All trademarks are the property of their respective owners.
DescriptionThe BQ2407xT series of devices are integrated Li-ion linear chargers and system powerpath management devices targeted at space-limited portable applications. The devices operate fromeither a USB port or AC adapter and support charge currents up to 1.5A. The input voltage rangewith input over-voltage protection supports unregulated adapters. The USB input current limitaccuracy and start up sequence allow the BQ2407xT to meet USB-IF inrush current specification.Additionally, the input dynamic power management (VIN - DPM) prevents thecharger from crashing incorrectly configure USB sources.
The BQ2407xT features dynamic power path management (DPPM) that powers the system whilesimultaneously and independently charging the battery. The DPPM circuit reduces the charge currentwhen 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 featurereduces the number of charge and discharge cycles on the battery, allows for proper chargetermination and enables the system to run with a defective or absent battery pack.
Additionally, the regulated system input enables instant system turn-on when plugged ineven with a totally discharged battery. The power-path management architecture also permits thebattery to supplement the system current requirements when the adapter cannot deliver the peaksystem currents, enabling the use of a smaller adapter.
The battery is charged in three phases: conditioning, constant current, and constantvoltage. In all charge phases, an internal control loop monitors the IC junction temperature andreduces the charge current if the internal temperature threshold is exceeded. The charger powerstage and charge current sense functions are fully integrated. The charger function has highaccuracy current and voltage regulation loops, charge status display, and charge termination. Theinput current limit and charge current are programmable using external resistors.
Feature
- Fully Compliant USB Charger
- Selectable 100 mA and 500 mA maximum input current
- 100 mA Maximum current limit ensures compliance to USB-IF standard
- Input based dynamic power management (VIN-DPM) forprotection against poor USB sources
- 28 V Input lting with over-voltage protection
- Integrated dynamic power path management (DPPM) function simultaneously andindependently powers the system and charges the battery
- System output tracks battery voltage (BQ24072T)
- Supports up to 1.5 A charge current with current monitoring output(ISET)
- Programmable Input Current Limit up to 1.5 A for wall adapters
- Battery disconnect function with SYSOFF input
- Reverse current, short-circuit and thermal protection
- Flexible voltage based NTC thermistor input
- Proprietary start up sequence limits inrush current
- Status indication – charging/done, power good
- Small 3 mm × 3 mm 16 Lead VQFN Package
All trademarks are the property of their respective owners.
DescriptionThe BQ2407xT series of devices are integrated Li-ion linear chargers and system powerpath management devices targeted at space-limited portable applications. The devices operate fromeither a USB port or AC adapter and support charge currents up to 1.5A. The input voltage rangewith input over-voltage protection supports unregulated adapters. The USB input current limitaccuracy and start up sequence allow the BQ2407xT to meet USB-IF inrush current specification.Additionally, the input dynamic power management (VIN - DPM) prevents thecharger from crashing incorrectly configure USB sources.
The BQ2407xT features dynamic power path management (DPPM) that powers the system whilesimultaneously and independently charging the battery. The DPPM circuit reduces the charge currentwhen 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 featurereduces the number of charge and discharge cycles on the battery, allows for proper chargetermination and enables the system to run with a defective or absent battery pack.
Additionally, the regulated system input enables instant system turn-on when plugged ineven with a totally discharged battery. The power-path management architecture also permits thebattery to supplement the system current requirements when the adapter cannot deliver the peaksystem currents, enabling the use of a smaller adapter.
The battery is charged in three phases: conditioning, constant current, and constantvoltage. In all charge phases, an internal control loop monitors the IC junction temperature andreduces the charge current if the internal temperature threshold is exceeded. The charger powerstage and charge current sense functions are fully integrated. The charger function has highaccuracy current and voltage regulation loops, charge status display, and charge termination. Theinput current limit and charge current are programmable using external resistors.
