Monolithic Linear Lithium-Ion Battery Charger with Thermal Regulation
The LTC®1733 is a standalone constant-current/ constant-voltage linear charger for lithium-ion batterieswith 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.
The LTC1733 also includes NTC temperature sensing, C/10 detection circuitry, AC present logic, 4.1V/4.2V pin selectability and low battery charge conditioning (trickle charging).
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
Thermistor Input for Temperature Qualified Charging