AW3215

The AW3215 supports multiple charging protocols to enable fast charging from various power sources: USB BC1.2 (Battery Charging Specification 1.2) for standard USB charging up to 1.5A. Quick Charge 2.0/3.0 for high-voltage charging from compatible adapters. USB Power Delivery (PD) for negotiation of optimal voltage and current. The device automatically detects the connected adapter type and configures the optimal charging parameters. For dedicated chargers, the AW3215 can accept input voltages up to 13.5V, enabling high-power charging without excessive current. The I2C interface allows software to override automatic detection and manually configure charging parameters when needed. The charger includes a D+/D- detection circuit for adapter type identification and supports USB On-The-Go (OTG) mode for powering external devices from the battery.

AW3215 supports major fast charging protocols. Compatible with most USB adapters and dedicated chargers.

The AW3215 charging parameters are configured through the I2C interface by writing to specific control registers. Key configurable parameters include: Charge current - programmable from 100mA to 3A in steps. Charge voltage - programmable to match your battery chemistry (typically 4.2V for Li-ion). Safety timer - configurable timeout for charge termination. Input current limit - sets maximum current drawn from the input source. The configuration process involves: Initializing the I2C interface and verifying communication by reading the device ID register. Writing to the charge control register to set charge current and voltage. Enabling the charger and monitoring status registers for charging progress. Reading fault registers to detect any issues during charging. Awinic provides a software driver with API functions for common operations. The I2C interface supports standard (100kHz) and fast (400kHz) modes. Our FAE team can provide example code and configuration guidance.

Use Awinic provided software drivers for I2C configuration. Contact our FAE team for programming support.

The AW3215 achieves excellent efficiency due to its synchronous buck topology. Typical efficiency is >90% at 2A charging current from a 5V input, and >85% at 3A maximum current. The efficiency varies with input voltage, output current, and battery voltage: Higher input voltage relative to battery voltage improves efficiency. Mid-range charge currents (1-2A) typically show peak efficiency. As the battery approaches full charge, efficiency decreases because the voltage differential reduces. The synchronous rectification (using a low-side MOSFET instead of a diode) significantly improves efficiency compared to non-synchronous designs. This high efficiency means less heat generation, allowing sustained fast charging without thermal throttling. For a typical smartphone charging scenario (3.7V battery, 5V input, 2A current), the AW3215 dissipates less than 1W of power as heat, enabling compact designs without extensive thermal management.

Expect >90% efficiency at typical operating points. High efficiency enables compact fast charging designs.

The AW3215 includes comprehensive battery protection features to ensure safe charging: Over-voltage protection (OVP) monitors battery voltage and stops charging if it exceeds the programmed threshold (typically 4.25V). Under-voltage protection prevents charging of deeply discharged batteries until they reach a safe voltage. Over-current protection limits charge current to programmed levels and responds to fault conditions. Temperature protection uses an external NTC thermistor to monitor battery temperature, suspending charging if temperature exceeds safe limits (typically 0°C to 45°C for charging). Safety timer terminates charging if the process takes longer than expected, preventing indefinite charging of faulty batteries. Short-circuit protection detects output shorts and limits current. These protections work together to prevent battery damage, thermal runaway, and safety hazards. All protection events are reported via status registers accessible through the I2C interface.

Comprehensive protection is automatic. Connect NTC thermistor for temperature protection.

The AW3215 requires minimal external components for a complete charging solution: Input capacitor - 10uF ceramic capacitor close to the input pins for filtering and stability. Output capacitor - 10uF ceramic capacitor at the battery connection for output filtering. Inductor - 2.2uH power inductor rated for peak charging current. Sense resistor - current sense resistor for charge current programming and monitoring. NTC thermistor - 10kohm NTC for battery temperature monitoring (optional but recommended). Pull-up resistors - 4.7kohm resistors for I2C lines. The inductor selection is critical - choose an inductor with saturation current rating above the maximum charge current and low DC resistance for best efficiency. The input capacitor should be placed as close as possible to the IC pins. Awinic provides a reference design with recommended component values and part numbers. The total BOM cost is competitive due to the high integration of the AW3215.

Minimal external components needed. Use recommended values from reference design.

Yes, the AW3215 supports USB On-The-Go (OTG) mode, allowing the device to power external USB accessories from the battery. In OTG mode, the AW3215 operates in boost configuration, stepping up the battery voltage (typically 3.0V-4.2V) to 5V at the USB connector. The OTG output can deliver up to 1A current to power external devices like USB drives, keyboards, or other accessories. The mode is enabled via the I2C interface by setting the OTG control bit. When OTG is enabled, charging is suspended and the device switches to boost mode. Protection features in OTG mode include: Output over-current protection to prevent damage from excessive load. Output short-circuit protection. Input under-voltage protection to prevent deep battery discharge. The OTG function is useful for smartphones and tablets that need to host USB devices. The boost converter uses synchronous rectification for high efficiency, minimizing battery drain during OTG operation.

OTG mode enables USB host functionality. Enable via I2C when needed.