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BQ24073 Datasheet PDF

Part Series:BQ24073 Series
Description:USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, Vout 4.4Vy
Document:BQ24073RGTR Datasheet PDF (51 Pages)

BQ24073 Datasheet PDF

51 Pages
TI
USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, Vout 4.4Vy
51 Pages
TI
USB-Friendly Li-Ion Battery Charger and Power-Path Management IC, Vout 4.4V 16-QFN -40℃ to 85℃

BQ24073 - TI Specifications

TYPE
DESCRIPTION
Mounting Style
Surface Mount
Case/Package
QFN-16
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BQ24073 - TI Function Overview

The bq2407x series of devices are integrated Li-Ion linear chargers and system power path management devices targeted at space-limited portable applications. The devices operate from either a USB port or an AC adapter 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 bq2407x to meet USB-IF inrush current specifications. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing incorrectly configured USB sources.
The bq2407x 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 reduces the number of charge and discharge cycles on the battery, allows for proper charge termination 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 in even with a totally discharged battery. The power-path management architecture also lets the battery supplement the system current requirements when the adapter cannot deliver the peak system currents, thus enabling the use of a smaller adapter.
The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The input current limit and charge current are programmable using external resistors.
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) for Protection Against Poor USB
Sources
28-V Input Rating with Overvoltage Protection
Integrated Dynamic Power Path Management
(DPPM) Function Simultaneously and
Independently Powers the System and Charges
the Battery
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
System Output Tracks Battery Voltage (bq24072)
Programmable Termination Current (bq24074)
Battery Disconnect Function with SYSOFF Input
(bq24075, bq24079)
Programmable Pre-Charge and Fast-Charge
Safety Timers
Reverse Current, Short-Circuit and Thermal
Protection
NTC Thermistor Input
Proprietary Start-up Sequence Limits Inrush
Current
Status Indication – Charging/Done, Power Good
APPLICATIONS
Smart Phones
Portable Media Players
Portable Navigation Devices
Low-Power Handheld Devices
All other trademarks are the property of their respective owners
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