RT8167B datasheet(25/38 Pages) RICHTEK

25 / 38 page

RT8167B

DS8167B-00

October 2011

www.richtek.com

Application Information

The RT8167B is a VR12/IMVP7 compliant, dual single-

phase synchronous Buck PWM controller for the CPU

CORE VR and GFX VR. The gate drivers are embedded

to facilitate PCB design and reduce the total BOM cost. A

serial VID (SVID) interface is built-in in the RT8167B to

communicate with Intel VR12/IMVP7 compliant CPU.

The RT8167B adopts G-NAVPTM (Green Native AVP),

which is Richtek's proprietary topology derived from finite

DC gain compensator, making it an easy setting PWM

controller to meet AVP requirements. The load line can

be easily programmed by setting the DC gain of the error

amplifier. The RT8167B has fast transient response due

to the G-NAVPTM commanding variable switching

frequency.

G-NAVPTM topology also represents a high efficiency

system with green power concept. With G-NAVPTM

topology, the RT8167B becomes a green power controller

with high efficiency under heavy load, light load, and very

light load conditions. The RT8167B supports mode

transition function between CCM and DEM. These different

operating states allow the overall power system to have

low power loss. By utilizing the G-NAVPTM topology, the

operating frequency of RT8167B varies with output voltage,

load and VIN to further enhance the efficiency even in CCM.

The built-in high accuracy DAC converts the SVID code

ranging from 0.25V to 1.52V with 5mV per step. The

differential remote output voltage sense and high accuracy

DAC allow the system to have high output voltage accuracy.

The RT8167B supports VR12/IMVP7 compatible power

management states and VID on-the-fly function. The power

management states include DEM in PS2/PS3 and Forced-

CCM in PS1/PS0. The VID on-the-fly function has three

different slew rates : Fast, Slow and Decay. The RT8167B

integrates a high accuracy ADC for platform setting

functions, such as no-load offset and over current level.

The controller supports both DCR and sense-resistor

current sensing. The RT8167B provides VR ready output

signals of both CORE VR and GFX VR. It also features

complete fault protection functions including over voltage,

under voltage, negative voltage, over current and under

voltage lockout. The RT8167B is available in a WQFN-

48L 6x6 small foot print package.

Design Tool

To help users reduce efforts and errors caused by manual

calculations, a user-friendly design tool is now available

on request. This design tool calculates all necessary

design parameters by entering user's requirements.

Please contact Richtek's representatives for details.

Serial VID (SVID) Interface

SVID is a three-wire serial synchronous interface defined

by Intel. The three wire bus includes VDIO, VCLK and

ALERT signals. The master (Intel's VR12/IMVP7 CPU)

initiates and terminates SVID transactions and drives the

VDIO, VCLK, and ALERT during a transaction. The slave

(RT8167B) receives the SVID transactions and acts

accordingly.

RT8167B Datasheet(PDF) 25 Page - Richtek Technology Corporation

RT8167B Datasheet(HTML) 25 Page - Richtek Technology Corporation

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