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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 CE 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 SOT23-5L or SOP8
package requiring minimum board space and smallest
components.
■ Applications
? USB 3G/4G/5G 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（SOT23-5L）：3A
--------LN9703SR（SOP8） ：3.5A
? 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)
? Reverse-Voltage Protection
? Thermal Shutdown Protection
? Smallest SOT23-5 and SOP-8 Package
? RoHS Compliant and 100% Lead (Pb)-Free
■ Pin and Markling