®
RT3667BL
Dual-Output PWM Controller with 2 Integrated Drivers for
AMD SVI2 CPU Power Supply
General Description
The RT3667BL is a 4 + 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 RT3667BL features CCRCOT
(Constant Current Ripple Constant On-Time) with the 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 (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
RT3667BL provides special purpose offset capabilities by
pin setting. The RT3667BL also provides power good
indication, over-current indication (OCP_L) and dual OCP
mechanism for AMD SVI2 CPU core and NB. It also
features fault protection functions, including over-voltage,
under-voltage and negative voltage protections.
Features
4/3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
2 Embedded MOSFET Drivers at the VDD Controller
G-NAVP
TM
Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply AMD Power Management
Protocol
Build-In ADC for V
OUT
and I
OUT
Reporting
Immediate OV, UV and NV Protections and UVLO
Programmable Dual OCP Mechanism
0.5% DAC Accuracy
Fast Transient Response
Power Good Indicator
Over-Current Indicator
52-Lead WQFN Package
Applications
AMD SVI2 CPU
Desktop Computer
Simplified Application Circuit
RT3667BL
OCP_L
PHASE1
PHASE2
SVC
To CPU
SVD
SVT
PWM3
PWM4
PWMA1
PWMA2
MOSFET
MOSFET
RT9624A
RT9624A
RT9624A
RT9624A
MOSFET
MOSFET
MOSFET
MOSFET
V
VDDNB
V
VDD
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS3667BL-00
September
2019
www.richtek.com
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
