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BQ24185 Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and Accessory Power Connection TI
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The bq24185 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 is programmable using an I2C compatible interface. The bq24185 integrates a synchronous PWM controller, power MOSFETs, input current sensing and overvoltage protection, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The bq24185 charges the battery in three phases: conditioning, constant current and constant voltage. Charge current is programmable using the I2C interface. Additionally, the input current can be limited to a host programmable threshold to maintain maximum charge current from current-limited sources, such as USB ports. Charge is terminated based on user-selectable minimum current level. A software watchdog provides a safety backup for I2C interface while a safety timer prevents overcharging the battery. During normal operation, bq24185 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 bq24185 monitors its junction temperature (TJ) and reduces the charge current if TJ increases to 125°C. To support USB OTG peripherals, the bq24185 contains boost circuitry that supplies VVBUS at 5.05V at up to 300mA by boosting the battery voltage. The bq24185 is available in 25-pin WCSP package.

• Charge Faster than Linear Chargers From
   Current Limited Input Sources
• High-Accuracy Voltage and Current Regulation
   – Input Current Regulation Accuracy: ±5%
      (100mA, 500mA)
   – Charge Voltage Regulation Accuracy:
      ±0.5% (25°C), ±1% (0 – 125°C)
   – Charge Current Regulation Accuracy: ±5%
• 300mA, 5V Boost Mode for USB OTG Support
• Accessory Power Output (DCOUT)
• Input Voltage Based Dynamic Power
• Safety Limit Register for Maximum Charge
   Voltage and Current Limiting
• High-Efficiency Mini-USB/AC Battery Charger
   for Single-Cell Li-Ion and Li-Polymer Battery
• 20V Absolute Maximum and 16.5V Operation
   Input Voltage Rating
• Built-in Input Current Sensing and Limiting
• Integrated Power FETs for Up to 1.5A Charge
• Programmable Charge Parameters through
   I2C™ compatible Interface (up to 3.4 Mbps)
• Synchronous Fixed-Frequency PWM
   Controller Operating at 3 MHz With 0% to
   99.5% Duty Cycle
• Safety Timer and Software Watchdog
• Reverse Leakage Protection Prevents Battery
• Thermal Regulation and Protection
• Status Outputs for Charging and Faults
• 25-Pin WCSP Package

• Mobile Phones and Smart Phones
• Portable Media Players
• Handheld Devices

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BQ24185 有关数据资料列表

RT9503A Fully Integrated Linear Single Cell Li-Ion Battery Charger with Power Path RT9503A View Richtek Technology
RT9503 Fully Integrated Linear Single Cell Li-Ion Battery Charger with Power Path RT9503 View Richtek Technology
FAN54013BUCX USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator FAN54013BUCX View Fairchild Semiconductor
L6924D Battery charger system with integrated power switch for Li-ION/Li-POLYMER L6924D View STMicroelectronics
FAN5400 USB-Compliant Single-Cell Li-Ion Switching Charger with USB-OTG Boost Regulator FAN5400 View Fairchild Semiconductor
L6924U USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer L6924U View STMicroelectronics
SMB138 Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge™ Mode and USB “On- the-Go” Power SMB138 View Summit Microelectronics
MCP73811 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers MCP73811 View Microchip Technology
MAX8903A 2A 1-Cell Li+ DC-DC Charger for USB* and Adapter Power MAX8903A View Maxim Integrated
RT9525 Linear Single Cell Li-Ion Battery Charger with Auto Power Path RT9525 View Richtek Technology

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