The bq24079QW-Q1 is an integrated Li-ion linear charger and system power-path management device targeted at space-constraint automotive applications such as telematics/eCall. The device can operate from 4.35 V to 6.4 V and support charge currents up to 1.5 A. The input voltage range with input overvoltage protection supports unregulated adapters. The USB input current limit accuracy and start up sequence allow the bq24079QW-Q1 to meet the USB-IF inrush current specification. Additionally, the input dynamic power management (VIN-DPM) prevents the system load from crashing incorrectly configured USB sources.

The bq24079QW-Q1 features dynamic power-path management (DPPM) that powers the system while simultaneously and independently charging the battery. The DPPM circuit reduces the charge current when the input current limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while monitoring the charge current separately. This feature along with the 4.1-V battery regulation voltage helps to extend battery life time by reducing the number of charge and discharge cycles on the battery, allowing for proper charge termination and enabling the system to run with a defective or absent battery pack.

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally discharged battery. The power-path management architecture also permits the battery to supplement the system current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller adapter.Read more