Datasheet > RT8811B

RT8811B

更新时间： 2024-09-29 17:00:59

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
23页	368K
描述
Dual-Phase COT Buck PWM Controller with Dynamic Voltage Control

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RT8811B 数据手册

RT8811B

Dual-Phase COT Buck PWM Controller with Dynamic Voltage

Control

General Description

Features

^Dual-Phase PWM Controller

The RT8811B is a 2/1 phase synchronous Buck PWM

controller which is optimized for high performance graphic

microprocessor and computer applications. The IC

integrates a Constant-On-Time (COT) PWM controller, two

MOSFET drivers with internal bootstrap diodes, as well

as channel current balance and protection functions

including Over-Voltage Protection (OVP), Under-Voltage

Protection (UVP), current limit, and thermal shutdown into

the WQFN-24L 4x4 package.

^Two Embedded MOSFET Drivers and Embedded

Switching Boot Diode

^External Reference Input Control

^PWM-VID Dynamic Voltage Control

^Dynamic Phase Number Control

^Lossless R_DS(ON)Current Sensing for Current Balance

^Internal Fixed and External Adjustable Soft-Start

^Built-In 220mA 5V LDO

^Adjustable Current Limit Threshold

^Adjustable Switching Frequency

 UVP/OVP Protection

The RT8811B adopts R_DS(ON)current sensing technique.

Current limit is accomplished through continuous inductor-

current-sense, while R_DS(ON)current sensing is used for

accurate channel current balance. Using the method of

current sampling utilizes the best advantages of each

technique.

 Shoot-Through Protection and Short Pulse Free

Technology

 Single IC Supply Voltage : 4.5V to 13.2V

 Support an Ultra-Low Output Voltage as Standby

Voltage

The RT8811B features external reference input and PWM-

VIDdynamic output voltage control, in which the feedback

voltage is regulated and tracks external input reference

voltage. Other features include adjustable switching

frequency, dynamic phase number control, internal/external

soft-start, power good indicator, and enable functions.

 Thermal Shutdown

 Thermal Alert Indicator

 Power Good Indicator

 RoHS Compliant and Halogen Free

Simplified Application Circuit

RT8811B

BOOT1

UGATE1

PHASE1

PVCC

OUT

TON

LGATE

PGOOD

BOOT2

PSI

VID

UGATE2

PHASE2

LGATE2

RGND

GND_SNS

GND

is a registered trademark of Richtek Technology Corporation.

DS8811B-00 November 2013

www.richtek.com

12 3 4 5 6 7...23

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