RT8237L
Description
The RT8237L PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in notebook puters.
The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.
The RT8237L achieves high efficiency at reduced cost by eliminating the current sense resistor found in traditional current-mode PWM controllers. Its efficiency is further enhanced by the ability to drive large synchronous rectifier MOSFETs and to enter diode emulation mode at light load conditions. The buck conversion allows this device to directly step down high-voltage batteries at the highest possible efficiency. The preset frequency selections minimize the effort required for new designs. The RT8237L is intended for CPU...
