BQ24152

与 USB 完全兼容的完全集成开关模式单节锂离子充电器和 USB-OTG 支持

The bq24152 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 bq24152 integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.

The bq24152 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, bq24152 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 interface.

During the charging process, the bq24152 monitors its junction temperature TJ and reduces the charge current once TJ increases to approximately 125°C. To support USB OTG device, bq24152 provides VBUS approximately 5.05V by boosting the battery voltage. The bq24152 is available in 20-pin WCSP package.

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Charge Faster than Linear Chargers

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High-Accuracy Voltage and Current Regulation

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Input Current Regulation Accuracy: ±5% 100 mA and 500 mA

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Charge Voltage Regulation Accuracy: ±0.5% 25°C, ±1% 0°C-125°C

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Charge Current Regulation Accuracy: ±5%

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High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs

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20-V Absolute Maximum Input Voltage Rating

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6-V Maximum Operating Input Voltage

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Built-In Input Current Sensing and Limiting

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Integrated Power FETs for Up To 1.25-A Charge Rate

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Programmable Charge Parameters through I2C Interface up to 3.4 Mbps:

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Input Current

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Fast-Charge/Termination Current

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Charge Voltage 3.5 V to 4.44 V

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Safety Timer with Reset Control

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Termination Enable

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Synchronous Fixed-Frequency PWM Controller Operating at 3 MHz with 0% to 99.5% Duty Cycle

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Automatic High Impedance Mode for Low Power Consumption

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Robust Protection

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Reverse Leakage Protection Prevents Battery Drainage

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Thermal Regulation and Protection

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Input/Output Overvoltage Protection

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Status Output for Charging and Faults

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USB Friendly Boot-Up Sequence

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Automatic Charging

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Power Up System without Battery

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Boost Mode Operation for USB OTG:

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Input Voltage Range from Battery: 2.5 V to 4.5 V

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Output for VBUS: 5.05 V/ 200 mA

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2 x 2 mm 20-Pin WCSP Package

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APPLICA ONS

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Mobile and Smart Phones

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MP3 Players

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Handheld Devices