Datasheet > RT8876B

RT8876B

更新时间： 2024-01-17 15:22:37

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
50页	570K
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RT8876B 技术参数

Status：	Active	VID Table Support：	VR12
Number of Phases：	3	Vcc (typ) (V)：	5
Vin (min) (V)：	10.8	Vin (max) (V)：	13.2
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：	WQFN7x7-56
Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS8876B-00.pdf

RT8876B 数据手册

RT8876B

Dual Channel PWM Controller with 3/2/1 Phase for CORE VR

and Single Phase for AXG VR

General Description

Features

^VR12/IMVP7 Compatible Power Management

^3/2/1 Phase for CORE VR and Single Phase for AXG

The RT8876B is a VR12/IMVP7 compliant CPU power

controller which includes two channels : a 3/2/1 phase

with 3 integrated drivers synchronous Buck controller for

the CORE VR, and a single phase Buck controller for the

AXGVR. The RT8876B adoptsG-NAVP^TM(GreenNative

Adaptive Voltage Positioning), which is Richtek's

proprietary topology derived from a finite DC gain

compensator with current mode control, making it an easy

setting PWM controller, meeting all Intel CPU

requirements of AVP. Based on the G-NAVP^TMtopology,

the RT8876B also features a quick response mechanism

for optimizingAVP performance during load transient. The

RT8876B supports mode transition function with various

operating states. A serial VID (SVID) interface is built in

the RT8876B to communicate with Intel VR12/IMVP7

compliant CPU. The RT8876B supports VID on-the-fly

function with three different slew rates : Fast, Slow and

Decay. By utilizing theG-NAVP^TMtopology, the operating

frequency of the RT8876B varies with VID, load and input

voltage 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

RT8876B integrates a high accuracy ADC for platform

setting functions, such as no-load offset or over current

level.

^3 Embedded MOSFET Drivers at the CORE VR

^G-NAVP^TMTopology

^Serial VID Interface

^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

 1.1V_INITIAL/ 0.0V_INITIALfor both Rails at Startup

 Power Ready Indicator

 Thermal Throttling

 Current Monitor Output

 OVP, UVP, OCP, OTP, UVLO

 External No-load Offset Setting for both Rails

 DVID Enhancement

 56-Lead WQFN Package

 RoHS Compliant and Halogen Free

Applications

 VR12/IMVP7 Intel Core Supply

 Notebook/Desktop Computer/ Servers Multi-phase CPU

Core Supply

 AVP Step-Down Converter

Simplified Application Circuit

RT8876B

VR_RDY PHASE1

MOSFET

PHASE2

PHASE3

MOSFET

VRHOT

VCLK

CORE

AXG

To CPU

VDIO

PWMA

RT9612

MOSFET

ALERT

is a registered trademark of Richtek Technology Corporation.

DS8876B-00 August 2015

www.richtek.com

12 3 4 5 6 7...50

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