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Rev.1.5 Nov.06, 2019

AX5510

Frequency Select Pin (FREQ)

The frequency select pin FREQ allows to set the switching frequency of the device to

680 KHz (FREQ = low) or 1.2 MHz (FREQ = high). Higher switching frequency improves

load transient response but reduces slightly the efficiency. The other benefits of higher

switching frequency are a lower output ripple voltage. Usually, it is recommended to use 1.2

MHz switching frequency unless light load efficiency is a major concern.

Under Voltage Lockout (UVLO)

To avoid mis-operation of the device at low input voltages an under voltage lockout is

included that disables the device, if the input voltage falls below (2.35V-150mV).

Input Capacitor Selection

For better input bypassing, low-ESR ceramic capacitors are recommended for

performance. Two parallel 10uF (or one 22uF) 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 output capacitor like ceramic capacitor is

recommended. Three parallel 10uF ceramic capacitors work for most of the applications.

Higher capacitor values can be used to improve the load transient response and reduce

output ripple.