®
RT3605BE
Triple Channel PWM Controller for IMVP8 Mobile CPU Core
Power Supply
General Description
The RT3605BE is an IMVP8 compliant CPU power
controller which includes three voltage rails : a 3/2/1 phase
synchronous Buck controller, the MAIN VR, a 2/1 phase
synchronous Buck controller, the Auxiliary VR, and a
single phase synchronous Buck controller, the VCCSA
VR. The RT3605BE adopts G-NAVP
TM
(Green Native AVP)
which is Richtek's proprietary topology derived from finite
DC gain of EA amplifier with current mode control, making
it easy to set the droop to meet all Intel CPU requirements
of AVP (Adaptive Voltage Positioning). Based on the G-
NAVP
TM
topology, the RT3605BE also features a quick
response mechanism for optimized AVP performance
during load transient. The RT3605BE supports mode
transition function with various operating states. A serial
VID (SVID) interface is built in to communicate with Intel
IMVP8 compliant CPU. The RT3605BE supports VID on-
the-fly function with three different slew rates : Fast, Slow,
and Decay. By utilizing the G-NAVP
TM
topology, the
operating frequency of the RT3605BE varies with VID,
load, and input voltage to further enhance the efficiency
even in CCM. Moreover, the G-NAVP
TM
with CCRCOT
(Constant Current Ripple COT) technology provides
superior output voltage ripple over the entire input/output
range. The built-in high accuracy DAC converts the SVID
code ranging from 0.25V to 1.52V with 5mV per step. The
RT3605BE integrates a high accuracy ADC for platform
setting functions, such as quick response trigger level.
The RT3605BE provides VR ready output signals. It also
features complete fault protection functions including over-
voltage (OV), over-current (OC) and under-voltage lockout
(UVLO). The RT3605BE is available in the WQFN-52L
6x6 small foot print package.
Features
Intel IMVP8 Serial VID Interface Compatible Power
Management States
3/2/1 Phase (MAIN VR) + 2/1 Phase (Auxiliary VR) +
Single Phase (VCCSA VR) PWM Controller
Embedded Audio Noise Suppress Function
Support Multi-Source Dr.MOS and MOSFET
G-NAVP
TM
(Green Native Adaptive Voltage
Positioning) Topology
0.5% DAC Accuracy
Differential Remote Voltage Sensing
Built-in ADC for Platform Programming
Accurate Current Balance
System Thermal Compensated AVP
Diode Emulation Mode at Light Load Condition for
Multiple or Single Phase Operation
Fast Transient Response
VR Ready Indicator
Thermal Throttling
Current Monitor Output
OVP, OCP, UVLO
Slew Rate Setting
DVID Enhancement
Applications
IMVP8 Intel Core Supply
Notebook/ Desktop Computer/ Servers Multi-Phase CPU
Core Supply
AVP Step-Down Converter
Simplified Application Circuit
To PCH
RT3605BE
VR_READY
PWM_SA
Driver
MOSFET
V
SA
V
AXG
VR_HOT
To CPU
VCLK
VDIO
ALERT
PWM1_MAIN
PWM2_MAIN
PWM3_MAIN
Driver
Driver
Driver
MOSFET
MOSFET
MOSFET
PWM1_AUXI
PWM2_AUXI
Driver
Driver
MOSFET
MOSFET
V
CORE
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS3605BE-00
December 2019
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
