FAN54511: 3.2 A Dual Input, Switch Mode Charger with Power Path

The FAN5451x family of chargers includes an I2C controlled 3.2 A USB-compliant switch-mode charger.

To facilitate fast system startup, the IC includes an optimized Power Path circuit which also accurately measures battery currents during charging and provides low impedance during discharge.

The charging parameters and operating modes are programmable through an I2C Interface. Charge status is reported back to the host through the I2C port and the /STAT pin.

The FAN5451x provides battery charging in three modes: Pre-Charge (IPP), Constant Current (CC) and Constant Voltage (CV). The charger can automatically restart the charge cycle when the battery falls below a restart voltage threshold. If the input source is removed, the IC enters a high-impedance mode, blocking battery current from leaking to either input.

The FAN5451x is available in a 63-bump, 0.4 mm pitch WLCSP package.

Features

• Fully Integrated, High-Efficiency Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
• Power Path Circuit ensures Fast System Startup with a Dead Battery
• 95% Charge Efficiency
• Charge Current Programmable up to 3.2 A
• 10 mV Float Voltage Accuracy
• ±5% Charge Current Regulation Accuracy
• 5 V, 1.5 A Boost Mode for USB OTG
• 22 V DC Withstand Voltage on VBUS
• 13.25 V Maximum Input Operating Voltage
• -2 V Input Reverse Polarity Protection