Datasheet > RT8223N

RT8223N

更新时间： 2024-01-10 00:16:31

品牌	Logo	应用领域
立锜 - RICHTEK		电脑控制器
页数	文件大小	规格书
23页	370K
描述
High Efficiency, Main Power Supply Controller for Notebook Computer

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RT8223N 数据手册

RT8223N

High Efficiency, Main Power Supply Controller

for Notebook Computer

Features

General Description

z Constant On-time Control with 100ns Load Step

The RT8223N 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. The RT8223N includes on-board power up

sequencing, a power good output, internal soft-start, and

soft-discharge output that prevents negative voltage during

shutdown.

Response

z Wide Input Voltage Range : 6V to 25V

z Dual Adjustable Outputs from 2V to 5.5V

z Fixed 3.3V and 5V LDO Output : 100mA

z 2V Reference Voltage

z Frequency Selectable via TONSEL Setting

z 4700ppm/°C R_DS(ON)Current Sensing

z 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%

The constant on-time PWM scheme can operate without

sense resistors and provide 100ns 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

RT8223Nis 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

RT8223N

Marking Information

RT8223NGQW

Package Type

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

11= : Product Code

YMDNN : Date Code

11=YM

DNN

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

RT8223NZQW

Note :

11 : Product Code

YMDNN : Date Code

Richtek products are :

11 YM

DNN

` 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.

DS8223N-03 April 2011

www.richtek.com

12 3 4 5 6 7...23

中文翻译

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