The RT6218A/B is a simple, easy-to-use, 2A synchronous step-down DC-DC converter with an input supply voltage range of 4.5V to 18V. The device integrates low RDS(ON) power MOSFETs to achieve high efficiency in a SOT23 package and build-in accurate reference voltage (0.765V by product options).
The RT6218A/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 RT6218A operates in automatic PSM that maintains high efficiency during light load operation. RT6218B operates in Forced PWM that helps meet tight voltage regulation accuracy requirements.
The RT6218A/B senses both FETs current for a robust over-current protection. The device features cycle-by-cycle current limit protection and prevent the device from the catastrophic damage in output short circuit, over current or inductor saturation. The RT6218A/B series offers programmable start-up by connecting a capacitor at external SS pin. 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 RT6218A/B are offered in TSOT-23-8(FC) package.
Applications
- Set-Top Boxes
- LCD TVs
- Home Networking Devices
- Surveillance
- General Purpose