RT8208B

RT8208A/B Programmable Output V oltage Single Synchronous Buck Controller General D escription The RT8208A/B is a con stant-on-time PWM controller which provide s f our re sistor programmable DC output voltages by controlling the G0 and G1 digital input. The output voltage is programmable from 0.75V to 3.3V. The RT8208A/B offers the lowest total solution cost in systems where need output voltage slewing. The RT8208A/B provides an automatic ma sking power good output during output voltage transition. The constant-on-time PWM control sche me handles wide input/output ratios with ea se and provides 100ns “ instanton” respon se to loa d tra nsient while maintaining a relatively constant frequency. It provides the high ef ficiency, excellent tra nsient respon se, a nd DC output a ccuracy needed for stepping down high voltage batteries to generate low voltage CPU core, gra phics, I/O and chipset RAM supplies in notebook computers. The RT8208A/B achieves high efficiency at a reduced cost by eliminating the current sense resistor in traditional current mode PWMs. Efficiency is further enha nced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this device to directly step down from high voltage batteries for the highest possible efficiency. Additional features include soft-start, under voltage prote ction, programmable over current protection and non-overlapping gate drive. The RT8208A/ B is available in a WQFN-16L 3x3 package. Features z z...