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LTC4059 - 900mA Linear Li-Ion Battery Chargers

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U U LTC4059/LTC4059A 900mA Linear Li-Ion Battery Chargers with Thermal Regulation in 2 × 2 DFN FEATURES DESCRIPTIO ■ Programmable Charge Current Up to 900mA ■ Charge Current Monitor Output for Charge Termination ■ Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charging Rate Without Risk of Overheating ■ Constant-Current Source Mode for Charging Nickel Batteries (LTC4059 Only) ■ ACPR Pin Indicates Presence of Input Supply (LTC4059A Only) ■ No External MOSFET, Sense Resistor or Blocking Diode Required ■ Operating Supply Voltage from 3.75V to 8V ■ Charges Single Cell Li-Ion Batteries Directly from USB Port ■ Preset 4.2V Charge Voltage with 0.