23V, 6A, 500kHz ACOT^® Synchronous Step-Down Converter

The RT6276A/B is a simple, easy-to-use, 6A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 23V. The device build-in an accurate 0.6V reference voltage and integrates low R_DS(ON) power MOSFETs to achieve high efficiency in a UQFN-12HL 3x3 package. The RT6276A/B adopts Advanced Constant On-Time (ACOT^®) 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 RT6276A operates in automatic PSM that maintains high efficiency during light load operation. The RT6276B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements. The RT6276A/B 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. A built-in soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, over-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. The RT6276A/B is offered in a UQFN-12HL 3x3(FC) package.