The LTC4061EDD is a full-featured, flexible, standalone linear charger for single-cell Lithium-Ion batteries. It is capable of operating within USB power specifications.
Both programmable time and programmable current based termination schemes are available. Furthermore, the CHRG open-drain status pin can be programmed to indicate the battery charge state according to the needs of the application. Additional safety features designed to maximize battery lifetime and reliability include NTC battery temperature sensing and the SmartStart charging algorithm.
No external sense resistor or external blocking diode is required for charging due to the internal MOSFET architecture. Internal thermal feedback regulates the charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The charge current is programmed with an external resistor. With power applied, the LTC4061EDD can be put into shutdown mode to reduce the supply current to 20μA and the battery drain current to less than 5μA.
Other features include smart recharge, USB C/5 current programming input, undervoltage lockout and AC Present logic output.
Float Voltage (V) LTC4061 4.2VLTC4061-4.4 4.4VFeature
- Charge Current Programmable Up to 1A
- Charges Single-Cell Li-Ion Batteries Directly from USB Port
- Preset Charge Voltage with ±0.35% Accuracy
- Thermistor Input for Temperature Qualified Charging
- Input Supply Present Logic Output
- Thermal Regulation Maximizes Charge Rate Without Risk of Overheating
- Programmable Charge Current Detection/ Termination
- Programmable Charge Termination Timer
- Smart Pulsing Error Feature
- SmartStart™ Prolongs Battery Life
- 20μA Charger Quiescent Current in Shutdown
- Available in a Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package
Applications
- Handheld Computers
- Portable MP3 Players
- Digital Cameras
(Picture: Pinout)
