1 Features
• High-Efficiency Switched-Mode Charger With
Separate Power Path
• Startup System From Deeply Discharged or
Missing Battery
• USB Charging Compliant
– Selectable Input Current Limit of 100 mA,
500 mA, 900 mA, 1.5 A, and 2 A
• BC1.2 Compatible D+, D– Detection
• In Host Mode (After I2C Communication Starts
and Before Watchdog Timer Times Out)
– Programmable Battery Charge Voltage,
VBATREG
– Programmable Charge Current (ICHG)
– Programmable Input Current Limit (ILIM)
– Programmable Input Voltage-Based Dynamic
Power Management Threshold, (VIN_DPM)
– Programmable Input Overvoltage Protection
Threshold (VOVP)
– Programmable Safety Timer
• Resistor Programmable Defaults for:
– I CHG up to 2 A With Current Monitoring Output
(ISET)
– ILIM up to 2 A With Current Monitoring Output
(ILIM)
– VIN_DPM (VDPM)
• Watchdog Timer Disable Bit
• Integrated 4.9 V, 50 mA LDO
• Complete System-Level Protection
– Input UVLO, Input Overvoltage Protection
(OVP), Battery OVP, Sleep Mode, VIN_DPM
– Input Current Limit
– Charge Current Limit
– Thermal Regulation
– Thermal Shutdown
– Voltage-Based, JEITA Compatible NTC
Monitoring Input
– Safety Timer
• 22 V Absolute Maximum Input Voltage Rating
• 10.5 V Maximum Operating Input Voltage
• Low RDS(on) Integrated Power FETs for a Charging
Rate of up to 2 A
• Open-Drain Status Outputs
• Synchronous Fixed-Frequency PWM Controller
Operating at 3 MHz for Small Inductor Support
• AnyBoot Robust Battery Detection Algorithm
• Charge Time Optimizer for Improved Charge
Times at Any Given Charge Current
• 2.40-mm x 2.00-mm 30-Ball DSBGA and 4-mm x
4-mm 24-Pin QFN Packages

2 Applications
• Mobile Phones and Smart Phones
• MP3 Players
• Portable Media Players
• Handheld Devices

3 Description
The bq24250, bq24251, and bq24253 are highly
integrated single-cell Li-Ion battery chargers and system power-path management devices targeted for
space-limited, portable applications with high-capacity
batteries. The single-cell charger has a single input
that operates from either a USB port or an AC wall
adapter for a versatile solution.