Lithium Battery-Charger IC Integrates FETs To Drive 2 A For Fast Charging

Aug. 23, 2004
Consumers not only want long battery life, they also want to charge their batteries in next to no time. So, here is a synchronous, switch-mode battery-charger IC to fill the bill. The bq24100 from Texas Instruments includes power FETs...

Consumers not only want long battery life, they also want to charge their batteries in next to no time. So, here is a synchronous, switch-mode battery-charger IC to fill the bill.

The bq24100 from Texas Instruments includes power FETs that can source 2 A of charge current to one-, two-, and three-series cell lithium-ion (Li-ion) or lithium-polymer (Li-poly) battery packs for DVD/media players and smart handhelds. It provides precise regulation plus charge status outputs. It also terminates charging when the battery is full or a timer expires.

This chip works strictly with Li-ion or Li-poly batteries, which it charges in three phases: conditioning, for deeply discharged batteries; constant-current fast-charge; and constant-voltage. Also, the chip terminates charge when it detects a pre-set current level. If the battery voltage falls below a threshold, the chip automatically re-starts. If the external charging supply is removed, the battery won't discharge through the chip. For special cases, another version of the chip can run an MCU-programmed charge profile.

All of this functionality squeezes into a 3.5- by 4.5-mm QFN package. The bq24100 operates from 3.5 to 16 V. It switches at 1.1 MHz. Pricing is $2.10 each in thousand-unit lots. Application notes and a reference design are available

Texas Instruments Inc.www.ti.com

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