General Description
The XC6801 series is a constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries.
The XC6801 includes a reference voltage source, battery voltage monitor, driver transistor, constant-current/constant-voltage charge circuit, overheat protection circuit and phase compensation circuit.
The battery charge termination voltage is internally set to 4.2V ±0.7% and the trickle charge voltage and accuracy is 2.9V ±3%.
In trickle charge mode, a safe battery charge is possible because approximately only 1/10 of the full charge current is supplied to the battery.
As it is possible to select a highly accurate charge current of either 100mA (MAX.) for L level input to the LIM pin or 500mA (MAX.) for H level, the series is ideal for applications where the charge is from USB.
The series charge status output pin, /CHG pin, is capable of checking the IC’s charging state via connection to an external LED.
Features
- Operating Voltage: 4.25˜6.0V
- Charge Current(externally set): 100mA (MAX.) @ LIM pin=LLIM, 500mA (MAX.) @ LIM pin=H
- Charge Termination Voltage: 4.2V±0.7%
- Trickle Charge Voltage: 2.9V±3%
- Supply Current (Stand-by):12µA (TYP.)
- Package: SOT-89-5, SOT-25, USP-6C
- Other Functions: Constant-current/constant-voltage operation with thermal shutdown, Automatic recharge, Charge status output pin, Soft-start function (Inrush limit current)
Applications
- USB charge applications
- Charging docks, charging cradles
- MP3 players, portable audio players
- Cellular phones, PDAs
- Bluetooth headsets
Typical Application Circuits
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