• 600-kHz NMOS-NMOS Synchronous buck converter

• Stand-alone charger support for li-ion or li-polymer

• 5-V to 28-V VCC Input operating range and supports 1- to 6-battery cells(BQ24610)

• 5-V to 24-V VCC Input operating range and supports 1- to 5-battery cells(BQ24617)

• Up to 10-A charge current and adapter current

• High-accuracy voltage and current regulation

• ±0.5% Charge voltage accuracy

• ±3% Charge current accuracy

• ±3% Adapter current accuracy

• Integration

• Automatic system power selection from adapter orbattery

• Non Power Path option for low total BOM cost

• Internal loop compensation and soft start

• Dynamic power management

• Safety protection

• Input overvoltage protection

• Battery thermistor sense hot and cold charge suspend

• Battery detection

• Reverse protection input FET

• Programmable safety timer

• Charge overcurrent protection

• Battery short protection

• Battery overvoltage protection

• Thermal shutdown

• Status Outputs

• Adapter present

• Charger operation status

• Charge enable pin

• 6-V Gate drive for synchronous buck converter

• Energy star low quiescent current Iq

• < 15-μA Off-state battery discharge current

• < 1.5-mA Off-state input quiescent current

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The BQ2461x is a highly integrated Li-ion, Li-polymer or Lead-acid switched-mode batterycharge controller. The device offers a constant-frequency synchronous switching PWM controller withhigh-accuracy charge current and voltage regulation, charge preconditioning, termination, adaptercurrent regulation, and charge status monitoring.

The BQ2461x charges the battery in three phases: preconditioning, constant current, andconstant voltage.

Charge is terminated when the current reaches a minimum user-selectable level. Aprogrammable charge timer provides a safety backup. The BQ2461x automatically restarts the chargecycle if the battery voltage falls below an internal threshold, and enters a low quiescent currentsleep mode when the input voltage falls below the battery voltage.