Description
The bqSWITCHER series are highly integrated Li-ion and Li-polymer switch-mode charge management devices targeted at a wide range of portable applications. The bqSWITCHER series offers integrated synchronous PWM controller and power FETs, high-accuracy current and voltage regulation, charge preconditioning, charge status, and charge termination, in a small, thermally enhanced QFN package. The system-controlled version provides additional inputs for full charge management under system control. The bqSWITCHER charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on user- selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. The bqSWITCHER automatically restarts the charge cycle if the battery voltage falls below an internal threshold. The bqSWITCHER automatically enters sleep mode when VCC supply is removed.
Two- or Three-Cell Li-Ion and Li-Polymer Battery Packs
(see Using bq24105 to Charge the LiFePO4 Battery)
Operating at 1.1 MHz With 0% to 100% Duty Cycle
and System-Controlled (Under System Command) Versions
Charge-In-Progress, Charge Completion, Fault, and AC-Adapter
Present Conditions
- Handheld Products
- Portable Media Players
- Industrial and Medical Equipment
- Portable Equipment
