The SQ40222 is a high-frequency synchronous step-down DC-DC regulator capable of delivering 20A continuous current to the load, over the input range from 2.9V to 5.5V. The output voltage is adjustable from 0.34V to 1.272V. 

It uses a proprietary ripple-based constant on-time architecture with phase locked loop. The SQ40222 can achieve very high loop bandwidth to support fast load transient response within ~500ns. Multi-phase operation allows multiple SQ40222 regulators to run out-of-phase, which increases maximum load current to 40A. 

The operating frequency is selectable through I2C between 1.7MHz, 2.5MHz and 5MHz. The high switching frequency provides very compact solution size with small inductor and capacitors. The internal voltage reference provides    ±1% accuracy over junction temperature from -40℃ to 125℃. The differential sense pins allow output feedback remote sensing.

The SQ40222 supports cycle-by-cycle current limit, input undervoltage lockout, output undervoltage protection and thermal shutdown, providing safe operation under all operating conditions.

The device is available in a QFN3×4-16 package.