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