Boost converter with a 1.4A internal switch in a 16-QSOP
The Maxim Integrated MAX618EEE+T is a step-up (boost) switching regulator with an adjustable output voltage, built around a 1.4A internal switch. It operates from a 3V to 28V input range and switches at 250kHz, making it suitable for generating higher-voltage rails from a lower-voltage bus in industrial control, telecom, and battery-powered equipment.
The 1.4A switch current rating is the peak current the internal MOSFET can handle. For a typical boost conversion from 5V to 12V, that translates to roughly 800 mA output at the higher voltage, depending on duty cycle and efficiency. The 250kHz switching frequency is a middle ground — fast enough to keep inductor and capacitor sizes reasonable, but not so high that switching losses dominate or layout becomes critical. No synchronous rectifier is used, so expect a Schottky diode in the output path.