The bq2423x series of devices are highly 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 ac adapter and support charge currents between 25 mA and 500 mA. The high-input-voltage range with input overvoltage protection supports low-cost, unregulated adapters. The USB input current limit accuracy and start-up sequence allow the bq2423x to meet USB-IF inrush current specification. Additionally, the input dynamic power management (VIN-DPM) prevents the charger from crashing poorly designed or incorrectly configured USB sources.
The bq2423x 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, this enables instant system turn-on 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.
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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | bq2423x USB-Friendly Lithium-Ion Battery Charger And Power-Path Management IC datasheet (Rev. J) | PDF | HTML | 08 Apr 2017 |
| Application note | Configuring Standalone Linear Power Path Chargers (Rev. A) | PDF | HTML | 06 Apr 2020 | |
| Application note | BQ2423X external NTC control reference design | 22 Mar 2019 | ||
| Application note | Dynamic Power-Path Mgmt & Dynamic Power Mgmt (Rev. A) | 01 May 2018 | ||
| User guide | bq24072/3/4/5/9(T) and bq24230/2 1.5-A Single-Chip Li-Ion (Rev. E) | 03 Jan 2017 | ||
| Analog Design Journal | Battery-charging considerations for low-power applications | 26 Apr 2016 | ||
| Product overview | Battery Management Solutions for Wearable and Fitness Devices (Rev. C) | 18 Aug 2014 | ||
| More literature | Adapting Qi-compliant wireless-power solutions to low-power wearable products | 06 Jun 2014 | ||
| Application note | Selecting the Best bq2407x/23x Single Cell Battery Charger for your Application | 08 Nov 2012 |
For additional terms or required resources, click any title below to view the detail page where available.
This user’s guide describes the bq24072/3/4/5 and bq24320/2 (bqTiny-III™) evaluation module (EVM). The EVM provides a convenient method for evaluating the performance of a charge management and system power solution for portable applications using the bq24072/3/4/5 and bq24320/2 product (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |
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