I2C controlled single cell 3A USB charger with NVDC Power Path and adjustable voltageUSB OTG
Product details
Parameters
Package | Pins | Size
Features
- 90% High Efficiency Switch Mode 3-A Charger
- 3.9-V to 6.2-V Single Input USB-Compliant Charger with 6.4-V Over-Voltage Protection
- Input voltage and current limit supports USB 2.0 and USB 3.0
- Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A, and 3 A
- USB OTG with Adjustable output 4.55 V to 5.5 V at 1 A or 1.5 A
- Fast OTG Startup (22 ms Typ)
- 90% 5-V Boost Mode Efficiency
- Accurate ±15% Hiccup Mode Overcurrent Protection
- Narrow VDC (NVDC) Power Path Management
- Instant System On with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode
- 1.5-MHz Switching Frequency for Low Profile 1.2-mm Inductor
- I2C port for optimal system performance and status reporting
- Autonomous Battery Charging with or without Host Management
- Battery Charge Enable
- Battery Charge Preconditioning
- Charge Termination and Recharge
- High Accuracy
- ±0.5% Charge Voltage Regulation
- ±7% Charge Current Regulation
- ±7.5% Input Current Regulation
- ±3% Output Voltage Regulation in USB OTG Boost Mode
- High Integration
- Power Path Management
- Synchronous Switching MOSFETs
- Integrated Current Sensing
- Bootstrap Diode
- Internal Loop Compensation
- Safety
- Battery Temperature Sensing for Charging and Discharging in OTG Mode
- Battery Charging Safety Timer
- Thermal Regulation and Thermal Shutdown
- Input and System Over-Voltage Protection
- MOSFET Over-Current Protection
- Charge Status Outputs for LED or Host Processor
- Maximum power tracking capability by input voltage regulation
- 20-µA Low Battery Leakage Current and Support Shipping Mode and System Reset
- I2C Forced BATFET Off with Delay (9 s Typ)
- 4.00-mm × 4.00-mm WQFN-24 Package
Description
The bq24298 is a highly-integrated switch-mode battery charge management and system power path management device for 1 cell Li-Ion and Li-polymer battery in a wide range of smart phone and tablet 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 device supports USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the bq24298 takes the result from the detection circuit in the system, such as USB PHY device. The device also supports USB On-the-Go operation by providing fast startup and supplying adjustable voltage 4.55 – 5.5V (default 5V) on the VBUS with an accurate current limit up to 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 keeps operating even when the battery is completely depleted or removed. When the input source current or voltage limit is reached, the power path management automatically reduces the charge current to zero and then starts discharges the battery until the system power requirement is met. This supplement mode operation keeps the input source from getting overloaded.
The device initiates and completes a charging cycle when host control is not available. It automatically charges the battery in three phases: pre-conditioning, constant current and constant voltage. In the end, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. Later on, when the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle.
The charge device provides 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 host when fault occurs.
The bq24298 is available in a 24-pin, 4.00-mm × 4.00-mm thin WQFN package.
Technical documentation
Type | Title | Date | |
---|---|---|---|
* | Datasheet | bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG datasheet (Rev. A) | Dec. 30, 2016 |
Technical articles | When to use rechargeable batteries in small battery applications | Oct. 01, 2019 | |
Technical articles | Should I use a linear charger or a switching charger? | Oct. 30, 2015 | |
User guide | bq24296M and bq24298 EVM (PWR655) (Rev. A) | Mar. 31, 2015 | |
Technical articles | Summertime and the livin' is easy | Jun. 20, 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The bq24298 evaluation module (EVM) is a complete charger module for evaluating the highly-integrated switch-mode battery charge management and system power path management device for 1 cell Li-Ion and Li-polymer battery in a wide range of smartphone and tablet applications.
Features
- Input voltage range: 3.9V to 6.2V
- 2C Communication
- LED indication for status signals
- Test points for key signals available for testing purposes
- Jumpers for different circuit configuration
Software development
Features
- Real-time Gauge Dashboard for monitoring basic registers
- Full register access and logging
- Full data memory access and logging
- Product configuration and monitoring tools
- Import and export of product configurations
- Calibration and test automation
- Export of FS files for the target production environment
Reference designs
Design files
-
download TIDA-00591 Gerber.zip (444KB) -
download TIDA-00591 BOM.pdf (87KB) -
download TIDA-00591 Assembly Drawing.pdf (249KB) -
download TIDA-00591 PCB.pdf (2166KB) -
download TIDA-00591 CAD Files.zip (183KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
WQFN (RTW) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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