MIC2202 Datasheet, PDF (9/18 Pages) Micrel Semiconductor – HIGH EFFICIENCY 2MHZ SYNCHRONOUS BUCK CONVERTER 1UP STABLE PWM REGULATOR

MIC2202
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 har-
monics. 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.
Micrel
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 funda-
mental frequency, resulting in matched harmonic frequen-
cies, simplifying designing for sensitive communication equip-
ment.
10kΩ
MIC2202
“Master”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
MIC2202
“Slave”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
Figure 4. Master-Slave Operation
May 2004
TIME (400ns/div.)
Figure 5. Master-Slave Synchronization Waveforms
9
M9999-052104