FP6908ASP

The FP6908 is an integrated charger IC for single-cell Li-ion/Li-polymer batteries. The FP6908 functions as a traditional linear charger when powered with a voltage source adapter. When powered with a current-limited adapter, the charger minimizes the thermal dissipation commonly seen in traditional linear chargers. When powered as a linear charger, the FP6908 charges a battery in the popular constant current (CC) and constant voltage (CV) profile. The constant charge current ISET is programmable up to 1.0A with an external resistor. The charge voltage VCH has 1% accuracy over the entire recommended operating condition range. If the battery voltage is below the minimum fast charge voltage VMIN threshold, the charger always preconditions the battery with 1/10 of the programmed current at the beginning of a charge cycle, until the battery voltage is verified to be above the VMIN. This low current charge mode is named trickle mode. A thermal-fold-back feature is designed to throttle back the charge current to remove the thermal concern typically seen in linear chargers. When the battery voltage drops below a recharge threshold, the charger automatically re-charges the battery.

Applications

• Smart Handheld Devices
• Portable Instruments
• True Wireless Stereo (TWS)
• E-cigarette
• Toys

Key features

• The FP6908 is a single-cell Li-ion/Li-polymer battery charger IC which can be operated with an input voltage as low as 3.9V.
• The FP6908 can work with various types of AC adapters.
• The FP6908 can also be operated as a linear charger when the AC adapter is a voltage source.
• The battery is charged in a CC/CV (constant current/constant voltage) profile.
• The charge current is programmable with an external resistor up to 1.0A with SOP-8 (Exposed Pad), TDFN-8 (2mmx2mm) packages and 500mA with SOT-23-5 packages.
• The FP6908 can also work with a current-limited adapter to minimize the thermal dissipation.
• The FP6908 is designed with charge current thermal fold-back function to guarantee safe operation when the printed circuit board is space limited for thermal dissipation.
• A negative temperature coefficient (NTC) thermistor is connected between the NTC and GND to monitor the battery or ambient temperature.
• Input Surge Up to 30V
• No External Blocking Diode Required
• Complete Charger for Single-Cell Li-ion Batteries
• Support 4.2V or 4.35V Charge Voltage
• 1% Charge Voltage Accuracy Input Over-Voltage Protection
• Programmable Charge Current 1A for SOP-8 (Exposed Pad) and TDFN-8 (2mmx2mm) Packages 500mA for SOT-23-5 Package
• Charge Current Thermal Fold-back
• Can Operate at 3.9V After Start Up
• NTC Interface
• Less than 1μA Leakage Current off the Battery when No Input Power Attached or Charger Disabled
• SOP-8 (Exposed Pad), TDFN-8 (2mmx2mm) and SOT-23-5 Packages