RichTek Technology Corporation Special Purpose Regulators RT8243BZQW

The RT8243BZQW is a dual step-down switch mode power supply (SMPS) controller designed for notebook computers and battery-powered devices. It operates with an input voltage range of 5.5V to 25V and provides adjustable output voltages from 2V to 5.5V, along with fixed 5V and 3.3V linear regulators. The controller features a constant on-time PWM control scheme that eliminates the need for current sense resistors, ensuring fast load transient response and maintaining a nearly constant switching frequency. Key features include internal current limit, soft-start, soft discharge output, and built-in over-voltage, under-voltage, and over-current protection. The device supports selectable operation modes and includes a power good indicator. It operates over an extended temperature range of -40¬8C to 85¬8C and is housed in a compact WQFN-20L 3x3 package. The RT8243BZQW is RoHS compliant and halogen-free, making it suitable for environmentally conscious designs.