RT3669EA
Single Channel PWM Controller with 1 Integrated Driver and 1
LDO Regulator for AMD SVI2 GFX and FCH Power Supply
General Description
The RT3669EA is a single channel PWM controller with
1 integrated driver and 1 LDO regulator, it is compliant
with AMD SVI2 Voltage Regulator Specification to
support FP4 GFX power (VDDCR_GFX) and FCH
power (VDDCR_FCH_S5). The RT3669EA 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) GFX 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 GFX domains. The RT3669EA
can operate in diode emulation mode to enhance the
light load efficiency. And it provides the current gain
adjustment capability by pin setting. The RT3669EA
also provides power good indication, thermal indication
(VRHOT_L), and it features complete fault protection
functions including over current, over voltage and under
voltage.
Features
1-Phase (VDDCR_GFX) PWM Controller
1 Embedded MOSFET Driver
1 LDO Regulator for FCH
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 FP4 GFX and FCH Power
Simplified Application Circuit
RT3669EA
VRHOT_L
SVC
To GFX
SVD
SVT
MUX_CTRL
V
VDDNB
VSEN_NB_IN
S5_OUT
V
VDDCR_FCH_S5
LDO_OUT
LDO_IN
V
IN_LDO
V
OUT_LDO
PHASE
MOSFET
V
VDDCR_GFX
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS3669EA-06
August 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
