RT8205CGQW datasheet(1/28 Pages) RICHTEK

部件名	RT8205CGQW

功能描述	High Efficiency, Main Power Supply Controllers for Notebook Computers

PDF	28 Pages

Scroll/Zoom	100%

制造商	RICHTEK [Richtek Technology Corporation]

网页	http://www.richtek.com

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1 / 28 page

RT8205A/B/C

®

DS8205A/B/C-06 July 2012

www.richtek.com

1

©

is a registered trademark of Richtek Technology Corporation.

Ordering Information

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.

Applications

Notebook and Sub-Notebook Computers

3-Cell and 4-Cell Li+ Battery-Powered Devices

High Efficiency, Main Power Supply Controllers

for Notebook Computers

General Description

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.

A constant 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

Features

Wide Input Voltage Range 6V to 25V

Dual Fixed 5V/3.3V Outputs or Adjustable from 2V

to 5.5V, 1.5% Accuracy.

Alternative LGATE1 Output (LG1_CP) acts as Clock

for Charge Pump (RT8205B)

Secondary Feedback Input Maintains Charge Pump

Voltage (RT8205C)

Fixed 3.3V and 5V LDO Output : 70mA

2V Reference Voltage

±1% : 50μμμμμA

Constant ON-Time Control with 100ns Load Step

Response

Frequency Selectable via TONSEL Setting

RDS(ON) Current Sensing and Programmable Current

Limit combined with Enable Control

Selectable PWM, DEM, or Ultrasonic Mode

Internal Soft-Start and Soft-Discharge

High Efficiency up to 97%

5mW Quiescent Power Dissipation

Thermal Shutdown

RoHS Compliant and Halogen Free

Package Type

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

Lead Plating System

G : Green (Halogen Free and Pb Free)

RT8205

Pin Function

A : Default

B : With LG1_CP

C : With SECFB

类似零件编号 - RT8205CGQW

制造商	部件名	数据表	功能描述
Richtek Technology Corp...	RT8205EGQW	405Kb / 26P	High Efficiency, Main Power Supply Controller for Notebook Computer
	RT8205L	405Kb / 26P	High Efficiency, Main Power Supply Controller for Notebook Computer
	RT8205LGQW	405Kb / 26P	High Efficiency, Main Power Supply Controller for Notebook Computer
	RT8205LZQW	405Kb / 26P	High Efficiency, Main Power Supply Controller for Notebook Computer
	RT8205M	405Kb / 26P	High Efficiency, Main Power Supply Controller for Notebook Computer

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