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LN9703
■ 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
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