Datasheet > RT9721A

RT9721A

更新时间： 2024-09-15 12:23:39

品牌	Logo	应用领域
立锜 - RICHTEK		开关电源开关
页数	文件大小	规格书
13页	204K
描述
80mÎ©, 500mA High-Side Power Switches with Flag

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数据手册

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RT9721A 数据手册

RT9721A/B

80mΩ, 500mA High-Side Power Switches with Flag

General Description

Features

^zCompliant to USB Specifications

The RT9721A/B are low voltage, singleN-MOSFET high-

side power switches, optimized for self-powered and bus-

powered Universal Serial Bus (USB) applications. The

RT9721A/B series provides a charge pump circuitry to drive

^zBuilt-In N-MOSFET

` Typical R_DS(ON): 80mΩ

^zOutput Can Be Forced to Higher Than Input (Off-

State)

the internal MOSFET switch; the switch's low R_DS(ON)

^zLow Supply Current :

80mΩ, meets USB voltage drop requirements; and a flag

output is available to indicate fault conditions to the local

USB controller.

` 50μA Typical at Switch On State

` 0.1μA Typical at Switch Off State

^zGuaranteed 500mA Continuous Load Current

^zWide Input Voltage Ranges : 2.5V to 5.5V

^zOpen-Drain Fault Flag Output

^zHot Plug-In Application (Soft-Start)

z 2.15V Typical Under-Voltage Lockout (UVLO)

z Current Limiting Protection

Additional features include soft-start to limit inrush current

during plug-in, thermal shutdown to prevent catastrophic

switch failure from high-current loads, under-voltage lockout

(UVLO) to ensure that the device remains off unless there

is a valid input voltage present. The maximum current is

limited to typically 750mAin dual ports in accordance with

the USB power requirements, lower quiescent current as

50uAmaking this device ideal for portable battery-operated

equipment.

z Thermal Shutdown Protection

z Reverse Current Flow Blocking (no body diode)

z UL Approved−E219878

z RoHS Compliant and Halogen Free

The RT9721A is designed without output auto-discharge

function and RT9721B is designed with output auto-

discharge function.

Applications

z USB Bus/Self Powered Hubs

z USB Peripherals

The RT9721A/B are available in SOT-23-5 package

requiring minimum board space and smallest components.

z Notebook, Motherboard PCs

Pin Configurations

Ordering Information

(TOP VIEW)

RT9721

Package Type

VOUT

FLG

B : SOT-23-5

Lead Plating System

G : Green (Halogen Free and Pb Free)

Output Discharge Function

VIN GND

A : Without Auto-Discharge Function

B : With Auto-Discharge Function

SOT-23-5

Note :

Marking Information

Richtek products are :

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

` 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.

DS9721A/B-02 April 2011

www.richtek.com

12 3 4 5 6 7...13

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