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RT8205MGQW PDF预览

RT8205MGQW

更新时间: 2024-02-28 20:05:31
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

RT8205MGQW 数据手册

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RT8205L/M  
High Efficiency, Main Power Supply Controller  
for Notebook Computer  
General Description  
Features  
z Constant 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  
z Wide Input Voltage Range : 6V to 25V  
z Dual Adjustable Outputs from 2V to 5.5V  
z Secondary Feedback Input Maintains Charge Pump  
Voltage (RT8205M)  
z Fixed 3.3V and 5V LDO Output : 100mA  
z 2V Reference Voltage  
z Frequency Selectable via TONSEL Setting  
z 4700ppm/°C RDS(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 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  
1

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