Features

• Charge Current Programmable up to 1A
• Charges Single Cell Li-Ion Batteries Directly from USB Port
• Preset Float Voltage with ±0.35% Accuracy
• Micropower Comparator for Battery Monitoring
• Thermal Regulation Maximizes Charge Rate Without Risk of Overheating*
• Programmable Charge Current Detection/Termination
• Programmable Charge Termination Timer
• Smart Pulsing Error Feature
• SmartStart^TM Prolongs Battery Life
• 20µA Charger Quiescent Current in Shutdown
• Available in a Low Profile (0.75mm) 10-Lead
  (3mm × 3mm) DFN Package

Typical Application

Description

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. A precise low power comparator is available even with no power applied as long as battery voltage is higher than 2.5V. Additional safety features designed to maximize battery lifetime and reliability include 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 LTC4062 can be put into shutdown mode to reduce the supply current to 20µA and the battery drain current to less than 5µA. Without power applied, the internal low power comparator can work sinking only 10µA from the battery.

Other features include smart recharge, USB C/5 current programming input and undervoltage lockout.

*Protected by U.S. Patents, including 6522118.