MIC2214-2.7SLASH3.0BML datasheet(10/11 Pages) MICREL

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MIC2214

Micrel

MIC2214

August 2004

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 MIC2214 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 an

X7R ceramic capacitor to ensure the same minimum capaci-

tance over the equivalent operating temperature range.

Adjustable Regulator Design

VOUT1

ADJ1

ADJ2

VOUT2

GND

MIC2214 Adjustable Regulator Design

The MIC2214 allows the programming of the output voltages

1 and 2 anywhere between 1.25V and 5.5V, the maximum

operating rating of the part. Two resistors are required for

each output. Appropriate resistor values are required to

prevent the low quiescent current performance being com-

promised. Resistor values recommended are between 100k

Ω

and 500k

Ω.

The resistor values are calculated by:

1 250

=−









OUT

where V

OUT is the desired output voltage. Calculate sepa-

rately for each output.

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