The BQ2409x series of devices are highly integrated Li-ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
The BQ2409x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10-hour safety timer.
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 an 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 pre-charge current and termination current threshold are programmed via an external resistor. The fast charge current value is also programmable via an external resistor.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | BQ2409x 1-A, Single-Input, Single-Cell Li-Ion and Li-Pol Battery Chargers datasheet (Rev. H) | 27 Apr 2021 | |
| Technical article | When to use rechargeable batteries in small battery applications | 01 Oct 2019 | ||
| More literature | BQ2404x, BQ2405x, and BQ2409x Frequently Asked Questions | 25 Feb 2019 | ||
| Technical article | Should I use a linear charger or a switching charger? | 31 Oct 2015 | ||
| Technical article | Summertime and the livin' is easy | 20 Jun 2014 | ||
| More literature | Building your own Battery Simulator | 14 Oct 2013 | ||
| User guide | 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger . | 31 Dec 2012 | ||
| More literature | Selecting the Best bq2404x/5x/9x Single Cell Battery Charger for your Applicatio | 29 Nov 2012 | ||
| User guide | 1.0-A Single-Input, Single-Cell Li-Ion Battery Charger (Rev. A) | 07 Jun 2010 |
For additional terms or required resources, click any title below to view the detail page where available.
The user’s guide for BQ24091EVM describes the bq24091 evaluation module (EVM), how to perform a stand-alone evaluation or interface with a host or system. The charger is designed to deliver up to 1000mA of continuous current to the battery output when programmed with a resistor on the ISET (...)
| Package | Pins | Download |
|---|---|---|
| HVSSOP (DGQ) | 10 | View options |
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