Advanced Analogic Technologies has introduced its AAT3783, a 1-ampere linear Li-ion/Polymer battery charger IC with an integrated over-voltage protection (OVP) switch. Designed to charge 4.2-V Li-ion/polymer battery cells from either AC or USB inputs, the new charger IC also features a digital thermal management system that maximizes charging efficiency and shortens battery recharge time.

By integrating an isolated OVP switch, the AAT3783 battery charger IC protects against single point failures up to 28V while reducing component count and simplifying design.

The AAT3783 comprises a charging device, a reverse blocking diode and current sensing circuitry in a single die. It operates off a 4.0-V to 7.5-V input range and supplies a current that is programmable from 100 milliamperes to 1 ampere.

To maximize charging current under all operating conditions, the AAT3783 features a digital thermal management system that measures the internal die temperature and reduces the fast charge current when the device exceeds a preset threshold. This thermal loop control continually re-evaluates the circuit die temperature and adjusts the fast charge current up or down in small steps until an equilibrium current is reached. Since the thermal loop controls the system charge level, it maximizes charging efficiency by ensuring the charger will use the highest level of constant current in fast charge mode possible at any ambient temperature.

The AAT3783 also features over-voltage, over-current, short-circuit and over-temperature circuits that automatically protect the charging device, control system and battery-under-charge by shutting down the device if a fault occurs. A status monitor output pin is provided that can be used to indicate battery charge status by directly driving an external LED.

Qualified across a -40ºC to +85ºC temperature range, the AAT3783 is available in a Pb-free, 16-pin TDFN package. The price is $0.95 in 1000-piece quantities.

• www.analogictech.com

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