FBC4068AYDFN8G/TR

FBC4068A is a linear charger designed specifically for single-cell Li-Ion or Li-Polymer batteries. The chip integrates a power transistor, and the charge current can be set via an external resistor, with a maximum continuous charge current of up to 1000mA — no external blocking diode or current sense resistor is required. FBC4068A includes an open-drain status indicator pin to indicate charging in progress or charge completion. During charging, the CHRG pin outputs a low level to indicate that charging is in progress; upon charge completion, the CHRG pin transitions to a high-impedance state. The STDBY charge-complete status indicator pin is pulled low when charging ends, illuminating the charge-complete indicator LED, which remains off during the charging process. If the battery voltage falls below 2.9V, FBC4068A precharges the battery with a small current. When the battery voltage exceeds 2.9V, the device charges the battery in constant-current mode, with the charge current determined by resistor RPROG connected between the PROG pin and GND. As the battery voltage approaches 4.2V, the charge current gradually decreases and FBC4068A enters constant-voltage charging mode. The charge cycle terminates when the charge current decreases to the end-of-charge threshold, which is 20% of the constant-current charge current. When the battery voltage drops below the recharge threshold of 4.05V, FBC4068A automatically initiates a new charge cycle. The on-chip high-precision voltage reference, error amplifier, and resistor divider network ensure that the battery terminal regulation voltage accuracy is within 1%, meeting the requirements of Li-Ion and Li-Polymer batteries. When the input voltage falls below the UVLO threshold or drops below the battery voltage, the charger enters a low-power shutdown mode, during which the current consumed from the battery terminal is less than 2μA. The intelligent thermal control circuit inside FBC4068A automatically reduces the charge current when the junction temperature exceeds 135°C. This feature allows users to maximize the power handling capability of the chip without concern for damage to the chip or external components due to overheating. As a result, users do not need to design for worst-case conditions when setting the charge current — they can design based on typical conditions, since FBC4068A will automatically reduce the charge current under worst-case scenarios.

Applications

• Charging dock
• Bluetooth headsets, GPS
• Mobile phones, PDA, MP3/MP4
• Digital cameras, mini speakers, and other portable devices

Key features

• Maximum input voltage: 30V
• Full charge voltage: 4.2V
• Overvoltage protection voltage: 7.3V
• Maximum charge current: 1000mA
• Trickle/constant current/constant voltage three-stage charging
• No MOSFET, sense resistor, or isolation diode required
• Intelligent thermal regulation for maximum charge rate optimization
• Intelligent recharge function
• BAT input reverse polarity protection
• Standby mode quiescent current: 1.2μA
• C/5 charge termination
• 2.9V trickle charge threshold
• Charge status indication
• Package: DFN3×3 - 8L