Battery power

Texas Instruments has developed a synchronous, switch-mode battery charge integrated circuit 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 developed a synchronous, switch-mode battery charge integrated circuit (IC) with internal power FETs capable of supplying up to 2A of charge current.

It is suitable 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 mm x 4.5 mm QFN package, operates at a fixed frequency of 1.1MHz from an input voltage up to 16 V. It 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.

The bq24100 device charges Li-Ion or Li-Polymer batteries 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 a portable system’s micro-controller to control the battery charging profile and termination with digital inputs to the IC. The bq24100 automatically re-starts the charge if the battery voltage falls below a specific threshold.

As with other TI battery charge management devices, including the bqTINY family of linear control charge ICs, the bq24100 integrates reverse-blocking protection to prevent battery drainage through the IC in the absence of the input charging supply.

The IC is currently shipping in volume from TI and its authorized distributors, and is available in a 20-pin, 3.5 mm x 4.5 mm QFN package. Suggested resale price is $2.10 each per 1,000 units.

A bq24100 evaluation module, application notes, technical documentation and TI’s Power Management selection guide are available