MIC2202BML datasheet(9/19 Pages) MICREL

9 / 19 page

Micrel, Inc.

MIC2202

March 2007

M9999-031907

PWM control provides fixed frequency operation. By

maintaining a constant switching frequency, predictable

fundamental and harmonic frequencies are achieved.

Other methods of regulation, such as burst and skip

modes, have frequency spectrums that change with load

that can interfere with sensitive communication equip-

ment.

Synchronization

Sync_In allows the user to change the frequency from

2MHz up to 2.5MHz or down to 1.6MHz. This allows the

ability to control the fundamental frequency and all the

resultant harmonics. Maintaining a predictable frequency

creates the ability to either shift the harmonics away

from sensitive carrier and IF frequency bands or to

accurately filter out specific harmonic frequencies.

The Sync_Out function pin allows for the ability to be

able to sync up multiple MIC2202s in a “daisy-chain”,

connecting Sync_Out to Sync_In of the other MIC2202.

Synchronizing multiple MIC2202s benefits much in the

same way as syncing up one MIC2202. All regulators

will run at the same fundamental frequency, resulting in

matched harmonic frequencies, simplifying designing for

sensitive communication equipment.

SYNC_IN

VIN

MIC2202

“Master”

SYNC_OUT

BIAS

SYNC_IN

VIN

MIC2202

“Slave”

SYNC_OUT

BIAS

Figure 4. Master-Slave Operation

Figure 5. Master-Slave Synchronization Waveforms

MIC2202BML Datasheet(PDF) 9 Page - Micrel Semiconductor