RT3661AB
Dual-Output PWM Controller with 2 Integrated Drivers for
AMD SVI2 Mobile CPU Power Supply
General Description
The RT3661AB is a dual-output PWM controller with 2
integrated drivers, and it is compliant with AMD SVI2
Voltage Regulator Specification to support both CPU
core (VDD) and Northbridge portion of CPU (VDDNB).
The RT3661AB features CCRCOT (Constant Current
Ripple Constant On-Time) with G-NAVP (Green-Native
AVP), which is Richtek's proprietary topology. 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/VDDNB domains. The RT3661AB can operate in
diode emulation mode to enhance the light load
efficiency. And it provides the current gain adjustment
capability by pin setting. The RT3661AB provides
power good indication, thermal indication (VRHOT_L),
and it features complete fault protection functions
including over current, over voltage, under voltage.
Features
1-Phase (VDD) + 1/0-Phase (VDDNB) PWM
Controller
2 Embedded MOSFET Drivers
G-NAVP
TM
Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply with AMD Power
Management Protocol
Adjustable Current Gain Capability
DVID Enhancement
0.5% DAC Accuracy
Differential Remote Voltage Sensing
Build-in ADC for Pin Setting Programming,
Thermal Indication and V
OUT
, I
OUT
Reporting
Fast Transient Response
Power Good Indicator
Thermal Indicator (VRHOT_L)
OVP, UVP and UVLO
Over Current Protection
Applications
AMD SVI2 Mobile CPU
Laptop Computer
Simplified Application Circuit
RT3661AB
VRHOT_L
PHASE
SVC
To CPU
SVD
SVT
PHASE_NB
MOSFET
V
VDDNB
MOSFET
V
VDD
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS3661AB-05
May
2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
