RT6338/RT6310/RT6321 23 V 8 A/10 A/12 A Series Buck Converters

Richtek RT6338, RT6310, and RT6321 family are high-efficiency synchronous step-down DC/DC converters with pseudo constant switching frequency 500 kHz that deliver up to 8 A, 10 A, and 12 A output current. They offer both programmed output voltage between 0.6 V to 5.5 V and 3.3 V/5.1 V fixed output voltage options.

The RT6338, RT6310, and RT6321 family adopts advanced constant on-time (ACOT®) control architecture that provides ultra-fast transient response and further reduces the external component count. In steady states, the ACOT operates at nearly constant switching frequency over line, load, and output voltage ranges, making EMI filter design easier.

By setting the voltage of the EN/MODE pin, this family operates either in diode emulation mode (DEM) or ultrasonic mode (USM) at light load. The USM maintains operation frequency above 25 kHz, which eliminates the acoustic noise. In the DEM, it provides the best light-load efficiency and improves the acoustic noise with spread spectrum function.

This family also provides a PGOOD indicator for easy system sequence control. Full protection features are also integrated into the device, including the cycle-by-cycle current limit, OVP, UVP, input UVLO, and OTP.