ADI LTC4001EUF#TRPBF

A 2A lithium-ion battery charger for 5V AC adapters. It employs a 1.5MHz synchronous buck converter topology to minimize power dissipation during charging. Low power consumption, an internal MOSFET, and sense resistor enable a miniaturized charger that can be embedded in a wide variety of handheld applications. Features include a complete charge termination circuit, automatic recharge function, and a 4.2V float voltage with ±1% accuracy. The integrated input short-circuit protection circuit eliminates the need for an isolation diode. Battery charge current, charge timeout, and end-of-charge indication parameters are set using external components. Additional features include battery short-circuit detection, temperature-qualified charging, and overvoltage protection. Available in a low-profile (0.75mm height) 16-pin (4mm×4mm) QFN package.

• Low power consumption
• 2A maximum charge current
• No external MOSFET, sense resistor, or isolation diode required
• Remote sensing at battery terminals
• Programmable charge termination timer
• 4.2V preset float voltage with ±0.5% accuracy
• Programmable charge current sense/termination
• Automatic recharge
• Thermistor input for temperature-qualified charging
• Compatible with current-limited AC adapters
• 16-pin (4mm×4mm) flat QFN package

• Handheld battery-powered devices
• Handheld computers
• Charging docks
• Digital cameras
• Smartphones