Product category:
Power Supply ICs and Controllers
News Release from: Advanced Analogic Technologies | Subject: AAT368x family
Edited by the Electronicstalk Editorial
Team on 16 July 2007
Charger chips have all Li-ion options
covered
USB/AC battery charger ICs save space in portable systems operating off single-cell 4.2V lithium-ion/polymer batteries.
AnalogicTech has introduced 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 one external component, the new devices offer a complete USB/AC charging function in packages as small as 2.0 x 2.1mm
This article was originally published on Electronicstalk on 16 Jun 2004 at 8.00am (UK)
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This highly integrated, single input USB/AC charger 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 that 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 minimise 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 that 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 precondition as a standard feature.
The optional AAT3684-1 version comes without the trickle charge capability.
The AAT3681A is a derivative of the AAT3681 that was announced by AnalogicTech last year.
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 2.1mm 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 overtemperature protection.
The AAT3683 adds overcurrent protection.
All three devices are specified across the -40 to +85C temperature range.
The AAT3681A is available in a Pb-free, 8-pin, 2 x 2.1mm SC70JW package.
The AAT3683 is available in Pb-free, 10-pin 2.2 x 2.2mm STDFN and 16-pin QFN-33 packages.
The AAT3684 is available in a 10-pin 2.2 x 2.2mm STDFN package.
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