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