The LTC4001-1 is a 2A Li-Ion battery charger intended for 5V wall adapters. It utilizes a 1.5MHz synchronous buck converter topology to reduce power dissipation during charging. Low power dissipation, an internal MOSFET and sense resistor allow a physically small charger that can be embedded in a wide range of handheld applications. The LTC4001-1 includes complete charge termination circuitry, automatic recharge and a ±1% 4.1V float voltage. Input short-circuit protection is included so no blocking diode is required. This 4.1V version of the standard LTC4001 is intended for applications which will be operated or stored above approximately 60°C. Under these conditions, the reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells. Battery charge current, charge timeout and end-of-charge indication parameters are set with external components. Additional features include shorted cell detection, temperature qualified charging and overvoltage protection. The LTC4001-1 is available in a low profile (0.75mm) 16-lead (4mm × 4mm) QFN package. Float Voltage LTC4001 4.2V LTC4001-1 4.1V Applications * Handheld Battery-Powered Devices * Handheld Computers * Charging Docks and Cradles * Digital Cameras * Smart Phones * Low Power Dissipation * 2A Maximum Charge Current * No External MOSFETs, Sense Resistor or Blocking Diode Required * Remote Sensing at Battery Terminals * Programmable Charge Termination Timer * Preset 4.1V Float Voltage with ±0.5% Accuracy https://elecena.pl/product/642989/2a-synchronous-buck-li-ion-charger 2008-05-09 https://elecena.pl/product/642989/2a-synchronous-buck-li-ion-charger 2014-07-10 https://elecena.pl/product/642989/2a-synchronous-buck-li-ion-charger 2025-01-19