The bq24295 is a highly-integrated switch-mode battery charge management and system power path management devices for 1 cell Li-Ion and Li-polymer battery in a wide range of power bank, tablet and other portable device applications.
Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.
The device supports 3.9V – 6.2V USB input sources, including standard USB host port and USB charging port with 6.4V over-voltage protection. The bq24295 is compliant with USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the bq24295 detects the input source through D+/D– detection following the USB battery charging spec 1.2. In addition, the bq24295 detects non-standard 2A/1A adapters. The bq24295 supports battery boost operation by supplying adjustable voltage 4.55 – 5.5V (default 5.1V) on PMID pin with minimum current of 1.5A.
The power path management regulates the system slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable). With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management automatically reduces the charge current to zero. As the system load continues to increase, the power path discharges the battery until the system power requirement is met. This supplement mode operation prevents overloading the input source.
The devices initiate and complete a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle.
The devices provide various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable).
The STAT output reports the charging status and any fault conditions. The INT immediately notifies the host when a fault occurs.
The bq24295 is available in a 24-pin, 4×4 mm2 thin VQFN package.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | bq24295 I2C Controlled 3A Single Cell USB Charger With Narrow VDC 4.5-5.5V Adjustable Voltage at 1.5A Synchronous Boost Operation datasheet (Rev. B) | PDF | HTML | 30 Dec 2016 |
| Application note | Selection of Single-Cell Buck Narrow VDC Switching Battery Chargers | PDF | HTML | 10 Nov 2022 | |
| Application note | USB D+/D- Input Current Limit Detection | PDF | HTML | 30 Dec 2020 | |
| Technical article | When to use rechargeable batteries in small battery applications | 01 Oct 2019 | ||
| Technical article | Learn the basics of battery charging in power banks | 04 May 2016 | ||
| Technical article | Should I use a linear charger or a switching charger? | 31 Oct 2015 | ||
| Technical article | Eliminate battery anxiety with portable power in your pocket | 05 Sep 2015 | ||
| Analog Design Journal | Extract maximum power from the supply when charging a battery | 11 Apr 2014 | ||
| EVM User's guide | bq24295EVM-549 (PWR549) User's Guide (Rev. B) | 03 Apr 2014 |
For additional terms or required resources, click any title below to view the detail page where available.
I2C Controlled 2.5A Single Cell Charger with Narrow VDC Power Path Management and USB OTG, 5V and 1.5 ADC maximum
The BQ24295EVM requires USB Interface Adaptive Evaluation Module “USB-TO-GPIO” for I2C interface. If one is not already available to you and I2C is needed then one can be (...)
| Package | Pins | Download |
|---|---|---|
| VQFN (RGE) | 24 | View options |
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