Datasheet > RT9643

RT9643

更新时间： 2024-01-02 16:55:58

品牌	Logo	应用领域
立锜 - RICHTEK		调节器控制器
页数	文件大小	规格书
17页	444K
描述
5 Channel ACPI Regulator with Step-Down DC/DC Controller

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RT9643 数据手册

RT9643

5 Channel ACPI Regulator with Step-Down DC/DC Controller

General Description

Features

^zIntegrated 5 Channels Power Regulator

`DC/DC Buck PWM Regulator for V_DDQ(2.5V or 1.8V)

`Linear Regulator Supports 1.5Amp Peak Sinking/

Sourcing Capability for VTT

The RT9643 is a combo regulator which is compliant to

ACPI specification for desktop/motherboard power

management and system application. The part features

one switch regulator forDDR memory VDDQ power; three

linear regulators including 1.5Amp peak sourcing/sinking

capability regulator forDDR VTT, a 1.2V ultra-low-dropout

linear controller for chipset miscellaneous power, a 3.3VSB

power with 1.25Amp peak current capability; and 2 dual

power control including 5VDL, and 3.3VDL control for S3

and S5 system power. The part totally feature 5 sets power

which are compliant to ACPI specification into a single

small footprint package VQFN-24L 5x5.

`1.2V Ultra-Low-Dropout Linear Controller for

GMCH VTT Power

`3.3VSB Linear Regulator Supports 1.25ACapability

`5VDL Switch Control

`3VDL Switch Control

^zConform to ACPI Specification

`Support Power Management at S0, S3, and S5

State

z 300kHz Fixed Frequency Switching

z R_DS(ON)Current Sensing or Optional Current

Sense Resistor for Precision Over-Current Detect

z Embedded Synchronous Boot-Strapped Diode

z Power Good Signal Indication for All Voltages

z Thermal Shutdown

The part is generally operated to conform to ACPI

specification, in S3 state, there are only VDDQ and

3.3VSB regulators remain on while the VTT and ULDO

regulators are off. In the transition from S3 to S0, an

external SS capacitor is attached for linear regulators to

control its slew rates respectively to avoid inrush current

induced. Moreover, the PGOOD signal raises high in S0

stage while all 3 regulators go stable. In the stage of S5

(EN = 0), there only 3.3VSB LDO remain on, while the

other regulators are powered down. The VDDQ PWM

regulator is a voltage mode implementation with external

compensation to provide high load transient response. The

VTT is regulated to follow 1/2 of VDDQ and is capable of

sourcing or sinking 1.5A peak currents.

z 24-Lead VQFN Package

z RoHS Compliant and 100% Lead (Pb)-Free

Applications

z DDR VDDQ and VTT VoltageGenerator withACPI

Support

z Desktop System Power

z Servers System Power

Pin Configurations

Ordering Information

RT9643

(TOP VIEW)

Package Type

QV : VQFN-24L 5x5 (V-Type)

24 23 22 21 20 19

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

1.2V_DRV

1.2V_FB

S3#I

5VSB_DRV

5V_MAIN

VTT_SNS

VTT_OUT

VCC_EN

3VSB_OUT

VCC

GND

Note :

Richtek Pb-free and Green products are :

`RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

PGOOD

10 11 12

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

`100% matte tin (Sn) plating.

VQFN-24L 5x5

DS9643-03 August 2007

www.richtek.com

12 3 4 5 6 7...17

中文翻译

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与RT9643相关器件

型号	品牌	获取价格	描述	数据表
RT9643_11	RICHTEK	获取价格	5 Channel ACPI Regulator with Step-Down DC/DC Controller
RT9643GQV	RICHTEK	获取价格	5 Channel ACPI Regulator with Step-Down DC/DC Controller
RT9643PQV	RICHTEK	获取价格	5 Channel ACPI Regulator with Step-Down DC/DC Controller
RT9644	RICHTEK	获取价格	ACPI Regulator/Controller for Dual Channel DDR Memory Systems
RT9644AGQV	RICHTEK	获取价格	ACPI Regulator/Controller for Dual Channel DDR Memory Systems
RT9644APQV	RICHTEK	获取价格	ACPI Regulator/Controller for Dual Channel DDR Memory Systems
RT9644GQV	RICHTEK	获取价格	ACPI Regulator/Controller for Dual Channel DDR Memory Systems
RT9644PQV	RICHTEK	获取价格	ACPI Regulator/Controller for Dual Channel DDR Memory Systems
RT9645	RICHTEK	获取价格	5 Channels ACPI Regulator
RT9645GQV	RICHTEK	获取价格	5 Channels ACPI Regulator

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