The bqSWITCHER series are highly integrated Li-ion and Li-polymer switched-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 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.
Feature
- Enhanced EMI Performance
- Integrated Power FETs For Up To 2-A Charge
Rate - Suitable For 1-, 2-, or 3-Cell Li-Ion and Li-Polymer
Battery Packs - Synchronous Fixed-Frequency PWM Controller
Operating at 1.1 MHz With 0% to 100% Duty
Cycle - High-Accuracy Voltage and Current Regulation
- Status Outputs For LED or Host Processor
Interface Indicates Charge-In-Progress, Charge
Completion, Fault, and AC-Adapter Present
Conditions - 20-V Absolute Maximum Voltage Rating on IN and
OUT Pins - Accurate High-Side Battery Current Sensing
- Battery Temperature Monitoring
- Automatic Sleep Mode for Low Power
Consumption - Reverse Leakage Protection Prevents Battery
Drainage - Thermal Shutdown and Protection
- Built-In Battery Detection
- Available in 20-pin 3.5-mm × 4.5-mm VQFN
Package
