RT8206A RICHTEK [Richtek Technology Corporation], RT8206A Datasheet

RT8206A

Manufacturer Part Number

RT8206A

Description

High-Efficiency, Main Power Supply Controllers for Notebook Computers

Manufacturer

RICHTEK [Richtek Technology Corporation]

Datasheet

1.RT8206A.pdf (26 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

BOSTOCK HK LIMITED

Part Number:

RT8206AGQW

Manufacturer:

RICHTEK

Quantity:

8 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

RT8206AGQW

Manufacturer:

RICHTEK/立锜

Quantity:

20 000

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Download datasheet (443Kb)

DS8206A/B-04 March 2011

High-Efficiency, Main Power Supply Controllers

for Notebook Computers

General Description

The RT8206A/B dual step-down, switch-mode power-

supply (SMPS) controller generates logic-supply voltages

in battery-powered systems. The RT8206A/B includes two

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

3.3V or adjustable from 2V to 5.5V. An optional external

charge pump can be monitored through SECFB

(RT8206A). This device also features a linear regulator

providing a fixed 5V output. The linear regulator provides

up to 70mA output current with automatic linear-regulator

bootstrapping to the BYP input. The RT8206A/B includes

on-board power-up sequencing, the power-good outputs,

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

prevents negative voltages on shutdown.

A constant on-time PWM control scheme operates without

sense resistors 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.

The RT8206A/B is available in the WQFN-32L 5x5

package.

Applications

Notebook and Sub-Notebook Computers

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

Features

Ordering Information

Note :

Richtek Green products are :

RT8206

Wide Input Voltage Range 6V to 25V

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

to 5.5V, 1.5% Accuracy

Secondary Feedback Input Maintains Charge Pump

Voltage (RT8206A)

Independent Enable and Power Good

5V Fixed LDO Output : 70mA

2V Reference Voltage ± ± ± ± ± 1% : 50uA

Constant ON-Time Control with 100ns Load Step

Response

Frequency Selectable via TON Setting

Limit

Selectable PWM, DEM or Ultrasonic Mode

Internal Soft-Start with 5 Steps Current Limiting and

Soft-Discharge

High Efficiency Up to 97%

5mW Quiescent Power Dissipation

Thermal Shutdown

RoHS Compliant and Halogen Free

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.

ments of IPC/JEDEC J-STD-020.

DS(ON)

Current Sensing and Programmable Current

Package Type

QW : WQFN-32L 5x5 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

A : With SECFB

B : Without SECFB

RT8206A/B

www.richtek.com

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