BQ24123

• 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

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 V_CC supply is removed.