Datasheet > RT8888D

RT8888D

更新时间： 2024-01-14 16:32:53

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
44页	681K
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RT8888D 技术参数

Status：	Active	VID Table Support：	VR12.5
Number of Phases：	3	Vcc (typ) (V)：	5
Vin (min) (V)：	5	Vin (max) (V)：	25
Accuracy (Vout>=1V) (+/- %)：	0.5	Freq (typ) (kHz)：	300
Built-in DAC Generator：	Yes	Number of MOSFET Drivers：	3
Features：	OCP;OVP;Power Good;UVP	Package Type：	WQFN5x5-40

RT8888D 数据手册

RT8888D

3-Phase Controller with Triple Integrated Driver for VR12.5

Mobile CPU Core Power Supply

General Description

Features

^Intel VR12.5 Serial VID Interface Compatible

^3/2/1 Phase PWM Controller with Triple Integrated

Driver

The RT8888Dis a three phase CPU power controller with

triple integrated driver for VR12.5 compliant. The RT8888D

adopts the G-NAVP^TM(Green Native AVP) which is

Richtek's proprietary topology derived from finiteDC 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-

NAVP^TMtopology, the RT8888D also features a quick

response mechanism for optimized AVP performance

during load transient. The RT8888D supports mode

transition function with various operating states. A Serial

VID (SVID) interface is built in the RT8888D to

communicate with Intel VR12.5 compliant CPU. The

RT8888D supports VID on-the-fly function with three

different slew rates : Fast, Slow and Decay. By utilizing

the G-NAVP^TMtopology, the operating frequency of the

RT8888D varies with VID, load current and input voltage

to further enhance the efficiency even in CCM. Besides

the G-NAVP^TM, 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 RT8888D

integrates a high accuracy ADC for platform setting

functions, such as no-load offset and over current

protection level. The RT8888D provides VR ready output

signals. 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 RT8888Dis available in the WQFN-40L 5x5

small foot print package.

^G-NAVP^TMTopology

^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

 RoHS Compliant and Halogen Free

Applications

 VR12.5 Intel Core Supply

 Notebook/Desktop Computer/Servers Multi-phase CPU

Core Supply

 AVP Step-Down Converter

Simplified Application Circuit

RT8888D

To PCH

VR_RDY PHASE1

MOSFET

VR_HOT

VCLK

VDIO

PHASE2

PHASE3

MOSFET

CORE

To CPU

ALERT

is a registered trademark of Richtek Technology Corporation.

DS8888D-00 August 2015

www.richtek.com

12 3 4 5 6 7...44

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