RT9702/A是低成本单N-MOSFET上壁电源开关 , 适用于自给电及汇流排给电之USB装置 , RT9702系列备有charge pump电力以驱动内部MOSFET开关 , 此开关低Rdson 80mΩ符合USB压降规格 , 侦错旗标输出提供USB控制器使用 , 另外还有涌浪电流缓起动 , 过热保护 , 避免开关在重载下损坏 , 过低压保护确保开关能在正常电压下工作 , 极低的25uA静态电流非常适用于以电池为主之移动式产品。

The RT9702 and RT9702A are cost-effective, low voltage, single N-Channel MOSFET high-side power switches, optimized for self-powered and bus- powered Universal Serial Bus (USB) applications. The RT9702 /A equipped with a charge pump circuitry to drive the internal MOSFET switch; the switch's low R_DS(ON), 80mΩ, meets USB voltage drop requirements; and a flag output is available to indicate fault conditions to the local USB controller.
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, fault current is limited to typically 800mA for RT9702 in single port and 1.5A for RT9702A in dual ports in accordance with the USB power requirements, lower quiescent current as 25μA making this device ideal for portable battery-operated equipment.
The RT9702 /A is available in SOT-23-5 and TSOT-23-5 packages requiring minimum board space and smallest components.

Note :
Richtek Pb-free and Green products are :
► RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
► Suitable for use in SnPb or Pb-free soldering processes.

RT9702 产品规格：
2V ~ 5.5V 输入电压范围
500mA/1.1A 最大电流输出
25uA静态电流
支持热插拔
UL认证许可 E219878
TUV认证许可 IEC60950-1 : 2005
RoHS认证许可

RT9702 产品特性：
• 兼容于USB规格
• 低Rdson 80mΩ
• 过电流保护
• 1.7V输入过低电压保护
• 过热保护机制
• SOT23-5及TSOT23-5小包装
• 逆向电流制止功能

• Compliant to USB Specifications
• Built-In (Typically 80mΩ) N-Channel MOSFET
• Output Can Be Forced Higher Than Input (Off-State)
• Low Supply Current :
  ♦ 25μA Typical at Switch On State
  ♦ 1μA Typical at Switch Off State
• Guaranteed 500mA/RT9702 and 1.1A/RT9702A Continuous Load Current
• Wide Input Voltage Ranges : 2V to 5.5V
• Open-Drain Fault Flag Output
• Hot Plug-In Application (Soft-Start)
• 1.7V Typical Under Voltage Lockout (UVLO)
• Current Limiting Protection
• Thermal Shutdown Protection
• Reverse Current Flow Blocking (no body diode)
• Smallest SOT-23-5 and TSOT-23-5 Packages Minimizes Board Space
• UL Approved-E219878
• TUV IEC60950-1 : 2005 Certified
• RoHS Compliant and 100% Lead (Pb)-Free

• USB汇流排/自给电集线器
• USB外围产品运用
• ACPI电源分配
• 热插拔电源供应系统
• 笔记本电脑及主板
• 电池式产品
• 充电器运用

• USB Bus/Self Powered Hubs
• USB Peripherals
• ACPI Power Distribution
• PC Card Hot Swap
• Notebook, Motherboard PCs
• Battery-Powered Equipment
• Hot-Plug Power Supplies
• Battery-Charger Circuits

(TOP VIEW)
SOT-23-5/TSOT-23-5

Note: A low-ESR 150μF aluminum electrolytic or tantalum between VOUT and GND is strongly recommended to meet the330mV maximum droop requirement in the hub VBUS. (see Application Information Section for further details)