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What is RT8889D?

This electronic component, produced by the manufacturer "Richtek", performs the same function as "3-Phase PWM Controller".


RT8889D Datasheet PDF - Richtek

Part Number RT8889D
Description 3-Phase PWM Controller
Manufacturers Richtek 
Logo Richtek Logo 


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®
RT8889D
3-Phase PWM Controller with Triple Integrated Drivers for
VR12.5 CPU Core Power Supply
General Description
The RT8889D is a three phase CPU power controller with
triple integrated drivers for VR12.5 compliant. The
RT8889D 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 an
easy setting the droop to meet all Intel CPU requirements
of AVP (Adaptive Voltage Positioning). Based on the G-
NAVPTM topology, the RT8889D also features a quick
response mechanism for optimized AVP performance
during load transient. The RT8889D supports mode
transition function with various operating states. A Serial
VID (SVID) interface is built in the RT8889D to
communicate with Intel VR12.5 compliant CPU. The
RT8889D 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
RT8889D varies with VID, load current and input voltage
to further enhance the efficiency even in CCM. Besides
G-NAVPTM, the CCRCOT (Constant Current Ripple
Constant On Time) technology provides superior output
voltage ripple over the entire input/output range. The built-
in high accuracy DAC converts the SVID code ranging
from 0.5V to 3.04V with 10mV per step. The RT8889D
integrates a high accuracy ADC for platform setting
functions, such as no-load offset and over current
protection level. It also features complete fault protection
functions including Over Voltage (OV), Under Voltage (UV),
Negative Voltage (NV), Over Current (OC) and Under
Voltage Lockout (UVLO). The RT8889D is available in a
WQFN-40L 5x5 small foot print package.
Features
Intel VR12.5 Serial VID Interface Compatible Power
Management States
3/2/1 Phase PWM Controller with Triple Integrated
Driver
G-NAVPTM 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
Single Phase
Fast transient Response
VR Ready Indicator
Thermal Throttling
Current Monitor Output
OVP, UVP, OCP, UVLO
External No-Load Offset Setting
DVID Enhancement
Small 40-Lead WQFN Package
Applications
VR12.5 Intel Core Supply
Notebook/Desktop Computer/Servers Multi-phase CPU
Core Supply
AVP Step-Down Converters
Simplified Application Circuit
To PCH
To CPU
RT8889D
VR_RDY PHASE1
VR_HOT
VCLK
PHASE2
VDIO
ALERT PHASE3
MOSFET
MOSFET
MOSFET
VCORE
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8889D-00 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

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RT8889D equivalent
Operation
The RT8889D adopts the 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).
The RT8889D adopts the G-NAVPTM controller, which is
one type of current mode constant on-time control with
DC offset cancellation. The approach can not only improve
DC offset problem for increasing system accuracy but also
can have fast transient response. For the RT8889D, when
current feedback signal reaches COMP signal to generate
an on-time width to achieve PWM modulation.
TON GEN
Generate the PWM1 to PWM3 sequentially according to
the phase control signal from the Loop Control Protection
Logic.
SVID Interface/Configuration Registers/Control
Logic
The interface that receives the SVID signal from CPU and
sends the relative signals to Loop Control Protection Logic
to execute the action by CPU. The registers save the pin
setting data from ADC output.
The Control Logic controls the ADC timing and generates
the digital code of the VID that is relative to VSEN.
RT8889D
Loop Control Protection Logic
It controls the power on sequence, the protection behavior,
and the operational phase number.
Current Balance
Each phase current sense signal is sent to the current
balance circuit which adjusts the on-time of each phase
to optimize current sharing.
Offset Cancellation
Cancel the current/voltage ripple issue to get the accurate
VSEN.
UVLO
Detect the PVCC and VCC voltage and issue POR signal
as they are high enough.
DAC
Generate an analog signal according to the digital code
generated by Control Logic.
Soft-Start & Slew Rate Control
Control the Dynamic VID slew rate of VSET according to
the SetVID fast or SetVID slow.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8889D-00 April 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for RT8889D electronic component.


Information Total 30 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
RT8889DThe function is 3-Phase PWM Controller. RichtekRichtek

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