General Description
The RT8848C is a 8/7/6/5/4/3/2/1 multi-phase
synchronous Buck controller which is optimized for
high-performance graphic microprocessor and
supports nVidia OVR4i+ spec with PWM-VID interface.
The RT8848C adopts AC G-NAVPTM (Green Native
AVP), which is Richtek's proprietary topology derived
from finite DC gain of internal GM amplifier with current
mode control. By utilizing the AC G-NAVPTM topology,
the operating frequency of the RT8848C varies with
VID, load and input voltage to further enhance the
efficiency even in CCM. Besides, for current sensing
application, the RT8848C can support either a
traditional DCR network current sensing from inductor
or a smart power stage (SPS) which can directly
provide a current monitor signal (IMON).
The RT8848C features external reference input and
PWM-VID dynamic output voltage control, in which the
output voltage is regulated and tracks external input
reference voltage. The RT8848C can set internal
RAMP amplitude through PINSETx pin and this can
optimize stability and load transient performance. The
RT8848C also provides complete fault protection
functions including overvoltage protection (OVP),
undervoltage protection (UVP), channel overcurrent
limit (CH_OC), sum output current protection (SOC)
and over-temperature protection (OTP). The
recommended junction temperature is −40C to 125C.

Features
⚫ Multi-Phase PWM Controller
⚫ PWM-VID Dynamic Voltage Control
⚫ Support 1.8V PWM-VID Interface
⚫ Power State Indicator
 LPC (Low Phase Count), PSI = Low
 APS (Auto Phase Shedding), PSI = Mid
 HPC (High Phase Count), PSI = High
⚫ External Reference Input Control
⚫ 8/7/6/5/4/3/2/1 Phase Hardware Setting
⚫ Adjustable Soft-Start Time
⚫ Adjustable Switching Frequency
⚫ Adjustable Phase Current Balance
⚫ Support Standby Mode
⚫ UVP/OVP/OTP/SOC/CH_OC/TSEN Protection
⚫ Adjustable Protection Thresholds
⚫ Power Good Indicator
⚫ ADC Reporting for IMON, TSEN and VSEN
⚫ Support I2C Interface for Programming

Applications
⚫ GPU Core Power for OVR4i+ Spec