MIC2213

Micrel

MIC2213

10

July 2003

Input Capacitor

Good bypassing is recommended from input to ground to

help improve AC performance. A 1

µF capacitor or greater

located close to the IC is recommended.

Bypass Capacitor

The internal reference voltage of the MIC2213 can be by-

passed with a capacitor to ground to reduce output noise and

increase power supply rejection (PSRR). A quick-start fea-

ture allows for quick turn-on of the output voltage regardless

of the size of the capacitor. The recommended nominal

bypass capacitor is 0.01

µF, but it can be increased without

limit.

Output Capacitor

Each regulator output requires a 1

µF ceramic output capaci-

tor for stability. The output capacitor value can be increased

to improve transient response, but performance has been

optimized for a 1

µF ceramic type output capacitor.

X7R/X5R dielectric-type ceramic capacitors are recom-

mended because of their temperature performance. X7R-

type capacitors change capacitance by 15% over their oper-

ating temperature range and are the most stable type of

ceramic capacitors. Z5U and Y5V dielectric capacitors change

value by as much as 50% and 60% respectively over their

operating temperature ranges. To use a ceramic chip capaci-

tor with Y5V dielectric, the value must be much higher than a

X7R ceramic capacitor to ensure the same minimum capaci-

tance over the equivalent operating temperature range.