bqTINY(TM) Linear, 1-cell (4.2V) Li-Ion Charger w/ 1-A FET, AC Present and Temp. Sense in QFN/MLP-10# BQ24010DRCRG4 Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BQ24010DRCRG4 is a highly integrated single-chip Li-ion and Li-polymer battery charge management IC designed for space-limited portable applications. Typical use cases include:
Portable Medical Devices
- Wearable health monitors and fitness trackers
- Portable diagnostic equipment
- Medical patches and disposable sensors
- The device's small form factor (3mm × 3mm QFN) enables compact designs essential for wearable medical applications
Consumer Electronics
- Bluetooth headsets and wireless earbuds
- Smartwatches and fitness bands
- Portable speakers and gaming accessories
- Handheld GPS devices and digital cameras
Industrial Applications
- Portable data loggers and measurement instruments
- Wireless sensor nodes and IoT devices
- Handheld scanners and barcode readers
- Remote monitoring equipment
### Industry Applications
Medical Industry : Used in FDA Class II devices where reliable battery charging is critical for patient monitoring
Consumer Electronics : Mass-market portable devices requiring cost-effective charging solutions
Industrial IoT : Deployed in edge devices requiring autonomous operation with minimal maintenance
Automotive Accessories : Aftermarket car accessories and portable navigation systems
### Practical Advantages
Space Efficiency : Integrated power FETs and current sensor eliminate external components
Thermal Performance : Advanced thermal regulation extends battery life
Safety Compliance : Meets JEITA guidelines for temperature monitoring
Flexible Power Sources : Supports USB and adapter inputs with automatic detection
Limitations
- Maximum input voltage of 6.5V limits use in automotive applications
- 800mA maximum charge current may be insufficient for high-capacity batteries
- No support for newer battery chemistries beyond Li-ion/Li-polymer
- Limited to single-cell battery configurations
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Thermal Management Issues
*Pitfall*: Inadequate thermal dissipation causing premature thermal shutdown
*Solution*: Ensure proper thermal vias under the package and adequate copper area
Input Capacitor Selection
*Pitfall*: Using capacitors with insufficient voltage rating or high ESR
*Solution*: Use 10μF, 10V X5R or X7R ceramic capacitor placed within 2mm of IN pin
Battery Connection Problems
*Pitfall*: Long battery traces causing voltage sensing inaccuracies
*Solution*: Route battery sense lines directly to battery terminals with Kelvin connection
### Compatibility Issues
Microcontroller Interfaces
- Compatible with 1.8V and 3.3V logic levels
- STAT and PG outputs require pull-up resistors for open-drain operation
- May require level shifting when interfacing with 5V systems
Power Source Selection
- Automatic detection between USB (500mA max) and wall adapter (800mA max) modes
- Conflicts may arise when multiple power sources are connected simultaneously
Battery Protection Circuits
- Compatible with most commercial battery protection ICs
- Ensure protection IC doesn't interfere with charge termination detection
### PCB Layout Recommendations
Power Routing
- Use at least 20mil traces for VBAT and VIN connections
- Place input and output capacitors as close as possible to respective pins
- Implement star grounding at the IC's GND pin
Thermal Management
- Use 4×4 array of 8mil thermal vias under the exposed thermal pad
- Connect thermal pad to large ground plane for heat dissipation
- Maintain minimum 2oz copper weight for power layers
Signal Integrity
- Keep sensitive analog traces (TS, ISET) away from switching nodes
- Route STAT and PG signals with controlled impedance
- Implement proper filtering on TS pin to prevent false temperature shutdown
## 3. Technical Specifications
### Key Parameter Explanations
