MIC2172/3172
100kHz 1.25A Switching Regulators General Description Features The MIC2172 and MIC3172 are complete 100kHz SMPS
current-mode controllers with internal 65V 1.25A power
switches. The MIC2172 features external frequency
synchronization or frequency adjustment, while the
MIC3172 features an enable/shutdown control input.
Although primarily intended for voltage step-up
applications, the floating switch architecture of the
MIC2172/3172 makes it practical for step-down, inverting,
and Cuk configurations as well as isolated topologies.
Operating from 3V to 40V, the MIC2172/3172 draws only
7mA of quiescent current making it attractive for battery
operated supplies.
The MIC3172 is for applications that require on/off control
of the regulator. The MIC3172 is externally shutdown by
applying a TTL low signal to EN (enable). When disabled,
the MIC3172 draws only leakage current (typically less
than 1ВµA). EN must be high for normal operation. For
applications not requiring control, EN must be tied to VIN or
TTL high.
The MIC2172 is for applications requiring two or more
SMPS regulators that operate from the same input supply.
The MIC2172 features a SYNC input which allows locking …