Confidential

Datasheet Version 1.0

July

2015. Revision 1.0

MagnaChip Semiconductor Ltd.

7

Choose an output capacitor to satisfy the output ripple and load transient requirements of the design. A 4.7uF

–

22uF ceramic capacitor is suitable for most applications

Loop Compensation

The output of the transconductance error amplifier(COMP) is used to compensate the regulation control system.

L1=4.7uH, while the recommended value for compensation is as follows : R3 = 100kohm, C1=330pF

Selecting the Inductor

The inductor is required to force the higher output voltage while being driven by the input voltage. A larger value

Inductor results in less ripple current that results in lower peak inductor current, reducing stress on the internal N-

channel switch. However, the larger series resistance, and/or lower saturation current. A 4.7uF Inductor is

recommended for most 500kHz applications. As a general rule, the peak-to-peak ripple current range is 20% to

40% of the maximum input current. Make sure that the peak inductor current is below 75% of the current limit at

The operating duty cycle to prevent loss of regulation due to the current limit. Also make sure that the inductor

does not saturate under the worst-case load transient and startup conditions. Calculate the required inductance

value by the equation

Selecting the Diode

The output rectifier diode supplies current to the inductor when the internal MOSFET is off. Schottky diodes are

chosen for their low forward voltage drop and fast switching speed. The diode should be rated for a reverse

voltage equal to or greater than the output voltage used. The average current rating must exceed the average

output current and the peak current rating must be greater than the peak inductor current.