■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 Range : 4.25V ~ 6.0V

Charge Current (externally set) : 100mA (MAX.) @ LIM pin=L

500mA (MAX.) @ LIM pin=H

Charge Termination Voltage : 4.2V ±0.7

Trickle Charge Voltage : 2.9V ±3

Supply Current (Stand-by) : 12μA (TYP.)

Packages : SOT-89-5, SOT-25, USP-6C

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