Datasheet > VcoreCont> RT8856

RT8856

更新时间： 2024-02-06 04:04:26

品牌	Logo	应用领域
立锜 - RICHTEK		电压核心转换多相元件控制器
页数	文件大小	规格书
23页	373K
描述
Multi-Phase PWM Controller for CPU Core Power Supply

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RT8856 技术参数

Status：	Active	VID Table Support：	IMVP6.5
Number of Phases：	2	Vcc (typ) (V)：	5
Vin (min) (V)：	7	Vin (max) (V)：	24
Accuracy (Vout>=1V) (+/- %)：	0.8	Freq (typ) (kHz)：	300
Built-in DAC Generator：	Yes	Number of MOSFET Drivers：	2
Features：	Adjustable Frequency;Adjustable Soft-Start;DCR Current Sense;Droop Control;Enable Input;OCP;OVP;Power Good;SCP;Voltage Mode Control	Package Type：	WQFN6x6-40
Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS8856-05.pdf

RT8856 数据手册

RT8856

Multi-Phase PWM Controller for CPU Core Power Supply

General Description

Features

^z1/2 Phase PWM Controller with 2 Integrated

The RT8856 is a single/dual phase PWM controller with

two integrated MOSFET drivers. Moreover, it is compliant

with Intel IMVP6.5 Voltage Regulator Specification to fulfill

its mobile CPU Vcore power supply requirements. The

RT8856 adoptsNAVP^TM(NativeAVP) which is Richtek's

proprietary topology derived from finite DC gain

compensator peak current mode, making it an easy setting

PWM controller that meets all Intel AVP (Active Voltage

Positioning) mobile CPU requirements.

MOSFET Drivers

^zIMVP6.5 Compatible Power Management States

(DPSRLVR, PSI, Extended Deeper Sleep Mode)

^zNAVP (Native AVP) Topology

^z7-bit DAC

^z0.8% DAC Accuracy

^zFixed V_BOOT(1.1V)

^zDifferential Remote Voltage Sensing

^zProgrammable Output Transition Slew Rate Control

^zAccurate Current and Thermal Balance

^zSystem Thermal Compensation AVP

z Ringing Free Mode at Light Load Conditions

z Fast Transient Response

The output voltage of the RT8856 is set by 7-bit VID code.

The built-in high accuracy DAC converts the VID code

ranging from 0V to 1.5V with 12.5mV per step. The system

accuracy of the controller can reach 1.5%. The part

supports VID on-the-fly and mode change on-the-fly

functions that are fully compliant with IMVP6.5

specification. It operates in single phase, dual phase and

RFM. It can reach up to 90% efficiency in different modes

according to different loading conditions. The droop load

line can be easily programmed by setting the DC gain of

the error amplifier. With proper compensation, the load

transient can achieve optimized AVP performance. This

chip controls soft-start and output transition slew rate via

a capacitor. It supports both DCR and sense resistor

current sensing. The current modeNAVP^TMtopology with

high accuracy current sensing amplifier well balances the

RT8856's channel currents.

z Power Good

z Clock Enable Output

z Thermal Throttling

z Current Monitor Output

z Switching Frequency up to 1MHz Per Phase

z OVP, UVP, NVP, OCP, OTP, UVLO

z 40-Lead WQFN Package

z RoHS Compliant and Halogen Free

Ordering Information

RT8856

Package Type

QW : WQFN-40L 6x6 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

The RT8856 provides power good, clock enabling and

thermal throttling output signals for IMVP6.5 specification.

It also features complete fault protection functions

including over voltage, under voltage, negative voltage, over

current, thermal shutdown, and under voltage lockout.

Note :

Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

The RT8856 is available in a WQFN-40L 6x6 small foot

print package.

Marking Information

Applications

z IMVP6.5 Core Supply

RT8856GQW : Product Number

RT8856

GQW

YMDNN : Date Code

z Multi-phase CPU Core Supply

z AVP Step-Down Converter

z Notebook/Desktop Computer/ Servers

YMDNN

DS8856-03 June 2011

www.richtek.com

12 3 4 5 6 7...23

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