Datasheet > RT8205LZQW

RT8205LZQW

更新时间： 2024-11-13 01:10:15

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
26页	405K
描述
High Efficiency, Main Power Supply Controller for Notebook Computer

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RT8205LZQW 数据手册

RT8205L/M

High Efficiency, Main Power Supply Controller

for Notebook Computer

General Description

Features

^zConstant On-time Control with 100ns Load Step

The RT8205L/M is a dual step-down, switch mode power

supply controller generating logic-supply voltages in

battery powered systems. It includes two Pulse-Width

Modulation (PWM) controllers adjustable from 2V to 5.5V,

and also features fixed 5V/3.3V linear regulators. Each

linear regulator provides up to 100mA output current with

automatic linear regulator bootstrapping to the PWM

outputs. An optional external charge pump can be

monitored through SECFB (RT8205M). The RT8205L/M

includes on-board power up sequencing, a power good

output, internal soft-start, and internal soft-discharge

output that prevents negative voltage during shutdown.

Response

^zWide Input Voltage Range : 6V to 25V

^zDual Adjustable Outputs from 2V to 5.5V

^zSecondary Feedback Input Maintains Charge Pump

Voltage (RT8205M)

^zFixed 3.3V and 5V LDO Output : 100mA

^z2V Reference Voltage

^zFrequency Selectable via TONSEL Setting

^z4700ppm/°C R_DS(ON)Current Sensing

^zProgrammable Current Limit Combined with

Enable Control

z Selectable PWM, DEM, or Ultrasonic Mode

z Internal Soft-Start and Soft-Discharge

z High Efficiency up to 97%

The constant on-time PWM control scheme operates

without sense resistors and provides 100ns response to

load transient response while maintaining nearly constant

switching frequency. To eliminate noise in audio

applications, an ultrasonic mode is included, which

maintains the switching frequency above 25kHz. Moreover,

the diode-emulation mode maximizes efficiency for light

load applications. The RT8205L/M is available in a

WQFN-24L 4x4 package.

z 5mW Quiescent Power Dissipation

z Thermal Shutdown

z RoHS Compliant and Halogen Free

Applications

z Notebook and Sub-Notebook Computers

z 3-Cell and 4-Cell Li+ Battery-PoweredDevices

Ordering Information

RT8205

Package Type

QW : WQFN-24L 4x4 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Pin Function

L : Default

M : With SECFB

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.

DS8205L/M-05 June 2011

www.richtek.com

12 3 4 5 6 7...26

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与RT8205LZQW相关器件

型号	品牌	获取价格	描述	数据表
RT8205M	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
RT8205MGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
RT8205MZQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
RT8206A	RICHTEK	获取价格	High-Efficiency, Main Power Supply Controllers for Notebook Computers
RT8206AGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controllers for Notebook Computers
RT8206B	RICHTEK	获取价格	High-Efficiency, Main Power Supply Controllers for Notebook Computers
RT8206BGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controllers for Notebook Computers
RT8206L	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8206M	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8207	RICHTEK	获取价格	Complete DDRII/DDRIII Memory Power Supply Controller

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