ACE726C

500KHz, 18V, 2A Synchronous Step-Down Converter

VER 1.1

9

Where L is the inductor value and RESR is the equivalent series resistance (ESR) of the output capacitor.

For ceramic capacitors, the capacitance dominates the impedance at the switching frequency and causes

most of the output voltage ripple. For simplification, estimate the output voltage ripple with:

For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For

simplification, the output ripple can be approximatedwith:

The characteristics of the output capacitor also affect the stability of the regulation system. The ACE726C

can be optimized for a wide range of capacitance and ESR values.