■ General Description The LN9703 is a low voltage, high performance  single N-MOSFET power switch, designed for power  rail on/off control with low RDS(ON)≈70mΩ and full  protection functions. The LN9703 equipped with a  charge pump circuitry to drive the internal MOSFET  switch and a flag output is available to indicate fault  conditions against large di/dt which may cause the  supply to fall out of regulation. In order to fit different  application, an ISET pin is offered for current limit  point setting, a resistor from ISET to ground sets the  current limit for the switch.  Additional features include soft-start to limit  inrush current during plug-in, thermal shutdown to  prevent catastrophic switch failure from high-current  loads, Output anti back irrigation Protection whether  EN pin is connected GND or VIN, under-voltage  lockout (UVLO) to ensure that the device remains off  unless there is a valid input voltage present, a precision  resistor-programmable output current limit up to 3.5A.  Besides, the lower quiescent current as 40μA making  this device ideal for portable battery-operated  equipment. The LN9703 is available in SOT23-5 or SOP-8  package requiring minimum board space and smallest  components.
■ Applications  USB 3G Datacard   USB Dongle   MiniPCI Accessories  LCD Monitor, LCD-TV  USB Power Module for ADSL  Information Appliance and Set-Top Box  Battery-Powered Equipment  Hot-Plug Power Supplies  ACPI Power Distribution  PCI Bus Power Switching  Motherboard & Notebook PCs  PC Card Hot Swap Application
■ Features   Adjustable Current Limiting up to 3.5A  Built-In (Typically 70mΩ) N-MOSFET  Reverse Current Flow Blocking (no body diode)   Output Can Be Forced Higher than Input (Off or  On State)  Low Supply Current : --------40μA Typical at Switch on State --------Less than 1μA Typical at Switch Off State  Guaranteed Continuous Load Current --------LN9703MR（SOT23-5）：2.1A --------LN9703SR（SOP-8） ：3A  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)  Thermal Shutdown Protection  Smallest SOT23-5 and SOP-8 Package  RoHS Compliant and 100% Lead (Pb)-Free