Li-ion battery charger features 9mm? footprint

Linear Technology Corp. has introduced the LTC4058, a linear 1-cell Li-ion battery charger that requires no external power components and operates independent of firmware for battery monitoring, charge termination and protection.

Suitable for digital still cameras, portable POS and diagnostic equipment, the product includes three pins for reporting the value of charge current used for gas gauging, the presence of input power supply, and charge status.

The LTC4058 charges single-cell 4.2V Li-Ion batteries from 4.25V to 6.5V input sources in two operating modes - constant-current and constant-voltage. It terminates the charging process during constant-voltage mode when the charge current decreases to one-tenth the value of the fast charge current. By eliminating the need for a sense resistor, the designer can adjust the fast charge current with an inexpensive programming resistor and still obtain ±5 percent charge accuracy.

Rated for operation between the -40°C and 85°C temperature range, the charger includes protection features such as overvoltage, soft-start, overheating and reverse current protection, as well as battery care features such as pre-conditioning and automatic recharge. Pricing for 1,000-piece quantities begins at $1.70 each.