The RT8809A/B is a dual-phase synchronous buck PWM
controller with integrated drivers which are optimized for
high performance graphic microprocessor and computer
applications. The IC integrates a G-NAVPTM PWM
controller, two 12V MOSFET drivers with internal bootstrap
diodes, as well as output current monitoring and protection
functions into the WQFN-24L 4x4 package. The
RT8809A/B adopts DCR and RDS(ON) current sensing. Load
line voltage positioning (droop) and over current protection
are accomplished through continuous inductor DCR current
sensing, while RDS(ON) current sensing is used for accurate
channel current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
The RT8809A/B also features a one-bit VID control
operation in which the feedback voltage is regulated and
tracks external input reference voltage. Other features
include, adjustable operating frequency, external
compensation, and enable/shutdown functions.
Features RT8809AGQW RT8809BGQW RT8809AZQW RT8809BZQW资料下载
