General Description
The AAT3686 BatteryManager is a highly integrated single-cell lithium-ion/polymer battery charger IC designed to operate with USB port and AC adapter inputs. It requires the minimum number of external components.
The AAT3686 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells.
Adapter charge current rates can be programmed up to 1.5A. In the absence of an adapter and with a USB port connected, the battery can also be charged by USB power.
Depending on the USB port type, the AAT3686 charge current can be programmed for two separate levels up to 500mA. An optional Charge Reduction Loop is also built in to allow users to charge the battery with available current from a USB port, while keeping the port voltage regulated.
USB charging is disabled when an adapter is present.
Battery temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. Status monitor output pins are provided to indicate the battery charge status by directly driving two external LEDs. A serial interface output is available to report 22 various status states to a microcontroller.
The AAT3686 is available in a Pb-free, thermallyenhanced, space-saving TDFN34-16 (3x4mm) or TDFN44-16 (4x4mm) package and is rated over the -40°C to +85°C temperature range.
Features
• USB Port/AC Adapter System Power Charger
? USB: Programmable to 500mA for USB Hi/Lo
? Adapter: Programmable to 1.5A Max
• 4.0V to 5.5V Input Voltage Range
• Adapter Present Indicator (ADPP# Pin)
• Adapter Presence Automatically Disables USB Charging
• High Level of Integration With Internal:
? Charging Devices
? Reverse Blocking Diodes
? Current Sensing
• Automatic Recharge Sequencing
• Digital Thermal Regulation in ADP Charge
• Charge Reduction Loop in USB Charge
• Battery Temperature Monitoring
• Full Battery Charge Auto Turn-Off
• Over-Voltage and Emergency Thermal Protection
• Power On Reset and Soft Start
• Serial Interface Status Reporting
• TDFN34-16 or TDFN44-16 Package
Applications
• Cellular Telephones
• Digital Still Cameras
• Hand-Held PCs
• MP3 Players
• Personal Data Assistants (PDAs)
• Other Lithium-Ion/Polymer Battery-Powered Devices
Click to view :
AAT3686.pdf
