TI BQ24251RGET

The bq24251 and bq24253 are highly integrated single-cell lithium-ion battery chargers and system power path management devices, suitable for space-constrained portable applications using high-capacity batteries. The single-cell battery charger has a single input powered by a USB port or an AC wall adapter to provide a multi-purpose solution.

• High-efficiency switch-mode charger with independent power path, enabling system startup from deeply discharged battery or in the absence of a battery
• USB charging compatible with selectable input current limits: 100mA, 500mA, 900mA, 1.5A, and 2A
• BC1.2-compatible D+/D– detection in host mode (after I²C communication begins, before watchdog timer timeout)
• 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: ICHG up to 2A with current monitor output (ISET), ILIM up to 2A with current monitor output (ILIM), VIN_DPM (VDPM)
• Watchdog timer disable bit
• Integrated 4.9V, 50mA LDO
• Comprehensive system-level protection: input UVLO, input OVP, battery OVP, sleep mode, VIN_DPM, input current limiting, charge current limiting, thermal regulation, thermal shutdown, JEITA-compliant voltage-based NTC monitor input, safety timer
• 22V absolute maximum input voltage rating
• 10.5V maximum operating input voltage
• Low RDS(on) integrated power FET supporting up to 2A charge rate
• Open-drain status output
• Synchronous fixed-frequency PWM controller at 3MHz operating frequency, supporting compact inductors
• AnyBoot reliable battery detection algorithm
• Charge time optimizer for reducing charge time at any given charge current
• 2.40mm×2.00mm 30-ball DSBGA and 4mm×4mm 24-pin QFN packages

• Mobile phones and smartphones
• MP3 players
• Portable media players
• Handheld devices