Datasheet > BuckCont> RT8206B

RT8206B

更新时间： 2024-01-02 14:53:59

品牌	Logo	应用领域
立锜 - RICHTEK		电脑控制器
页数	文件大小	规格书
26页	360K
描述
High-Efficiency, Main Power Supply Controllers for Notebook Computers

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技术参数
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RT8206B 技术参数

Status：	Active	Vs (typ) (V)：	19
Vin (min) (V)：	6	Vin (max) (V)：	25
Vout (min) (V)：	2	Vout (max) (V)：	5.5
Preset Vout (V)：	3.3;5	Output Adj. Method：	Fixed;Resistor
Accuracy (+/- %)：	1.5	Freq (typ) (kHz)：	300;375
Freq (min) (kHz)：	200	Freq (max) (kHz)：	500
Iq (typ) (mA)：	0.18	Features：	Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;Fast Transient Response;OCP;OVP;Power Good;SCP;UVP;Ultrasonic Mode Control
Package Type：	WQFN5x5-32

RT8206B 数据手册

RT8206A/B

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 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.

^zSecondary Feedback Input Maintains Charge Pump

Voltage (RT8206A)

^zIndependent Enable and Power Good

^z5V Fixed LDO Output : 70mA

^z2V Reference Voltage 1% : 50uA

^zConstant ON-Time Control with 100ns Load Step

Response

^zFrequency Selectable via TON Setting

z R_DS(ON)Current Sensing and Programmable Current

Limit

z Selectable PWM, DEM or Ultrasonic Mode

z Internal Soft-Start with 5 Steps Current Limiting and

Soft-Discharge

Aconstant 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.

z High Efficiency Up to 97%

z 5mW Quiescent Power Dissipation

z Thermal Shutdown

z RoHS Compliant and Halogen Free

Ordering Information

RT8206

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

package.

Package Type

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

Operating Temperature Range

G : Green (Halogen Free with Commer-

cial Standard)

Applications

z Notebook and Sub-Notebook Computers

A : With SECFB

B : Without SECFB

z 3-Cell and 4-Cell Li+ Battery-PoweredDevices

Note :

Richtek Green 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.

DS8206A/B-03 December 2009

www.richtek.com

12 3 4 5 6 7...26

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