AnalogicTech Announces Family of Compact USB/AC Battery Charger ICs
Advanced Analogic Technologies Inc. announced a comprehensive line of USB/AC battery charger ICs for portable systems operating off single-cell 4.2V (4.375V) Lithium Ion/Polymer batteries. Integrating a wide array of features into a compact footprint and requiring just a single external component, these new devices are said to offer complete USB/AC charging function in packages as small as 2.0 x 2.1 mm.
The AAT3683 supports programmable charge currents up to 1A. Operating off a voltage input range of 4.0 to 6.5V, the AAT3683 integrates a charging device, reverse blocking diode and current sensing to regulate battery charge voltage and current for 4.2V (4.375V) Li-ion/polymer battery cells. The battery charger IC includes a digital thermal regulation circuit developed and patented by AnalogicTech which automatically reduces the charging current when the internal temperature of the die exceeds a preset limit to prevent the device from thermal shutdown. This feature helps minimize charge time by maintaining the maximum possible battery charging current for a given set of input to output, power dissipation and ambient temperature conditions. The AAT3683 also adds an integrated charge timer which automatically terminates charging functions if a defective battery cell does not accept a charge over a preset period of time.
The AAT3684 is a single-input USB/AC adapter charger with charge current programmable from 15 to 500mA. The device offers automatic trickle charge for battery pre-condition as a standard feature. The optional AAT3684-1 version comes without the trickle charge capability. Designed for space-constrained, portable applications requiring up to 500mA from either a USB or ac source, the AAT3681A comes in a highly compact 2.0 x 2.1 mm SC70JW package. Unlike its predecessor, this battery charger IC is also available with a variety of trickle charge, active enable high and low, and charge termination threshold current options. Each of the new charger ICs offer overvoltage, short-circuit and over temperature protection. The AAT3683 adds over-current protection.
All three devices are specified across the -40 to +85°C temperature range. The AAT3681A is available in a Pb-free, 8-pin, 2 x 2.1 mm SC70JW package and sells for $0.81 in 1,000 piece quantities. The AAT3683 is available in Pb-free, 10-pin 2.2 x 2.2 mm STDFN and 16-pin QFN-33 packages. It sells for $0.98 in 1,000 piece quantities. The AAT3684 is available in a 10-pin 2.2 x 2.2 mm STDFN package and costs $0.92 in 1,000 piece quantities.
