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Richtek - Dual-Output PWM Controller

Numéro de référence RT8877C
Description Dual-Output PWM Controller
Fabricant Richtek 
Logo Richtek 





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RT8877C fiche technique
®
RT8877C
Dual-Output PWM Controller for AMD SVI2 CPU Power
Supply
General Description
The RT8877C is a 4 + 2 phases PWM controller. Moreover,
it is compliant with AMD SVI2 Voltage Regulator
Specification to support both CPU core (VDD) and
Northbridge portion of the CPU (VDDNB). The RT8877C
features CCRCOT (Constant Current Ripple Constant On-
Time) with G-NAVP (Green-Native AVP), which is a
Richtek's proprietary topology. G-NAVP makes it an easy
setting controller to meet all AMD AVP (Active 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 RT8877C provides special purpose offset
capabilities by pin setting. The RT8877C 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 over voltage, under voltage and negative voltage.
Features
z 4/3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
z G-NAVPTM Topology
z Support Dynamic Load Line and Zero Load Line
z Diode Emulation Mode at Light Load Condition
z SVI2 Interface to Comply AMD Power Management
Protocol
z Build-in ADC for VOUT and IOUT Reporting
z Immediate OV, UV and NV Protections and UVLO
z Programmable Dual OCP Mechanism
z 0.5% DAC Accuracy
z Fast Transient Response
z Power Good Indicator
z Over Current Indicator
z 52-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z AMD SVI2 CPU
z Desktop Computer
Simplified Application Circuit
To CPU
RT8877C
OCP_L
PWM1
SVC
PWM2
PWM3
SVD
PWM4
PWMA1
SVT PWMA2
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
VVDD
VVDDNB
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8877C-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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