●DESCRIPTION
●The LTC®1733 is a standalone constant-current/constant-voltage linear charger for lithium-ion batteries with an on-chip power MOSFET. Internal thermal feedback regulates the charge current to limit die temperature during high power operation or high ambient temperature conditions. This feature allows the user to program a high charge current without risk of damaging the LTC1733 or the handheld product.
●No external current sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture. The charge current and charge time can be set externally with a single resistor and capacitor, respectively. When the input supply (wall adapter) is removed, the LTC1733 automatically enters a low current sleep mode, dropping the battery drain current to less than 5µA.
●FEATURES
●■ Complete Linear Charger for 1-Cell Lithium-Ion Batteries
●■ Thermal Regulation Maximizes Charging Rate without Risk of Overheating
●■ No External MOSFET, Sense Resistor or Blocking Diode Required
●■ Up to 1.5A Charge Current
●■ Preset Charge Voltage with 1% Accuracy
●■ Programmable Charge Current with 7% Accuracy
●■ Programmable Charge Termination Timer
●■ Tiny Thermally Enhanced 10-Pin MSOP Package
●■ Charge Current Monitor Useful for Gas Gauging
●■ C/10 Charge Current Detection Output
●■ Automatic Recharge
●■ Thermistor Input for Temperature Qualified Charging
●■ AC Present Logic Output
●■ 4.1V/4.2V Pin Selectable Output Voltage
●APPLICATIONS
●■ Cellular Telephones
●■ Handheld Computers
●■ Digital Still Cameras
●■ Charging Docks and Cradles
