LN2054 Series
 MAIN PARAMETERS
         Vin=4.25-6.5(V)   MAX Charge Current=500mA   Iss=2.5uA   Charge Status:Y   Battery Recharge:Y   
         Package:SOT-23-5L,SOT-89-5L
         Pin to Pin Compatible:LTC4054
 DESCRIPTION
         The LN2054 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the LN2054 ideally suited for portable applications. Furthermore, the LN2054 is specifically designed to work within USB power specifications. 
         No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The LN2054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. 
         When the input supply (wall adapter or USB supply) is removed, the LN2054 automatically enters a low current state, dropping the battery drain current to less than 2μA. The LN2054 can be put into shutdown mode, reducing the supply current to 25μA. 
         Other features include charge current monitor, under-voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.
 FEATURES
         Programmable charge current up to 500mA 
         No MOSFET, sense resistor or blocking diode required 
         Complete linear charger in ThinSOT package for single cell lithium-ion batteries 
         Constant-current/Constant-voltage operation with thermal regulation to maximize Charge rate without risk of overheating 
         Charges single cell li-Ion batteries directly from USB port 
         Preset 4.2V charge voltage with ±1% accuracy 
         Charge current monitor output for gas gauging 
         Automatic recharge 
         Charge status output pin 
         C/10 charge termination 
         25μA supply current in shutdown 
         2.9V trickle charge threshold (LN2054) 
         Soft-Start Limits Inrush Current
 APPLICATIONS
         Cellular telephones, PDAs, MP3 players 
         Charging docks and cradles 
         Bluetooth applications

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