New Industry Products

AnalogicTech Intros AAT3687 BatteryManager IC

August 29, 2005 by Jeff Shepard

Advanced Analogic Technologies Inc. (AnalogicTech, Sunnyvale, CA), a developer of power management solutions, introduced a new highly integrated, single-cell, lithium-ion/polymer battery charger IC, the AAT3687 BatteryManager, that brings together a charging device, a reverse blocking diode, and a current sensing circuit in a small 3 mm x 3 mm TDFN package. The AAT3687 BatteryManager reduces component count in a wide range of portable, battery-powered consumer applications, and features an active thermal management system that regulates fast charge while maintaining a constant current for all ambient temperatures and input-/output-voltage conditions.

By integrating primary charging functions into a single compact package, and requiring a minimum number of external components, the AAT3687 helps free up valuable board space. The battery charger supports charging currents up to 1.5 A across an input-voltage range of 4.0 V to 5.5 V. An active thermal loop charge-reduction circuit reduces charging time by allowing the charger to operate at whatever rate is accessible up to 1.5 A. If the charging rate exceeds thermal restrictions, the function automatically adjusts the charger to a lower current, rather than turning the charger off, until sufficient heat is dissipated. Multiple built-in intelligent functions maximise charging efficiency and protect the integrity of the charging device, the control system, and the battery under charge. The device constantly monitors battery temperature and charge state to detect fault conditions. If an over-voltage or over-temperature failure occurs, the AAT3687 automatically shuts down. The device can also report up to 12 different charging status states to a microcontroller through an embedded serial interface. Sleep mode current is low (2 µA typical), extending system standby time.

The new AAT3687 comes in a lead-free, thermally enhanced, 12-pin, 3 mm x 3 mm TDFN package, and is rated over the -40 °C to +85 °C range. Samples of the AAT3687 are now available.