• RT8880CGQ


Dual-Output PWM Controller with 3 Integrated Drivers for
AMD SVI2 Mobile CPU Power Supply

General Description

The RT8880C is a 3 + 2 phases PWM controller, and is
compliant with AMD SVI2 Voltage Regulator Specification
to support both CPU core (VDD) and Northbridge portion
of the CPU (VDDNB). The RT8880C features CCRCOT
(Constant Current Ripple Constant On-Time) with G-NAVP
(Green-Native AVP), which is Richtek's proprietary
topology. The G-NAVP makes it an easy setting controller
to meet all AMD AVP (Adaptive Voltage Positioning) VDD/
VDDNB requirements. The droop is easily programmed
by setting the DC gain of the error amplifier. With proper
compensation, the load transient response can achieve
optimized AVP performance. The controller also uses the
interface to issue VOTF Complete and to send digitally
encoded voltage and current values for the VDD and
VDDNB domains. It can operate in single phase and diode
emulation mode and reach up to 90% efficiency in different
modes according to different loading conditions. The
RT8880C provides special purpose offset capabilities by
pin setting. The RT8880C also provides power good
indication, over-current indication (OCP_L) and dual OCP
mechanism for AMD SVI2 CPU core and NB. It also
features complete fault protection functions including overvoltage, under-voltage and negative-voltage protections.