LTC4085EDE#PBF

LTC4085 is a USB power manager and Li-ion battery charger designed for portable battery-powered applications. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100mA or 500mA). Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. 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. An end-of-charge status output CHRG indicates full charge. Total charge time is programmable by an external capacitor to ground. It is used in applications such as portable USB devices: cameras, MP3 players, PDAs.

• Seamless transition between input power sources: Li-ion battery, USB and 5V wall adapter
• Load dependent charging guarantees accurate USB input current compliance
• Selectable 100% or 20% input current limit
• Battery charge current independently programmable upto 1.2A
• Preset 4.2V charge voltage with 0.8% accuracy
• C/10 charge current detection output
• Input supply voltage from 4.35V to 5.5V
• Supply current is 1.2mA typ at (TA = 25°C, VIN = 5V)
• Operating temperature range from -40°C to 85°C
• Package style is 14-lead plastic DFN

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