Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: bq24100
Edited by the Electronicstalk Editorial Team on 14 July 2004
Battery chip charges faster and cooler
The bq24100 is billed as the first synchronous, switch-mode battery charge IC with internal power FETs capable of supplying up to 2A of charge current
Solving the design challenge to efficiently deliver higher battery charge current in small portable applications, Texas Instruments has released the first synchronous, switch-mode battery charge integrated circuit (IC) with internal power FETs capable of supplying up to 2A of charge current.
This article was originally published on Electronicstalk on 14 July 2004 at 8.00am (UK)
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The new battery management IC enables higher charge current while reducing the amount of heat generated, making it ideal for use in systems that incorporate one, two and three series cell lithium-ion (Li-ion) or lithium-polymer (Li-poly) battery packs, such as portable DVD and media players, smart handhelds, medical, industrial and other portable equipment.
TI's bq24100 battery charge IC, which comes in a small 3.5 x 4.5mm QFN package, operates at a fixed frequency of 1.1MHz from an input voltage up to 16V.
The new IC delivers high accuracy current and voltage regulation for precise battery charging, multiple charge status outputs for charge progress indication and automatic battery full charge detection and charge termination.
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Providing safe and reliable charging of Li-ion or Li-polymer batteries, the bq24100 device charges in three phases: a low current conditioning phase for deeply discharged batteries, a fast charge constant current phase delivering up to 2A and a constant voltage phase.
In this final phase, the device terminates charge based on a minimum current level.
A programmable charge timer provides a safety backup for termination.
Separate versions of the IC also allow the portable system's microcontroller to control the battery charging profile and termination with digital inputs to the IC.
The bq24100 automatically restarts the charge if the battery voltage falls below a specific threshold.
As with other TI battery charge management devices, including the popular bqTiny family of linear control charge ICs, the new bq24100 integrates reverse-blocking protection to prevent battery drainage through the IC in the absence of the input charging supply.
The bq24100 is currently shipping in volume from TI and its authorised distributors, and is available in a 20-pin, 3.5 x 4.5mm QFN package.
Suggested resale price for the charge IC is $2.10 each per 1000 units.
A bq24100 evaluation module, application notes, technical documentation and TI's battery management Sine On selection guide are also available.
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