The MIC2172/3172 is a complete 100kHz SMPS current-mode controller with an internal 65V 1.25A power switch. It operates from 3V to 40V input voltage range and features low external parts count, thermal shutdown, and can operate in most switching topologies. It is suitable for applications such as laptop/palmtop computers, toys, hand-held instruments, and off-line converters.
The MIC2172 and MIC3172 are complete 100kHz SMPS current-mode controllers featuring internal 65V, 1.25A power switches. The MIC2172 supports external frequency synchronization or adjustment, while the MIC3172 includes an enable/shutdown control input for on/off regulation.
Designed primarily for voltage step-up applications, these devices utilize a floating switch architecture that also makes them practical for step-down, inverting, and Cuk configurations. Operating from 3V to 40V with low quiescent current (7mA), they are suitable for battery-operated supplies and various industrial applications including laptop computers and off-line converters.
| Switch Current Rating | 1.25A |
|---|---|
| Switch Voltage Rating | 65V |
| Operating Input Voltage Range | 3V to 40V |
| Quiescent Current (Operating) | 7mA |
| Shutdown Quiescent Current (MIC3172) | <1pA |
| Oscillator Frequency | 83 to 115 kHz |
| Maximum Duty Cycle | 95% |
The MIC2172/3172 operate with an input voltage from 3V to 40V.
The device draws only 7mA of quiescent current during normal operation.
When disabled, the MIC3172 draws leakage current that is typically less than 1pA.