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1-A Single-Chip Li-Ion & Li-Pol Charger



Texas Instruments  BQ24081EVM

The BQ24081EVM Evaluation Module is designed to for engineering evaluation of the bq24081, which is a highly integrated and flexible Li-Ion linear charge device targeted at space-limited charger applications. The bq24081 offers an integrated power FET and current sensor, high-accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device.

An external resistor sets the magnitude of the charge current. The bq24081 charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The bq24081 automatically restarts the charge if the battery voltage falls below an internal threshold. The bq24081 automatically enters sleep mode when the input supply is removed. A complete designed and tested charger is presented in the BQ24081EVM.

The BQ24081EVM is designed to deliver up to 1 A of continuous charge current for single–cell Li-Ion or Li-Pol applications using a dc power supply. The charger EVM is programmed from the factory to deliver 0.7 A of charging current.