9.2.1.2.2.2 Output Capacitor

For the output capacitor, use of a small X5R or X7R ceramic capacitor placed as close as possible to the VOUT and GND pins of the IC is recommended. If, for any reason, the application requires the use of large capacitors which cannot be placed close to the IC, use a smaller ceramic capacitor in parallel to the large capacitor. The small capacitor should be placed as close as possible to the VOUT and GND pins of the IC.

The output capacitor should be at least 2.2 μF. There are no additional requirements regarding minimum ESR. There is also no theoretical upper limit for the output capacitance value. The device has been tested with capacitors up to 100 μF. In general, larger capacitors cause lower output voltage ripple as well as lower output voltage drop during load transients. To improve control performance, especially when using high output capacitance values, a feedforward capacitor in parallel to R1 is recommended. The value should be in the range of the value calculated in Equation 4:

Equation 4.