General Description The AAT3696S BatteryManager™ is a single-cell lithiumion (Li-Ion)/Li-Polymer battery charger IC, designed to operate from USB ports or AC adapters up to an input voltage of 6.8V. For increased safety, the AAT3696S also includes input over-voltage protection (OVP) up to 28V. The AAT3696S precisely regulates battery voltage after it has reached 4.2V Li-Ion/Polymer battery cells through a low RDS(ON) switch. The charging current can be set by an external resistor up to 1.6A. If an over-voltage condition occurs from the input, a series switch quickly opens and a POK flag is activated, preventing damage to the battery and charging circuitry. Other fault conditions are monitored in real time. In case of battery over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system and the battery under charge. A status monitoring output pin (STAT) is provided to indicate charging activity. This open drain output pin can be used to drive an external LED as a charging indicator. The AAT3696S offers a 5.0V LDO linear regulator. The regulator is protected by the OVP LDO. This LDO can supply up to 50mA load. The AAT3696S comes in the Pb-free, thermally enhanced, space-saving TDFN33-12 (3x3mm) package and is rated over the -40°C to +85°C temperature range. Features • USB or AC Adapter System Power Charger • 3.0V ~ 6.8V Input Voltage Range • Fast Over-Voltage Protection Turn Off • 10μs Typical OVP Turn On Delay Time • OVP Trip at 7.0V (typical) • High Level of Integration with Internal: ? Power Device ? Reverse Current Blocking ? Current Sensing • 5V/50mA LDO Output • Programmable Charge Current from 100mA to 1.6A • Charge Status Indicator • Automatic Recharge Sequencing • Automatic Trickle Charge For Battery Pre-Conditioning • Emergency Thermal Shutdown Protection • Power on Reset and Soft Start • Active Low Enable with Internal 200kΩ Pull-Down Resistor • Two Charge Termination Control Selections ? Continuous to Charge the Battery (Terminate by Disabling the Device Manually) ? Automatic Switch into Sleep State (Charge Termination) • 12-pin 3x3 mm TDFN Package Applications • Bluetooth™ Headsets, Headphones, Accessories • Digital Still Cameras • Personal Data Assistants (PDAs) • Mobile Telephones • MP3 Players • Other Lithium-Ion/Polymer Battery-Powered Devices
