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  • TD9157

  • TD9157 Fully Integrated Switch-Mode ChargerWith USB Compliance and USB-OTG Support

    (DATASHEET)


    The TD9157 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 IC 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 IC 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 battery voltage and user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface. During normal operation, The IC 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 can be reported to the host using the I2C interface. During the charging process, the IC monitors its junction temperature (TJ) and reduces the charge current once TJ increases to about 125°C. To support USB OTG device, TD9157 can provide VBUS (5.05V) by boosting the battery voltage. The IC is available in 20-pin WCSP package.


     

    Features

    Charge Faster than Linear Chargers

    High-Accuracy Voltage and Current Regulation

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

    -Charge Voltage Regulation Accuracy:

    -±0.5% (25°C), ±1% (0°C to 125°C)

    -Charge Current Regulation Accuracy: ±5%

    Input Voltage Based Dynamic Power Management (VIN DPM)

    Bad Adaptor Detection and Rejection

    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  Packs

    20-V Absolute Maximum Input Voltage Rating

    6.5-V Maximum Operating Input Voltage

    Built-In Input Current Sensing and Limiting

    Integrated Power FETs for Up To 1.25-A Charge Rate

    Programmable Charge Parameters through I2C™ -Compatible Interface (up to 3.4 Mbps):

    -Input Current Limit

    -VIN DPM Threshold

    -Fast-Charge/Termination Current

    -Charge Regulation Voltage (3.5 V to 4.44 V)

    -Low Charge Current Mode Enable/Disable

    -Termination Enable/Disable

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

    Automatic High Impedance Mode for Low Power Consumption

    Robust Protection

    -Reverse Leakage Protection Prevents Battery Drainage

    -Thermal Regulation and Protection

    -Input/Output Overvoltage Protection

    Status Output for Charging and Faults

    USB Friendly Boot-Up Sequence

    Automatic Charging

    Boost Mode Operation for USB OTG

    -Input Voltage Range (from Battery): 3.2 V to 4.5V

    2.1 mm x 2 mm 20-Pin WCSP Package

    Applications

    Mobile and Smart Phones
    M3 Players
    Handheld Devices

 
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