24V, 3A, 500kHz, ACOT^TM Step-Down Converter in 8 Pin TSOT-23

The RT6217E is a simple, easy-to-use, 3A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 24V. The device build-in an accurate 0.791V reference voltage and integrates low R_DS(ON) power MOSFETs to achieve high efficiency in a TSOT-23-8 (FC) package. The RT6217E adopts Advanced Constant On-Time (ACOT^TM) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT6217E has MODE Selection function. To connect MODE pin to ground to force the RT6217E into Pulse Skipping Mode for light load efficiency improvement. Pulling the MODE pin high (i.e. > 2V) will force the RT6217E into CCM that helps meet tight voltage regulation accuracy requirements.

The RT6217E senses both FETs current for a robust over-current protection. It features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. An internally soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. The RT6217E is offered in a TSOT-23-8 (FC) package.