The RT8241 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 computers.
The RT8241 supports on chip voltage programming function
between 0.675V and 0.9V by controlling GX digital inputs.
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 RT8241 achieves high efficiency at a reduced cost
by eliminating the current-sense resistor found in
traditional current-mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs and enter diode emulation mode at
light load condition. The buck conversion allows this device
to directly step down high voltage batteries at the highest
possible efficiency. The RT8241 is intended for CPU core.
chipset; DRAM; or other low voltage supplies as low as
The RT8241 is available in a WQFN-12L 2x2 package.