BQ24166RGET

The bq24165, bq24166, and bq24167 are highly integrated single-cell lithium-ion battery chargers and system power path management devices designed for portable applications with limited space and high-capacity batteries. The single-cell charger features dual inputs, enabling multi-use solutions with a USB port or a higher-power input source (such as an AC adapter or wireless charging input). The two inputs are independent of each other and are managed by the bq24165/166/167 using the prioritized IN input. The power path management feature allows the bq24165/166/167 to power the system from an efficient DC-to-DC converter while charging the battery independently. The charger monitors the battery current and reduces the charging current when the current required by the system load exceeds the input current limit, ensuring proper charge termination and timer operation. The system voltage is regulated to the battery voltage but not less than 3.5V. The minimum system voltage support enables the system to operate with a defective or missing battery pack and allows instant system startup when the battery is fully discharged or absent. When the adapter cannot deliver the peak system current, the power path management architecture allows the battery to supplement the system current demand, enabling the use of a smaller adapter. The 2.5A input current capability allows GSM phone calls to be made immediately upon adapter insertion, regardless of the battery voltage. Battery charging goes through three stages: regulation, constant current, and constant voltage. An internal control loop monitors the IC junction temperature and reduces the charging current if the internal temperature threshold is exceeded. The bq24166 and bq24167 provide a voltage-based battery pack thermistor monitoring input (TS) to monitor the battery temperature for safe charging. The TS function of the bq24166 is JEITA-compliant.

Applications

• Handheld products
• Portable media players
• Portable devices
• Netbooks and portable internet devices

Key features

• High-efficiency switch-mode charger with independent power path control for GSM calls using deeply discharged or absent battery, and fast system startup from deeply discharged or absent battery
• Dual-input charger rated at 20V input with OVP; USB input up to 6.5V, IN input up to 10.5V
• Integrated FETs support charge rates up to 2.5A; IN input up to 2.5A, USB input up to 1.5A
• Highly integrated battery N-channel MOSFET controller for power path management
• Safe and accurate battery management: 0.5% battery regulation accuracy, ±10% charge current accuracy, adjustable charge current, input current limit, and VINDPM threshold (for IN input)
• Simplified JEITA implementation with charge parameter selector inputs (CE1, CE2) for bq24165
• Voltage-based NTC monitoring input (TS): standard temperature range (bq24166), JEITA compliant (bq24167)
• Thermal regulation protection for output current control
• Low battery leakage current, BAT short-circuit protection
• Soft-start feature reduces inrush current
• Thermal shutdown and protection
• Available in compact 2.8mm × 2.8mm 49-ball WCSP or 4mm × 4mm QFN package