Smart charge controller meets demands of next-gen Li-ion power banks

October 20, 2016 // By Nick Flaherty
ON Semiconductor (Phoenix, AZ) has launched a highly integrated single chip for power banks that use next generation Li-Ion batteries.

The LC709501F provides a voltage output of 5 V, 9 V and 12 V, with a maximum charge/discharge capability of up to 30 W through a simple FET selection.

The LC709501F determines what type of device is connected and automatically selects the fastest available method for charging. Advanced users can even reprogram the LC709501F to support custom charge/discharge profiles, as well as USB Type-C and PD “Policy Engine” functions.

The single-chip solution includes an integrated fuel gauge function, configurable I/O, LED drivers, I2C interface, and pre-drivers for external power MOSFETs, providing system flexibility. A design reference kit is also available. The LC709501F supports various output power levels up to 30 W by changing external MOSFETs.  

There is also an integrated USB 2.0 Full Speed host controller that supports connectivity with iOS and Android apps that enable the device to communicate with the connected smartphone and subsequently make use of its display to show information concerning the battery health and the charging process (charging time, battery life, number of charging cycles completed, etc.). The device works with the proprietary charging protocols (such as Fast Charge and Qualcomm Quick Charge) now being used by smartphone manufacturers to accelerate the charging period.

To ensure operational longevity, over-current, over-voltage, and redundant battery protection mechanisms are all included, as well as a thermistor for monitoring of temperature levels. The LC709501F supports an operational temperature range of -40 °C to +85 °C.