Catalog
I2C 1cell 1.25A Buck battery charger
Key Features
• Charge Faster than Linear ChargersHigh-Accuracy Voltage and Current RegulationInput Current Regulation Accuracy: ±5% (100 mA and 500 mA)Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C-125°C)Charge Current Regulation Accuracy: ±5%High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs20-V Absolute Maximum Input Voltage Rating6-V Maximum Operating Input VoltageBuilt-In Input Current Sensing and LimitingIntegrated Power FETs for Up To 1.25-A Charge RateProgrammable Charge Parameters through I2C Compatible Interface (up to 3.4 Mbps):Input CurrentFast-Charge/Termination CurrentCharge Voltage (3.5 V to 4.44 V)Safety Timer with Reset ControlTermination EnableSynchronous Fixed-Frequency PWM Controller Operating at 3 MHz with 0% to 99.5% Duty CycleAutomatic High Impedance Mode for Low Power ConsumptionRobust ProtectionReverse Leakage Protection Prevents Battery DrainageThermal Regulation and ProtectionInput/Output Overvoltage ProtectionStatus Output for Charging and FaultsUSB Friendly Boot-Up SequenceAutomatic ChargingPower Up System without Battery3.5 mm x 3.5 mm 14-Pin QFN PackageAPPLICATIONSMobile and Smart PhonesMP3 PlayersHandheld DevicesCharge Faster than Linear ChargersHigh-Accuracy Voltage and Current RegulationInput Current Regulation Accuracy: ±5% (100 mA and 500 mA)Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C-125°C)Charge Current Regulation Accuracy: ±5%High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs20-V Absolute Maximum Input Voltage Rating6-V Maximum Operating Input VoltageBuilt-In Input Current Sensing and LimitingIntegrated Power FETs for Up To 1.25-A Charge RateProgrammable Charge Parameters through I2C Compatible Interface (up to 3.4 Mbps):Input CurrentFast-Charge/Termination CurrentCharge Voltage (3.5 V to 4.44 V)Safety Timer with Reset ControlTermination EnableSynchronous Fixed-Frequency PWM Controller Operating at 3 MHz with 0% to 99.5% Duty CycleAutomatic High Impedance Mode for Low Power ConsumptionRobust ProtectionReverse Leakage Protection Prevents Battery DrainageThermal Regulation and ProtectionInput/Output Overvoltage ProtectionStatus Output for Charging and FaultsUSB Friendly Boot-Up SequenceAutomatic ChargingPower Up System without Battery3.5 mm x 3.5 mm 14-Pin QFN PackageAPPLICATIONSMobile and Smart PhonesMP3 PlayersHandheld Devices
Description
AI
The bq24155 is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The bq24155 integrates a synchronous PWM controller, power FETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The bq24155 charges the battery in three phases: conditioning, constant current and constant voltage. The input current is automatically limited to the value set by the host. Charge is terminated based on user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface. During normal operation, bq24155 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status is reported to the host using the I2C compatible interface.
During the charging process, the bq24155 monitors its junction temperature (TJ) and reduces the charge current once TJincreases to approximately 125°C. The bq24155 is available in 14-pin QFN package.
The bq24155 is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The bq24155 integrates a synchronous PWM controller, power FETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The bq24155 charges the battery in three phases: conditioning, constant current and constant voltage. The input current is automatically limited to the value set by the host. Charge is terminated based on user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface. During normal operation, bq24155 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status is reported to the host using the I2C compatible interface.
During the charging process, the bq24155 monitors its junction temperature (TJ) and reduces the charge current once TJincreases to approximately 125°C. The bq24155 is available in 14-pin QFN package.
