Datasheet > RT8205BGQW

RT8205BGQW

更新时间： 2024-01-16 16:24:39

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
28页	497K
描述
High Efficiency, Main Power Supply Controllers for Notebook Computers

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RT8205BGQW 数据手册

RT8205A/B/C

High Efficiency, Main Power Supply Controllers

for Notebook Computers

General Description

Features

^zWide Input Voltage Range 6V to 25V

^zDual Fixed 5V/3.3V Outputs or Adjustable from 2V

to 5.5V, 1.5% Accuracy.

The RT8205A/B/C dual step-down, switch-mode power-

supply controller generates logic-supply voltages in

battery-powered systems. The RT8205A/B/C includes two

pulse-width modulation (PWM) controllers fixed at 5V/

3.3V or adjustable from 2V to 5.5V.An alternative LGATE1

output LG1_CP can be used for external charge pump

(RT8205B).And an optional external charge pump can be

monitored through SECFB (RT8205C). This device also

features 2 linear regulators providing fixed 5V and 3.3V

outputs. The linear regulator each provides up to 70mA

output current with automatic linear-regulator bootstrapping

to the PWM outputs. The RT8205A/B/C includes on-board

power-up sequencing, the power-good output, internal soft-

start, and internal soft-discharge output that prevents

negative voltages on shutdown.

^zAlternative LGATE1 Output (LG1_CP) acts as Clock

for Charge Pump (RT8205B)

^zSecondary Feedback Input Maintains Charge Pump

Voltage (RT8205C)

^zFixed 3.3V and 5V LDO Output : 70mA

^z2V Reference Voltage 1% : 50μA

^zConstant ON-Time Control with 100ns Load Step

Response

z Frequency Selectable via TONSEL Setting

z R_DS(ON)Current Sensing and Programmable 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%

Aconstant on-time PWM control scheme operates without

sense resistor and provides 100ns response to load

transients while maintaining a relatively constant switching

frequency. The unique ultrasonic mode maintains the

switching frequency above 25kHz, which eliminates noise

in audio applications. Other features include diode-

emulation mode (DEM), which maximizes efficiency in

light-load applications, and fixed-frequency PWM mode,

which reduces RF interference in sensitive application

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)

Note :

Lead Plating System

Richtek products are :

G : Green (Halogen Free and Pb Free)

` 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.

Pin Function

A : Default

B : With LG1_CP

C : With SECFB

is a registered trademark of Richtek Technology Corporation.

DS8205A/B/C-06 July 2012

www.richtek.com

12 3 4 5 6 7...28

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与RT8205BGQW相关器件

型号	品牌	获取价格	描述	数据表
RT8205C	RICHTEK	获取价格	High Efficiency, Main Power Supply Controllers for Notebook Computers
RT8205CGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controllers for Notebook Computers
RT8205L	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
RT8205LGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
RT8205LZQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computer
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

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