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Analogic Technologies, a developer of power management semiconductors for mobile consumer electronic devices, announced today 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 highly compact footprint and requiring just a single external component, these new devices offer complete USB/AC charging function in packages as small as 2.0 x 2.1 mm.

• AAT3683-  offers the most comprehensive feature set in the new product family. This highly integrated, single input USB/AC charger supports programmable charge currents up to 1A. Operating off a voltage input range of 4.0V 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.
• AAT3684 – a single-input USB/AC adapter charger with charge current programmable from 15 mA to 500 mA. 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.
• AAT3681A - a derivative of the AAT3681 previously announced by AnalogicTech in April, 2006. Designed for space-constrained, portable applications requiring up to 500 mA 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.

For more information visit AnalogicTech

Source : AnalogicTech press release

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