BQ24105RHLR

The bqSWITCHER™ series is a highly integrated Li-ion and Li-polymer switching mode charge management device suitable for a wide range of portable applications. The bqSWITCHER™ series offers an integrated synchronous PWM controller and power FETs, high-precision current and voltage regulation, pre-charge, charge status monitoring, and charge termination functions, and is available in a small, thermally enhanced VQFN package. The system-controlled version provides additional inputs for complete charge management under system control. The bqSWITCHER™ charges the battery in three phases: pre-charge, constant current, and constant voltage. Charging terminates based on a user-selectable minimum current level. A programmable charge timer provides a safety backup for charge termination. If the battery voltage drops below an internal threshold, the bqSWITCHER™ automatically restarts the charge cycle. When the VCC power supply is removed, the bqSWITCHER™ automatically enters sleep mode.

Applications

• Handheld products
• Portable media players
• Industrial and medical equipment
• Portable devices

Key features

• High-efficiency charger design for 1-cell, 2-cell, or 3-cell Li-Ion and Li-Polymer battery packs; bq24105 also supports LiFePO4 batteries (see Charging LiFePO4 Batteries with bq24105)
• Integrated synchronous fixed-frequency PWM controller operating at 1.1 MHz, with duty cycle range from 0% to 100%
• Integrated power FETs supporting charge rates up to 2A
• High-accuracy voltage and current regulation
• Available in standalone version (with built-in charge management and control) and system control version (operating under system commands)
• Status outputs for LED or host processor interface, indicating charge-in-progress, charge complete, fault, and AC adapter present
• Maximum voltage rating of 20V on IN and OUT pins
• High-side battery current sensing
• Battery temperature monitoring
• Automatic sleep mode for reduced power consumption
• System control version suitable for NiMH and NiCd applications
• Reverse leakage protection against battery discharge
• Thermal shutdown and protection
• Integrated battery detection
• 20-pin, 3.50mm×4.50mm VGFN package