LTC4055EUF#PBF

LTC4055 is a USB power manager and Li-ion battery charger designed to work in portable battery-powered applications. The parts manage and limit the total current used by the USB peripheral for operation and battery charging. Depending on the state of the current select pin (HPWR), total input current can be limited to either 100mA or 500mA. The voltage drop from the USB supply or battery to the USB peripheral is typically less than 100mV at 400mA and 20mV at 80mA. Other management features include: automatic switchover to battery when input is removed, inrush current limiting, reverse current blocking, undervoltage lockout and thermal shutdown. It includes a complete constant current/constant-voltage linear charger for single-cell Li-ion batteries. The float voltage applied to the battery is held to a tight 0.8% tolerance, and charge current is programmable using an external resistor to ground. It is used in applications like portable USB devices: cameras, MP3 players, PDAs etc.

• Charges single-cell Li-ion batteries directly from USB port
• Load dependent charging guarantees USB input current compliance
• Automatic battery switchover when input supply is removed
• USB-compliant suspend mode, programmable charge current and termination timer
• Soft-start limits inrush current, NTC thermistor input for temperature qualified charging
• Input supply voltage from 4.35V to 5.5V
• Input supply current is 1.6mA typ at (VBAT = 4.2V, TA = 25°C)
• Current limit is 490mA typ at (RCLPROG = 100K, HPWR = 5V, TA = 25°C)
• Operating temperature range from -40°C to 85°C
• Package style is 16-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party