750mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC with Thermal Regulation 10-VSON 0 to 125# BQ24086DRCR Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BQ24086DRCR is a highly integrated single-cell Li-ion and Li-polymer battery charger IC with power path management, designed for space-constrained portable applications. Key use cases include:
- Portable Medical Devices : Insulin pumps, portable monitors, and wearable health trackers requiring reliable battery charging with thermal regulation
- Consumer Electronics : Smartphones, tablets, and portable gaming devices needing simultaneous power delivery to system and battery charging
- IoT Devices : Smart home sensors, wearable technology, and industrial IoT nodes requiring compact charging solutions
- Portable Industrial Equipment : Handheld scanners, measurement instruments, and data loggers operating in various environmental conditions
### Industry Applications
- Healthcare : Medical monitoring equipment where battery safety and reliability are critical
- Consumer Electronics : Mass-market portable devices requiring cost-effective charging solutions
- Industrial Automation : Rugged portable equipment needing robust charging capabilities
- Wearable Technology : Fitness trackers and smartwatches with limited PCB space
### Practical Advantages and Limitations
Advantages:
- Integrated Power Path Management : Enables simultaneous system operation and battery charging
- Compact Package : 2mm × 2mm SON-10 package ideal for space-constrained designs
- High Efficiency : Up to 92% efficiency with 1.5A charging capability
- Thermal Regulation : Automatic charge current reduction during high temperature conditions
- Wide Input Voltage Range : 3.9V to 6.5V input operating range
Limitations:
- Single-Cell Only : Limited to single-cell Li-ion/Li-polymer batteries (3.5V to 4.44V)
- Maximum 1.5A Charge Current : Not suitable for high-capacity batteries requiring faster charging
- No Wireless Charging Support : Requires wired charging input
- Temperature Monitoring : Requires external NTC thermistor for optimal thermal management
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Thermal Management
- Problem : Overheating during high-current charging leading to thermal shutdown
- Solution : Implement proper PCB thermal vias, ensure adequate copper pour, and consider external heatsinking for high ambient temperatures
Pitfall 2: Input Voltage Transients
- Problem : Damage from voltage spikes exceeding absolute maximum ratings
- Solution : Include TVS diodes on input lines and ensure proper input capacitor selection
Pitfall 3: Battery Connection Issues
- Problem : Intermittent battery connections causing charging faults
- Solution : Use robust battery connectors and implement proper strain relief
### Compatibility Issues with Other Components
Power Management ICs:
- Ensure compatibility with downstream DC-DC converters and LDOs
- Verify system load sharing capabilities with other power sources
Microcontrollers:
- I²C communication requires proper pull-up resistors (1kΩ to 10kΩ recommended)
- Ensure GPIO voltage levels are compatible with charger control pins
Battery Protection Circuits:
- Compatible with standard battery protection ICs but requires careful sequencing
- Ensure protection IC doesn't interfere with charger termination algorithms
### PCB Layout Recommendations
Power Path Layout:
- Place input capacitors (C1, C2) as close as possible to IN and GND pins
- Use wide traces for BAT and SYS pins (minimum 40 mil width for 1.5A current)
- Implement ground plane for improved thermal performance and noise immunity
Thermal Management:
- Use thermal vias under the exposed thermal pad (0.3mm diameter recommended)
- Connect thermal pad to large copper area on PCB
- Maintain minimum 2oz copper weight for power traces
Signal Integrity:
