MIC3172YM

The MIC3172YM is a Current-mode Controller with internal 65V/1.25A power switches. It 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 MIC3172 makes it practical for step-down, inverting and Cuk configurations as well as isolated topologies. Operating from 3 to 40V, the MIC3172 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. It is externally shutdown by applying a TTL low signal to EN (enable). When disabled, the MIC3172 draws only leakage current (typically less than 1µA). EN must be high for normal operation. For applications not requiring control, EN must be tied to VIN or TTL high.

• Current-mode operation
• Internal cycle-by-cycle current limit
• Thermal shutdown
• Low external parts count
• Operates in most switching topologies
• TTL shutdown compatibility
• Fits most LT1172 sockets
• <1µA Quiescent current in shutdown mode