40%,

the maximum peak inductor current is

The minimum inductance value is derived from the

following equation:

Depending on the application, the recommended

inductor value is between 2.2uH to 10uH.

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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