General Description
The RT3612EB is a 2/1 phase synchronous buck
controller designed to meet Intel IMVP9 compatible CPU
specification with a serial VID control interface. The
RT3612EB adopts G-NAVPTM (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 GNAVPTM topology, the RT3612EB features a new
generation of quick response mechanism (Adaptive Quick
Response, AQR) to optimize AVP performance during load
transient and reduce output capacitors. The RT3612EB
supports mode transition function with various operating
states. A serial VID (SVID) interface is built in the
RT3612EB to communicate with Intel IMVP9 compliant
CPU. The RT3612EB supports VID on-the-fly function with
three different slew rates: Fast, Slow and Decay. By
utilizing the G-NAVPTM topology, the operating frequency
of the RT3612EB varies with VID, load and input voltage
to further enhance the efficiency even in CCM. Moreover,
the G-NAVPTM 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 0V to 2.74V
with 10mV per step. The RT3612EB integrates a high
accuracy ADC for platform and function settings, such as
ICCMAX, switching frequency, over-current threshold and
AQR trigger level. The RT3612EB provides VR Ready and
thermal indicators. It also features complete fault
protection functions including over-voltage (OV), undervoltage (UV), over-current (OC) and under-voltage lockout
(UVLO).

Features
Intel IMVP9 Serial VID Interface Compatible Power
Management States
2/1 Phase PWM Controller and 2 Embedded
MOSFET Drivers
G-NAVPTM (Green Native Adaptive Voltage
Positioning) Topology
0.5% DAC Accuracy
Differential Remote Voltage Sensing
Built-in ADC for Platform Programming and
Reporting
Accurate Current Balance
System Thermal Compensated AVP
Diode Emulation Mode at Light Load Condition
Fast Transient Response-Adaptive Quick Response
(AQR)
VR Ready Indicator
Thermal Monitoring and Indicator
Current Monitoring
IMVP9 System Input Power Monitoring
OVP, OCP, UVLO, UVP
Switching Frequency Range Setting
Slew Rate Setting
DVID Enhancement
Acoustic Noise Suppression
Small 32-Lead WQFN Package

Applications
IMVP9 Intel Core Supply
Notebook Computer Multi-Phase CPU Core Supply
AVP Step-Down Converter